/* $NetBSD: job.c,v 1.156 2011/03/31 06:28:42 sjg Exp $ */ /* * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Adam de Boor. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1988, 1989 by Adam de Boor * Copyright (c) 1989 by Berkeley Softworks * All rights reserved. * * This code is derived from software contributed to Berkeley by * Adam de Boor. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef MAKE_NATIVE static char rcsid[] = "$NetBSD: job.c,v 1.156 2011/03/31 06:28:42 sjg Exp $"; #else #include #ifndef lint #if 0 static char sccsid[] = "@(#)job.c 8.2 (Berkeley) 3/19/94"; #else __RCSID("$NetBSD: job.c,v 1.156 2011/03/31 06:28:42 sjg Exp $"); #endif #endif /* not lint */ #endif /*- * job.c -- * handle the creation etc. of our child processes. * * Interface: * Job_Make Start the creation of the given target. * * Job_CatchChildren Check for and handle the termination of any * children. This must be called reasonably * frequently to keep the whole make going at * a decent clip, since job table entries aren't * removed until their process is caught this way. * * Job_CatchOutput Print any output our children have produced. * Should also be called fairly frequently to * keep the user informed of what's going on. * If no output is waiting, it will block for * a time given by the SEL_* constants, below, * or until output is ready. * * Job_Init Called to intialize this module. in addition, * any commands attached to the .BEGIN target * are executed before this function returns. * Hence, the makefile must have been parsed * before this function is called. * * Job_End Cleanup any memory used. * * Job_ParseShell Given the line following a .SHELL target, parse * the line as a shell specification. Returns * FAILURE if the spec was incorrect. * * Job_Finish Perform any final processing which needs doing. * This includes the execution of any commands * which have been/were attached to the .END * target. It should only be called when the * job table is empty. * * Job_AbortAll Abort all currently running jobs. It doesn't * handle output or do anything for the jobs, * just kills them. It should only be called in * an emergency, as it were. * * Job_CheckCommands Verify that the commands for a target are * ok. Provide them if necessary and possible. * * Job_Touch Update a target without really updating it. * * Job_Wait Wait for all currently-running jobs to finish. */ #include #include #include #include #include #include #include #ifndef USE_SELECT #include #endif #include #include #include #include #include "make.h" #include "hash.h" #include "dir.h" #include "job.h" #include "pathnames.h" #include "trace.h" # define STATIC static /* * error handling variables */ static int errors = 0; /* number of errors reported */ static int aborting = 0; /* why is the make aborting? */ #define ABORT_ERROR 1 /* Because of an error */ #define ABORT_INTERRUPT 2 /* Because it was interrupted */ #define ABORT_WAIT 3 /* Waiting for jobs to finish */ #define JOB_TOKENS "+EI+" /* Token to requeue for each abort state */ /* * this tracks the number of tokens currently "out" to build jobs. */ int jobTokensRunning = 0; int not_parallel = 0; /* set if .NOT_PARALLEL */ /* * XXX: Avoid SunOS bug... FILENO() is fp->_file, and file * is a char! So when we go above 127 we turn negative! */ #define FILENO(a) ((unsigned) fileno(a)) /* * post-make command processing. The node postCommands is really just the * .END target but we keep it around to avoid having to search for it * all the time. */ static GNode *postCommands = NULL; /* node containing commands to execute when * everything else is done */ static int numCommands; /* The number of commands actually printed * for a target. Should this number be * 0, no shell will be executed. */ /* * Return values from JobStart. */ #define JOB_RUNNING 0 /* Job is running */ #define JOB_ERROR 1 /* Error in starting the job */ #define JOB_FINISHED 2 /* The job is already finished */ /* * Descriptions for various shells. * * The build environment may set DEFSHELL_INDEX to one of * DEFSHELL_INDEX_SH, DEFSHELL_INDEX_KSH, or DEFSHELL_INDEX_CSH, to * select one of the prefedined shells as the default shell. * * Alternatively, the build environment may set DEFSHELL_CUSTOM to the * name or the full path of a sh-compatible shell, which will be used as * the default shell. * * ".SHELL" lines in Makefiles can choose the default shell from the # set defined here, or add additional shells. */ #ifdef DEFSHELL_CUSTOM #define DEFSHELL_INDEX_CUSTOM 0 #define DEFSHELL_INDEX_SH 1 #define DEFSHELL_INDEX_KSH 2 #define DEFSHELL_INDEX_CSH 3 #else /* !DEFSHELL_CUSTOM */ #define DEFSHELL_INDEX_SH 0 #define DEFSHELL_INDEX_KSH 1 #define DEFSHELL_INDEX_CSH 2 #endif /* !DEFSHELL_CUSTOM */ #ifndef DEFSHELL_INDEX #define DEFSHELL_INDEX 0 /* DEFSHELL_INDEX_CUSTOM or DEFSHELL_INDEX_SH */ #endif /* !DEFSHELL_INDEX */ static Shell shells[] = { #ifdef DEFSHELL_CUSTOM /* * An sh-compatible shell with a non-standard name. * * Keep this in sync with the "sh" description below, but avoid * non-portable features that might not be supplied by all * sh-compatible shells. */ { DEFSHELL_CUSTOM, FALSE, "", "", "", 0, FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', "", "", }, #endif /* DEFSHELL_CUSTOM */ /* * SH description. Echo control is also possible and, under * sun UNIX anyway, one can even control error checking. */ { "sh", FALSE, "", "", "", 0, FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', #if defined(MAKE_NATIVE) && defined(__NetBSD__) "q", #else "", #endif "", }, /* * KSH description. */ { "ksh", TRUE, "set +v", "set -v", "set +v", 6, FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', "v", "", }, /* * CSH description. The csh can do echo control by playing * with the setting of the 'echo' shell variable. Sadly, * however, it is unable to do error control nicely. */ { "csh", TRUE, "unset verbose", "set verbose", "unset verbose", 10, FALSE, "echo \"%s\"\n", "csh -c \"%s || exit 0\"\n", "", "'\\\n'", '#', "v", "e", }, /* * UNKNOWN. */ { NULL, FALSE, NULL, NULL, NULL, 0, FALSE, NULL, NULL, NULL, NULL, 0, NULL, NULL, } }; static Shell *commandShell = &shells[DEFSHELL_INDEX]; /* this is the shell to * which we pass all * commands in the Makefile. * It is set by the * Job_ParseShell function */ const char *shellPath = NULL, /* full pathname of * executable image */ *shellName = NULL; /* last component of shell */ static const char *shellArgv = NULL; /* Custom shell args */ STATIC Job *job_table; /* The structures that describe them */ STATIC Job *job_table_end; /* job_table + maxJobs */ static int wantToken; /* we want a token */ static int lurking_children = 0; static int make_suspended = 0; /* non-zero if we've seen a SIGTSTP (etc) */ /* * Set of descriptors of pipes connected to * the output channels of children */ static struct pollfd *fds = NULL; static Job **jobfds = NULL; static int nfds = 0; static void watchfd(Job *); static void clearfd(Job *); static int readyfd(Job *); STATIC GNode *lastNode; /* The node for which output was most recently * produced. */ STATIC const char *targFmt; /* Format string to use to head output from a * job when it's not the most-recent job heard * from */ static char *targPrefix = NULL; /* What we print at the start of targFmt */ static Job tokenWaitJob; /* token wait pseudo-job */ static Job childExitJob; /* child exit pseudo-job */ #define CHILD_EXIT "." #define DO_JOB_RESUME "R" #define TARG_FMT "%s %s ---\n" /* Default format */ #define MESSAGE(fp, gn) \ (void)fprintf(fp, targFmt, targPrefix, gn->name) static sigset_t caught_signals; /* Set of signals we handle */ #if defined(SYSV) #define KILLPG(pid, sig) kill(-(pid), (sig)) #else #define KILLPG(pid, sig) killpg((pid), (sig)) #endif static void JobChildSig(int); static void JobContinueSig(int); static Job *JobFindPid(int, int, Boolean); static int JobPrintCommand(void *, void *); static int JobSaveCommand(void *, void *); static void JobClose(Job *); static void JobExec(Job *, char **); static void JobMakeArgv(Job *, char **); static int JobStart(GNode *, int); static char *JobOutput(Job *, char *, char *, int); static void JobDoOutput(Job *, Boolean); static Shell *JobMatchShell(const char *); static void JobInterrupt(int, int); static void JobRestartJobs(void); static void JobTokenAdd(void); static void JobSigLock(sigset_t *); static void JobSigUnlock(sigset_t *); static void JobSigReset(void); const char *malloc_options="A"; static void job_table_dump(const char *where) { Job *job; fprintf(debug_file, "job table @ %s\n", where); for (job = job_table; job < job_table_end; job++) { fprintf(debug_file, "job %d, status %d, flags %d, pid %d\n", (int)(job - job_table), job->job_state, job->flags, job->pid); } } /* * JobSigLock/JobSigUnlock * * Signal lock routines to get exclusive access. Currently used to * protect `jobs' and `stoppedJobs' list manipulations. */ static void JobSigLock(sigset_t *omaskp) { if (sigprocmask(SIG_BLOCK, &caught_signals, omaskp) != 0) { Punt("JobSigLock: sigprocmask: %s", strerror(errno)); sigemptyset(omaskp); } } static void JobSigUnlock(sigset_t *omaskp) { (void)sigprocmask(SIG_SETMASK, omaskp, NULL); } static void JobCreatePipe(Job *job, int minfd) { int i, fd; if (pipe(job->jobPipe) == -1) Punt("Cannot create pipe: %s", strerror(errno)); /* Set close-on-exec flag for both */ (void)fcntl(job->jobPipe[0], F_SETFD, 1); (void)fcntl(job->jobPipe[1], F_SETFD, 1); /* * We mark the input side of the pipe non-blocking; we poll(2) the * pipe when we're waiting for a job token, but we might lose the * race for the token when a new one becomes available, so the read * from the pipe should not block. */ fcntl(job->jobPipe[0], F_SETFL, fcntl(job->jobPipe[0], F_GETFL, 0) | O_NONBLOCK); for (i = 0; i < 2; i++) { /* Avoid using low numbered fds */ fd = fcntl(job->jobPipe[i], F_DUPFD, minfd); if (fd != -1) { close(job->jobPipe[i]); job->jobPipe[i] = fd; } } } /*- *----------------------------------------------------------------------- * JobCondPassSig -- * Pass a signal to a job * * Input: * signop Signal to send it * * Side Effects: * None, except the job may bite it. * *----------------------------------------------------------------------- */ static void JobCondPassSig(int signo) { Job *job; if (DEBUG(JOB)) { (void)fprintf(debug_file, "JobCondPassSig(%d) called.\n", signo); } for (job = job_table; job < job_table_end; job++) { if (job->job_state != JOB_ST_RUNNING) continue; if (DEBUG(JOB)) { (void)fprintf(debug_file, "JobCondPassSig passing signal %d to child %d.\n", signo, job->pid); } KILLPG(job->pid, signo); } } /*- *----------------------------------------------------------------------- * JobChldSig -- * SIGCHLD handler. * * Input: * signo The signal number we've received * * Results: * None. * * Side Effects: * Sends a token on the child exit pipe to wake us up from * select()/poll(). * *----------------------------------------------------------------------- */ static void JobChildSig(int signo __unused) { write(childExitJob.outPipe, CHILD_EXIT, 1); } /*- *----------------------------------------------------------------------- * JobContinueSig -- * Resume all stopped jobs. * * Input: * signo The signal number we've received * * Results: * None. * * Side Effects: * Jobs start running again. * *----------------------------------------------------------------------- */ static void JobContinueSig(int signo __unused) { /* * Defer sending to SIGCONT to our stopped children until we return * from the signal handler. */ write(childExitJob.outPipe, DO_JOB_RESUME, 1); } /*- *----------------------------------------------------------------------- * JobPassSig -- * Pass a signal on to all jobs, then resend to ourselves. * * Input: * signo The signal number we've received * * Results: * None. * * Side Effects: * We die by the same signal. * *----------------------------------------------------------------------- */ static void JobPassSig_int(int signo) { /* Run .INTERRUPT target then exit */ JobInterrupt(TRUE, signo); } static void JobPassSig_term(int signo) { /* Dont run .INTERRUPT target then exit */ JobInterrupt(FALSE, signo); } static void JobPassSig_suspend(int signo) { sigset_t nmask, omask; struct sigaction act; /* Suppress job started/continued messages */ make_suspended = 1; /* Pass the signal onto every job */ JobCondPassSig(signo); /* * Send ourselves the signal now we've given the message to everyone else. * Note we block everything else possible while we're getting the signal. * This ensures that all our jobs get continued when we wake up before * we take any other signal. */ sigfillset(&nmask); sigdelset(&nmask, signo); (void)sigprocmask(SIG_SETMASK, &nmask, &omask); act.sa_handler = SIG_DFL; sigemptyset(&act.sa_mask); act.sa_flags = 0; (void)sigaction(signo, &act, NULL); if (DEBUG(JOB)) { (void)fprintf(debug_file, "JobPassSig passing signal %d to self.\n", signo); } (void)kill(getpid(), signo); /* * We've been continued. * * A whole host of signals continue to happen! * SIGCHLD for any processes that actually suspended themselves. * SIGCHLD for any processes that exited while we were alseep. * The SIGCONT that actually caused us to wakeup. * * Since we defer passing the SIGCONT on to our children until * the main processing loop, we can be sure that all the SIGCHLD * events will have happened by then - and that the waitpid() will * collect the child 'suspended' events. * For correct sequencing we just need to ensure we process the * waitpid() before passign on the SIGCONT. * * In any case nothing else is needed here. */ /* Restore handler and signal mask */ act.sa_handler = JobPassSig_suspend; (void)sigaction(signo, &act, NULL); (void)sigprocmask(SIG_SETMASK, &omask, NULL); } /*- *----------------------------------------------------------------------- * JobFindPid -- * Compare the pid of the job with the given pid and return 0 if they * are equal. This function is called from Job_CatchChildren * to find the job descriptor of the finished job. * * Input: * job job to examine * pid process id desired * * Results: * Job with matching pid * * Side Effects: * None *----------------------------------------------------------------------- */ static Job * JobFindPid(int pid, int status, Boolean isJobs) { Job *job; for (job = job_table; job < job_table_end; job++) { if ((job->job_state == status) && job->pid == pid) return job; } if (DEBUG(JOB) && isJobs) job_table_dump("no pid"); return NULL; } /*- *----------------------------------------------------------------------- * JobPrintCommand -- * Put out another command for the given job. If the command starts * with an @ or a - we process it specially. In the former case, * so long as the -s and -n flags weren't given to make, we stick * a shell-specific echoOff command in the script. In the latter, * we ignore errors for the entire job, unless the shell has error * control. * If the command is just "..." we take all future commands for this * job to be commands to be executed once the entire graph has been * made and return non-zero to signal that the end of the commands * was reached. These commands are later attached to the postCommands * node and executed by Job_End when all things are done. * This function is called from JobStart via Lst_ForEach. * * Input: * cmdp command string to print * jobp job for which to print it * * Results: * Always 0, unless the command was "..." * * Side Effects: * If the command begins with a '-' and the shell has no error control, * the JOB_IGNERR flag is set in the job descriptor. * If the command is "..." and we're not ignoring such things, * tailCmds is set to the successor node of the cmd. * numCommands is incremented if the command is actually printed. *----------------------------------------------------------------------- */ static int JobPrintCommand(void *cmdp, void *jobp) { Boolean noSpecials; /* true if we shouldn't worry about * inserting special commands into * the input stream. */ Boolean shutUp = FALSE; /* true if we put a no echo command * into the command file */ Boolean errOff = FALSE; /* true if we turned error checking * off before printing the command * and need to turn it back on */ const char *cmdTemplate; /* Template to use when printing the * command */ char *cmdStart; /* Start of expanded command */ char *escCmd = NULL; /* Command with quotes/backticks escaped */ char *cmd = (char *)cmdp; Job *job = (Job *)jobp; char *cp, *tmp; int i, j; noSpecials = NoExecute(job->node); if (strcmp(cmd, "...") == 0) { job->node->type |= OP_SAVE_CMDS; if ((job->flags & JOB_IGNDOTS) == 0) { job->tailCmds = Lst_Succ(Lst_Member(job->node->commands, cmd)); return 1; } return 0; } #define DBPRINTF(fmt, arg) if (DEBUG(JOB)) { \ (void)fprintf(debug_file, fmt, arg); \ } \ (void)fprintf(job->cmdFILE, fmt, arg); \ (void)fflush(job->cmdFILE); numCommands += 1; cmdStart = cmd = Var_Subst(NULL, cmd, job->node, FALSE); cmdTemplate = "%s\n"; /* * Check for leading @' and -'s to control echoing and error checking. */ while (*cmd == '@' || *cmd == '-' || (*cmd == '+')) { switch (*cmd) { case '@': shutUp = DEBUG(LOUD) ? FALSE : TRUE; break; case '-': job->flags |= JOB_IGNERR; errOff = TRUE; break; case '+': if (noSpecials) { /* * We're not actually executing anything... * but this one needs to be - use compat mode just for it. */ CompatRunCommand(cmdp, job->node); return 0; } break; } cmd++; } while (isspace((unsigned char) *cmd)) cmd++; /* * If the shell doesn't have error control the alternate echo'ing will * be done (to avoid showing additional error checking code) * and this will need the characters '$ ` \ "' escaped */ if (!commandShell->hasErrCtl) { /* Worst that could happen is every char needs escaping. */ escCmd = bmake_malloc((strlen(cmd) * 2) + 1); for (i = 0, j= 0; cmd[i] != '\0'; i++, j++) { if (cmd[i] == '$' || cmd[i] == '`' || cmd[i] == '\\' || cmd[i] == '"') escCmd[j++] = '\\'; escCmd[j] = cmd[i]; } escCmd[j] = 0; } if (shutUp) { if (!(job->flags & JOB_SILENT) && !noSpecials && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); } else { if (commandShell->hasErrCtl) shutUp = FALSE; } } if (errOff) { if (!noSpecials) { if (commandShell->hasErrCtl) { /* * we don't want the error-control commands showing * up either, so we turn off echoing while executing * them. We could put another field in the shell * structure to tell JobDoOutput to look for this * string too, but why make it any more complex than * it already is? */ if (!(job->flags & JOB_SILENT) && !shutUp && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); DBPRINTF("%s\n", commandShell->ignErr); DBPRINTF("%s\n", commandShell->echoOn); } else { DBPRINTF("%s\n", commandShell->ignErr); } } else if (commandShell->ignErr && (*commandShell->ignErr != '\0')) { /* * The shell has no error control, so we need to be * weird to get it to ignore any errors from the command. * If echoing is turned on, we turn it off and use the * errCheck template to echo the command. Leave echoing * off so the user doesn't see the weirdness we go through * to ignore errors. Set cmdTemplate to use the weirdness * instead of the simple "%s\n" template. */ if (!(job->flags & JOB_SILENT) && !shutUp) { if (commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); } DBPRINTF(commandShell->errCheck, escCmd); shutUp = TRUE; } else { if (!shutUp) { DBPRINTF(commandShell->errCheck, escCmd); } } cmdTemplate = commandShell->ignErr; /* * The error ignoration (hee hee) is already taken care * of by the ignErr template, so pretend error checking * is still on. */ errOff = FALSE; } else { errOff = FALSE; } } else { errOff = FALSE; } } else { /* * If errors are being checked and the shell doesn't have error control * but does supply an errOut template, then setup commands to run * through it. */ if (!commandShell->hasErrCtl && commandShell->errOut && (*commandShell->errOut != '\0')) { if (!(job->flags & JOB_SILENT) && !shutUp) { if (commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); } DBPRINTF(commandShell->errCheck, escCmd); shutUp = TRUE; } /* If it's a comment line or blank, treat as an ignored error */ if ((escCmd[0] == commandShell->commentChar) || (escCmd[0] == 0)) cmdTemplate = commandShell->ignErr; else cmdTemplate = commandShell->errOut; errOff = FALSE; } } if (DEBUG(SHELL) && strcmp(shellName, "sh") == 0 && (job->flags & JOB_TRACED) == 0) { DBPRINTF("set -%s\n", "x"); job->flags |= JOB_TRACED; } if ((cp = Check_Cwd_Cmd(cmd)) != NULL) { DBPRINTF("test -d %s && ", cp); DBPRINTF("cd %s\n", cp); } DBPRINTF(cmdTemplate, cmd); free(cmdStart); if (escCmd) free(escCmd); if (errOff) { /* * If echoing is already off, there's no point in issuing the * echoOff command. Otherwise we issue it and pretend it was on * for the whole command... */ if (!shutUp && !(job->flags & JOB_SILENT) && commandShell->hasEchoCtl){ DBPRINTF("%s\n", commandShell->echoOff); shutUp = TRUE; } DBPRINTF("%s\n", commandShell->errCheck); } if (shutUp && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOn); } if (cp != NULL) { DBPRINTF("test -d %s && ", cp); DBPRINTF("cd %s\n", Var_Value(".OBJDIR", VAR_GLOBAL, &tmp)); } return 0; } /*- *----------------------------------------------------------------------- * JobSaveCommand -- * Save a command to be executed when everything else is done. * Callback function for JobFinish... * * Results: * Always returns 0 * * Side Effects: * The command is tacked onto the end of postCommands's commands list. * *----------------------------------------------------------------------- */ static int JobSaveCommand(void *cmd, void *gn) { cmd = Var_Subst(NULL, (char *)cmd, (GNode *)gn, FALSE); (void)Lst_AtEnd(postCommands->commands, cmd); return(0); } /*- *----------------------------------------------------------------------- * JobClose -- * Called to close both input and output pipes when a job is finished. * * Results: * Nada * * Side Effects: * The file descriptors associated with the job are closed. * *----------------------------------------------------------------------- */ static void JobClose(Job *job) { clearfd(job); (void)close(job->outPipe); job->outPipe = -1; JobDoOutput(job, TRUE); (void)close(job->inPipe); job->inPipe = -1; } /*- *----------------------------------------------------------------------- * JobFinish -- * Do final processing for the given job including updating * parents and starting new jobs as available/necessary. Note * that we pay no attention to the JOB_IGNERR flag here. * This is because when we're called because of a noexecute flag * or something, jstat.w_status is 0 and when called from * Job_CatchChildren, the status is zeroed if it s/b ignored. * * Input: * job job to finish * status sub-why job went away * * Results: * None * * Side Effects: * Final commands for the job are placed on postCommands. * * If we got an error and are aborting (aborting == ABORT_ERROR) and * the job list is now empty, we are done for the day. * If we recognized an error (errors !=0), we set the aborting flag * to ABORT_ERROR so no more jobs will be started. *----------------------------------------------------------------------- */ /*ARGSUSED*/ static void JobFinish(Job *job, int status) { Boolean done, return_job_token; if (DEBUG(JOB)) { fprintf(debug_file, "Jobfinish: %d [%s], status %d\n", job->pid, job->node->name, status); } if ((WIFEXITED(status) && (((WEXITSTATUS(status) != 0) && !(job->flags & JOB_IGNERR)))) || WIFSIGNALED(status)) { /* * If it exited non-zero and either we're doing things our * way or we're not ignoring errors, the job is finished. * Similarly, if the shell died because of a signal * the job is also finished. In these * cases, finish out the job's output before printing the exit * status... */ JobClose(job); if (job->cmdFILE != NULL && job->cmdFILE != stdout) { (void)fclose(job->cmdFILE); job->cmdFILE = NULL; } done = TRUE; } else if (WIFEXITED(status)) { /* * Deal with ignored errors in -B mode. We need to print a message * telling of the ignored error as well as setting status.w_status * to 0 so the next command gets run. To do this, we set done to be * TRUE if in -B mode and the job exited non-zero. */ done = WEXITSTATUS(status) != 0; /* * Old comment said: "Note we don't * want to close down any of the streams until we know we're at the * end." * But we do. Otherwise when are we going to print the rest of the * stuff? */ JobClose(job); } else { /* * No need to close things down or anything. */ done = FALSE; } if (done) { if (WIFEXITED(status)) { if (DEBUG(JOB)) { (void)fprintf(debug_file, "Process %d [%s] exited.\n", job->pid, job->node->name); } if (WEXITSTATUS(status) != 0) { if (job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } #ifdef USE_META if (useMeta) { meta_job_error(job, job->node, job->flags, WEXITSTATUS(status)); } #endif (void)printf("*** [%s] Error code %d%s\n", job->node->name, WEXITSTATUS(status), (job->flags & JOB_IGNERR) ? " (ignored)" : ""); if (job->flags & JOB_IGNERR) { status = 0; } else { PrintOnError(job->node, NULL); } } else if (DEBUG(JOB)) { if (job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } (void)printf("*** [%s] Completed successfully\n", job->node->name); } } else { if (job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } (void)printf("*** [%s] Signal %d\n", job->node->name, WTERMSIG(status)); } (void)fflush(stdout); } #ifdef USE_META if (useMeta) { meta_job_finish(job); } #endif return_job_token = FALSE; Trace_Log(JOBEND, job); if (!(job->flags & JOB_SPECIAL)) { if ((status != 0) || (aborting == ABORT_ERROR) || (aborting == ABORT_INTERRUPT)) return_job_token = TRUE; } if ((aborting != ABORT_ERROR) && (aborting != ABORT_INTERRUPT) && (status == 0)) { /* * As long as we aren't aborting and the job didn't return a non-zero * status that we shouldn't ignore, we call Make_Update to update * the parents. In addition, any saved commands for the node are placed * on the .END target. */ if (job->tailCmds != NULL) { Lst_ForEachFrom(job->node->commands, job->tailCmds, JobSaveCommand, job->node); } job->node->made = MADE; if (!(job->flags & JOB_SPECIAL)) return_job_token = TRUE; Make_Update(job->node); job->job_state = JOB_ST_FREE; } else if (status != 0) { errors += 1; job->job_state = JOB_ST_FREE; } /* * Set aborting if any error. */ if (errors && !keepgoing && (aborting != ABORT_INTERRUPT)) { /* * If we found any errors in this batch of children and the -k flag * wasn't given, we set the aborting flag so no more jobs get * started. */ aborting = ABORT_ERROR; } if (return_job_token) Job_TokenReturn(); if (aborting == ABORT_ERROR && jobTokensRunning == 0) { /* * If we are aborting and the job table is now empty, we finish. */ Finish(errors); } } /*- *----------------------------------------------------------------------- * Job_Touch -- * Touch the given target. Called by JobStart when the -t flag was * given * * Input: * gn the node of the file to touch * silent TRUE if should not print message * * Results: * None * * Side Effects: * The data modification of the file is changed. In addition, if the * file did not exist, it is created. *----------------------------------------------------------------------- */ void Job_Touch(GNode *gn, Boolean silent) { int streamID; /* ID of stream opened to do the touch */ struct utimbuf times; /* Times for utime() call */ if (gn->type & (OP_JOIN|OP_USE|OP_USEBEFORE|OP_EXEC|OP_OPTIONAL|OP_PHONY)) { /* * .JOIN, .USE, .ZEROTIME and .OPTIONAL targets are "virtual" targets * and, as such, shouldn't really be created. */ return; } if (!silent || NoExecute(gn)) { (void)fprintf(stdout, "touch %s\n", gn->name); (void)fflush(stdout); } if (NoExecute(gn)) { return; } if (gn->type & OP_ARCHV) { Arch_Touch(gn); } else if (gn->type & OP_LIB) { Arch_TouchLib(gn); } else { char *file = gn->path ? gn->path : gn->name; times.actime = times.modtime = now; if (utime(file, ×) < 0){ streamID = open(file, O_RDWR | O_CREAT, 0666); if (streamID >= 0) { char c; /* * Read and write a byte to the file to change the * modification time, then close the file. */ if (read(streamID, &c, 1) == 1) { (void)lseek(streamID, (off_t)0, SEEK_SET); (void)write(streamID, &c, 1); } (void)close(streamID); } else { (void)fprintf(stdout, "*** couldn't touch %s: %s", file, strerror(errno)); (void)fflush(stdout); } } } } /*- *----------------------------------------------------------------------- * Job_CheckCommands -- * Make sure the given node has all the commands it needs. * * Input: * gn The target whose commands need verifying * abortProc Function to abort with message * * Results: * TRUE if the commands list is/was ok. * * Side Effects: * The node will have commands from the .DEFAULT rule added to it * if it needs them. *----------------------------------------------------------------------- */ Boolean Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...)) { if (OP_NOP(gn->type) && Lst_IsEmpty(gn->commands) && ((gn->type & OP_LIB) == 0 || Lst_IsEmpty(gn->children))) { /* * No commands. Look for .DEFAULT rule from which we might infer * commands */ if ((DEFAULT != NULL) && !Lst_IsEmpty(DEFAULT->commands) && (gn->type & OP_SPECIAL) == 0) { char *p1; /* * Make only looks for a .DEFAULT if the node was never the * target of an operator, so that's what we do too. If * a .DEFAULT was given, we substitute its commands for gn's * commands and set the IMPSRC variable to be the target's name * The DEFAULT node acts like a transformation rule, in that * gn also inherits any attributes or sources attached to * .DEFAULT itself. */ Make_HandleUse(DEFAULT, gn); Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), gn, 0); if (p1) free(p1); } else if (Dir_MTime(gn) == 0 && (gn->type & OP_SPECIAL) == 0) { /* * The node wasn't the target of an operator we have no .DEFAULT * rule to go on and the target doesn't already exist. There's * nothing more we can do for this branch. If the -k flag wasn't * given, we stop in our tracks, otherwise we just don't update * this node's parents so they never get examined. */ static const char msg[] = ": don't know how to make"; if (gn->flags & FROM_DEPEND) { fprintf(stdout, "%s: ignoring stale %s for %s\n", progname, makeDependfile, gn->name); return TRUE; } if (gn->type & OP_OPTIONAL) { (void)fprintf(stdout, "%s%s %s (ignored)\n", progname, msg, gn->name); (void)fflush(stdout); } else if (keepgoing) { (void)fprintf(stdout, "%s%s %s (continuing)\n", progname, msg, gn->name); (void)fflush(stdout); return FALSE; } else { (*abortProc)("%s%s %s. Stop", progname, msg, gn->name); return FALSE; } } } return TRUE; } /*- *----------------------------------------------------------------------- * JobExec -- * Execute the shell for the given job. Called from JobStart * * Input: * job Job to execute * * Results: * None. * * Side Effects: * A shell is executed, outputs is altered and the Job structure added * to the job table. * *----------------------------------------------------------------------- */ static void JobExec(Job *job, char **argv) { int cpid; /* ID of new child */ sigset_t mask; job->flags &= ~JOB_TRACED; if (DEBUG(JOB)) { int i; (void)fprintf(debug_file, "Running %s %sly\n", job->node->name, "local"); (void)fprintf(debug_file, "\tCommand: "); for (i = 0; argv[i] != NULL; i++) { (void)fprintf(debug_file, "%s ", argv[i]); } (void)fprintf(debug_file, "\n"); } /* * Some jobs produce no output and it's disconcerting to have * no feedback of their running (since they produce no output, the * banner with their name in it never appears). This is an attempt to * provide that feedback, even if nothing follows it. */ if ((lastNode != job->node) && !(job->flags & JOB_SILENT)) { MESSAGE(stdout, job->node); lastNode = job->node; } /* No interruptions until this job is on the `jobs' list */ JobSigLock(&mask); /* Pre-emptively mark job running, pid still zero though */ job->job_state = JOB_ST_RUNNING; cpid = vFork(); if (cpid == -1) Punt("Cannot vfork: %s", strerror(errno)); if (cpid == 0) { /* Child */ sigset_t tmask; #ifdef USE_META if (useMeta) { meta_job_child(job); } #endif /* * Reset all signal handlers; this is necessary because we also * need to unblock signals before we exec(2). */ JobSigReset(); /* Now unblock signals */ sigemptyset(&tmask); JobSigUnlock(&tmask); /* * Must duplicate the input stream down to the child's input and * reset it to the beginning (again). Since the stream was marked * close-on-exec, we must clear that bit in the new input. */ if (dup2(FILENO(job->cmdFILE), 0) == -1) { execError("dup2", "job->cmdFILE"); _exit(1); } (void)fcntl(0, F_SETFD, 0); (void)lseek(0, (off_t)0, SEEK_SET); if (job->node->type & OP_MAKE) { /* * Pass job token pipe to submakes. */ fcntl(tokenWaitJob.inPipe, F_SETFD, 0); fcntl(tokenWaitJob.outPipe, F_SETFD, 0); } /* * Set up the child's output to be routed through the pipe * we've created for it. */ if (dup2(job->outPipe, 1) == -1) { execError("dup2", "job->outPipe"); _exit(1); } /* * The output channels are marked close on exec. This bit was * duplicated by the dup2(on some systems), so we have to clear * it before routing the shell's error output to the same place as * its standard output. */ (void)fcntl(1, F_SETFD, 0); if (dup2(1, 2) == -1) { execError("dup2", "1, 2"); _exit(1); } /* * We want to switch the child into a different process family so * we can kill it and all its descendants in one fell swoop, * by killing its process family, but not commit suicide. */ #if defined(SYSV) /* XXX: dsl - I'm sure this should be setpgrp()... */ (void)setsid(); #else (void)setpgid(0, getpid()); #endif Var_ExportVars(); (void)execv(shellPath, argv); execError("exec", shellPath); _exit(1); } /* Parent, continuing after the child exec */ job->pid = cpid; Trace_Log(JOBSTART, job); /* * Set the current position in the buffer to the beginning * and mark another stream to watch in the outputs mask */ job->curPos = 0; watchfd(job); if (job->cmdFILE != NULL && job->cmdFILE != stdout) { (void)fclose(job->cmdFILE); job->cmdFILE = NULL; } /* * Now the job is actually running, add it to the table. */ if (DEBUG(JOB)) { fprintf(debug_file, "JobExec(%s): pid %d added to jobs table\n", job->node->name, job->pid); job_table_dump("job started"); } JobSigUnlock(&mask); } /*- *----------------------------------------------------------------------- * JobMakeArgv -- * Create the argv needed to execute the shell for a given job. * * * Results: * * Side Effects: * *----------------------------------------------------------------------- */ static void JobMakeArgv(Job *job, char **argv) { int argc; static char args[10]; /* For merged arguments */ argv[0] = UNCONST(shellName); argc = 1; if ((commandShell->exit && (*commandShell->exit != '-')) || (commandShell->echo && (*commandShell->echo != '-'))) { /* * At least one of the flags doesn't have a minus before it, so * merge them together. Have to do this because the *(&(@*#*&#$# * Bourne shell thinks its second argument is a file to source. * Grrrr. Note the ten-character limitation on the combined arguments. */ (void)snprintf(args, sizeof(args), "-%s%s", ((job->flags & JOB_IGNERR) ? "" : (commandShell->exit ? commandShell->exit : "")), ((job->flags & JOB_SILENT) ? "" : (commandShell->echo ? commandShell->echo : ""))); if (args[1]) { argv[argc] = args; argc++; } } else { if (!(job->flags & JOB_IGNERR) && commandShell->exit) { argv[argc] = UNCONST(commandShell->exit); argc++; } if (!(job->flags & JOB_SILENT) && commandShell->echo) { argv[argc] = UNCONST(commandShell->echo); argc++; } } argv[argc] = NULL; } /*- *----------------------------------------------------------------------- * JobStart -- * Start a target-creation process going for the target described * by the graph node gn. * * Input: * gn target to create * flags flags for the job to override normal ones. * e.g. JOB_SPECIAL or JOB_IGNDOTS * previous The previous Job structure for this node, if any. * * Results: * JOB_ERROR if there was an error in the commands, JOB_FINISHED * if there isn't actually anything left to do for the job and * JOB_RUNNING if the job has been started. * * Side Effects: * A new Job node is created and added to the list of running * jobs. PMake is forked and a child shell created. * * NB: I'm fairly sure that this code is never called with JOB_SPECIAL set * JOB_IGNDOTS is never set (dsl) * Also the return value is ignored by everyone. *----------------------------------------------------------------------- */ static int JobStart(GNode *gn, int flags) { Job *job; /* new job descriptor */ char *argv[10]; /* Argument vector to shell */ Boolean cmdsOK; /* true if the nodes commands were all right */ Boolean noExec; /* Set true if we decide not to run the job */ int tfd; /* File descriptor to the temp file */ for (job = job_table; job < job_table_end; job++) { if (job->job_state == JOB_ST_FREE) break; } if (job >= job_table_end) Punt("JobStart no job slots vacant"); memset(job, 0, sizeof *job); job->job_state = JOB_ST_SETUP; if (gn->type & OP_SPECIAL) flags |= JOB_SPECIAL; job->node = gn; job->tailCmds = NULL; /* * Set the initial value of the flags for this job based on the global * ones and the node's attributes... Any flags supplied by the caller * are also added to the field. */ job->flags = 0; if (Targ_Ignore(gn)) { job->flags |= JOB_IGNERR; } if (Targ_Silent(gn)) { job->flags |= JOB_SILENT; } job->flags |= flags; /* * Check the commands now so any attributes from .DEFAULT have a chance * to migrate to the node */ cmdsOK = Job_CheckCommands(gn, Error); job->inPollfd = NULL; /* * If the -n flag wasn't given, we open up OUR (not the child's) * temporary file to stuff commands in it. The thing is rd/wr so we don't * need to reopen it to feed it to the shell. If the -n flag *was* given, * we just set the file to be stdout. Cute, huh? */ if (((gn->type & OP_MAKE) && !(noRecursiveExecute)) || (!noExecute && !touchFlag)) { /* * tfile is the name of a file into which all shell commands are * put. It is removed before the child shell is executed, unless * DEBUG(SCRIPT) is set. */ char *tfile; sigset_t mask; /* * We're serious here, but if the commands were bogus, we're * also dead... */ if (!cmdsOK) { PrintOnError(gn, NULL); /* provide some clue */ DieHorribly(); } JobSigLock(&mask); tfd = mkTempFile(TMPPAT, &tfile); if (!DEBUG(SCRIPT)) (void)eunlink(tfile); JobSigUnlock(&mask); job->cmdFILE = fdopen(tfd, "w+"); if (job->cmdFILE == NULL) { Punt("Could not fdopen %s", tfile); } (void)fcntl(FILENO(job->cmdFILE), F_SETFD, 1); /* * Send the commands to the command file, flush all its buffers then * rewind and remove the thing. */ noExec = FALSE; #ifdef USE_META if (useMeta) { meta_job_start(job, gn); } #endif /* * We can do all the commands at once. hooray for sanity */ numCommands = 0; Lst_ForEach(gn->commands, JobPrintCommand, job); /* * If we didn't print out any commands to the shell script, * there's not much point in executing the shell, is there? */ if (numCommands == 0) { noExec = TRUE; } free(tfile); } else if (NoExecute(gn)) { /* * Not executing anything -- just print all the commands to stdout * in one fell swoop. This will still set up job->tailCmds correctly. */ if (lastNode != gn) { MESSAGE(stdout, gn); lastNode = gn; } job->cmdFILE = stdout; /* * Only print the commands if they're ok, but don't die if they're * not -- just let the user know they're bad and keep going. It * doesn't do any harm in this case and may do some good. */ if (cmdsOK) { Lst_ForEach(gn->commands, JobPrintCommand, job); } /* * Don't execute the shell, thank you. */ noExec = TRUE; } else { /* * Just touch the target and note that no shell should be executed. * Set cmdFILE to stdout to make life easier. Check the commands, too, * but don't die if they're no good -- it does no harm to keep working * up the graph. */ job->cmdFILE = stdout; Job_Touch(gn, job->flags&JOB_SILENT); noExec = TRUE; } /* Just in case it isn't already... */ (void)fflush(job->cmdFILE); /* * If we're not supposed to execute a shell, don't. */ if (noExec) { if (!(job->flags & JOB_SPECIAL)) Job_TokenReturn(); /* * Unlink and close the command file if we opened one */ if (job->cmdFILE != stdout) { if (job->cmdFILE != NULL) { (void)fclose(job->cmdFILE); job->cmdFILE = NULL; } } /* * We only want to work our way up the graph if we aren't here because * the commands for the job were no good. */ if (cmdsOK && aborting == 0) { if (job->tailCmds != NULL) { Lst_ForEachFrom(job->node->commands, job->tailCmds, JobSaveCommand, job->node); } job->node->made = MADE; Make_Update(job->node); } job->job_state = JOB_ST_FREE; return cmdsOK ? JOB_FINISHED : JOB_ERROR; } /* * Set up the control arguments to the shell. This is based on the flags * set earlier for this job. */ JobMakeArgv(job, argv); /* Create the pipe by which we'll get the shell's output. */ JobCreatePipe(job, 3); JobExec(job, argv); return(JOB_RUNNING); } static char * JobOutput(Job *job, char *cp, char *endp, int msg) { char *ecp; if (commandShell->noPrint) { ecp = Str_FindSubstring(cp, commandShell->noPrint); while (ecp != NULL) { if (cp != ecp) { *ecp = '\0'; if (!beSilent && msg && job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } /* * The only way there wouldn't be a newline after * this line is if it were the last in the buffer. * however, since the non-printable comes after it, * there must be a newline, so we don't print one. */ (void)fprintf(stdout, "%s", cp); (void)fflush(stdout); } cp = ecp + commandShell->noPLen; if (cp != endp) { /* * Still more to print, look again after skipping * the whitespace following the non-printable * command.... */ cp++; while (*cp == ' ' || *cp == '\t' || *cp == '\n') { cp++; } ecp = Str_FindSubstring(cp, commandShell->noPrint); } else { return cp; } } } return cp; } /*- *----------------------------------------------------------------------- * JobDoOutput -- * This function is called at different times depending on * whether the user has specified that output is to be collected * via pipes or temporary files. In the former case, we are called * whenever there is something to read on the pipe. We collect more * output from the given job and store it in the job's outBuf. If * this makes up a line, we print it tagged by the job's identifier, * as necessary. * If output has been collected in a temporary file, we open the * file and read it line by line, transfering it to our own * output channel until the file is empty. At which point we * remove the temporary file. * In both cases, however, we keep our figurative eye out for the * 'noPrint' line for the shell from which the output came. If * we recognize a line, we don't print it. If the command is not * alone on the line (the character after it is not \0 or \n), we * do print whatever follows it. * * Input: * job the job whose output needs printing * finish TRUE if this is the last time we'll be called * for this job * * Results: * None * * Side Effects: * curPos may be shifted as may the contents of outBuf. *----------------------------------------------------------------------- */ STATIC void JobDoOutput(Job *job, Boolean finish) { Boolean gotNL = FALSE; /* true if got a newline */ Boolean fbuf; /* true if our buffer filled up */ int nr; /* number of bytes read */ int i; /* auxiliary index into outBuf */ int max; /* limit for i (end of current data) */ int nRead; /* (Temporary) number of bytes read */ /* * Read as many bytes as will fit in the buffer. */ end_loop: gotNL = FALSE; fbuf = FALSE; nRead = read(job->inPipe, &job->outBuf[job->curPos], JOB_BUFSIZE - job->curPos); if (nRead < 0) { if (errno == EAGAIN) return; if (DEBUG(JOB)) { perror("JobDoOutput(piperead)"); } nr = 0; } else { nr = nRead; } /* * If we hit the end-of-file (the job is dead), we must flush its * remaining output, so pretend we read a newline if there's any * output remaining in the buffer. * Also clear the 'finish' flag so we stop looping. */ if ((nr == 0) && (job->curPos != 0)) { job->outBuf[job->curPos] = '\n'; nr = 1; finish = FALSE; } else if (nr == 0) { finish = FALSE; } /* * Look for the last newline in the bytes we just got. If there is * one, break out of the loop with 'i' as its index and gotNL set * TRUE. */ max = job->curPos + nr; for (i = job->curPos + nr - 1; i >= job->curPos; i--) { if (job->outBuf[i] == '\n') { gotNL = TRUE; break; } else if (job->outBuf[i] == '\0') { /* * Why? */ job->outBuf[i] = ' '; } } if (!gotNL) { job->curPos += nr; if (job->curPos == JOB_BUFSIZE) { /* * If we've run out of buffer space, we have no choice * but to print the stuff. sigh. */ fbuf = TRUE; i = job->curPos; } } if (gotNL || fbuf) { /* * Need to send the output to the screen. Null terminate it * first, overwriting the newline character if there was one. * So long as the line isn't one we should filter (according * to the shell description), we print the line, preceded * by a target banner if this target isn't the same as the * one for which we last printed something. * The rest of the data in the buffer are then shifted down * to the start of the buffer and curPos is set accordingly. */ job->outBuf[i] = '\0'; if (i >= job->curPos) { char *cp; cp = JobOutput(job, job->outBuf, &job->outBuf[i], FALSE); /* * There's still more in that thar buffer. This time, though, * we know there's no newline at the end, so we add one of * our own free will. */ if (*cp != '\0') { if (!beSilent && job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } #ifdef USE_META if (useMeta) { meta_job_output(job, cp, gotNL ? "\n" : ""); } #endif (void)fprintf(stdout, "%s%s", cp, gotNL ? "\n" : ""); (void)fflush(stdout); } } if (i < max - 1) { /* shift the remaining characters down */ (void)memcpy(job->outBuf, &job->outBuf[i + 1], max - (i + 1)); job->curPos = max - (i + 1); } else { /* * We have written everything out, so we just start over * from the start of the buffer. No copying. No nothing. */ job->curPos = 0; } } if (finish) { /* * If the finish flag is true, we must loop until we hit * end-of-file on the pipe. This is guaranteed to happen * eventually since the other end of the pipe is now closed * (we closed it explicitly and the child has exited). When * we do get an EOF, finish will be set FALSE and we'll fall * through and out. */ goto end_loop; } } static void JobRun(GNode *targ) { #ifdef notyet /* * Unfortunately it is too complicated to run .BEGIN, .END, * and .INTERRUPT job in the parallel job module. This has * the nice side effect that it avoids a lot of other problems. */ Lst lst = Lst_Init(FALSE); Lst_AtEnd(lst, targ); (void)Make_Run(lst); Lst_Destroy(lst, NULL); JobStart(targ, JOB_SPECIAL); while (jobTokensRunning) { Job_CatchOutput(); } #else Compat_Make(targ, targ); if (targ->made == ERROR) { PrintOnError(targ, "\n\nStop."); exit(1); } #endif } /*- *----------------------------------------------------------------------- * Job_CatchChildren -- * Handle the exit of a child. Called from Make_Make. * * Input: * block TRUE if should block on the wait * * Results: * none. * * Side Effects: * The job descriptor is removed from the list of children. * * Notes: * We do waits, blocking or not, according to the wisdom of our * caller, until there are no more children to report. For each * job, call JobFinish to finish things off. * *----------------------------------------------------------------------- */ void Job_CatchChildren(void) { int pid; /* pid of dead child */ int status; /* Exit/termination status */ /* * Don't even bother if we know there's no one around. */ if (jobTokensRunning == 0) return; while ((pid = waitpid((pid_t) -1, &status, WNOHANG | WUNTRACED)) > 0) { if (DEBUG(JOB)) { (void)fprintf(debug_file, "Process %d exited/stopped status %x.\n", pid, status); } JobReapChild(pid, status, TRUE); } } /* * It is possible that wait[pid]() was called from elsewhere, * this lets us reap jobs regardless. */ void JobReapChild(pid_t pid, int status, Boolean isJobs) { Job *job; /* job descriptor for dead child */ /* * Don't even bother if we know there's no one around. */ if (jobTokensRunning == 0) return; job = JobFindPid(pid, JOB_ST_RUNNING, isJobs); if (job == NULL) { if (isJobs) { if (!lurking_children) Error("Child (%d) status %x not in table?", pid, status); } return; /* not ours */ } if (WIFSTOPPED(status)) { if (DEBUG(JOB)) { (void)fprintf(debug_file, "Process %d (%s) stopped.\n", job->pid, job->node->name); } if (!make_suspended) { switch (WSTOPSIG(status)) { case SIGTSTP: (void)printf("*** [%s] Suspended\n", job->node->name); break; case SIGSTOP: (void)printf("*** [%s] Stopped\n", job->node->name); break; default: (void)printf("*** [%s] Stopped -- signal %d\n", job->node->name, WSTOPSIG(status)); } job->job_suspended = 1; } (void)fflush(stdout); return; } job->job_state = JOB_ST_FINISHED; job->exit_status = status; JobFinish(job, status); } /*- *----------------------------------------------------------------------- * Job_CatchOutput -- * Catch the output from our children, if we're using * pipes do so. Otherwise just block time until we get a * signal(most likely a SIGCHLD) since there's no point in * just spinning when there's nothing to do and the reaping * of a child can wait for a while. * * Results: * None * * Side Effects: * Output is read from pipes if we're piping. * ----------------------------------------------------------------------- */ void Job_CatchOutput(void) { int nready; Job *job; int i; (void)fflush(stdout); /* The first fd in the list is the job token pipe */ nready = poll(fds + 1 - wantToken, nfds - 1 + wantToken, POLL_MSEC); if (nready < 0 || readyfd(&childExitJob)) { char token = 0; nready -= 1; (void)read(childExitJob.inPipe, &token, 1); if (token == DO_JOB_RESUME[0]) /* Complete relay requested from our SIGCONT handler */ JobRestartJobs(); Job_CatchChildren(); } if (nready <= 0) return; if (wantToken && readyfd(&tokenWaitJob)) nready--; for (i = 2; i < nfds; i++) { if (!fds[i].revents) continue; job = jobfds[i]; if (job->job_state != JOB_ST_RUNNING) continue; JobDoOutput(job, FALSE); } } /*- *----------------------------------------------------------------------- * Job_Make -- * Start the creation of a target. Basically a front-end for * JobStart used by the Make module. * * Results: * None. * * Side Effects: * Another job is started. * *----------------------------------------------------------------------- */ void Job_Make(GNode *gn) { (void)JobStart(gn, 0); } void Shell_Init(void) { if (shellPath == NULL) { /* * We are using the default shell, which may be an absolute * path if DEFSHELL_CUSTOM is defined. */ shellName = commandShell->name; #ifdef DEFSHELL_CUSTOM if (*shellName == '/') { shellPath = shellName; shellName = strrchr(shellPath, '/'); shellName++; } else #endif shellPath = str_concat(_PATH_DEFSHELLDIR, shellName, STR_ADDSLASH); } if (commandShell->exit == NULL) { commandShell->exit = ""; } if (commandShell->echo == NULL) { commandShell->echo = ""; } } /*- * Returns the string literal that is used in the current command shell * to produce a newline character. */ const char * Shell_GetNewline(void) { return commandShell->newline; } void Job_SetPrefix(void) { if (targPrefix) { free(targPrefix); } else if (!Var_Exists(MAKE_JOB_PREFIX, VAR_GLOBAL)) { Var_Set(MAKE_JOB_PREFIX, "---", VAR_GLOBAL, 0); } targPrefix = Var_Subst(NULL, "${" MAKE_JOB_PREFIX "}", VAR_GLOBAL, 0); } /*- *----------------------------------------------------------------------- * Job_Init -- * Initialize the process module * * Input: * * Results: * none * * Side Effects: * lists and counters are initialized *----------------------------------------------------------------------- */ void Job_Init(void) { GNode *begin; /* node for commands to do at the very start */ /* Allocate space for all the job info */ job_table = bmake_malloc(maxJobs * sizeof *job_table); memset(job_table, 0, maxJobs * sizeof *job_table); job_table_end = job_table + maxJobs; wantToken = 0; aborting = 0; errors = 0; lastNode = NULL; if (maxJobs == 1) { /* * If only one job can run at a time, there's no need for a banner, * is there? */ targFmt = ""; } else { targFmt = TARG_FMT; } /* * There is a non-zero chance that we already have children. * eg after 'make -f- < 0) continue; if (rval == 0) lurking_children = 1; break; } Shell_Init(); JobCreatePipe(&childExitJob, 3); /* We can only need to wait for tokens, children and output from each job */ fds = bmake_malloc(sizeof (*fds) * (2 + maxJobs)); jobfds = bmake_malloc(sizeof (*jobfds) * (2 + maxJobs)); /* These are permanent entries and take slots 0 and 1 */ watchfd(&tokenWaitJob); watchfd(&childExitJob); sigemptyset(&caught_signals); /* * Install a SIGCHLD handler. */ (void)bmake_signal(SIGCHLD, JobChildSig); sigaddset(&caught_signals, SIGCHLD); #define ADDSIG(s,h) \ if (bmake_signal(s, SIG_IGN) != SIG_IGN) { \ sigaddset(&caught_signals, s); \ (void)bmake_signal(s, h); \ } /* * Catch the four signals that POSIX specifies if they aren't ignored. * JobPassSig will take care of calling JobInterrupt if appropriate. */ ADDSIG(SIGINT, JobPassSig_int) ADDSIG(SIGHUP, JobPassSig_term) ADDSIG(SIGTERM, JobPassSig_term) ADDSIG(SIGQUIT, JobPassSig_term) /* * There are additional signals that need to be caught and passed if * either the export system wants to be told directly of signals or if * we're giving each job its own process group (since then it won't get * signals from the terminal driver as we own the terminal) */ ADDSIG(SIGTSTP, JobPassSig_suspend) ADDSIG(SIGTTOU, JobPassSig_suspend) ADDSIG(SIGTTIN, JobPassSig_suspend) ADDSIG(SIGWINCH, JobCondPassSig) ADDSIG(SIGCONT, JobContinueSig) #undef ADDSIG begin = Targ_FindNode(".BEGIN", TARG_NOCREATE); if (begin != NULL) { JobRun(begin); if (begin->made == ERROR) { PrintOnError(begin, "\n\nStop."); exit(1); } } postCommands = Targ_FindNode(".END", TARG_CREATE); } static void JobSigReset(void) { #define DELSIG(s) \ if (sigismember(&caught_signals, s)) { \ (void)bmake_signal(s, SIG_DFL); \ } DELSIG(SIGINT) DELSIG(SIGHUP) DELSIG(SIGQUIT) DELSIG(SIGTERM) DELSIG(SIGTSTP) DELSIG(SIGTTOU) DELSIG(SIGTTIN) DELSIG(SIGWINCH) DELSIG(SIGCONT) #undef DELSIG (void)bmake_signal(SIGCHLD, SIG_DFL); } /*- *----------------------------------------------------------------------- * JobMatchShell -- * Find a shell in 'shells' given its name. * * Results: * A pointer to the Shell structure. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static Shell * JobMatchShell(const char *name) { Shell *sh; for (sh = shells; sh->name != NULL; sh++) { if (strcmp(name, sh->name) == 0) return (sh); } return NULL; } /*- *----------------------------------------------------------------------- * Job_ParseShell -- * Parse a shell specification and set up commandShell, shellPath * and shellName appropriately. * * Input: * line The shell spec * * Results: * FAILURE if the specification was incorrect. * * Side Effects: * commandShell points to a Shell structure (either predefined or * created from the shell spec), shellPath is the full path of the * shell described by commandShell, while shellName is just the * final component of shellPath. * * Notes: * A shell specification consists of a .SHELL target, with dependency * operator, followed by a series of blank-separated words. Double * quotes can be used to use blanks in words. A backslash escapes * anything (most notably a double-quote and a space) and * provides the functionality it does in C. Each word consists of * keyword and value separated by an equal sign. There should be no * unnecessary spaces in the word. The keywords are as follows: * name Name of shell. * path Location of shell. * quiet Command to turn off echoing. * echo Command to turn echoing on * filter Result of turning off echoing that shouldn't be * printed. * echoFlag Flag to turn echoing on at the start * errFlag Flag to turn error checking on at the start * hasErrCtl True if shell has error checking control * newline String literal to represent a newline char * check Command to turn on error checking if hasErrCtl * is TRUE or template of command to echo a command * for which error checking is off if hasErrCtl is * FALSE. * ignore Command to turn off error checking if hasErrCtl * is TRUE or template of command to execute a * command so as to ignore any errors it returns if * hasErrCtl is FALSE. * *----------------------------------------------------------------------- */ ReturnStatus Job_ParseShell(char *line) { char **words; char **argv; int argc; char *path; Shell newShell; Boolean fullSpec = FALSE; Shell *sh; while (isspace((unsigned char)*line)) { line++; } if (shellArgv) free(UNCONST(shellArgv)); memset(&newShell, 0, sizeof(newShell)); /* * Parse the specification by keyword */ words = brk_string(line, &argc, TRUE, &path); if (words == NULL) { Error("Unterminated quoted string [%s]", line); return FAILURE; } shellArgv = path; for (path = NULL, argv = words; argc != 0; argc--, argv++) { if (strncmp(*argv, "path=", 5) == 0) { path = &argv[0][5]; } else if (strncmp(*argv, "name=", 5) == 0) { newShell.name = &argv[0][5]; } else { if (strncmp(*argv, "quiet=", 6) == 0) { newShell.echoOff = &argv[0][6]; } else if (strncmp(*argv, "echo=", 5) == 0) { newShell.echoOn = &argv[0][5]; } else if (strncmp(*argv, "filter=", 7) == 0) { newShell.noPrint = &argv[0][7]; newShell.noPLen = strlen(newShell.noPrint); } else if (strncmp(*argv, "echoFlag=", 9) == 0) { newShell.echo = &argv[0][9]; } else if (strncmp(*argv, "errFlag=", 8) == 0) { newShell.exit = &argv[0][8]; } else if (strncmp(*argv, "hasErrCtl=", 10) == 0) { char c = argv[0][10]; newShell.hasErrCtl = !((c != 'Y') && (c != 'y') && (c != 'T') && (c != 't')); } else if (strncmp(*argv, "newline=", 8) == 0) { newShell.newline = &argv[0][8]; } else if (strncmp(*argv, "check=", 6) == 0) { newShell.errCheck = &argv[0][6]; } else if (strncmp(*argv, "ignore=", 7) == 0) { newShell.ignErr = &argv[0][7]; } else if (strncmp(*argv, "errout=", 7) == 0) { newShell.errOut = &argv[0][7]; } else if (strncmp(*argv, "comment=", 8) == 0) { newShell.commentChar = argv[0][8]; } else { Parse_Error(PARSE_FATAL, "Unknown keyword \"%s\"", *argv); free(words); return(FAILURE); } fullSpec = TRUE; } } if (path == NULL) { /* * If no path was given, the user wants one of the pre-defined shells, * yes? So we find the one s/he wants with the help of JobMatchShell * and set things up the right way. shellPath will be set up by * Job_Init. */ if (newShell.name == NULL) { Parse_Error(PARSE_FATAL, "Neither path nor name specified"); free(words); return(FAILURE); } else { if ((sh = JobMatchShell(newShell.name)) == NULL) { Parse_Error(PARSE_WARNING, "%s: No matching shell", newShell.name); free(words); return(FAILURE); } commandShell = sh; shellName = newShell.name; } } else { /* * The user provided a path. If s/he gave nothing else (fullSpec is * FALSE), try and find a matching shell in the ones we know of. * Else we just take the specification at its word and copy it * to a new location. In either case, we need to record the * path the user gave for the shell. */ shellPath = path; path = strrchr(path, '/'); if (path == NULL) { path = UNCONST(shellPath); } else { path += 1; } if (newShell.name != NULL) { shellName = newShell.name; } else { shellName = path; } if (!fullSpec) { if ((sh = JobMatchShell(shellName)) == NULL) { Parse_Error(PARSE_WARNING, "%s: No matching shell", shellName); free(words); return(FAILURE); } commandShell = sh; } else { commandShell = bmake_malloc(sizeof(Shell)); *commandShell = newShell; } } if (commandShell->echoOn && commandShell->echoOff) { commandShell->hasEchoCtl = TRUE; } if (!commandShell->hasErrCtl) { if (commandShell->errCheck == NULL) { commandShell->errCheck = ""; } if (commandShell->ignErr == NULL) { commandShell->ignErr = "%s\n"; } } /* * Do not free up the words themselves, since they might be in use by the * shell specification. */ free(words); return SUCCESS; } /*- *----------------------------------------------------------------------- * JobInterrupt -- * Handle the receipt of an interrupt. * * Input: * runINTERRUPT Non-zero if commands for the .INTERRUPT target * should be executed * signo signal received * * Results: * None * * Side Effects: * All children are killed. Another job will be started if the * .INTERRUPT target was given. *----------------------------------------------------------------------- */ static void JobInterrupt(int runINTERRUPT, int signo) { Job *job; /* job descriptor in that element */ GNode *interrupt; /* the node describing the .INTERRUPT target */ sigset_t mask; GNode *gn; aborting = ABORT_INTERRUPT; JobSigLock(&mask); for (job = job_table; job < job_table_end; job++) { if (job->job_state != JOB_ST_RUNNING) continue; gn = job->node; if ((gn->type & (OP_JOIN|OP_PHONY)) == 0 && !Targ_Precious(gn)) { char *file = (gn->path == NULL ? gn->name : gn->path); if (!noExecute && eunlink(file) != -1) { Error("*** %s removed", file); } } if (job->pid) { if (DEBUG(JOB)) { (void)fprintf(debug_file, "JobInterrupt passing signal %d to child %d.\n", signo, job->pid); } KILLPG(job->pid, signo); } } JobSigUnlock(&mask); if (runINTERRUPT && !touchFlag) { interrupt = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); if (interrupt != NULL) { ignoreErrors = FALSE; JobRun(interrupt); } } Trace_Log(MAKEINTR, 0); exit(signo); } /* *----------------------------------------------------------------------- * Job_Finish -- * Do final processing such as the running of the commands * attached to the .END target. * * Results: * Number of errors reported. * * Side Effects: * None. *----------------------------------------------------------------------- */ int Job_Finish(void) { if (postCommands != NULL && (!Lst_IsEmpty(postCommands->commands) || !Lst_IsEmpty(postCommands->children))) { if (errors) { Error("Errors reported so .END ignored"); } else { JobRun(postCommands); } } return(errors); } /*- *----------------------------------------------------------------------- * Job_End -- * Cleanup any memory used by the jobs module * * Results: * None. * * Side Effects: * Memory is freed *----------------------------------------------------------------------- */ void Job_End(void) { #ifdef CLEANUP if (shellArgv) free(shellArgv); #endif } /*- *----------------------------------------------------------------------- * Job_Wait -- * Waits for all running jobs to finish and returns. Sets 'aborting' * to ABORT_WAIT to prevent other jobs from starting. * * Results: * None. * * Side Effects: * Currently running jobs finish. * *----------------------------------------------------------------------- */ void Job_Wait(void) { aborting = ABORT_WAIT; while (jobTokensRunning != 0) { Job_CatchOutput(); } aborting = 0; } /*- *----------------------------------------------------------------------- * Job_AbortAll -- * Abort all currently running jobs without handling output or anything. * This function is to be called only in the event of a major * error. Most definitely NOT to be called from JobInterrupt. * * Results: * None * * Side Effects: * All children are killed, not just the firstborn *----------------------------------------------------------------------- */ void Job_AbortAll(void) { Job *job; /* the job descriptor in that element */ int foo; aborting = ABORT_ERROR; if (jobTokensRunning) { for (job = job_table; job < job_table_end; job++) { if (job->job_state != JOB_ST_RUNNING) continue; /* * kill the child process with increasingly drastic signals to make * darn sure it's dead. */ KILLPG(job->pid, SIGINT); KILLPG(job->pid, SIGKILL); } } /* * Catch as many children as want to report in at first, then give up */ while (waitpid((pid_t) -1, &foo, WNOHANG) > 0) continue; } /*- *----------------------------------------------------------------------- * JobRestartJobs -- * Tries to restart stopped jobs if there are slots available. * Called in process context in response to a SIGCONT. * * Results: * None. * * Side Effects: * Resumes jobs. * *----------------------------------------------------------------------- */ static void JobRestartJobs(void) { Job *job; for (job = job_table; job < job_table_end; job++) { if (job->job_state == JOB_ST_RUNNING && (make_suspended || job->job_suspended)) { if (DEBUG(JOB)) { (void)fprintf(debug_file, "Restarting stopped job pid %d.\n", job->pid); } if (job->job_suspended) { (void)printf("*** [%s] Continued\n", job->node->name); (void)fflush(stdout); } job->job_suspended = 0; if (KILLPG(job->pid, SIGCONT) != 0 && DEBUG(JOB)) { fprintf(debug_file, "Failed to send SIGCONT to %d\n", job->pid); } } if (job->job_state == JOB_ST_FINISHED) /* Job exit deferred after calling waitpid() in a signal handler */ JobFinish(job, job->exit_status); } make_suspended = 0; } static void watchfd(Job *job) { if (job->inPollfd != NULL) Punt("Watching watched job"); fds[nfds].fd = job->inPipe; fds[nfds].events = POLLIN; jobfds[nfds] = job; job->inPollfd = &fds[nfds]; nfds++; } static void clearfd(Job *job) { int i; if (job->inPollfd == NULL) Punt("Unwatching unwatched job"); i = job->inPollfd - fds; nfds--; /* * Move last job in table into hole made by dead job. */ if (nfds != i) { fds[i] = fds[nfds]; jobfds[i] = jobfds[nfds]; jobfds[i]->inPollfd = &fds[i]; } job->inPollfd = NULL; } static int readyfd(Job *job) { if (job->inPollfd == NULL) Punt("Polling unwatched job"); return (job->inPollfd->revents & POLLIN) != 0; } /*- *----------------------------------------------------------------------- * JobTokenAdd -- * Put a token into the job pipe so that some make process can start * another job. * * Side Effects: * Allows more build jobs to be spawned somewhere. * *----------------------------------------------------------------------- */ static void JobTokenAdd(void) { char tok = JOB_TOKENS[aborting], tok1; /* If we are depositing an error token flush everything else */ while (tok != '+' && read(tokenWaitJob.inPipe, &tok1, 1) == 1) continue; if (DEBUG(JOB)) fprintf(debug_file, "(%d) aborting %d, deposit token %c\n", getpid(), aborting, JOB_TOKENS[aborting]); write(tokenWaitJob.outPipe, &tok, 1); } /*- *----------------------------------------------------------------------- * Job_ServerStartTokenAdd -- * Prep the job token pipe in the root make process. * *----------------------------------------------------------------------- */ void Job_ServerStart(int max_tokens, int jp_0, int jp_1) { int i; char jobarg[64]; if (jp_0 >= 0 && jp_1 >= 0) { /* Pipe passed in from parent */ tokenWaitJob.inPipe = jp_0; tokenWaitJob.outPipe = jp_1; return; } JobCreatePipe(&tokenWaitJob, 15); snprintf(jobarg, sizeof(jobarg), "%d,%d", tokenWaitJob.inPipe, tokenWaitJob.outPipe); Var_Append(MAKEFLAGS, "-J", VAR_GLOBAL); Var_Append(MAKEFLAGS, jobarg, VAR_GLOBAL); /* * Preload the job pipe with one token per job, save the one * "extra" token for the primary job. * * XXX should clip maxJobs against PIPE_BUF -- if max_tokens is * larger than the write buffer size of the pipe, we will * deadlock here. */ for (i = 1; i < max_tokens; i++) JobTokenAdd(); } /*- *----------------------------------------------------------------------- * Job_TokenReturn -- * Return a withdrawn token to the pool. * *----------------------------------------------------------------------- */ void Job_TokenReturn(void) { jobTokensRunning--; if (jobTokensRunning < 0) Punt("token botch"); if (jobTokensRunning || JOB_TOKENS[aborting] != '+') JobTokenAdd(); } /*- *----------------------------------------------------------------------- * Job_TokenWithdraw -- * Attempt to withdraw a token from the pool. * * Results: * Returns TRUE if a token was withdrawn, and FALSE if the pool * is currently empty. * * Side Effects: * If pool is empty, set wantToken so that we wake up * when a token is released. * *----------------------------------------------------------------------- */ Boolean Job_TokenWithdraw(void) { char tok, tok1; int count; wantToken = 0; if (DEBUG(JOB)) fprintf(debug_file, "Job_TokenWithdraw(%d): aborting %d, running %d\n", getpid(), aborting, jobTokensRunning); if (aborting || (jobTokensRunning >= maxJobs)) return FALSE; count = read(tokenWaitJob.inPipe, &tok, 1); if (count == 0) Fatal("eof on job pipe!"); if (count < 0 && jobTokensRunning != 0) { if (errno != EAGAIN) { Fatal("job pipe read: %s", strerror(errno)); } if (DEBUG(JOB)) fprintf(debug_file, "(%d) blocked for token\n", getpid()); wantToken = 1; return FALSE; } if (count == 1 && tok != '+') { /* make being abvorted - remove any other job tokens */ if (DEBUG(JOB)) fprintf(debug_file, "(%d) aborted by token %c\n", getpid(), tok); while (read(tokenWaitJob.inPipe, &tok1, 1) == 1) continue; /* And put the stopper back */ write(tokenWaitJob.outPipe, &tok, 1); Fatal("A failure has been detected in another branch of the parallel make"); } if (count == 1 && jobTokensRunning == 0) /* We didn't want the token really */ write(tokenWaitJob.outPipe, &tok, 1); jobTokensRunning++; if (DEBUG(JOB)) fprintf(debug_file, "(%d) withdrew token\n", getpid()); return TRUE; } #ifdef USE_SELECT int emul_poll(struct pollfd *fd, int nfd, int timeout) { fd_set rfds, wfds; int i, maxfd, nselect, npoll; struct timeval tv, *tvp; long usecs; FD_ZERO(&rfds); FD_ZERO(&wfds); maxfd = -1; for (i = 0; i < nfd; i++) { fd[i].revents = 0; if (fd[i].events & POLLIN) FD_SET(fd[i].fd, &rfds); if (fd[i].events & POLLOUT) FD_SET(fd[i].fd, &wfds); if (fd[i].fd > maxfd) maxfd = fd[i].fd; } if (maxfd >= FD_SETSIZE) { Punt("Ran out of fd_set slots; " "recompile with a larger FD_SETSIZE."); } if (timeout < 0) { tvp = NULL; } else { usecs = timeout * 1000; tv.tv_sec = usecs / 1000000; tv.tv_usec = usecs % 1000000; tvp = &tv; } nselect = select(maxfd + 1, &rfds, &wfds, 0, tvp); if (nselect <= 0) return nselect; npoll = 0; for (i = 0; i < nfd; i++) { if (FD_ISSET(fd[i].fd, &rfds)) fd[i].revents |= POLLIN; if (FD_ISSET(fd[i].fd, &wfds)) fd[i].revents |= POLLOUT; if (fd[i].revents) npoll++; } return npoll; } #endif /* USE_SELECT */