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Diffstat (limited to 'contrib/tcsh/sh.proc.c')
-rw-r--r-- | contrib/tcsh/sh.proc.c | 2028 |
1 files changed, 2028 insertions, 0 deletions
diff --git a/contrib/tcsh/sh.proc.c b/contrib/tcsh/sh.proc.c new file mode 100644 index 0000000..f2356d1 --- /dev/null +++ b/contrib/tcsh/sh.proc.c @@ -0,0 +1,2028 @@ +/* $Header: /p/tcsh/cvsroot/tcsh/sh.proc.c,v 3.121 2012/01/25 15:34:41 christos Exp $ */ +/* + * sh.proc.c: Job manipulations + */ +/*- + * Copyright (c) 1980, 1991 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 "sh.h" + +RCSID("$tcsh: sh.proc.c,v 3.121 2012/01/25 15:34:41 christos Exp $") + +#include "ed.h" +#include "tc.h" +#include "tc.wait.h" + +#ifdef WINNT_NATIVE +#undef POSIX +#define POSIX +#endif /* WINNT_NATIVE */ +#ifdef aiws +# undef HZ +# define HZ 16 +#endif /* aiws */ + +#if defined(_BSD) || (defined(IRIS4D) && __STDC__) || defined(__lucid) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__) +# if !defined(__ANDROID__) +# define BSDWAIT +# endif +#endif /* _BSD || (IRIS4D && __STDC__) || __lucid || glibc */ +#ifndef WTERMSIG +# define WTERMSIG(w) (((union wait *) &(w))->w_termsig) +# ifndef BSDWAIT +# define BSDWAIT +# endif /* !BSDWAIT */ +#endif /* !WTERMSIG */ +#ifndef WEXITSTATUS +# define WEXITSTATUS(w) (((union wait *) &(w))->w_retcode) +#endif /* !WEXITSTATUS */ +#ifndef WSTOPSIG +# define WSTOPSIG(w) (((union wait *) &(w))->w_stopsig) +#endif /* !WSTOPSIG */ + +#ifdef __osf__ +# ifndef WCOREDUMP +# define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG) +# endif +#endif + +#ifndef WCOREDUMP +# ifdef BSDWAIT +# define WCOREDUMP(w) (((union wait *) &(w))->w_coredump) +# else /* !BSDWAIT */ +# define WCOREDUMP(w) ((w) & 0200) +# endif /* !BSDWAIT */ +#endif /* !WCOREDUMP */ + +#ifndef JOBDEBUG +# define jobdebug_xprintf(x) (void)0 +# define jobdebug_flush() (void)0 +#else +# define jobdebug_xprintf(s) xprintf s +# define jobdebug_flush() flush() +#endif + +/* + * C Shell - functions that manage processes, handling hanging, termination + */ + +#define BIGINDEX 9 /* largest desirable job index */ + +#ifdef BSDTIMES +# ifdef convex +/* use 'cvxrusage' to get parallel statistics */ +static struct cvxrusage zru = {{0L, 0L}, {0L, 0L}, 0L, 0L, 0L, 0L, + 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, + {0L, 0L}, 0LL, 0LL, 0LL, 0LL, 0L, 0L, 0L, + 0LL, 0LL, {0L, 0L, 0L, 0L, 0L}}; +# else +static struct rusage zru; +# endif /* convex */ +#else /* !BSDTIMES */ +# ifdef _SEQUENT_ +static struct process_stats zru = {{0L, 0L}, {0L, 0L}, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; +# else /* !_SEQUENT_ */ +# ifdef _SX +static struct tms zru = {0, 0, 0, 0}, lru = {0, 0, 0, 0}; +# else /* !_SX */ +static struct tms zru = {0L, 0L, 0L, 0L}, lru = {0L, 0L, 0L, 0L}; +# endif /* !_SX */ +# endif /* !_SEQUENT_ */ +#endif /* !BSDTIMES */ + +#ifndef BSDTIMES +static int timesdone; /* shtimes buffer full ? */ +#endif /* BSDTIMES */ + +#ifndef RUSAGE_CHILDREN +# define RUSAGE_CHILDREN -1 +#endif /* RUSAGE_CHILDREN */ + +static void pflushall (void); +static void pflush (struct process *); +static void pfree (struct process *); +static void pclrcurr (struct process *); +static void morecommand (size_t); +static void padd (struct command *); +static int pprint (struct process *, int); +static void ptprint (struct process *); +static void pads (Char *); +static void pkill (Char **, int); +static struct process *pgetcurr (struct process *); +static void okpcntl (void); +static void setttypgrp (int); + +/* + * pchild - call queued 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! + */ +void +pchild(void) +{ + struct process *pp; + struct process *fp; + pid_t pid; +#ifdef BSDWAIT + union wait w; +#else /* !BSDWAIT */ + int w; +#endif /* !BSDWAIT */ + int jobflags; +#ifdef BSDTIMES + struct sysrusage ru; +#else /* !BSDTIMES */ +# ifdef _SEQUENT_ + struct process_stats ru; + struct process_stats cpst1, cpst2; + timeval_t tv; +# else /* !_SEQUENT_ */ + struct tms proctimes; + + if (!timesdone) { + timesdone++; + (void) times(&shtimes); + } +# endif /* !_SEQUENT_ */ +#endif /* !BSDTIMES */ + + jobdebug_xprintf(("pchild()\n")); + +loop: + jobdebug_xprintf(("Waiting...\n")); + jobdebug_flush(); + errno = 0; /* reset, just in case */ + +#ifndef WINNT_NATIVE +# ifdef BSDJOBS +# ifdef BSDTIMES +# ifdef convex + /* use 'cvxwait' to get parallel statistics */ + pid = cvxwait(&w, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); +# else + /* both a wait3 and rusage */ +# if !defined(BSDWAIT) || defined(NeXT) || defined(MACH) || defined(__linux__) || defined(__GNU__) || defined(__GLIBC__) || (defined(IRIS4D) && SYSVREL <= 3) || defined(__lucid) || defined(__osf__) + pid = wait3(&w, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); +# else /* BSDWAIT */ + pid = wait3(&w.w_status, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); +# endif /* BSDWAIT */ +# endif /* convex */ +# else /* !BSDTIMES */ +# ifdef _SEQUENT_ + (void) get_process_stats(&tv, PS_SELF, 0, &cpst1); + pid = waitpid(-1, &w, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); + (void) get_process_stats(&tv, PS_SELF, 0, &cpst2); + pr_stat_sub(&cpst2, &cpst1, &ru); +# else /* !_SEQUENT_ */ +# ifndef POSIX + /* we have a wait3, but no rusage stuff */ + pid = wait3(&w.w_status, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0); +# else /* POSIX */ + pid = waitpid(-1, &w, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); +# endif /* POSIX */ +# endif /* !_SEQUENT_ */ +# endif /* !BSDTIMES */ +# else /* !BSDJOBS */ +# ifdef BSDTIMES +# define HAVEwait3 + /* both a wait3 and rusage */ +# ifdef hpux + pid = wait3(&w.w_status, WNOHANG, 0); +# else /* !hpux */ +# ifndef BSDWAIT + pid = wait3(&w, WNOHANG, &ru); +# else + pid = wait3(&w.w_status, WNOHANG, &ru); +# endif /* BSDWAIT */ +# endif /* !hpux */ +# else /* !BSDTIMES */ +# ifdef ODT /* For Sco Unix 3.2.0 or ODT 1.0 */ +# define HAVEwait3 + pid = waitpid(-1, &w, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); +# endif /* ODT */ +# if defined(aiws) || defined(uts) +# define HAVEwait3 + pid = wait3(&w.w_status, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), 0); +# endif /* aiws || uts */ +# ifndef HAVEwait3 +# ifndef BSDWAIT + /* no wait3, therefore no rusage */ + /* on Sys V, this may hang. I hope it's not going to be a problem */ + pid = wait(&w); +# else /* BSDWAIT */ + /* + * XXX: for greater than 3 we should use waitpid(). + * but then again, SVR4 falls into the POSIX/BSDJOBS category. + */ + pid = wait(&w.w_status); +# endif /* BSDWAIT */ +# endif /* !HAVEwait3 */ +# endif /* !BSDTIMES */ +# endif /* !BSDJOBS */ +#else /* WINNT_NATIVE */ + pid = waitpid(-1, &w, + (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG)); +#endif /* WINNT_NATIVE */ + + jobdebug_xprintf(("parent %d pid %d, retval %x termsig %x retcode %x\n", + (int)getpid(), (int)pid, w, WTERMSIG(w), + WEXITSTATUS(w))); + jobdebug_flush(); + + if ((pid == 0) || (pid == -1)) { + (void)handle_pending_signals(); + jobdebug_xprintf(("errno == %d\n", errno)); + if (errno == EINTR) + goto loop; + goto end; + } + for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) + if (pid == pp->p_procid) + goto found; +#if !defined(BSDJOBS) && !defined(WINNT_NATIVE) + /* this should never have happened */ + stderror(ERR_SYNC, pid); + xexit(0); +#else /* BSDJOBS || WINNT_NATIVE */ + goto loop; +#endif /* !BSDJOBS && !WINNT_NATIVE */ +found: + 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)) +#ifndef BSDTIMES +# ifdef _SEQUENT_ + (void) get_process_stats(&pp->p_etime, PS_SELF, NULL, NULL); +# else /* !_SEQUENT_ */ + pp->p_etime = times(&proctimes); +# endif /* !_SEQUENT_ */ +#else /* BSDTIMES */ + (void) gettimeofday(&pp->p_etime, NULL); +#endif /* BSDTIMES */ + + +#if defined(BSDTIMES) || defined(_SEQUENT_) + pp->p_rusage = ru; +#else /* !BSDTIMES && !_SEQUENT_ */ + (void) times(&proctimes); + pp->p_utime = proctimes.tms_cutime - shtimes.tms_cutime; + pp->p_stime = proctimes.tms_cstime - shtimes.tms_cstime; + shtimes = proctimes; +#endif /* !BSDTIMES && !_SEQUENT_ */ + 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) && +#ifdef BSDTIMES + fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec +#else /* !BSDTIMES */ +# ifdef _SEQUENT_ + fp->p_rusage.ps_utime.tv_sec + fp->p_rusage.ps_stime.tv_sec +# else /* !_SEQUENT_ */ +# ifndef POSIX + (fp->p_utime + fp->p_stime) / HZ +# else /* POSIX */ + (fp->p_utime + fp->p_stime) / clk_tck +# endif /* POSIX */ +# endif /* !_SEQUENT_ */ +#endif /* !BSDTIMES */ + >= atoi(short2str(varval(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_procid != 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 notdef + jobflags & PAEXITED || +#endif /* notdef */ + fp->p_cwd == NULL || + !eq(dcwd->di_name, fp->p_cwd->di_name))) { + /* PWP: print a newline after ^C */ + if (jobflags & PINTERRUPTED) { + xputchar('\r' | QUOTE); + xputchar('\n'); + } +#ifdef notdef + else if ((jobflags & (PTIME|PSTOPPED)) == PTIME) + ptprint(fp); +#endif /* notdef */ + } + } + else { + if (jobflags & PNOTIFY || adrof(STRnotify)) { + xputchar('\r' | QUOTE); + xputchar('\n'); + (void) pprint(pp, NUMBER | NAME | REASON); + if ((jobflags & PSTOPPED) == 0) + pflush(pp); + if (GettingInput) { + errno = 0; + (void) Rawmode(); +#ifdef notdef + /* + * don't really want to do that, because it + * will erase our message in case of multi-line + * input + */ + ClearLines(); +#endif /* notdef */ + ClearDisp(); + Refresh(); + } + } + else { + fp->p_flags |= PNEEDNOTE; + neednote = 1; + } + } + } +#if defined(BSDJOBS) || defined(HAVEwait3) ||defined(WINNT_NATIVE) + goto loop; +#endif /* BSDJOBS || HAVEwait3 */ + end: + ; +} + +void +pnote(void) +{ + struct process *pp; + int flags; + + neednote = 0; + for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) { + if (pp->p_flags & PNEEDNOTE) { + pchild_disabled++; + cleanup_push(&pchild_disabled, disabled_cleanup); + pp->p_flags &= ~PNEEDNOTE; + flags = pprint(pp, NUMBER | NAME | REASON); + if ((flags & (PRUNNING | PSTOPPED)) == 0) + pflush(pp); + cleanup_until(&pchild_disabled); + } + } +} + + +static void +pfree(struct process *pp) +{ + xfree(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(pp); +} + + +/* + * pwait - wait for current job to terminate, maintaining integrity + * of current and previous job indicators. + */ +void +pwait(void) +{ + struct process *fp, *pp; + + /* + * Here's where dead procs get flushed. + */ + for (pp = (fp = &proclist)->p_next; pp != NULL; pp = (fp = pp)->p_next) + if (pp->p_procid == 0) { + fp->p_next = pp->p_next; + pfree(pp); + pp = fp; + } + 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; + int jobflags, reason; + sigset_t oset, set, pause_mask; + Char *reason_str; + + while (pp->p_procid != pp->p_jobid) + pp = pp->p_friends; + fp = pp; + + do { + if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING) + xprintf("%s", CGETS(17, 1, "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(&set); + sigaddset(&set, SIGINT); + sigaddset(&set, SIGCHLD); + (void)sigprocmask(SIG_BLOCK, &set, &oset); + cleanup_push(&oset, sigprocmask_cleanup); + pause_mask = oset; + sigdelset(&pause_mask, SIGCHLD); + for (;;) { + (void)handle_pending_signals(); + jobflags = 0; + do + jobflags |= fp->p_flags; + while ((fp = (fp->p_friends)) != pp); + if ((jobflags & PRUNNING) == 0) + break; + jobdebug_xprintf(("%d starting to sigsuspend for SIGCHLD on %d\n", + getpid(), fp->p_procid)); + sigsuspend(&pause_mask); + } + cleanup_until(&oset); + jobdebug_xprintf(("%d returned from sigsuspend loop\n", getpid())); +#ifdef BSDJOBS + if (tpgrp > 0) /* get tty back */ + (void) tcsetpgrp(FSHTTY, tpgrp); +#endif /* BSDJOBS */ + if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) || + fp->p_cwd == NULL || !eq(dcwd->di_name, fp->p_cwd->di_name)) { + if (jobflags & PSTOPPED) { + xputchar('\n'); + if (adrof(STRlistjobs)) { + Char *jobcommand[3]; + + jobcommand[0] = STRjobs; + if (eq(varval(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); + /* NOTREACHED */ + } + reason = 0; + fp = pp; + do { + /* In case of pipelines only the result of the last + * command should be taken in account */ + if (!anyerror && !(fp->p_flags & PBRACE) + && ((fp->p_flags & PPOU) || (fp->p_flags & PBACKQ))) + continue; + if (fp->p_reason) + reason = fp->p_flags & (PSIGNALED | PINTERRUPTED) ? + fp->p_reason | META : fp->p_reason; + } while ((fp = fp->p_friends) != pp); + /* + * Don't report on backquoted jobs, cause it will mess up + * their output. + */ + if ((reason != 0) && (adrof(STRprintexitvalue)) && + (pp->p_flags & PBACKQ) == 0) + xprintf(CGETS(17, 2, "Exit %d\n"), reason); + reason_str = putn((tcsh_number_t)reason); + cleanup_push(reason_str, xfree); + setv(STRstatus, reason_str, VAR_READWRITE); + cleanup_ignore(reason_str); + cleanup_until(reason_str); + if (reason && exiterr) + exitstat(); + pflush(pp); +} + +/* + * dowait - wait for all processes to finish + */ + +/*ARGSUSED*/ +void +dowait(Char **v, struct command *c) +{ + struct process *pp; + sigset_t pause_mask; + int opintr_disabled, gotsig; + + USE(c); + USE(v); + pjobs++; + sigprocmask(SIG_BLOCK, NULL, &pause_mask); + sigdelset(&pause_mask, SIGCHLD); + if (setintr) + sigdelset(&pause_mask, SIGINT); +loop: + for (pp = proclist.p_next; pp; pp = pp->p_next) + if (pp->p_procid && /* pp->p_procid == pp->p_jobid && */ + pp->p_flags & PRUNNING) { + (void)handle_pending_signals(); + sigsuspend(&pause_mask); + opintr_disabled = pintr_disabled; + pintr_disabled = 0; + gotsig = handle_pending_signals(); + pintr_disabled = opintr_disabled; + if (gotsig) + break; + goto loop; + } + 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_procid) + 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_procid == 0) { + xprintf("%s", CGETS(17, 3, "BUG: process flushed twice")); + return; + } + while (pp->p_procid != 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_procid = 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 *cmdstr; +static size_t cmdmax; +static size_t cmdlen; +static Char *cmdp; +#define CMD_INIT 1024 +#define CMD_INCR 64 + +static void +morecommand(size_t s) +{ + Char *ncmdstr; + ptrdiff_t d; + + cmdmax += s; + ncmdstr = xrealloc(cmdstr, cmdmax * sizeof(*cmdstr)); + d = ncmdstr - cmdstr; + cmdstr = ncmdstr; + cmdp += d; +} + +/* GrP + * unparse - Export padd() functionality + */ +Char * +unparse(struct command *t) +{ + if (cmdmax == 0) + morecommand(CMD_INIT); + cmdp = cmdstr; + cmdlen = 0; + padd(t); + *cmdp++ = '\0'; + return Strsave(cmdstr); +} + + +/* + * palloc - allocate a process structure and fill it up. + * an important assumption is made that the process is running. + */ +void +palloc(pid_t pid, struct command *t) +{ + struct process *pp; + int i; + + pp = xcalloc(1, sizeof(struct process)); + pp->p_procid = pid; + pp->p_parentid = shpgrp; + pp->p_flags = ((t->t_dflg & F_AMPERSAND) ? 0 : PFOREGND) | PRUNNING; + if (t->t_dflg & F_TIME) + pp->p_flags |= PPTIME; + if (t->t_dflg & F_BACKQ) + pp->p_flags |= PBACKQ; + if (t->t_dflg & F_HUP) + pp->p_flags |= PHUP; + if (t->t_dcom && t->t_dcom[0] && (*t->t_dcom[0] == '{')) + pp->p_flags |= PBRACE; + if (cmdmax == 0) + morecommand(CMD_INIT); + cmdp = cmdstr; + 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 |= PDIAG; + } + pp->p_command = Strsave(cmdstr); + 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_procid; + 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; +#ifdef BSDTIMES + (void) gettimeofday(&pp->p_btime, NULL); +#else /* !BSDTIMES */ +# ifdef _SEQUENT_ + (void) get_process_stats(&pp->p_btime, PS_SELF, NULL, NULL); +# else /* !_SEQUENT_ */ + { + struct tms tmptimes; + + pp->p_btime = times(&tmptimes); + } +# endif /* !_SEQUENT_ */ +#endif /* !BSDTIMES */ +} + +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; + default: + break; + } + padd(t->t_dcdr); + return; + + default: + break; + } + 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) +{ + size_t i, len; + + /* + * 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); + + len = cmdlen + i + CMD_INCR; + if (len >= cmdmax) + morecommand(len); + (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; +} + +void +psavejob_cleanup(void *dummy) +{ + USE(dummy); + 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; + pcurrjob = NULL; + while (pp->p_procid != pp->p_jobid) + pp = pp->p_friends; + xprintf("[%d]", pp->p_index); + tp = pp; + do { + xprintf(" %d", pp->p_procid); + pp = pp->p_friends; + } while (pp != tp); + xputchar('\n'); + } + pholdjob = pcurrjob = 0; +} + +/* + * pprint - print a job + */ + +/* + * Hacks have been added for SVR4 to deal with pipe's being spawned in + * reverse order + * + * David Dawes (dawes@physics.su.oz.au) Oct 1991 + */ + +static int +pprint(struct process *pp, int flag) +{ + int status, reason; + struct process *tp; + int jobflags, pstatus, pcond; + const char *format; + +#ifdef BACKPIPE + struct process *pipehead = NULL, *pipetail = NULL, *pmarker = NULL; + int inpipe = 0; +#endif /* BACKPIPE */ + + while (pp->p_procid != 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 { +#ifdef BACKPIPE + /* + * The pipeline is reversed, so locate the real head of the pipeline + * if pp is at the tail of a pipe (and not already in a pipeline) + */ + if ((pp->p_friends->p_flags & PPOU) && !inpipe && (flag & NAME)) { + inpipe = 1; + pipetail = pp; + do + pp = pp->p_friends; + while (pp->p_friends->p_flags & PPOU); + pipehead = pp; + pmarker = pp; + /* + * pmarker is used to hold the place of the proc being processed, so + * we can search for the next one downstream later. + */ + } + pcond = (tp != pp || (inpipe && tp == pp)); +#else /* !BACKPIPE */ + pcond = (tp != pp); +#endif /* BACKPIPE */ + + jobflags |= pp->p_flags; + pstatus = (int) (pp->p_flags & PALLSTATES); + if (pcond && linp != linbuf && !(flag & FANCY) && + ((pstatus == status && pp->p_reason == reason) || + !(flag & REASON))) + xputchar(' '); + else { + if (pcond && linp != linbuf) + xputchar('\n'); + if (flag & NUMBER) { +#ifdef BACKPIPE + pcond = ((pp == tp && !inpipe) || + (inpipe && pipetail == tp && pp == pipehead)); +#else /* BACKPIPE */ + pcond = (pp == tp); +#endif /* BACKPIPE */ + if (pcond) + xprintf("[%d]%s %c ", pp->p_index, + pp->p_index < 10 ? " " : "", + pp == pcurrent ? '+' : + (pp == pprevious ? '-' : ' ')); + else + xprintf(" "); + } + if (flag & FANCY) { + xprintf("%5d ", pp->p_procid); +#ifdef TCF + xprintf("%11s ", sitename(pp->p_procid)); +#endif /* TCF */ + } + if (flag & (REASON | AREASON)) { + if (flag & NAME) + format = "%-30s"; + else + format = "%s"; + if (pstatus == status) { + if (pp->p_reason == reason) { + xprintf(format, ""); + goto prcomd; + } + else + reason = (int) pp->p_reason; + } + else { + status = pstatus; + reason = (int) pp->p_reason; + } + switch (status) { + + case PRUNNING: + xprintf(format, CGETS(17, 4, "Running ")); + break; + + case PINTERRUPTED: + case PSTOPPED: + case PSIGNALED: + /* + * tell what happened to the background job + * From: Michael Schroeder + * <mlschroe@immd4.informatik.uni-erlangen.de> + */ + if ((flag & REASON) + || ((flag & AREASON) + && reason != SIGINT + && (reason != SIGPIPE + || (pp->p_flags & PPOU) == 0))) { + char *ptr; + int free_ptr; + + free_ptr = 0; + ptr = (char *)(intptr_t)mesg[pp->p_reason & 0177].pname; + if (ptr == NULL) { + ptr = xasprintf("%s %d", CGETS(17, 5, "Signal"), + pp->p_reason & 0177); + cleanup_push(ptr, xfree); + free_ptr = 1; + } + xprintf(format, ptr); + if (free_ptr != 0) + cleanup_until(ptr); + } + else + reason = -1; + break; + + case PNEXITED: + case PAEXITED: + if (flag & REASON) { + if (pp->p_reason) + xprintf(CGETS(17, 6, "Exit %-25d"), pp->p_reason); + else + xprintf(format, CGETS(17, 7, "Done")); + } + break; + + default: + xprintf(CGETS(17, 8, "BUG: status=%-9o"), + status); + } + } + } +prcomd: + if (flag & NAME) { + xprintf("%S", pp->p_command); + if (pp->p_flags & PPOU) + xprintf(" |"); + if (pp->p_flags & PDIAG) + xprintf("&"); + } + if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED) + xprintf("%s", CGETS(17, 9, " (core dumped)")); + if (tp == pp->p_friends) { + if (flag & AMPERSAND) + xprintf(" &"); + if (flag & JOBDIR && + !eq(tp->p_cwd->di_name, dcwd->di_name)) { + xprintf("%s", CGETS(17, 10, " (wd: ")); + dtildepr(tp->p_cwd->di_name); + xprintf(")"); + } + } + if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) { + if (linp != linbuf) + xprintf("\n\t"); +#if defined(BSDTIMES) || defined(_SEQUENT_) + prusage(&zru, &pp->p_rusage, &pp->p_etime, + &pp->p_btime); +#else /* !BSDTIMES && !SEQUENT */ + lru.tms_utime = pp->p_utime; + lru.tms_stime = pp->p_stime; + lru.tms_cutime = 0; + lru.tms_cstime = 0; + prusage(&zru, &lru, pp->p_etime, + pp->p_btime); +#endif /* !BSDTIMES && !SEQUENT */ + + } +#ifdef BACKPIPE + pcond = ((tp == pp->p_friends && !inpipe) || + (inpipe && pipehead->p_friends == tp && pp == pipetail)); +#else /* !BACKPIPE */ + pcond = (tp == pp->p_friends); +#endif /* BACKPIPE */ + if (pcond) { + if (linp != linbuf) + xputchar('\n'); + if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) { + xprintf("%s", CGETS(17, 11, "(wd now: ")); + dtildepr(dcwd->di_name); + xprintf(")\n"); + } + } +#ifdef BACKPIPE + if (inpipe) { + /* + * if pmaker == pipetail, we are finished that pipeline, and + * can now skip to past the head + */ + if (pmarker == pipetail) { + inpipe = 0; + pp = pipehead; + } + else { + /* + * set pp to one before the one we want next, so the while below + * increments to the correct spot. + */ + do + pp = pp->p_friends; + while (pp->p_friends->p_friends != pmarker); + pmarker = pp->p_friends; + } + } + pcond = ((pp = pp->p_friends) != tp || inpipe); +#else /* !BACKPIPE */ + pcond = ((pp = pp->p_friends) != tp); +#endif /* BACKPIPE */ + } while (pcond); + + if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) { + if (jobflags & NUMBER) + xprintf(" "); + ptprint(tp); + } + return (jobflags); +} + +/* + * All 4.3 BSD derived implementations are buggy and I've had enough. + * The following implementation produces similar code and works in all + * cases. The 4.3BSD one works only for <, >, != + */ +# undef timercmp +# define timercmp(tvp, uvp, cmp) \ + (((tvp)->tv_sec == (uvp)->tv_sec) ? \ + ((tvp)->tv_usec cmp (uvp)->tv_usec) : \ + ((tvp)->tv_sec cmp (uvp)->tv_sec)) + +static void +ptprint(struct process *tp) +{ +#ifdef BSDTIMES + struct timeval tetime, diff; + static struct timeval ztime; + struct sysrusage ru; + struct process *pp = tp; + + ru = zru; + tetime = ztime; + do { + ruadd(&ru, &pp->p_rusage); + tvsub(&diff, &pp->p_etime, &pp->p_btime); + if (timercmp(&diff, &tetime, >)) + tetime = diff; + } while ((pp = pp->p_friends) != tp); + prusage(&zru, &ru, &tetime, &ztime); +#else /* !BSDTIMES */ +# ifdef _SEQUENT_ + timeval_t tetime, diff; + static timeval_t ztime; + struct process_stats ru; + struct process *pp = tp; + + ru = zru; + tetime = ztime; + do { + ruadd(&ru, &pp->p_rusage); + tvsub(&diff, &pp->p_etime, &pp->p_btime); + if (timercmp(&diff, &tetime, >)) + tetime = diff; + } while ((pp = pp->p_friends) != tp); + prusage(&zru, &ru, &tetime, &ztime); +# else /* !_SEQUENT_ */ +# ifndef POSIX + static time_t ztime = 0; + static time_t zu_time = 0; + static time_t zs_time = 0; + time_t tetime, diff; + time_t u_time, s_time; + +# else /* POSIX */ + static clock_t ztime = 0; + static clock_t zu_time = 0; + static clock_t zs_time = 0; + clock_t tetime, diff; + clock_t u_time, s_time; + +# endif /* POSIX */ + struct tms zts, rts; + struct process *pp = tp; + + u_time = zu_time; + s_time = zs_time; + tetime = ztime; + do { + u_time += pp->p_utime; + s_time += pp->p_stime; + diff = pp->p_etime - pp->p_btime; + if (diff > tetime) + tetime = diff; + } while ((pp = pp->p_friends) != tp); + zts.tms_utime = zu_time; + zts.tms_stime = zs_time; + zts.tms_cutime = 0; + zts.tms_cstime = 0; + rts.tms_utime = u_time; + rts.tms_stime = s_time; + rts.tms_cutime = 0; + rts.tms_cstime = 0; + prusage(&zts, &rts, tetime, ztime); +# endif /* !_SEQUENT_ */ +#endif /* !BSDTIMES */ +} + +/* + * dojobs - print all jobs + */ +/*ARGSUSED*/ +void +dojobs(Char **v, struct command *c) +{ + struct process *pp; + int flag = NUMBER | NAME | REASON; + int i; + + USE(c); + 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_procid == pp->p_jobid) { + pp->p_flags &= ~PNEEDNOTE; + if (!(pprint(pp, flag) & (PRUNNING | PSTOPPED))) + pflush(pp); + break; + } +} + +/* + * dofg - builtin - put the job into the foreground + */ +/*ARGSUSED*/ +void +dofg(Char **v, struct command *c) +{ + struct process *pp; + + USE(c); + okpcntl(); + ++v; + do { + pp = pfind(*v); + if (!pstart(pp, 1)) { + pp->p_procid = 0; + stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); + continue; + } + pjwait(pp); + } while (*v && *++v); +} + +/* + * %... - builtin - put the job into the foreground + */ +/*ARGSUSED*/ +void +dofg1(Char **v, struct command *c) +{ + struct process *pp; + + USE(c); + okpcntl(); + pp = pfind(v[0]); + if (!pstart(pp, 1)) { + pp->p_procid = 0; + stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); + return; + } + pjwait(pp); +} + +/* + * dobg - builtin - put the job into the background + */ +/*ARGSUSED*/ +void +dobg(Char **v, struct command *c) +{ + struct process *pp; + + USE(c); + okpcntl(); + ++v; + do { + pp = pfind(*v); + if (!pstart(pp, 0)) { + pp->p_procid = 0; + stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); + } + } while (*v && *++v); +} + +/* + * %... & - builtin - put the job into the background + */ +/*ARGSUSED*/ +void +dobg1(Char **v, struct command *c) +{ + struct process *pp; + + USE(c); + pp = pfind(v[0]); + if (!pstart(pp, 0)) { + pp->p_procid = 0; + stderror(ERR_NAME|ERR_BADJOB, pp->p_command, strerror(errno)); + } +} + +/* + * dostop - builtin - stop the job + */ +/*ARGSUSED*/ +void +dostop(Char **v, struct command *c) +{ + USE(c); +#ifdef BSDJOBS + pkill(++v, SIGSTOP); +#endif /* BSDJOBS */ +} + +/* + * dokill - builtin - superset of kill (1) + */ +/*ARGSUSED*/ +void +dokill(Char **v, struct command *c) +{ + int signum, len = 0; + const char *name; + Char *sigptr; + + USE(c); + v++; + if (v[0] && v[0][0] == '-') { + if (v[0][1] == 'l') { + for (signum = 0; signum <= nsig; signum++) { + if ((name = mesg[signum].iname) != NULL) { + len += strlen(name) + 1; + if (len >= TermH - 1) { + xputchar('\n'); + len = strlen(name) + 1; + } + xprintf("%s ", name); + } + } + xputchar('\n'); + return; + } + sigptr = &v[0][1]; + if (v[0][1] == 's') { + if (v[1]) { + v++; + sigptr = &v[0][0]; + } else { + stderror(ERR_NAME | ERR_TOOFEW); + } + } + if (Isdigit(*sigptr)) { + char *ep; + signum = strtoul(short2str(sigptr), &ep, 0); + if (*ep || signum < 0 || signum > (MAXSIG-1)) + stderror(ERR_NAME | ERR_BADSIG); + } + else { + for (signum = 0; signum <= nsig; signum++) + if (mesg[signum].iname && + eq(sigptr, str2short(mesg[signum].iname))) + goto gotsig; + setname(short2str(sigptr)); + stderror(ERR_NAME | ERR_UNKSIG); + } +gotsig: + v++; + } + else + signum = SIGTERM; + pkill(v, signum); +} + +static void +pkill(Char **v, int signum) +{ + struct process *pp, *np; + int jobflags = 0, err1 = 0; + pid_t pid; + Char *cp, **vp, **globbed; + + /* Avoid globbing %?x patterns */ + for (vp = v; vp && *vp; vp++) + if (**vp == '%') + (void) quote(*vp); + + v = glob_all_or_error(v); + globbed = v; + cleanup_push(globbed, blk_cleanup); + + pchild_disabled++; + cleanup_push(&pchild_disabled, disabled_cleanup); + if (setintr) { + pintr_disabled++; + cleanup_push(&pintr_disabled, disabled_cleanup); + } + + while (v && (cp = *v)) { + if (*cp == '%') { + np = pp = pfind(cp); + do + jobflags |= np->p_flags; + while ((np = np->p_friends) != pp); +#ifdef BSDJOBS + switch (signum) { + + case SIGSTOP: + case SIGTSTP: + case SIGTTIN: + case SIGTTOU: + if ((jobflags & PRUNNING) == 0) { +# ifdef SUSPENDED + xprintf(CGETS(17, 12, "%S: Already suspended\n"), cp); +# else /* !SUSPENDED */ + xprintf(CGETS(17, 13, "%S: Already stopped\n"), cp); +# endif /* !SUSPENDED */ + 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: + if (!pstart(pp, 0)) { + pp->p_procid = 0; + stderror(ERR_NAME|ERR_BADJOB, pp->p_command, + strerror(errno)); + } + goto cont; + default: + break; + } +#endif /* BSDJOBS */ + if (killpg(pp->p_jobid, signum) < 0) { + xprintf("%S: %s\n", cp, strerror(errno)); + err1++; + } +#ifdef BSDJOBS + if (signum == SIGTERM || signum == SIGHUP) + (void) killpg(pp->p_jobid, SIGCONT); +#endif /* BSDJOBS */ + } + else if (!(Isdigit(*cp) || *cp == '-')) + stderror(ERR_NAME | ERR_JOBARGS); + else { + char *ep; +#ifndef WINNT_NATIVE + pid = strtol(short2str(cp), &ep, 10); +#else + pid = strtoul(short2str(cp), &ep, 0); +#endif /* WINNT_NATIVE */ + if (*ep) + stderror(ERR_NAME | ERR_JOBARGS); + else if (kill(pid, signum) < 0) { + xprintf("%d: %s\n", pid, strerror(errno)); + err1++; + goto cont; + } +#ifdef BSDJOBS + if (signum == SIGTERM || signum == SIGHUP) + (void) kill(pid, SIGCONT); +#endif /* BSDJOBS */ + } +cont: + v++; + } + cleanup_until(&pchild_disabled); + if (err1) + stderror(ERR_SILENT); +} + +/* + * pstart - start the job in foreground/background + */ +int +pstart(struct process *pp, int foregnd) +{ + int rv = 0; + struct process *np; + /* We don't use jobflags in this function right now (see below) */ + /* long jobflags = 0; */ + + pchild_disabled++; + cleanup_push(&pchild_disabled, disabled_cleanup); + np = pp; + do { + /* We don't use jobflags in this function right now (see below) */ + /* 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); + + /* GrP run jobcmd hook if foregrounding */ + if (foregnd) { + job_cmd(pp->p_command); + } + +#ifdef BSDJOBS + if (foregnd) { + rv = tcsetpgrp(FSHTTY, pp->p_jobid); + } + /* + * 1. child process of csh (shell script) receives SIGTTIN/SIGTTOU + * 2. parent process (csh) receives SIGCHLD + * 3. The "csh" signal handling function pchild() is invoked + * with a SIGCHLD signal. + * 4. pchild() calls wait3(WNOHANG) which returns 0. + * The child process is NOT ready to be waited for at this time. + * pchild() returns without picking-up the correct status + * for the child process which generated the SIGCHLD. + * 5. CONSEQUENCE : csh is UNaware that the process is stopped + * 6. THIS LINE HAS BEEN COMMENTED OUT : if (jobflags&PSTOPPED) + * (beto@aixwiz.austin.ibm.com - aug/03/91) + * 7. I removed the line completely and added extra checks for + * pstart, so that if a job gets attached to and dies inside + * a debugger it does not confuse the shell. [christos] + * 8. on the nec sx-4 there seems to be a problem, which requires + * a syscall(151, getpid(), getpid()) in osinit. Don't ask me + * what this is doing. [schott@rzg.mpg.de] + */ + + if (rv != -1) + rv = killpg(pp->p_jobid, SIGCONT); +#endif /* BSDJOBS */ + cleanup_until(&pchild_disabled); + return rv != -1; +} + +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_procid == 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_procid == 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 */ + return (0); +} + + +/* + * pgetcurr - find most recent job that is not pp, preferably stopped + */ +static struct process * +pgetcurr(struct process *pp) +{ + struct process *np; + struct process *xp = NULL; + + for (np = proclist.p_next; np; np = np->p_next) + if (np != pcurrent && np != pp && np->p_procid && + np->p_procid == 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 + */ +/*ARGSUSED*/ +void +donotify(Char **v, struct command *c) +{ + struct process *pp; + + USE(c); + pp = pfind(*++v); + pp->p_flags |= PNOTIFY; +} + +#ifdef SIGSYNCH +static void +synch_handler(int sno) +{ + USE(sno); +} +#endif /* SIGSYNCH */ + +/* + * 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. + */ + +pid_t +pfork(struct command *t, int wanttty) +{ + pid_t pid; + int ignint = 0; + pid_t pgrp; +#ifdef SIGSYNCH + struct sigaction osa, nsa; +#endif /* SIGSYNCH */ + + /* + * 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); +#ifdef SIGSYNCH + nsa.sa_handler = synch_handler; + sigfillset(&nsa.sa_mask); + nsa.sa_flags = SA_RESTART; + if (sigaction(SIGSYNCH, &nsa, &osa)) + stderror(ERR_SYSTEM, "pfork: sigaction set", strerror(errno)); +#endif /* SIGSYNCH */ + /* + * Hold pchild() until we have the process installed in our table. + */ + if (wanttty < 0) { + pchild_disabled++; + cleanup_push(&pchild_disabled, disabled_cleanup); + } + while ((pid = fork()) == -1) + if (setintr == 0) + (void) sleep(FORKSLEEP); + else + stderror(ERR_NOPROC); + if (pid == 0) { + (void)cleanup_push_mark(); /* Never to be popped */ + pchild_disabled = 0; + settimes(); + pgrp = pcurrjob ? pcurrjob->p_jobid : getpid(); + pflushall(); + pcurrjob = NULL; +#if !defined(BSDTIMES) && !defined(_SEQUENT_) + timesdone = 0; +#endif /* !defined(BSDTIMES) && !defined(_SEQUENT_) */ + 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); +#ifdef BSDJOBS + if (wanttty >= 0) { + /* make stoppable */ + (void) signal(SIGTSTP, SIG_DFL); + (void) signal(SIGTTIN, SIG_DFL); + (void) signal(SIGTTOU, SIG_DFL); + } +#endif /* BSDJOBS */ + sigaction(SIGTERM, &parterm, NULL); + } + else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) { + (void) signal(SIGINT, SIG_IGN); + (void) signal(SIGQUIT, SIG_IGN); + } +#ifdef OREO + signal(SIGIO, SIG_IGN); /* ignore SIGIO in child too */ +#endif /* OREO */ + + 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) { + int nval = SIGN_EXTEND_CHAR(t->t_nice); +#ifdef HAVE_SETPRIORITY + if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno) + stderror(ERR_SYSTEM, "setpriority", strerror(errno)); +#else /* !HAVE_SETPRIORITY */ + (void) nice(nval); +#endif /* !HAVE_SETPRIORITY */ + } +#ifdef F_VER + if (t->t_dflg & F_VER) { + tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53); + dohash(NULL, NULL); + } +#endif /* F_VER */ +#ifdef SIGSYNCH + /* rfw 8/89 now parent can continue */ + if (kill(getppid(), SIGSYNCH)) + stderror(ERR_SYSTEM, "pfork child: kill", strerror(errno)); +#endif /* SIGSYNCH */ + + } + else { +#ifdef POSIXJOBS + if (wanttty >= 0) { + /* + * `Walking' process group fix from Beto Appleton. + * (beto@aixwiz.austin.ibm.com) + * If setpgid fails at this point that means that + * our process leader has died. We flush the current + * job and become the process leader ourselves. + * The parent will figure that out later. + */ + pgrp = pcurrjob ? pcurrjob->p_jobid : pid; + if (setpgid(pid, pgrp) == -1 && errno == EPERM) { + pcurrjob = NULL; + /* + * We don't care if this causes an error here; + * then we are already in the right process group + */ + (void) setpgid(pid, pgrp = pid); + } + } +#endif /* POSIXJOBS */ + palloc(pid, t); +#ifdef SIGSYNCH + { + sigset_t pause_mask; + + /* + * rfw 8/89 Wait for child to own terminal. Solves half of ugly + * synchronization problem. With this change, we know that the only + * reason setpgrp to a previous process in a pipeline can fail is that + * the previous process has already exited. Without this hack, he may + * either have exited or not yet started to run. Two uglies become + * one. + */ + sigprocmask(SIG_BLOCK, NULL, &pause); + sigdelset(&pause_mask, SIGCHLD); + sigdelset(&pause_mask, SIGSYNCH); + sigsuspend(&pause_mask); + (void)handle_pending_signals(); + if (sigaction(SIGSYNCH, &osa, NULL)) + stderror(ERR_SYSTEM, "pfork parent: sigaction restore", + strerror(errno)); + } +#endif /* SIGSYNCH */ + + if (wanttty < 0) + cleanup_until(&pchild_disabled); + } + return (pid); +} + +static void +okpcntl(void) +{ + if (tpgrp == -1) + stderror(ERR_JOBCONTROL); + if (tpgrp == 0) + stderror(ERR_JOBCTRLSUB); +} + + +static void +setttypgrp(int pgrp) +{ + /* + * If we are piping out a builtin, eg. 'echo | more' things can go + * out of sequence, i.e. the more can run before the echo. This + * can happen even if we have vfork, since the echo will be forked + * with the regular fork. In this case, we need to set the tty + * pgrp ourselves. If that happens, then the process will be still + * alive. And the tty process group will already be set. + * This should fix the famous sequent problem as a side effect: + * The controlling terminal is lost if all processes in the + * terminal process group are zombies. In this case tcgetpgrp() + * returns 0. If this happens we must set the terminal process + * group again. + */ + if (tcgetpgrp(FSHTTY) != pgrp) { +#ifdef POSIXJOBS + struct sigaction old; + + /* + * tcsetpgrp will set SIGTTOU to all the the processes in + * the background according to POSIX... We ignore this here. + */ + sigaction(SIGTTOU, NULL, &old); + signal(SIGTTOU, SIG_IGN); +#endif + (void) tcsetpgrp(FSHTTY, pgrp); +# ifdef POSIXJOBS + sigaction(SIGTTOU, &old, NULL); +# endif + + } +} + + +/* + * 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), when they do. 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, pid_t pgrp) +{ +#ifdef BSDJOBS +# ifdef POSIXJOBS + sigset_t oset, set; +# endif /* POSIXJOBS */ + + jobdebug_xprintf(("wanttty %d pid %d opgrp%d pgrp %d tpgrp %d\n", + wanttty, (int)getpid(), (int)pgrp, (int)mygetpgrp(), + (int)tcgetpgrp(FSHTTY))); +# ifdef POSIXJOBS + /* + * christos: I am blocking the tty signals till I've set things + * correctly.... + */ + if (wanttty > 0) { + sigemptyset(&set); + sigaddset(&set, SIGTSTP); + sigaddset(&set, SIGTTIN); + (void)sigprocmask(SIG_BLOCK, &set, &oset); + cleanup_push(&oset, sigprocmask_cleanup); + } +# endif /* POSIXJOBS */ + +# ifndef POSIXJOBS + if (wanttty > 0) + setttypgrp(pgrp); +# endif /* !POSIXJOBS */ + + /* + * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de> + * 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) { +# ifdef POSIXJOBS + /* Walking process group fix; see above */ + if (setpgid(0, pgrp = getpid()) == -1) { +# endif /* POSIXJOBS */ + stderror(ERR_SYSTEM, "setpgid child:\n", strerror(errno)); + xexit(0); +# ifdef POSIXJOBS + } + wanttty = pgrp; /* Now we really want the tty, since we became the + * the process group leader + */ +# endif /* POSIXJOBS */ + } + } + +# ifdef POSIXJOBS + if (wanttty > 0) { + setttypgrp(pgrp); + cleanup_until(&oset); + } +# endif /* POSIXJOBS */ + + jobdebug_xprintf(("wanttty %d pid %d pgrp %d tpgrp %d\n", + wanttty, getpid(), mygetpgrp(), tcgetpgrp(FSHTTY))); + + if (tpgrp > 0) + tpgrp = 0; /* gave tty away */ +#endif /* BSDJOBS */ +} |