/* $NetBSD: proc.c,v 1.34 2007/07/16 18:26:10 christos Exp $ */ /*- * Copyright (c) 1980, 1991, 1993 * The Regents of the University of California. All rights reserved. * * 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. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)proc.c 8.1 (Berkeley) 5/31/93"; #else __RCSID("$NetBSD: proc.c,v 1.34 2007/07/16 18:26:10 christos Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include "csh.h" #include "dir.h" #include "extern.h" #include "proc.h" #define BIGINDEX 9 /* largest desirable job index */ extern int insource; static void pflushall(void); static void pflush(struct process *); static void pclrcurr(struct process *); static void padd(struct command *); static int pprint(struct process *, int); static void ptprint(struct process *); static void pads(Char *); static void pkill(Char **v, int); static struct process *pgetcurr(struct process *); static void okpcntl(void); /* * pchild - called at interrupt level by the SIGCHLD signal * indicating that at least one child has terminated or stopped * thus at least one wait system call will definitely return a * childs status. Top level routines (like pwait) must be sure * to mask interrupts when playing with the proclist data structures! */ /* ARGSUSED */ void pchild(int notused) { struct rusage ru; struct process *fp, *pp; int jobflags, pid, w; loop: errno = 0; /* reset, just in case */ pid = wait3(&w, (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); if (pid <= 0) { if (errno == EINTR) { errno = 0; goto loop; } pnoprocesses = pid == -1; return; } for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) if (pid == pp->p_pid) goto found; goto loop; found: if (pid == atoi(short2str(value(STRchild)))) unsetv(STRchild); pp->p_flags &= ~(PRUNNING | PSTOPPED | PREPORTED); if (WIFSTOPPED(w)) { pp->p_flags |= PSTOPPED; pp->p_reason = WSTOPSIG(w); } else { if (pp->p_flags & (PTIME | PPTIME) || adrof(STRtime)) (void)gettimeofday(&pp->p_etime, NULL); pp->p_rusage = ru; if (WIFSIGNALED(w)) { if (WTERMSIG(w) == SIGINT) pp->p_flags |= PINTERRUPTED; else pp->p_flags |= PSIGNALED; if (WCOREDUMP(w)) pp->p_flags |= PDUMPED; pp->p_reason = WTERMSIG(w); } else { pp->p_reason = WEXITSTATUS(w); if (pp->p_reason != 0) pp->p_flags |= PAEXITED; else pp->p_flags |= PNEXITED; } } jobflags = 0; fp = pp; do { if ((fp->p_flags & (PPTIME | PRUNNING | PSTOPPED)) == 0 && !child && adrof(STRtime) && fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec >= atoi(short2str(value(STRtime)))) fp->p_flags |= PTIME; jobflags |= fp->p_flags; } while ((fp = fp->p_friends) != pp); pp->p_flags &= ~PFOREGND; if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { pp->p_flags &= ~PPTIME; pp->p_flags |= PTIME; } if ((jobflags & (PRUNNING | PREPORTED)) == 0) { fp = pp; do { if (fp->p_flags & PSTOPPED) fp->p_flags |= PREPORTED; } while ((fp = fp->p_friends) != pp); while (fp->p_pid != fp->p_jobid) fp = fp->p_friends; if (jobflags & PSTOPPED) { if (pcurrent && pcurrent != fp) pprevious = pcurrent; pcurrent = fp; } else pclrcurr(fp); if (jobflags & PFOREGND) { if (jobflags & (PSIGNALED | PSTOPPED | PPTIME) || #ifdef IIASA jobflags & PAEXITED || #endif !eq(dcwd->di_name, fp->p_cwd->di_name)) { ; /* print in pjwait */ } /* PWP: print a newline after ^C */ else if (jobflags & PINTERRUPTED) { (void)vis_fputc('\r' | QUOTE, cshout); (void)fputc('\n', cshout); } } else { if (jobflags & PNOTIFY || adrof(STRnotify)) { (void)vis_fputc('\r' | QUOTE, cshout); (void)fputc('\n', cshout); (void)pprint(pp, NUMBER | NAME | REASON); if ((jobflags & PSTOPPED) == 0) pflush(pp); } else { fp->p_flags |= PNEEDNOTE; neednote++; } } } goto loop; } void pnote(void) { struct process *pp; sigset_t osigset, nsigset; int flags; neednote = 0; sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) { if (pp->p_flags & PNEEDNOTE) { (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); pp->p_flags &= ~PNEEDNOTE; flags = pprint(pp, NUMBER | NAME | REASON); if ((flags & (PRUNNING | PSTOPPED)) == 0) pflush(pp); (void)sigprocmask(SIG_SETMASK, &osigset, NULL); } } } /* * pwait - wait for current job to terminate, maintaining integrity * of current and previous job indicators. */ void pwait(void) { struct process *fp, *pp; sigset_t osigset, nsigset; /* * Here's where dead procs get flushed. */ sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); for (pp = (fp = &proclist)->p_next; pp != NULL; pp = (fp = pp)->p_next) if (pp->p_pid == 0) { fp->p_next = pp->p_next; xfree((ptr_t) pp->p_command); if (pp->p_cwd && --pp->p_cwd->di_count == 0) if (pp->p_cwd->di_next == 0) dfree(pp->p_cwd); xfree((ptr_t) pp); pp = fp; } (void)sigprocmask(SIG_SETMASK, &osigset, NULL); pjwait(pcurrjob); } /* * pjwait - wait for a job to finish or become stopped * It is assumed to be in the foreground state (PFOREGND) */ void pjwait(struct process *pp) { struct process *fp; sigset_t osigset, nsigset; int jobflags, reason; while (pp->p_pid != pp->p_jobid) pp = pp->p_friends; fp = pp; do { if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING) (void)fprintf(csherr, "BUG: waiting for background job!\n"); } while ((fp = fp->p_friends) != pp); /* * Now keep pausing as long as we are not interrupted (SIGINT), and the * target process, or any of its friends, are running */ fp = pp; sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); for (;;) { sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); (void)sigprocmask(SIG_BLOCK, &nsigset, NULL); jobflags = 0; do jobflags |= fp->p_flags; while ((fp = (fp->p_friends)) != pp); if ((jobflags & PRUNNING) == 0) break; #ifdef JOBDEBUG (void)fprintf(csherr, "starting to sigsuspend for SIGCHLD on %d\n", fp->p_pid); #endif /* JOBDEBUG */ nsigset = osigset; (void)sigdelset(&nsigset, SIGCHLD); (void)sigsuspend(&nsigset); } (void)sigprocmask(SIG_SETMASK, &osigset, NULL); if (tpgrp > 0) /* get tty back */ (void)tcsetpgrp(FSHTTY, tpgrp); if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) || !eq(dcwd->di_name, fp->p_cwd->di_name)) { if (jobflags & PSTOPPED) { (void) fputc('\n', cshout); if (adrof(STRlistjobs)) { Char *jobcommand[3]; jobcommand[0] = STRjobs; if (eq(value(STRlistjobs), STRlong)) jobcommand[1] = STRml; else jobcommand[1] = NULL; jobcommand[2] = NULL; dojobs(jobcommand, NULL); (void)pprint(pp, SHELLDIR); } else (void)pprint(pp, AREASON | SHELLDIR); } else (void)pprint(pp, AREASON | SHELLDIR); } if ((jobflags & (PINTERRUPTED | PSTOPPED)) && setintr && (!gointr || !eq(gointr, STRminus))) { if ((jobflags & PSTOPPED) == 0) pflush(pp); pintr1(0); } reason = 0; fp = pp; do { if (fp->p_reason) reason = fp->p_flags & (PSIGNALED | PINTERRUPTED) ? fp->p_reason | META : fp->p_reason; } while ((fp = fp->p_friends) != pp); if ((reason != 0) && (adrof(STRprintexitvalue))) { (void)fprintf(cshout, "Exit %d\n", reason); } set(STRstatus, putn(reason)); if (reason && exiterr) exitstat(); pflush(pp); } /* * dowait - wait for all processes to finish */ void /*ARGSUSED*/ dowait(Char **v, struct command *t) { struct process *pp; sigset_t osigset, nsigset; pjobs++; sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); loop: for (pp = proclist.p_next; pp; pp = pp->p_next) if (pp->p_pid && /* pp->p_pid == pp->p_jobid && */ pp->p_flags & PRUNNING) { sigemptyset(&nsigset); (void)sigsuspend(&nsigset); goto loop; } (void)sigprocmask(SIG_SETMASK, &osigset, NULL); pjobs = 0; } /* * pflushall - flush all jobs from list (e.g. at fork()) */ static void pflushall(void) { struct process *pp; for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) if (pp->p_pid) pflush(pp); } /* * pflush - flag all process structures in the same job as the * the argument process for deletion. The actual free of the * space is not done here since pflush is called at interrupt level. */ static void pflush(struct process *pp) { struct process *np; int idx; if (pp->p_pid == 0) { (void)fprintf(csherr, "BUG: process flushed twice"); return; } while (pp->p_pid != pp->p_jobid) pp = pp->p_friends; pclrcurr(pp); if (pp == pcurrjob) pcurrjob = 0; idx = pp->p_index; np = pp; do { np->p_index = np->p_pid = 0; np->p_flags &= ~PNEEDNOTE; } while ((np = np->p_friends) != pp); if (idx == pmaxindex) { for (np = proclist.p_next, idx = 0; np; np = np->p_next) if (np->p_index > idx) idx = np->p_index; pmaxindex = idx; } } /* * pclrcurr - make sure the given job is not the current or previous job; * pp MUST be the job leader */ static void pclrcurr(struct process *pp) { if (pp == pcurrent) { if (pprevious != NULL) { pcurrent = pprevious; pprevious = pgetcurr(pp); } else { pcurrent = pgetcurr(pp); pprevious = pgetcurr(pp); } } else if (pp == pprevious) pprevious = pgetcurr(pp); } /* +4 here is 1 for '\0', 1 ea for << >& >> */ static Char command[PMAXLEN + 4]; static int cmdlen; static Char *cmdp; /* * palloc - allocate a process structure and fill it up. * an important assumption is made that the process is running. */ void palloc(int pid, struct command *t) { struct process *pp; int i; pp = (struct process *)xcalloc(1, (size_t)sizeof(struct process)); pp->p_pid = pid; pp->p_flags = t->t_dflg & F_AMPERSAND ? PRUNNING : PRUNNING | PFOREGND; if (t->t_dflg & F_TIME) pp->p_flags |= PPTIME; cmdp = command; cmdlen = 0; padd(t); *cmdp++ = 0; if (t->t_dflg & F_PIPEOUT) { pp->p_flags |= PPOU; if (t->t_dflg & F_STDERR) pp->p_flags |= PERR; } pp->p_command = Strsave(command); if (pcurrjob) { struct process *fp; /* careful here with interrupt level */ pp->p_cwd = 0; pp->p_index = pcurrjob->p_index; pp->p_friends = pcurrjob; pp->p_jobid = pcurrjob->p_pid; for (fp = pcurrjob; fp->p_friends != pcurrjob; fp = fp->p_friends) continue; fp->p_friends = pp; } else { pcurrjob = pp; pp->p_jobid = pid; pp->p_friends = pp; pp->p_cwd = dcwd; dcwd->di_count++; if (pmaxindex < BIGINDEX) pp->p_index = ++pmaxindex; else { struct process *np; for (i = 1;; i++) { for (np = proclist.p_next; np; np = np->p_next) if (np->p_index == i) goto tryagain; pp->p_index = i; if (i > pmaxindex) pmaxindex = i; break; tryagain:; } } if (pcurrent == NULL) pcurrent = pp; else if (pprevious == NULL) pprevious = pp; } pp->p_next = proclist.p_next; proclist.p_next = pp; (void)gettimeofday(&pp->p_btime, NULL); } static void padd(struct command *t) { Char **argp; if (t == 0) return; switch (t->t_dtyp) { case NODE_PAREN: pads(STRLparensp); padd(t->t_dspr); pads(STRspRparen); break; case NODE_COMMAND: for (argp = t->t_dcom; *argp; argp++) { pads(*argp); if (argp[1]) pads(STRspace); } break; case NODE_OR: case NODE_AND: case NODE_PIPE: case NODE_LIST: padd(t->t_dcar); switch (t->t_dtyp) { case NODE_OR: pads(STRspor2sp); break; case NODE_AND: pads(STRspand2sp); break; case NODE_PIPE: pads(STRsporsp); break; case NODE_LIST: pads(STRsemisp); break; } padd(t->t_dcdr); return; } if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) { pads((t->t_dflg & F_READ) ? STRspLarrow2sp : STRspLarrowsp); pads(t->t_dlef); } if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) { pads((t->t_dflg & F_APPEND) ? STRspRarrow2 : STRspRarrow); if (t->t_dflg & F_STDERR) pads(STRand); pads(STRspace); pads(t->t_drit); } } static void pads(Char *cp) { int i; /* * Avoid the Quoted Space alias hack! Reported by: * sam@john-bigboote.ICS.UCI.EDU (Sam Horrocks) */ if (cp[0] == STRQNULL[0]) cp++; i = Strlen(cp); if (cmdlen >= PMAXLEN) return; if (cmdlen + i >= PMAXLEN) { (void)Strcpy(cmdp, STRsp3dots); cmdlen = PMAXLEN; cmdp += 4; return; } (void)Strcpy(cmdp, cp); cmdp += i; cmdlen += i; } /* * psavejob - temporarily save the current job on a one level stack * so another job can be created. Used for { } in exp6 * and `` in globbing. */ void psavejob(void) { pholdjob = pcurrjob; pcurrjob = NULL; } /* * prestjob - opposite of psavejob. This may be missed if we are interrupted * somewhere, but pendjob cleans up anyway. */ void prestjob(void) { pcurrjob = pholdjob; pholdjob = NULL; } /* * pendjob - indicate that a job (set of commands) has been completed * or is about to begin. */ void pendjob(void) { struct process *pp, *tp; if (pcurrjob && (pcurrjob->p_flags & (PFOREGND | PSTOPPED)) == 0) { pp = pcurrjob; while (pp->p_pid != pp->p_jobid) pp = pp->p_friends; (void)fprintf(cshout, "[%d]", pp->p_index); tp = pp; do { (void)fprintf(cshout, " %ld", (long)pp->p_pid); pp = pp->p_friends; } while (pp != tp); (void)fputc('\n', cshout); } pholdjob = pcurrjob = 0; } /* * pprint - print a job */ static int pprint(struct process *pp, int flag) { static struct rusage zru; struct process *tp; const char *format; int jobflags, pstatus, reason, status; int hadnl; hadnl = 1; /* did we just have a newline */ (void)fpurge(cshout); while (pp->p_pid != pp->p_jobid) pp = pp->p_friends; if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { pp->p_flags &= ~PPTIME; pp->p_flags |= PTIME; } tp = pp; status = reason = -1; jobflags = 0; do { jobflags |= pp->p_flags; pstatus = pp->p_flags & PALLSTATES; if (tp != pp && !hadnl && !(flag & FANCY) && ((pstatus == status && pp->p_reason == reason) || !(flag & REASON))) { (void)fputc(' ', cshout); hadnl = 0; } else { if (tp != pp && !hadnl) { (void)fputc('\n', cshout); hadnl = 1; } if (flag & NUMBER) { if (pp == tp) (void)fprintf(cshout, "[%d]%s %c ", pp->p_index, pp->p_index < 10 ? " " : "", pp == pcurrent ? '+' : (pp == pprevious ? '-' : ' ')); else (void)fprintf(cshout, " "); hadnl = 0; } if (flag & FANCY) { (void)fprintf(cshout, "%5ld ", (long)pp->p_pid); hadnl = 0; } if (flag & (REASON | AREASON)) { if (flag & NAME) format = "%-23s"; else format = "%s"; if (pstatus == status) { if (pp->p_reason == reason) { (void)fprintf(cshout, format, ""); hadnl = 0; goto prcomd; } else reason = pp->p_reason; } else { status = pstatus; reason = pp->p_reason; } switch (status) { case PRUNNING: (void)fprintf(cshout, format, "Running "); hadnl = 0; break; case PINTERRUPTED: case PSTOPPED: case PSIGNALED: /* * tell what happened to the background job * From: Michael Schroeder * */ if ((flag & REASON) || ((flag & AREASON) && reason != SIGINT && (reason != SIGPIPE || (pp->p_flags & PPOU) == 0))) { (void)fprintf(cshout, format, sys_siglist[(unsigned char) pp->p_reason]); hadnl = 0; } break; case PNEXITED: case PAEXITED: if (flag & REASON) { if (pp->p_reason) (void)fprintf(cshout, "Exit %-18d", pp->p_reason); else (void)fprintf(cshout, format, "Done"); hadnl = 0; } break; default: (void)fprintf(csherr, "BUG: status=%-9o", status); } } } prcomd: if (flag & NAME) { (void)fprintf(cshout, "%s", vis_str(pp->p_command)); if (pp->p_flags & PPOU) (void)fprintf(cshout, " |"); if (pp->p_flags & PERR) (void)fputc('&', cshout); hadnl = 0; } if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED) { (void)fprintf(cshout, " (core dumped)"); hadnl = 0; } if (tp == pp->p_friends) { if (flag & AMPERSAND) { (void)fprintf(cshout, " &"); hadnl = 0; } if (flag & JOBDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) { (void)fprintf(cshout, " (wd: "); dtildepr(value(STRhome), tp->p_cwd->di_name); (void)fputc(')', cshout); hadnl = 0; } } if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) { if (!hadnl) (void)fprintf(cshout, "\n\t"); prusage(cshout, &zru, &pp->p_rusage, &pp->p_etime, &pp->p_btime); hadnl = 1; } if (tp == pp->p_friends) { if (!hadnl) { (void)fputc('\n', cshout); hadnl = 1; } if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) { (void)fprintf(cshout, "(wd now: "); dtildepr(value(STRhome), dcwd->di_name); (void)fprintf(cshout, ")\n"); hadnl = 1; } } } while ((pp = pp->p_friends) != tp); if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) { if (jobflags & NUMBER) (void)fprintf(cshout, " "); ptprint(tp); hadnl = 1; } (void)fflush(cshout); return (jobflags); } static void ptprint(struct process *tp) { static struct rusage zru; static struct timeval ztime; struct rusage ru; struct timeval tetime, diff; struct process *pp; pp = tp; ru = zru; tetime = ztime; do { ruadd(&ru, &pp->p_rusage); timersub(&pp->p_etime, &pp->p_btime, &diff); if (timercmp(&diff, &tetime, >)) tetime = diff; } while ((pp = pp->p_friends) != tp); prusage(cshout, &zru, &ru, &tetime, &ztime); } /* * dojobs - print all jobs */ void /*ARGSUSED*/ dojobs(Char **v, struct command *t) { struct process *pp; int flag, i; flag = NUMBER | NAME | REASON; if (chkstop) chkstop = 2; if (*++v) { if (v[1] || !eq(*v, STRml)) stderror(ERR_JOBS); flag |= FANCY | JOBDIR; } for (i = 1; i <= pmaxindex; i++) for (pp = proclist.p_next; pp; pp = pp->p_next) if (pp->p_index == i && pp->p_pid == pp->p_jobid) { pp->p_flags &= ~PNEEDNOTE; if (!(pprint(pp, flag) & (PRUNNING | PSTOPPED))) pflush(pp); break; } } /* * dofg - builtin - put the job into the foreground */ void /*ARGSUSED*/ dofg(Char **v, struct command *t) { struct process *pp; okpcntl(); ++v; do { pp = pfind(*v); pstart(pp, 1); pjwait(pp); } while (*v && *++v); } /* * %... - builtin - put the job into the foreground */ void /*ARGSUSED*/ dofg1(Char **v, struct command *t) { struct process *pp; okpcntl(); pp = pfind(v[0]); pstart(pp, 1); pjwait(pp); } /* * dobg - builtin - put the job into the background */ void /*ARGSUSED*/ dobg(Char **v, struct command *t) { struct process *pp; okpcntl(); ++v; do { pp = pfind(*v); pstart(pp, 0); } while (*v && *++v); } /* * %... & - builtin - put the job into the background */ void /*ARGSUSED*/ dobg1(Char **v, struct command *t) { struct process *pp; pp = pfind(v[0]); pstart(pp, 0); } /* * dostop - builtin - stop the job */ void /*ARGSUSED*/ dostop(Char **v, struct command *t) { pkill(++v, SIGSTOP); } /* * dokill - builtin - superset of kill (1) */ void /*ARGSUSED*/ dokill(Char **v, struct command *t) { Char *signame; char *name; int signum; char *ep; signum = SIGTERM; v++; if (v[0] && v[0][0] == '-') { if (v[0][1] == 'l') { if (v[1]) { if (!Isdigit(v[1][0])) stderror(ERR_NAME | ERR_BADSIG); signum = strtol(short2str(v[1]), &ep, 10); if (signum < 0 || signum >= NSIG) stderror(ERR_NAME | ERR_BADSIG); else if (signum == 0) (void)fputc('0', cshout); /* 0's symbolic name is '0' */ else (void)fprintf(cshout, "%s ", sys_signame[signum]); } else { for (signum = 1; signum < NSIG; signum++) { (void)fprintf(cshout, "%s ", sys_signame[signum]); if (signum == NSIG / 2) (void)fputc('\n', cshout); } } (void)fputc('\n', cshout); return; } if (Isdigit(v[0][1])) { signum = strtol(short2str(v[0] + 1), &ep, 10); if (signum < 0 || signum >= NSIG || *ep) stderror(ERR_NAME | ERR_BADSIG); } else { if (v[0][1] == 's' && v[0][2] == '\0') signame = *(++v); else signame = &v[0][1]; if (signame == NULL || v[1] == NULL) stderror(ERR_NAME | ERR_TOOFEW); name = short2str(signame); for (signum = 1; signum < NSIG; signum++) if (!strcasecmp(sys_signame[signum], name) || (!strncasecmp("SIG", name, 3) && /* skip "SIG" prefix */ !strcasecmp(sys_signame[signum], name + 3))) break; if (signum == NSIG) { if (signame[0] == '0') signum = 0; else { setname(vis_str(signame)); stderror(ERR_NAME | ERR_UNKSIG); } } } v++; } pkill(v, signum); } static void pkill(Char **v, int signum) { struct process *pp, *np; Char *cp; sigset_t nsigset; int err1, jobflags, pid; char *ep; jobflags = 0; err1 = 0; sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); if (setintr) (void)sigaddset(&nsigset, SIGINT); (void)sigprocmask(SIG_BLOCK, &nsigset, NULL); gflag = 0, tglob(v); if (gflag) { v = globall(v); if (v == 0) stderror(ERR_NAME | ERR_NOMATCH); } else { v = gargv = saveblk(v); trim(v); } while (v && (cp = *v)) { if (*cp == '%') { np = pp = pfind(cp); do jobflags |= np->p_flags; while ((np = np->p_friends) != pp); switch (signum) { case SIGSTOP: case SIGTSTP: case SIGTTIN: case SIGTTOU: if ((jobflags & PRUNNING) == 0) { (void)fprintf(csherr, "%s: Already suspended\n", vis_str(cp)); err1++; goto cont; } break; /* * suspend a process, kill -CONT %, then type jobs; the shell * says it is suspended, but it is running; thanks jaap.. */ case SIGCONT: pstart(pp, 0); goto cont; } if (kill(-pp->p_jobid, signum) < 0) { (void)fprintf(csherr, "%s: %s\n", vis_str(cp), strerror(errno)); err1++; } if (signum == SIGTERM || signum == SIGHUP) (void)kill(-pp->p_jobid, SIGCONT); } else if (!(Isdigit(*cp) || *cp == '-')) stderror(ERR_NAME | ERR_JOBARGS); else { pid = strtoul(short2str(cp), &ep, 0); if (*ep) { (void)fprintf(csherr, "%s: Badly formed number\n", short2str(cp)); err1++; goto cont; } else if (kill(pid, signum) < 0) { (void)fprintf(csherr, "%d: %s\n", pid, strerror(errno)); err1++; goto cont; } if (signum == SIGTERM || signum == SIGHUP) (void)kill((pid_t) pid, SIGCONT); } cont: v++; } if (gargv) blkfree(gargv), gargv = 0; (void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL); if (err1) stderror(ERR_SILENT); } /* * pstart - start the job in foreground/background */ void pstart(struct process *pp, int foregnd) { struct process *np; sigset_t osigset, nsigset; long jobflags; jobflags = 0; sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); np = pp; do { jobflags |= np->p_flags; if (np->p_flags & (PRUNNING | PSTOPPED)) { np->p_flags |= PRUNNING; np->p_flags &= ~PSTOPPED; if (foregnd) np->p_flags |= PFOREGND; else np->p_flags &= ~PFOREGND; } } while ((np = np->p_friends) != pp); if (!foregnd) pclrcurr(pp); (void)pprint(pp, foregnd ? NAME | JOBDIR : NUMBER | NAME | AMPERSAND); if (foregnd) (void)tcsetpgrp(FSHTTY, pp->p_jobid); if (jobflags & PSTOPPED) (void)kill(-pp->p_jobid, SIGCONT); (void)sigprocmask(SIG_SETMASK, &osigset, NULL); } void panystop(int neednl) { struct process *pp; chkstop = 2; for (pp = proclist.p_next; pp; pp = pp->p_next) if (pp->p_flags & PSTOPPED) stderror(ERR_STOPPED, neednl ? "\n" : ""); } struct process * pfind(Char *cp) { struct process *pp, *np; if (cp == 0 || cp[1] == 0 || eq(cp, STRcent2) || eq(cp, STRcentplus)) { if (pcurrent == NULL) stderror(ERR_NAME | ERR_JOBCUR); return (pcurrent); } if (eq(cp, STRcentminus) || eq(cp, STRcenthash)) { if (pprevious == NULL) stderror(ERR_NAME | ERR_JOBPREV); return (pprevious); } if (Isdigit(cp[1])) { int idx = atoi(short2str(cp + 1)); for (pp = proclist.p_next; pp; pp = pp->p_next) if (pp->p_index == idx && pp->p_pid == pp->p_jobid) return (pp); stderror(ERR_NAME | ERR_NOSUCHJOB); } np = NULL; for (pp = proclist.p_next; pp; pp = pp->p_next) if (pp->p_pid == pp->p_jobid) { if (cp[1] == '?') { Char *dp; for (dp = pp->p_command; *dp; dp++) { if (*dp != cp[2]) continue; if (prefix(cp + 2, dp)) goto match; } } else if (prefix(cp + 1, pp->p_command)) { match: if (np) stderror(ERR_NAME | ERR_AMBIG); np = pp; } } if (np) return (np); stderror(ERR_NAME | (cp[1] == '?' ? ERR_JOBPAT : ERR_NOSUCHJOB)); /* NOTREACHED */ } /* * pgetcurr - find most recent job that is not pp, preferably stopped */ static struct process * pgetcurr(struct process *pp) { struct process *np, *xp; xp = NULL; for (np = proclist.p_next; np; np = np->p_next) if (np != pcurrent && np != pp && np->p_pid && np->p_pid == np->p_jobid) { if (np->p_flags & PSTOPPED) return (np); if (xp == NULL) xp = np; } return (xp); } /* * donotify - flag the job so as to report termination asynchronously */ void /*ARGSUSED*/ donotify(Char **v, struct command *t) { struct process *pp; pp = pfind(*++v); pp->p_flags |= PNOTIFY; } /* * Do the fork and whatever should be done in the child side that * should not be done if we are not forking at all (like for simple builtin's) * Also do everything that needs any signals fiddled with in the parent side * * Wanttty tells whether process and/or tty pgrps are to be manipulated: * -1: leave tty alone; inherit pgrp from parent * 0: already have tty; manipulate process pgrps only * 1: want to claim tty; manipulate process and tty pgrps * It is usually just the value of tpgrp. */ int pfork(struct command *t /* command we are forking for */, int wanttty) { int pgrp, pid; sigset_t osigset, nsigset; int ignint; ignint = 0; /* * A child will be uninterruptible only under very special conditions. * Remember that the semantics of '&' is implemented by disconnecting the * process from the tty so signals do not need to ignored just for '&'. * Thus signals are set to default action for children unless: we have had * an "onintr -" (then specifically ignored) we are not playing with * signals (inherit action) */ if (setintr) ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) || (gointr && eq(gointr, STRminus)); /* * Check for maximum nesting of 16 processes to avoid Forking loops */ if (child == 16) stderror(ERR_NESTING, 16); /* * Hold SIGCHLD until we have the process installed in our table. */ sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGCHLD); (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); while ((pid = fork()) < 0) if (setintr == 0) (void)sleep(FORKSLEEP); else { (void)sigprocmask(SIG_SETMASK, &osigset, NULL); stderror(ERR_NOPROC); } if (pid == 0) { settimes(); pgrp = pcurrjob ? pcurrjob->p_jobid : getpid(); pflushall(); pcurrjob = NULL; child++; if (setintr) { setintr = 0; /* until I think otherwise */ /* * Children just get blown away on SIGINT, SIGQUIT unless "onintr * -" seen. */ (void)signal(SIGINT, ignint ? SIG_IGN : SIG_DFL); (void)signal(SIGQUIT, ignint ? SIG_IGN : SIG_DFL); if (wanttty >= 0) { /* make stoppable */ (void)signal(SIGTSTP, SIG_DFL); (void)signal(SIGTTIN, SIG_DFL); (void)signal(SIGTTOU, SIG_DFL); } (void)signal(SIGTERM, parterm); } else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) { (void)signal(SIGINT, SIG_IGN); (void)signal(SIGQUIT, SIG_IGN); } pgetty(wanttty, pgrp); /* * Nohup and nice apply only to NODE_COMMAND's but it would be nice * (?!?) if you could say "nohup (foo;bar)" Then the parser would have * to know about nice/nohup/time */ if (t->t_dflg & F_NOHUP) (void)signal(SIGHUP, SIG_IGN); if (t->t_dflg & F_NICE) (void)setpriority(PRIO_PROCESS, 0, t->t_nice); } else { if (wanttty >= 0) (void)setpgid(pid, pcurrjob ? pcurrjob->p_jobid : pid); palloc(pid, t); (void)sigprocmask(SIG_SETMASK, &osigset, NULL); } return (pid); } static void okpcntl(void) { if (tpgrp == -1) stderror(ERR_JOBCONTROL); if (tpgrp == 0) stderror(ERR_JOBCTRLSUB); /* NOTREACHED */ } /* * if we don't have vfork(), things can still go in the wrong order * resulting in the famous 'Stopped (tty output)'. But some systems * don't permit the setpgid() call, (these are more recent secure * systems such as ibm's aix). Then we'd rather print an error message * than hang the shell! * I am open to suggestions how to fix that. */ void pgetty(int wanttty, int pgrp) { sigset_t osigset, nsigset; /* * christos: I am blocking the tty signals till I've set things * correctly.... */ if (wanttty > 0) { sigemptyset(&nsigset); (void)sigaddset(&nsigset, SIGTSTP); (void)sigaddset(&nsigset, SIGTTIN); (void)sigaddset(&nsigset, SIGTTOU); (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); } /* * From: Michael Schroeder * Don't check for tpgrp >= 0 so even non-interactive shells give * background jobs process groups Same for the comparison in the other part * of the #ifdef */ if (wanttty >= 0) if (setpgid(0, pgrp) == -1) { (void)fprintf(csherr, "csh: setpgid error.\n"); xexit(0); } if (wanttty > 0) { (void)tcsetpgrp(FSHTTY, pgrp); (void)sigprocmask(SIG_SETMASK, &osigset, NULL); } if (tpgrp > 0) tpgrp = 0; /* gave tty away */ }