/* $NetBSD: job.c,v 1.432 2021/04/27 16:25:46 rillig 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. */ /* * job.c -- * handle the creation etc. of our child processes. * * Interface: * Job_Init Called to initialize this module. In addition, * the .BEGIN target is made including all of its * dependencies before this function returns. * Hence, the makefiles must have been parsed * before this function is called. * * Job_End Clean up any memory used. * * 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_ParseShell Given a special dependency line with target '.SHELL', * define the shell that is used for the creation * commands in jobs mode. * * 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. Do not handle * output or do anything for the jobs, just kill them. * Should only be called in an emergency. * * 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 #ifndef USE_SELECT #include #endif #include #include #include "make.h" #include "dir.h" #include "job.h" #include "pathnames.h" #include "trace.h" /* "@(#)job.c 8.2 (Berkeley) 3/19/94" */ MAKE_RCSID("$NetBSD: job.c,v 1.432 2021/04/27 16:25:46 rillig Exp $"); /* * A shell defines how the commands are run. All commands for a target are * written into a single file, which is then given to the shell to execute * the commands from it. The commands are written to the file using a few * templates for echo control and error control. * * The name of the shell is the basename for the predefined shells, such as * "sh", "csh", "bash". For custom shells, it is the full pathname, and its * basename is used to select the type of shell; the longest match wins. * So /usr/pkg/bin/bash has type sh, /usr/local/bin/tcsh has type csh. * * The echoing of command lines is controlled using hasEchoCtl, echoOff, * echoOn, noPrint and noPrintLen. When echoOff is executed by the shell, it * still outputs something, but this something is not interesting, therefore * it is filtered out using noPrint and noPrintLen. * * The error checking for individual commands is controlled using hasErrCtl, * errOn, errOff and runChkTmpl. * * In case a shell doesn't have error control, echoTmpl is a printf template * for echoing the command, should echoing be on; runIgnTmpl is another * printf template for executing the command while ignoring the return * status. Finally runChkTmpl is a printf template for running the command and * causing the shell to exit on error. If any of these strings are empty when * hasErrCtl is false, the command will be executed anyway as is, and if it * causes an error, so be it. Any templates set up to echo the command will * escape any '$ ` \ "' characters in the command string to avoid unwanted * shell code injection, the escaped command is safe to use in double quotes. * * The command-line flags "echo" and "exit" also control the behavior. The * "echo" flag causes the shell to start echoing commands right away. The * "exit" flag causes the shell to exit when an error is detected in one of * the commands. */ typedef struct Shell { /* * The name of the shell. For Bourne and C shells, this is used only * to find the shell description when used as the single source of a * .SHELL target. For user-defined shells, this is the full path of * the shell. */ const char *name; bool hasEchoCtl; /* whether both echoOff and echoOn are there */ const char *echoOff; /* command to turn echoing off */ const char *echoOn; /* command to turn echoing back on */ const char *noPrint; /* text to skip when printing output from the * shell. This is usually the same as echoOff */ size_t noPrintLen; /* length of noPrint command */ bool hasErrCtl; /* whether error checking can be controlled * for individual commands */ const char *errOn; /* command to turn on error checking */ const char *errOff; /* command to turn off error checking */ const char *echoTmpl; /* template to echo a command */ const char *runIgnTmpl; /* template to run a command * without error checking */ const char *runChkTmpl; /* template to run a command * with error checking */ /* string literal that results in a newline character when it appears * outside of any 'quote' or "quote" characters */ const char *newline; char commentChar; /* character used by shell for comment lines */ const char *echoFlag; /* shell flag to echo commands */ const char *errFlag; /* shell flag to exit on error */ } Shell; typedef struct CommandFlags { /* Whether to echo the command before or instead of running it. */ bool echo; /* Run the command even in -n or -N mode. */ bool always; /* * true if we turned error checking off before writing the command to * the commands file and need to turn it back on */ bool ignerr; } CommandFlags; /* * Write shell commands to a file. * * TODO: keep track of whether commands are echoed. * TODO: keep track of whether error checking is active. */ typedef struct ShellWriter { FILE *f; /* we've sent 'set -x' */ bool xtraced; } ShellWriter; /* * error handling variables */ static int job_errors = 0; /* number of errors reported */ static enum { /* Why is the make aborting? */ ABORT_NONE, ABORT_ERROR, /* Aborted because of an error */ ABORT_INTERRUPT, /* Aborted because it was interrupted */ ABORT_WAIT /* Waiting for jobs to finish */ } aborting = ABORT_NONE; #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; typedef enum JobStartResult { JOB_RUNNING, /* Job is running */ JOB_ERROR, /* Error in starting the job */ JOB_FINISHED /* The job is already finished */ } JobStartResult; /* * 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 predefined 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, /* .name */ false, /* .hasEchoCtl */ "", /* .echoOff */ "", /* .echoOn */ "", /* .noPrint */ 0, /* .noPrintLen */ false, /* .hasErrCtl */ "", /* .errOn */ "", /* .errOff */ "echo \"%s\"\n", /* .echoTmpl */ "%s\n", /* .runIgnTmpl */ "{ %s \n} || exit $?\n", /* .runChkTmpl */ "'\n'", /* .newline */ '#', /* .commentChar */ "", /* .echoFlag */ "", /* .errFlag */ }, #endif /* DEFSHELL_CUSTOM */ /* * SH description. Echo control is also possible and, under * sun UNIX anyway, one can even control error checking. */ { "sh", /* .name */ false, /* .hasEchoCtl */ "", /* .echoOff */ "", /* .echoOn */ "", /* .noPrint */ 0, /* .noPrintLen */ false, /* .hasErrCtl */ "", /* .errOn */ "", /* .errOff */ "echo \"%s\"\n", /* .echoTmpl */ "%s\n", /* .runIgnTmpl */ "{ %s \n} || exit $?\n", /* .runChkTmpl */ "'\n'", /* .newline */ '#', /* .commentChar*/ #if defined(MAKE_NATIVE) && defined(__NetBSD__) /* XXX: -q is not really echoFlag, it's more like noEchoInSysFlag. */ "q", /* .echoFlag */ #else "", /* .echoFlag */ #endif "", /* .errFlag */ }, /* * KSH description. */ { "ksh", /* .name */ true, /* .hasEchoCtl */ "set +v", /* .echoOff */ "set -v", /* .echoOn */ "set +v", /* .noPrint */ 6, /* .noPrintLen */ false, /* .hasErrCtl */ "", /* .errOn */ "", /* .errOff */ "echo \"%s\"\n", /* .echoTmpl */ "%s\n", /* .runIgnTmpl */ "{ %s \n} || exit $?\n", /* .runChkTmpl */ "'\n'", /* .newline */ '#', /* .commentChar */ "v", /* .echoFlag */ "", /* .errFlag */ }, /* * 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", /* .name */ true, /* .hasEchoCtl */ "unset verbose", /* .echoOff */ "set verbose", /* .echoOn */ "unset verbose", /* .noPrint */ 13, /* .noPrintLen */ false, /* .hasErrCtl */ "", /* .errOn */ "", /* .errOff */ "echo \"%s\"\n", /* .echoTmpl */ "csh -c \"%s || exit 0\"\n", /* .runIgnTmpl */ "", /* .runChkTmpl */ "'\\\n'", /* .newline */ '#', /* .commentChar */ "v", /* .echoFlag */ "e", /* .errFlag */ } }; /* * This is the shell to which we pass all commands in the Makefile. * It is set by the Job_ParseShell function. */ static Shell *shell = &shells[DEFSHELL_INDEX]; const char *shellPath = NULL; /* full pathname of executable image */ const char *shellName = NULL; /* last component of shellPath */ char *shellErrFlag = NULL; static char *shell_freeIt = NULL; /* Allocated memory for custom .SHELL */ static Job *job_table; /* The structures that describe them */ static Job *job_table_end; /* job_table + maxJobs */ static unsigned int wantToken; /* we want a token */ static bool lurking_children = false; static bool make_suspended = false; /* Whether 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 **jobByFdIndex = NULL; static nfds_t fdsLen = 0; static void watchfd(Job *); static void clearfd(Job *); static bool readyfd(Job *); static char *targPrefix = NULL; /* To identify a job change in the output. */ static Job tokenWaitJob; /* token wait pseudo-job */ static Job childExitJob; /* child exit pseudo-job */ #define CHILD_EXIT "." #define DO_JOB_RESUME "R" enum { npseudojobs = 2 /* number of pseudo-jobs */ }; static sigset_t caught_signals; /* Set of signals we handle */ static volatile sig_atomic_t caught_sigchld; static void CollectOutput(Job *, bool); static void JobInterrupt(bool, int) MAKE_ATTR_DEAD; static void JobRestartJobs(void); static void JobSigReset(void); static void SwitchOutputTo(GNode *gn) { /* The node for which output was most recently produced. */ static GNode *lastNode = NULL; if (gn == lastNode) return; lastNode = gn; if (opts.maxJobs != 1 && targPrefix != NULL && targPrefix[0] != '\0') (void)fprintf(stdout, "%s %s ---\n", targPrefix, gn->name); } static unsigned nfds_per_job(void) { #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) if (useMeta) return 2; #endif return 1; } void Job_FlagsToString(const Job *job, char *buf, size_t bufsize) { snprintf(buf, bufsize, "%c%c%c", job->ignerr ? 'i' : '-', !job->echo ? 's' : '-', job->special ? 'S' : '-'); } static void DumpJobs(const char *where) { Job *job; char flags[4]; debug_printf("job table @ %s\n", where); for (job = job_table; job < job_table_end; job++) { Job_FlagsToString(job, flags, sizeof flags); debug_printf("job %d, status %d, flags %s, pid %d\n", (int)(job - job_table), job->status, flags, job->pid); } } /* * Delete the target of a failed, interrupted, or otherwise * unsuccessful job unless inhibited by .PRECIOUS. */ static void JobDeleteTarget(GNode *gn) { const char *file; if (gn->type & OP_JOIN) return; if (gn->type & OP_PHONY) return; if (Targ_Precious(gn)) return; if (opts.noExecute) return; file = GNode_Path(gn); if (eunlink(file) != -1) Error("*** %s removed", file); } /* * 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, flags; int pipe_fds[2]; if (pipe(pipe_fds) == -1) Punt("Cannot create pipe: %s", strerror(errno)); for (i = 0; i < 2; i++) { /* Avoid using low numbered fds */ fd = fcntl(pipe_fds[i], F_DUPFD, minfd); if (fd != -1) { close(pipe_fds[i]); pipe_fds[i] = fd; } } job->inPipe = pipe_fds[0]; job->outPipe = pipe_fds[1]; /* Set close-on-exec flag for both */ if (fcntl(job->inPipe, F_SETFD, FD_CLOEXEC) == -1) Punt("Cannot set close-on-exec: %s", strerror(errno)); if (fcntl(job->outPipe, F_SETFD, FD_CLOEXEC) == -1) Punt("Cannot set close-on-exec: %s", strerror(errno)); /* * 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. */ flags = fcntl(job->inPipe, F_GETFL, 0); if (flags == -1) Punt("Cannot get flags: %s", strerror(errno)); flags |= O_NONBLOCK; if (fcntl(job->inPipe, F_SETFL, flags) == -1) Punt("Cannot set flags: %s", strerror(errno)); } /* Pass the signal to each running job. */ static void JobCondPassSig(int signo) { Job *job; DEBUG1(JOB, "JobCondPassSig(%d) called.\n", signo); for (job = job_table; job < job_table_end; job++) { if (job->status != JOB_ST_RUNNING) continue; DEBUG2(JOB, "JobCondPassSig passing signal %d to child %d.\n", signo, job->pid); KILLPG(job->pid, signo); } } /* * SIGCHLD handler. * * Sends a token on the child exit pipe to wake us up from select()/poll(). */ /*ARGSUSED*/ static void JobChildSig(int signo MAKE_ATTR_UNUSED) { caught_sigchld = 1; while (write(childExitJob.outPipe, CHILD_EXIT, 1) == -1 && errno == EAGAIN) continue; } /* Resume all stopped jobs. */ /*ARGSUSED*/ static void JobContinueSig(int signo MAKE_ATTR_UNUSED) { /* * Defer sending SIGCONT to our stopped children until we return * from the signal handler. */ while (write(childExitJob.outPipe, DO_JOB_RESUME, 1) == -1 && errno == EAGAIN) continue; } /* * Pass a signal on to all jobs, then resend to ourselves. * We die by the same signal. */ MAKE_ATTR_DEAD static void JobPassSig_int(int signo) { /* Run .INTERRUPT target then exit */ JobInterrupt(true, signo); } /* * Pass a signal on to all jobs, then resend to ourselves. * We die by the same signal. */ MAKE_ATTR_DEAD 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 = true; /* 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); DEBUG1(JOB, "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 passing 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); } static Job * JobFindPid(int pid, JobStatus status, bool isJobs) { Job *job; for (job = job_table; job < job_table_end; job++) { if (job->status == status && job->pid == pid) return job; } if (DEBUG(JOB) && isJobs) DumpJobs("no pid"); return NULL; } /* Parse leading '@', '-' and '+', which control the exact execution mode. */ static void ParseCommandFlags(char **pp, CommandFlags *out_cmdFlags) { char *p = *pp; out_cmdFlags->echo = true; out_cmdFlags->ignerr = false; out_cmdFlags->always = false; for (;;) { if (*p == '@') out_cmdFlags->echo = DEBUG(LOUD); else if (*p == '-') out_cmdFlags->ignerr = true; else if (*p == '+') out_cmdFlags->always = true; else break; p++; } pp_skip_whitespace(&p); *pp = p; } /* Escape a string for a double-quoted string literal in sh, csh and ksh. */ static char * EscapeShellDblQuot(const char *cmd) { size_t i, j; /* Worst that could happen is every char needs escaping. */ char *esc = 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] == '"') esc[j++] = '\\'; esc[j] = cmd[i]; } esc[j] = '\0'; return esc; } static void ShellWriter_WriteFmt(ShellWriter *wr, const char *fmt, const char *arg) { DEBUG1(JOB, fmt, arg); (void)fprintf(wr->f, fmt, arg); /* XXX: Is flushing needed in any case, or only if f == stdout? */ (void)fflush(wr->f); } static void ShellWriter_WriteLine(ShellWriter *wr, const char *line) { ShellWriter_WriteFmt(wr, "%s\n", line); } static void ShellWriter_EchoOff(ShellWriter *wr) { if (shell->hasEchoCtl) ShellWriter_WriteLine(wr, shell->echoOff); } static void ShellWriter_EchoCmd(ShellWriter *wr, const char *escCmd) { ShellWriter_WriteFmt(wr, shell->echoTmpl, escCmd); } static void ShellWriter_EchoOn(ShellWriter *wr) { if (shell->hasEchoCtl) ShellWriter_WriteLine(wr, shell->echoOn); } static void ShellWriter_TraceOn(ShellWriter *wr) { if (!wr->xtraced) { ShellWriter_WriteLine(wr, "set -x"); wr->xtraced = true; } } static void ShellWriter_ErrOff(ShellWriter *wr, bool echo) { if (echo) ShellWriter_EchoOff(wr); ShellWriter_WriteLine(wr, shell->errOff); if (echo) ShellWriter_EchoOn(wr); } static void ShellWriter_ErrOn(ShellWriter *wr, bool echo) { if (echo) ShellWriter_EchoOff(wr); ShellWriter_WriteLine(wr, shell->errOn); if (echo) ShellWriter_EchoOn(wr); } /* * The shell has no built-in error control, so emulate error control by * enclosing each shell command in a template like "{ %s \n } || exit $?" * (configurable per shell). */ static void JobWriteSpecialsEchoCtl(Job *job, ShellWriter *wr, CommandFlags *inout_cmdFlags, const char *escCmd, const char **inout_cmdTemplate) { /* XXX: Why is the job modified at this point? */ job->ignerr = true; if (job->echo && inout_cmdFlags->echo) { ShellWriter_EchoOff(wr); ShellWriter_EchoCmd(wr, escCmd); /* * Leave echoing off so the user doesn't see the commands * for toggling the error checking. */ inout_cmdFlags->echo = false; } else { if (inout_cmdFlags->echo) ShellWriter_EchoCmd(wr, escCmd); } *inout_cmdTemplate = shell->runIgnTmpl; /* * The template runIgnTmpl already takes care of ignoring errors, * so pretend error checking is still on. * XXX: What effects does this have, and why is it necessary? */ inout_cmdFlags->ignerr = false; } static void JobWriteSpecials(Job *job, ShellWriter *wr, const char *escCmd, bool run, CommandFlags *inout_cmdFlags, const char **inout_cmdTemplate) { if (!run) { /* * If there is no command to run, there is no need to switch * error checking off and on again for nothing. */ inout_cmdFlags->ignerr = false; } else if (shell->hasErrCtl) ShellWriter_ErrOff(wr, job->echo && inout_cmdFlags->echo); else if (shell->runIgnTmpl != NULL && shell->runIgnTmpl[0] != '\0') { JobWriteSpecialsEchoCtl(job, wr, inout_cmdFlags, escCmd, inout_cmdTemplate); } else inout_cmdFlags->ignerr = false; } /* * Write a shell command to the job's commands file, to be run later. * * If the command starts with '@' and neither the -s nor the -n flag was * given to make, stick a shell-specific echoOff command in the script. * * If the command starts with '-' and the shell has no error control (none * of the predefined shells has that), ignore errors for the entire job. * * XXX: Why ignore errors for the entire job? This is even documented in the * manual page, but without any rationale since there is no known rationale. * * XXX: The manual page says the '-' "affects the entire job", but that's not * accurate. The '-' does not affect the commands before the '-'. * * If the command is just "...", skip all further commands of this job. These * commands are attached to the .END node instead and will be run by * Job_Finish after all other targets have been made. */ static void JobWriteCommand(Job *job, ShellWriter *wr, StringListNode *ln, const char *ucmd) { bool run; CommandFlags cmdFlags; /* Template for writing a command to the shell file */ const char *cmdTemplate; char *xcmd; /* The expanded command */ char *xcmdStart; char *escCmd; /* xcmd escaped to be used in double quotes */ run = GNode_ShouldExecute(job->node); Var_Subst(ucmd, job->node, VARE_WANTRES, &xcmd); /* TODO: handle errors */ xcmdStart = xcmd; cmdTemplate = "%s\n"; ParseCommandFlags(&xcmd, &cmdFlags); /* The '+' command flag overrides the -n or -N options. */ if (cmdFlags.always && !run) { /* * We're not actually executing anything... * but this one needs to be - use compat mode just for it. */ Compat_RunCommand(ucmd, job->node, ln); free(xcmdStart); return; } /* * If the shell doesn't have error control, the alternate echoing * will be done (to avoid showing additional error checking code) * and this needs some characters escaped. */ escCmd = shell->hasErrCtl ? NULL : EscapeShellDblQuot(xcmd); if (!cmdFlags.echo) { if (job->echo && run && shell->hasEchoCtl) { ShellWriter_EchoOff(wr); } else { if (shell->hasErrCtl) cmdFlags.echo = true; } } if (cmdFlags.ignerr) { JobWriteSpecials(job, wr, escCmd, run, &cmdFlags, &cmdTemplate); } else { /* * If errors are being checked and the shell doesn't have * error control but does supply an runChkTmpl template, then * set up commands to run through it. */ if (!shell->hasErrCtl && shell->runChkTmpl != NULL && shell->runChkTmpl[0] != '\0') { if (job->echo && cmdFlags.echo) { ShellWriter_EchoOff(wr); ShellWriter_EchoCmd(wr, escCmd); cmdFlags.echo = false; } /* * If it's a comment line or blank, avoid the possible * syntax error generated by "{\n} || exit $?". */ cmdTemplate = escCmd[0] == shell->commentChar || escCmd[0] == '\0' ? shell->runIgnTmpl : shell->runChkTmpl; cmdFlags.ignerr = false; } } if (DEBUG(SHELL) && strcmp(shellName, "sh") == 0) ShellWriter_TraceOn(wr); ShellWriter_WriteFmt(wr, cmdTemplate, xcmd); free(xcmdStart); free(escCmd); if (cmdFlags.ignerr) ShellWriter_ErrOn(wr, cmdFlags.echo && job->echo); if (!cmdFlags.echo) ShellWriter_EchoOn(wr); } /* * Write all commands to the shell file that is later executed. * * The special command "..." stops writing and saves the remaining commands * to be executed later, when the target '.END' is made. * * Return whether at least one command was written to the shell file. */ static bool JobWriteCommands(Job *job) { StringListNode *ln; bool seen = false; ShellWriter wr; wr.f = job->cmdFILE; wr.xtraced = false; for (ln = job->node->commands.first; ln != NULL; ln = ln->next) { const char *cmd = ln->datum; if (strcmp(cmd, "...") == 0) { job->node->type |= OP_SAVE_CMDS; job->tailCmds = ln->next; break; } JobWriteCommand(job, &wr, ln, ln->datum); seen = true; } return seen; } /* * Save the delayed commands (those after '...'), to be executed later in * the '.END' node, when everything else is done. */ static void JobSaveCommands(Job *job) { StringListNode *ln; for (ln = job->tailCmds; ln != NULL; ln = ln->next) { const char *cmd = ln->datum; char *expanded_cmd; /* * XXX: This Var_Subst is only intended to expand the dynamic * variables such as .TARGET, .IMPSRC. It is not intended to * expand the other variables as well; see deptgt-end.mk. */ (void)Var_Subst(cmd, job->node, VARE_WANTRES, &expanded_cmd); /* TODO: handle errors */ Lst_Append(&Targ_GetEndNode()->commands, expanded_cmd); } } /* Called to close both input and output pipes when a job is finished. */ static void JobClosePipes(Job *job) { clearfd(job); (void)close(job->outPipe); job->outPipe = -1; CollectOutput(job, true); (void)close(job->inPipe); job->inPipe = -1; } static void DebugFailedJob(const Job *job) { const StringListNode *ln; if (!DEBUG(ERROR)) return; debug_printf("\n*** Failed target: %s\n*** Failed commands:\n", job->node->name); for (ln = job->node->commands.first; ln != NULL; ln = ln->next) debug_printf("\t%s\n", (const char *)ln->datum); } static void JobFinishDoneExitedError(Job *job, int *inout_status) { SwitchOutputTo(job->node); #ifdef USE_META if (useMeta) { meta_job_error(job, job->node, job->ignerr, WEXITSTATUS(*inout_status)); } #endif if (!shouldDieQuietly(job->node, -1)) { DebugFailedJob(job); (void)printf("*** [%s] Error code %d%s\n", job->node->name, WEXITSTATUS(*inout_status), job->ignerr ? " (ignored)" : ""); } if (job->ignerr) *inout_status = 0; else { if (deleteOnError) JobDeleteTarget(job->node); PrintOnError(job->node, NULL); } } static void JobFinishDoneExited(Job *job, int *inout_status) { DEBUG2(JOB, "Process %d [%s] exited.\n", job->pid, job->node->name); if (WEXITSTATUS(*inout_status) != 0) JobFinishDoneExitedError(job, inout_status); else if (DEBUG(JOB)) { SwitchOutputTo(job->node); (void)printf("*** [%s] Completed successfully\n", job->node->name); } } static void JobFinishDoneSignaled(Job *job, int status) { SwitchOutputTo(job->node); DebugFailedJob(job); (void)printf("*** [%s] Signal %d\n", job->node->name, WTERMSIG(status)); if (deleteOnError) JobDeleteTarget(job->node); } static void JobFinishDone(Job *job, int *inout_status) { if (WIFEXITED(*inout_status)) JobFinishDoneExited(job, inout_status); else JobFinishDoneSignaled(job, *inout_status); (void)fflush(stdout); } /* * Do final processing for the given job including updating parent nodes and * starting new jobs as available/necessary. * * Deferred commands for the job are placed on the .END node. * * If there was a serious error (job_errors != 0; not an ignored one), no more * jobs will be started. * * Input: * job job to finish * status sub-why job went away */ static void JobFinish(Job *job, int status) { bool done, return_job_token; DEBUG3(JOB, "JobFinish: %d [%s], status %d\n", job->pid, job->node->name, status); if ((WIFEXITED(status) && ((WEXITSTATUS(status) != 0 && !job->ignerr))) || WIFSIGNALED(status)) { /* Finished because of an error. */ JobClosePipes(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 to run * the next command. */ done = WEXITSTATUS(status) != 0; JobClosePipes(job); } else { /* No need to close things down or anything. */ done = false; } if (done) JobFinishDone(job, &status); #ifdef USE_META if (useMeta) { int meta_status = meta_job_finish(job); if (meta_status != 0 && status == 0) status = meta_status; } #endif return_job_token = false; Trace_Log(JOBEND, job); if (!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. */ JobSaveCommands(job); job->node->made = MADE; if (!job->special) return_job_token = true; Make_Update(job->node); job->status = JOB_ST_FREE; } else if (status != 0) { job_errors++; job->status = JOB_ST_FREE; } if (job_errors > 0 && !opts.keepgoing && aborting != ABORT_INTERRUPT) { /* Prevent more jobs from getting started. */ aborting = ABORT_ERROR; } if (return_job_token) Job_TokenReturn(); if (aborting == ABORT_ERROR && jobTokensRunning == 0) Finish(job_errors); } static void TouchRegular(GNode *gn) { const char *file = GNode_Path(gn); struct utimbuf times; int fd; char c; times.actime = now; times.modtime = now; if (utime(file, ×) >= 0) return; fd = open(file, O_RDWR | O_CREAT, 0666); if (fd < 0) { (void)fprintf(stderr, "*** couldn't touch %s: %s\n", file, strerror(errno)); (void)fflush(stderr); return; /* XXX: What about propagating the error? */ } /* Last resort: update the file's time stamps in the traditional way. * XXX: This doesn't work for empty files, which are sometimes used * as marker files. */ if (read(fd, &c, 1) == 1) { (void)lseek(fd, 0, SEEK_SET); while (write(fd, &c, 1) == -1 && errno == EAGAIN) continue; } (void)close(fd); /* XXX: What about propagating the error? */ } /* * Touch the given target. Called by JobStart when the -t flag was given. * * The modification date of the file is changed. * If the file did not exist, it is created. */ void Job_Touch(GNode *gn, bool echo) { if (gn->type & (OP_JOIN | OP_USE | OP_USEBEFORE | OP_EXEC | OP_OPTIONAL | OP_SPECIAL | OP_PHONY)) { /* * These are "virtual" targets and should not really be * created. */ return; } if (echo || !GNode_ShouldExecute(gn)) { (void)fprintf(stdout, "touch %s\n", gn->name); (void)fflush(stdout); } if (!GNode_ShouldExecute(gn)) return; if (gn->type & OP_ARCHV) Arch_Touch(gn); else if (gn->type & OP_LIB) Arch_TouchLib(gn); else TouchRegular(gn); } /* * Make sure the given node has all the commands it needs. * * The node will have commands from the .DEFAULT rule added to it if it * needs them. * * Input: * gn The target whose commands need verifying * abortProc Function to abort with message * * Results: * true if the commands list is/was ok. */ bool Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...)) { if (GNode_IsTarget(gn)) return true; if (!Lst_IsEmpty(&gn->commands)) return true; if ((gn->type & OP_LIB) && !Lst_IsEmpty(&gn->children)) return true; /* * No commands. Look for .DEFAULT rule from which we might infer * commands. */ if (defaultNode != NULL && !Lst_IsEmpty(&defaultNode->commands) && !(gn->type & OP_SPECIAL)) { /* * The traditional Make only looks for a .DEFAULT if the node * was never the target of an operator, so that's what we do * too. * * The .DEFAULT node acts like a transformation rule, in that * gn also inherits any attributes or sources attached to * .DEFAULT itself. */ Make_HandleUse(defaultNode, gn); Var_Set(gn, IMPSRC, GNode_VarTarget(gn)); return true; } Dir_UpdateMTime(gn, false); if (gn->mtime != 0 || (gn->type & OP_SPECIAL)) return true; /* * 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. */ if (gn->flags & FROM_DEPEND) { if (!Job_RunTarget(".STALE", gn->fname)) fprintf(stdout, "%s: %s, %d: ignoring stale %s for %s\n", progname, gn->fname, gn->lineno, makeDependfile, gn->name); return true; } if (gn->type & OP_OPTIONAL) { (void)fprintf(stdout, "%s: don't know how to make %s (%s)\n", progname, gn->name, "ignored"); (void)fflush(stdout); return true; } if (opts.keepgoing) { (void)fprintf(stdout, "%s: don't know how to make %s (%s)\n", progname, gn->name, "continuing"); (void)fflush(stdout); return false; } abortProc("%s: don't know how to make %s. Stop", progname, gn->name); return false; } /* * Execute the shell for the given job. * * See Job_CatchOutput for handling the output of the shell. */ static void JobExec(Job *job, char **argv) { int cpid; /* ID of new child */ sigset_t mask; if (DEBUG(JOB)) { int i; debug_printf("Running %s\n", job->node->name); debug_printf("\tCommand: "); for (i = 0; argv[i] != NULL; i++) { debug_printf("%s ", argv[i]); } debug_printf("\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 (job->echo) SwitchOutputTo(job->node); /* No interruptions until this job is on the `jobs' list */ JobSigLock(&mask); /* Pre-emptively mark job running, pid still zero though */ job->status = JOB_ST_RUNNING; Var_ReexportVars(); 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) execDie("dup2", "job->cmdFILE"); if (fcntl(0, F_SETFD, 0) == -1) execDie("fcntl clear close-on-exec", "stdin"); if (lseek(0, 0, SEEK_SET) == -1) execDie("lseek to 0", "stdin"); if (job->node->type & (OP_MAKE | OP_SUBMAKE)) { /* * Pass job token pipe to submakes. */ if (fcntl(tokenWaitJob.inPipe, F_SETFD, 0) == -1) execDie("clear close-on-exec", "tokenWaitJob.inPipe"); if (fcntl(tokenWaitJob.outPipe, F_SETFD, 0) == -1) execDie("clear close-on-exec", "tokenWaitJob.outPipe"); } /* * Set up the child's output to be routed through the pipe * we've created for it. */ if (dup2(job->outPipe, 1) == -1) execDie("dup2", "job->outPipe"); /* * 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. */ if (fcntl(1, F_SETFD, 0) == -1) execDie("clear close-on-exec", "stdout"); if (dup2(1, 2) == -1) execDie("dup2", "1, 2"); /* * 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(MAKE_NATIVE) || defined(HAVE_SETPGID) # if defined(SYSV) /* XXX: dsl - I'm sure this should be setpgrp()... */ (void)setsid(); # else (void)setpgid(0, getpid()); # endif #endif (void)execv(shellPath, argv); execDie("exec", shellPath); } /* Parent, continuing after the child exec */ job->pid = cpid; Trace_Log(JOBSTART, job); #ifdef USE_META if (useMeta) { meta_job_parent(job, cpid); } #endif /* * 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 that the job is actually running, add it to the table. */ if (DEBUG(JOB)) { debug_printf("JobExec(%s): pid %d added to jobs table\n", job->node->name, job->pid); DumpJobs("job started"); } JobSigUnlock(&mask); } /* Create the argv needed to execute the shell for a given job. */ static void JobMakeArgv(Job *job, char **argv) { int argc; static char args[10]; /* For merged arguments */ argv[0] = UNCONST(shellName); argc = 1; if ((shell->errFlag != NULL && shell->errFlag[0] != '-') || (shell->echoFlag != NULL && shell->echoFlag[0] != '-')) { /* * 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. * * TODO: Research until when the above comments were * practically relevant. */ (void)snprintf(args, sizeof args, "-%s%s", (job->ignerr ? "" : (shell->errFlag != NULL ? shell->errFlag : "")), (!job->echo ? "" : (shell->echoFlag != NULL ? shell->echoFlag : ""))); if (args[1] != '\0') { argv[argc] = args; argc++; } } else { if (!job->ignerr && shell->errFlag != NULL) { argv[argc] = UNCONST(shell->errFlag); argc++; } if (job->echo && shell->echoFlag != NULL) { argv[argc] = UNCONST(shell->echoFlag); argc++; } } argv[argc] = NULL; } static void JobWriteShellCommands(Job *job, GNode *gn, bool cmdsOK, bool *out_run) { /* * 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[MAXPATHLEN]; int tfd; /* File descriptor to the temp file */ /* * We're serious here, but if the commands were bogus, we're * also dead... */ if (!cmdsOK) { PrintOnError(gn, NULL); /* provide some clue */ DieHorribly(); } tfd = Job_TempFile(TMPPAT, tfile, sizeof tfile); job->cmdFILE = fdopen(tfd, "w+"); if (job->cmdFILE == NULL) Punt("Could not fdopen %s", tfile); (void)fcntl(fileno(job->cmdFILE), F_SETFD, FD_CLOEXEC); #ifdef USE_META if (useMeta) { meta_job_start(job, gn); if (gn->type & OP_SILENT) /* might have changed */ job->echo = false; } #endif *out_run = JobWriteCommands(job); } /* * 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. * 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: The return value is ignored by everyone. */ static JobStartResult JobStart(GNode *gn, bool special) { Job *job; /* new job descriptor */ char *argv[10]; /* Argument vector to shell */ bool cmdsOK; /* true if the nodes commands were all right */ bool run; for (job = job_table; job < job_table_end; job++) { if (job->status == JOB_ST_FREE) break; } if (job >= job_table_end) Punt("JobStart no job slots vacant"); memset(job, 0, sizeof *job); job->node = gn; job->tailCmds = NULL; job->status = JOB_ST_SET_UP; job->special = special || gn->type & OP_SPECIAL; job->ignerr = opts.ignoreErrors || gn->type & OP_IGNORE; job->echo = !(opts.beSilent || gn->type & OP_SILENT); /* * 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 (Lst_IsEmpty(&gn->commands)) { job->cmdFILE = stdout; run = false; } else if (((gn->type & OP_MAKE) && !opts.noRecursiveExecute) || (!opts.noExecute && !opts.touchFlag)) { /* * The above condition looks very similar to * GNode_ShouldExecute but is subtly different. It prevents * that .MAKE targets are touched since these are usually * virtual targets. */ JobWriteShellCommands(job, gn, cmdsOK, &run); (void)fflush(job->cmdFILE); } else if (!GNode_ShouldExecute(gn)) { /* * Just write all the commands to stdout in one fell swoop. * This still sets up job->tailCmds correctly. */ SwitchOutputTo(gn); job->cmdFILE = stdout; if (cmdsOK) JobWriteCommands(job); run = false; (void)fflush(job->cmdFILE); } else { Job_Touch(gn, job->echo); run = false; } /* If we're not supposed to execute a shell, don't. */ if (!run) { if (!job->special) Job_TokenReturn(); /* Unlink and close the command file if we opened one */ if (job->cmdFILE != NULL && job->cmdFILE != stdout) { (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 == ABORT_NONE) { JobSaveCommands(job); job->node->made = MADE; Make_Update(job->node); } job->status = 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; } /* * If the shell has an output filter (which only csh and ksh have by default), * print the output of the child process, skipping the noPrint text of the * shell. * * Return the part of the output that the calling function needs to output by * itself. */ static char * PrintFilteredOutput(char *cp, char *endp) /* XXX: should all be const */ { char *ecp; /* XXX: should be const */ if (shell->noPrint == NULL || shell->noPrint[0] == '\0') return cp; /* * XXX: What happens if shell->noPrint occurs on the boundary of * the buffer? To work correctly in all cases, this should rather * be a proper stream filter instead of doing string matching on * selected chunks of the output. */ while ((ecp = strstr(cp, shell->noPrint)) != NULL) { if (ecp != cp) { *ecp = '\0'; /* XXX: avoid writing to the buffer */ /* * The only way there wouldn't be a newline after * this line is if it were the last in the buffer. * however, since the noPrint output comes after it, * there must be a newline, so we don't print one. */ /* XXX: What about null bytes in the output? */ (void)fprintf(stdout, "%s", cp); (void)fflush(stdout); } cp = ecp + shell->noPrintLen; if (cp == endp) break; cp++; /* skip over the (XXX: assumed) newline */ pp_skip_whitespace(&cp); } return cp; } /* * This function is 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. * * In the output of the shell, the 'noPrint' lines are removed. 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 */ static void CollectOutput(Job *job, bool finish) { bool gotNL; /* true if got a newline */ bool fbuf; /* true if our buffer filled up */ size_t nr; /* number of bytes read */ size_t i; /* auxiliary index into outBuf */ size_t max; /* limit for i (end of current data) */ ssize_t nRead; /* (Temporary) number of bytes read */ /* Read as many bytes as will fit in the buffer. */ again: 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("CollectOutput(piperead)"); } nr = 0; } else { nr = (size_t)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 != (size_t)-1; i--) { if (job->outBuf[i] == '\n') { gotNL = true; break; } else if (job->outBuf[i] == '\0') { /* * FIXME: The null characters are only replaced with * space _after_ the last '\n'. Everywhere else they * hide the rest of the command output. */ 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; /* * FIXME: SwitchOutputTo should be here, according to * the comment above. But since PrintOutput does not * do anything in the default shell, this bug has gone * unnoticed until now. */ cp = PrintFilteredOutput(job->outBuf, &job->outBuf[i]); /* * There's still more in the output 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 (!opts.beSilent) SwitchOutputTo(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); } } /* * max is the last offset still in the buffer. Move any * remaining characters to the start of the buffer and * update the end marker curPos. */ if (i < max) { (void)memmove(job->outBuf, &job->outBuf[i + 1], max - (i + 1)); job->curPos = max - (i + 1); } else { assert(i == max); 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 again; } } static void JobRun(GNode *targ) { #if 0 /* * Unfortunately it is too complicated to run .BEGIN, .END, and * .INTERRUPT job in the parallel job module. As of 2020-09-25, * unit-tests/deptgt-end-jobs.mk hangs in an endless loop. * * Running these jobs in compat mode also guarantees that these * jobs do not overlap with other unrelated jobs. */ GNodeList lst = LST_INIT; Lst_Append(&lst, targ); (void)Make_Run(&lst); Lst_Done(&lst); JobStart(targ, true); while (jobTokensRunning != 0) { Job_CatchOutput(); } #else Compat_Make(targ, targ); /* XXX: Replace with GNode_IsError(gn) */ if (targ->made == ERROR) { PrintOnError(targ, "\n\nStop."); exit(1); } #endif } /* * Handle the exit of a child. Called from Make_Make. * * 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; /* Have we received SIGCHLD since last call? */ if (caught_sigchld == 0) return; caught_sigchld = 0; while ((pid = waitpid((pid_t)-1, &status, WNOHANG | WUNTRACED)) > 0) { DEBUG2(JOB, "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, bool 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)) { DEBUG2(JOB, "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->suspended = true; } (void)fflush(stdout); return; } job->status = JOB_ST_FINISHED; job->exit_status = status; JobFinish(job, status); } /* * 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. */ void Job_CatchOutput(void) { int nready; Job *job; unsigned int i; (void)fflush(stdout); /* The first fd in the list is the job token pipe */ do { nready = poll(fds + 1 - wantToken, fdsLen - 1 + wantToken, POLL_MSEC); } while (nready < 0 && errno == EINTR); if (nready < 0) Punt("poll: %s", strerror(errno)); if (nready > 0 && readyfd(&childExitJob)) { char token = 0; ssize_t count; count = read(childExitJob.inPipe, &token, 1); if (count == 1) { if (token == DO_JOB_RESUME[0]) /* * Complete relay requested from our SIGCONT * handler */ JobRestartJobs(); } else if (count == 0) Punt("unexpected eof on token pipe"); else Punt("token pipe read: %s", strerror(errno)); nready--; } Job_CatchChildren(); if (nready == 0) return; for (i = npseudojobs * nfds_per_job(); i < fdsLen; i++) { if (fds[i].revents == 0) continue; job = jobByFdIndex[i]; if (job->status == JOB_ST_RUNNING) CollectOutput(job, false); #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) /* * With meta mode, we may have activity on the job's filemon * descriptor too, which at the moment is any pollfd other * than job->inPollfd. */ if (useMeta && job->inPollfd != &fds[i]) { if (meta_job_event(job) <= 0) { fds[i].events = 0; /* never mind */ } } #endif if (--nready == 0) return; } } /* * Start the creation of a target. Basically a front-end for JobStart used by * the Make module. */ void Job_Make(GNode *gn) { (void)JobStart(gn, false); } static void InitShellNameAndPath(void) { shellName = shell->name; #ifdef DEFSHELL_CUSTOM if (shellName[0] == '/') { shellPath = shellName; shellName = str_basename(shellPath); return; } #endif shellPath = str_concat3(_PATH_DEFSHELLDIR, "/", shellName); } void Shell_Init(void) { if (shellPath == NULL) InitShellNameAndPath(); Var_SetWithFlags(SCOPE_CMDLINE, ".SHELL", shellPath, VAR_SET_READONLY); if (shell->errFlag == NULL) shell->errFlag = ""; if (shell->echoFlag == NULL) shell->echoFlag = ""; if (shell->hasErrCtl && shell->errFlag[0] != '\0') { if (shellErrFlag != NULL && strcmp(shell->errFlag, &shellErrFlag[1]) != 0) { free(shellErrFlag); shellErrFlag = NULL; } if (shellErrFlag == NULL) { size_t n = strlen(shell->errFlag) + 2; shellErrFlag = bmake_malloc(n); if (shellErrFlag != NULL) snprintf(shellErrFlag, n, "-%s", shell->errFlag); } } else if (shellErrFlag != NULL) { free(shellErrFlag); shellErrFlag = NULL; } } /* * Return the string literal that is used in the current command shell * to produce a newline character. */ const char * Shell_GetNewline(void) { return shell->newline; } void Job_SetPrefix(void) { if (targPrefix != NULL) { free(targPrefix); } else if (!Var_Exists(SCOPE_GLOBAL, MAKE_JOB_PREFIX)) { Global_Set(MAKE_JOB_PREFIX, "---"); } (void)Var_Subst("${" MAKE_JOB_PREFIX "}", SCOPE_GLOBAL, VARE_WANTRES, &targPrefix); /* TODO: handle errors */ } static void AddSig(int sig, SignalProc handler) { if (bmake_signal(sig, SIG_IGN) != SIG_IGN) { sigaddset(&caught_signals, sig); (void)bmake_signal(sig, handler); } } /* Initialize the process module. */ void Job_Init(void) { Job_SetPrefix(); /* Allocate space for all the job info */ job_table = bmake_malloc((size_t)opts.maxJobs * sizeof *job_table); memset(job_table, 0, (size_t)opts.maxJobs * sizeof *job_table); job_table_end = job_table + opts.maxJobs; wantToken = 0; caught_sigchld = 0; aborting = ABORT_NONE; job_errors = 0; /* * There is a non-zero chance that we already have children. * eg after 'make -f- < 0) continue; if (rval == 0) lurking_children = true; break; } Shell_Init(); JobCreatePipe(&childExitJob, 3); { /* Preallocate enough for the maximum number of jobs. */ size_t nfds = (npseudojobs + (size_t)opts.maxJobs) * nfds_per_job(); fds = bmake_malloc(sizeof *fds * nfds); jobByFdIndex = bmake_malloc(sizeof *jobByFdIndex * nfds); } /* 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); /* * 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); (void)Job_RunTarget(".BEGIN", NULL); /* Create the .END node now, even though no code in the unit tests * depends on it. See also Targ_GetEndNode in Compat_Run. */ (void)Targ_GetEndNode(); } static void DelSig(int sig) { if (sigismember(&caught_signals, sig) != 0) (void)bmake_signal(sig, SIG_DFL); } static void JobSigReset(void) { DelSig(SIGINT); DelSig(SIGHUP); DelSig(SIGQUIT); DelSig(SIGTERM); DelSig(SIGTSTP); DelSig(SIGTTOU); DelSig(SIGTTIN); DelSig(SIGWINCH); DelSig(SIGCONT); (void)bmake_signal(SIGCHLD, SIG_DFL); } /* Find a shell in 'shells' given its name, or return NULL. */ static Shell * FindShellByName(const char *name) { Shell *sh = shells; const Shell *shellsEnd = sh + sizeof shells / sizeof shells[0]; for (sh = shells; sh < shellsEnd; sh++) { if (strcmp(name, sh->name) == 0) return sh; } return NULL; } /* * Parse a shell specification and set up 'shell', shellPath and * shellName appropriately. * * Input: * line The shell spec * * Results: * false if the specification was incorrect. * * Side Effects: * 'shell' points to a Shell structure (either predefined or * created from the shell spec), shellPath is the full path of the * shell described by 'shell', 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. */ bool Job_ParseShell(char *line) { Words wordsList; char **words; char **argv; size_t argc; char *path; Shell newShell; bool fullSpec = false; Shell *sh; /* XXX: don't use line as an iterator variable */ pp_skip_whitespace(&line); free(shell_freeIt); memset(&newShell, 0, sizeof newShell); /* * Parse the specification by keyword */ wordsList = Str_Words(line, true); words = wordsList.words; argc = wordsList.len; path = wordsList.freeIt; if (words == NULL) { Error("Unterminated quoted string [%s]", line); return false; } shell_freeIt = path; for (path = NULL, argv = words; argc != 0; argc--, argv++) { char *arg = *argv; if (strncmp(arg, "path=", 5) == 0) { path = arg + 5; } else if (strncmp(arg, "name=", 5) == 0) { newShell.name = arg + 5; } else { if (strncmp(arg, "quiet=", 6) == 0) { newShell.echoOff = arg + 6; } else if (strncmp(arg, "echo=", 5) == 0) { newShell.echoOn = arg + 5; } else if (strncmp(arg, "filter=", 7) == 0) { newShell.noPrint = arg + 7; newShell.noPrintLen = strlen(newShell.noPrint); } else if (strncmp(arg, "echoFlag=", 9) == 0) { newShell.echoFlag = arg + 9; } else if (strncmp(arg, "errFlag=", 8) == 0) { newShell.errFlag = arg + 8; } else if (strncmp(arg, "hasErrCtl=", 10) == 0) { char c = arg[10]; newShell.hasErrCtl = c == 'Y' || c == 'y' || c == 'T' || c == 't'; } else if (strncmp(arg, "newline=", 8) == 0) { newShell.newline = arg + 8; } else if (strncmp(arg, "check=", 6) == 0) { /* Before 2020-12-10, these two variables * had been a single variable. */ newShell.errOn = arg + 6; newShell.echoTmpl = arg + 6; } else if (strncmp(arg, "ignore=", 7) == 0) { /* Before 2020-12-10, these two variables * had been a single variable. */ newShell.errOff = arg + 7; newShell.runIgnTmpl = arg + 7; } else if (strncmp(arg, "errout=", 7) == 0) { newShell.runChkTmpl = arg + 7; } else if (strncmp(arg, "comment=", 8) == 0) { newShell.commentChar = arg[8]; } else { Parse_Error(PARSE_FATAL, "Unknown keyword \"%s\"", arg); free(words); return false; } 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 FindShellByName and set things up the * right way. shellPath will be set up by Shell_Init. */ if (newShell.name == NULL) { Parse_Error(PARSE_FATAL, "Neither path nor name specified"); free(words); return false; } else { if ((sh = FindShellByName(newShell.name)) == NULL) { Parse_Error(PARSE_WARNING, "%s: No matching shell", newShell.name); free(words); return false; } shell = sh; shellName = newShell.name; if (shellPath != NULL) { /* * Shell_Init has already been called! * Do it again. */ free(UNCONST(shellPath)); shellPath = NULL; Shell_Init(); } } } 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++; } if (newShell.name != NULL) { shellName = newShell.name; } else { shellName = path; } if (!fullSpec) { if ((sh = FindShellByName(shellName)) == NULL) { Parse_Error(PARSE_WARNING, "%s: No matching shell", shellName); free(words); return false; } shell = sh; } else { shell = bmake_malloc(sizeof *shell); *shell = newShell; } /* this will take care of shellErrFlag */ Shell_Init(); } if (shell->echoOn != NULL && shell->echoOff != NULL) shell->hasEchoCtl = true; if (!shell->hasErrCtl) { if (shell->echoTmpl == NULL) shell->echoTmpl = ""; if (shell->runIgnTmpl == NULL) shell->runIgnTmpl = "%s\n"; } /* * Do not free up the words themselves, since they might be in use * by the shell specification. */ free(words); return true; } /* * Handle the receipt of an interrupt. * * All children are killed. Another job will be started if the .INTERRUPT * target is defined. * * Input: * runINTERRUPT Non-zero if commands for the .INTERRUPT target * should be executed * signo signal received */ static void JobInterrupt(bool 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->status != JOB_ST_RUNNING) continue; gn = job->node; JobDeleteTarget(gn); if (job->pid != 0) { DEBUG2(JOB, "JobInterrupt passing signal %d to child %d.\n", signo, job->pid); KILLPG(job->pid, signo); } } JobSigUnlock(&mask); if (runINTERRUPT && !opts.touchFlag) { interrupt = Targ_FindNode(".INTERRUPT"); if (interrupt != NULL) { opts.ignoreErrors = false; JobRun(interrupt); } } Trace_Log(MAKEINTR, NULL); exit(signo); /* XXX: why signo? */ } /* * Do the final processing, i.e. run the commands attached to the .END target. * * Return the number of errors reported. */ int Job_Finish(void) { GNode *endNode = Targ_GetEndNode(); if (!Lst_IsEmpty(&endNode->commands) || !Lst_IsEmpty(&endNode->children)) { if (job_errors != 0) { Error("Errors reported so .END ignored"); } else { JobRun(endNode); } } return job_errors; } /* Clean up any memory used by the jobs module. */ void Job_End(void) { #ifdef CLEANUP free(shell_freeIt); #endif } /* * Waits for all running jobs to finish and returns. * Sets 'aborting' to ABORT_WAIT to prevent other jobs from starting. */ void Job_Wait(void) { aborting = ABORT_WAIT; while (jobTokensRunning != 0) { Job_CatchOutput(); } aborting = ABORT_NONE; } /* * 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. * * 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 != 0) { for (job = job_table; job < job_table_end; job++) { if (job->status != 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; } /* * Tries to restart stopped jobs if there are slots available. * Called in process context in response to a SIGCONT. */ static void JobRestartJobs(void) { Job *job; for (job = job_table; job < job_table_end; job++) { if (job->status == JOB_ST_RUNNING && (make_suspended || job->suspended)) { DEBUG1(JOB, "Restarting stopped job pid %d.\n", job->pid); if (job->suspended) { (void)printf("*** [%s] Continued\n", job->node->name); (void)fflush(stdout); } job->suspended = false; if (KILLPG(job->pid, SIGCONT) != 0 && DEBUG(JOB)) { debug_printf("Failed to send SIGCONT to %d\n", job->pid); } } if (job->status == JOB_ST_FINISHED) { /* * Job exit deferred after calling waitpid() in a * signal handler */ JobFinish(job, job->exit_status); } } make_suspended = false; } static void watchfd(Job *job) { if (job->inPollfd != NULL) Punt("Watching watched job"); fds[fdsLen].fd = job->inPipe; fds[fdsLen].events = POLLIN; jobByFdIndex[fdsLen] = job; job->inPollfd = &fds[fdsLen]; fdsLen++; #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) if (useMeta) { fds[fdsLen].fd = meta_job_fd(job); fds[fdsLen].events = fds[fdsLen].fd == -1 ? 0 : POLLIN; jobByFdIndex[fdsLen] = job; fdsLen++; } #endif } static void clearfd(Job *job) { size_t i; if (job->inPollfd == NULL) Punt("Unwatching unwatched job"); i = (size_t)(job->inPollfd - fds); fdsLen--; #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) if (useMeta) { /* * Sanity check: there should be two fds per job, so the job's * pollfd number should be even. */ assert(nfds_per_job() == 2); if (i % 2 != 0) Punt("odd-numbered fd with meta"); fdsLen--; } #endif /* * Move last job in table into hole made by dead job. */ if (fdsLen != i) { fds[i] = fds[fdsLen]; jobByFdIndex[i] = jobByFdIndex[fdsLen]; jobByFdIndex[i]->inPollfd = &fds[i]; #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) if (useMeta) { fds[i + 1] = fds[fdsLen + 1]; jobByFdIndex[i + 1] = jobByFdIndex[fdsLen + 1]; } #endif } job->inPollfd = NULL; } static bool readyfd(Job *job) { if (job->inPollfd == NULL) Punt("Polling unwatched job"); return (job->inPollfd->revents & POLLIN) != 0; } /* * Put a token (back) into the job pipe. * This allows a make process to start a build job. */ 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; DEBUG3(JOB, "(%d) aborting %d, deposit token %c\n", getpid(), aborting, JOB_TOKENS[aborting]); while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN) continue; } /* Get a temp file */ int Job_TempFile(const char *pattern, char *tfile, size_t tfile_sz) { int fd; sigset_t mask; JobSigLock(&mask); fd = mkTempFile(pattern, tfile, tfile_sz); if (tfile != NULL && !DEBUG(SCRIPT)) unlink(tfile); JobSigUnlock(&mask); return fd; } /* 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; (void)fcntl(jp_0, F_SETFD, FD_CLOEXEC); (void)fcntl(jp_1, F_SETFD, FD_CLOEXEC); return; } JobCreatePipe(&tokenWaitJob, 15); snprintf(jobarg, sizeof jobarg, "%d,%d", tokenWaitJob.inPipe, tokenWaitJob.outPipe); Global_Append(MAKEFLAGS, "-J"); Global_Append(MAKEFLAGS, jobarg); /* * 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(); } /* Return a withdrawn token to the pool. */ void Job_TokenReturn(void) { jobTokensRunning--; if (jobTokensRunning < 0) Punt("token botch"); if (jobTokensRunning != 0 || JOB_TOKENS[aborting] != '+') JobTokenAdd(); } /* * Attempt to withdraw a token from the pool. * * If pool is empty, set wantToken so that we wake up when a token is * released. * * Returns true if a token was withdrawn, and false if the pool is currently * empty. */ bool Job_TokenWithdraw(void) { char tok, tok1; ssize_t count; wantToken = 0; DEBUG3(JOB, "Job_TokenWithdraw(%d): aborting %d, running %d\n", getpid(), aborting, jobTokensRunning); if (aborting != ABORT_NONE || (jobTokensRunning >= opts.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)); } DEBUG1(JOB, "(%d) blocked for token\n", getpid()); wantToken = 1; return false; } if (count == 1 && tok != '+') { /* make being aborted - remove any other job tokens */ DEBUG2(JOB, "(%d) aborted by token %c\n", getpid(), tok); while (read(tokenWaitJob.inPipe, &tok1, 1) == 1) continue; /* And put the stopper back */ while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN) continue; if (shouldDieQuietly(NULL, 1)) exit(6); /* we aborted */ 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 */ while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN) continue; jobTokensRunning++; DEBUG1(JOB, "(%d) withdrew token\n", getpid()); return true; } /* * Run the named target if found. If a filename is specified, then set that * to the sources. * * Exits if the target fails. */ bool Job_RunTarget(const char *target, const char *fname) { GNode *gn = Targ_FindNode(target); if (gn == NULL) return false; if (fname != NULL) Var_Set(gn, ALLSRC, fname); JobRun(gn); /* XXX: Replace with GNode_IsError(gn) */ if (gn->made == ERROR) { PrintOnError(gn, "\n\nStop."); exit(1); } 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, NULL, 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 */