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- /* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/sh.proc.c,v 3.9 1991/08/05 23:02:13 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. 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.
- */
- #include "config.h"
- RCSID("$Id: sh.proc.c,v 3.9 1991/08/05 23:02:13 christos Exp $")
-
- #include "sh.h"
- #include "ed.h"
- #include "tc.h"
-
- /*
- * a little complicated #include <sys/wait.h>! :-(
- */
- #if SVID > 0
- # ifdef hpux
- # ifndef __hpux
- # include "tc.wait.h" /* 6.5 broke <sys/wait.h> */
- # else
- # ifndef POSIX
- # define _BSD
- # endif
- # ifndef _CLASSIC_POSIX_TYPES
- # define _CLASSIC_POSIX_TYPES
- # endif
- # include <sys/wait.h> /* 7.0 fixed it again */
- # endif /* __hpux */
- # else /* hpux */
- # if defined(OREO) || defined(IRIS4D) || defined(POSIX)
- # include <sys/wait.h>
- # else /* OREO || IRIS4D || POSIX */
- # include "tc.wait.h"
- # endif /* OREO || IRIS4D || POSIX */
- # endif /* hpux */
- #else /* SVID == 0 */
- # include <sys/wait.h>
- #endif /* SVID == 0 */
-
- #if !defined(NSIG) && defined(SIGMAX)
- # define NSIG (SIGMAX+1)
- #endif /* !NSIG && SIGMAX */
-
- #ifdef aiws
- # undef HZ
- # define HZ 16
- #endif /* aiws */
-
- #ifndef HZ
- # define HZ 100 /* for division into seconds */
- #endif
-
- #if (defined(_BSD) && defined(_BSD_INCLUDES))
- # define BSDWAIT
- #endif
- #ifndef WTERMSIG
- # define WTERMSIG(w) (((union wait *) &(w))->w_termsig)
- # ifndef BSDWAIT
- # define BSDWAIT
- # endif
- #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 */
-
- #ifndef WCOREDUMP
- # ifdef BSDWAIT
- # define WCOREDUMP(w) (((union wait *) &(w))->w_coredump)
- # else /* !BSDWAIT */
- # define WCOREDUMP(w) ((w) & 0200)
- # endif /* !BSDWAIT */
- #endif /* !WCOREDUMP */
-
- /*
- * C Shell - functions that manage processes, handling hanging, termination
- */
-
- #define BIGINDEX 9 /* largest desirable job index */
-
- #ifdef BSDTIMES
- # if defined(sun) || defined(hp9000)
- static struct rusage zru = {{0L, 0L}, {0L, 0L}, 0L, 0L, 0L, 0L,
- 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L};
-
- # else /* !sun && !hp9000 */
- # if defined(masscomp) || defined(__MINT__)
- /*
- * Initialization of this structure under RTU 4.1A & RTU 5.0 is problematic
- * because the first two elements are unions of a time_t and a struct timeval.
- * So we'll just have to trust the loader to do the "right thing", DAS DEC-90.
- */
-
- /* MiNT is missing a lot of fields, so we also trust the loader (we can
- * trust it) to avoid getting errors from the compiler
- */
- static struct rusage zru;
- # else /* masscomp */
- static struct rusage zru = {{0L, 0L}, {0L, 0L}, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0};
- # endif /* masscomp */
- # endif /* !sun && !hp9000 */
- #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_ */
- static struct tms zru = {0L, 0L, 0L, 0L}, lru = {0L, 0L, 0L, 0L};
- # endif /* !_SEQUENT_ */
- #endif /* !BSDTIMES */
-
- #ifndef RUSAGE_CHILDREN
- # define RUSAGE_CHILDREN -1
- #endif
-
- static void pflushall __P((void));
- static void pflush __P((struct process *));
- static void pclrcurr __P((struct process *));
- static void padd __P((struct command *));
- static int pprint __P((struct process *, int));
- static void ptprint __P((struct process *));
- static void pads __P((Char *));
- static void pkill __P((Char **, int));
- static struct process *pgetcurr __P((struct process *));
- static void okpcntl __P((void));
-
- #ifdef __MINT__
- /*
- * MiNT's fork() is a lot like vfork() in some respects; in particular,
- * if we set job control signals to SIG_DFL after fork() and then
- * get a signal, our parent will never be able to reclaim the address
- * space and everything will hang :-(. Solution: rather than SIG_DFL,
- * set the signals to a null signal handler; if we exec(), they will
- * be set to SIG_DFL automatically, and before then the signals will
- * effectively be ignored.
- */
-
- void
- sig_tmp_ign(int sig)
- {
- /* do nothing, and rely on the magic of restartable system calls :-) */
- }
- #endif
-
- /*
- * 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!
- */
- sigret_t
- /*ARGSUSED*/
- pchild(snum)
- int snum;
- {
- register struct process *pp;
- register struct process *fp;
- register int pid;
- extern int insource;
- #ifdef BSDWAIT
- union wait w;
- #else /* !BSDWAIT */
- int w;
- #endif /* !BSDWAIT */
- int jobflags;
- #ifdef BSDTIMES
- struct rusage 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 */
-
- #ifdef JOBDEBUG
- xprintf("pchild()\n");
- #endif /* JOBDEBUG */
-
- /* Christos on where the signal(SIGCHLD, pchild) shoud be:
- *
- * I think that it should go *after* the wait, unlike most signal handlers.
- *
- * In release two (for which I have manuals), it says that wait will remove
- * the first child from the queue of dead children.
- * All the rest of the children that die while in the signal handler of the
- * SIGC(H)LD, will be placed in the queue. If signal is called to re-establish
- * the signal handler, and there are items in the queue, the process will
- * receive another SIGC(H)LD before signal returns. BTW this is from the
- * manual page on comp-sim... Maybe it is not applicable to the hp's, but
- * I read on the news in comp.unix.wizards or comp.unix.questions yesterday
- * that another person was claiming the the signal() call should be after
- * the wait().
- */
-
- loop:
- errno = 0; /* reset, just in case */
- #ifdef JOBDEBUG
- xprintf("Waiting...\n");
- flush();
- #endif
- #ifdef BSDJOBS
- # ifdef BSDTIMES
- /* both a wait3 and rusage */
- # ifndef BSDWAIT
- 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 */
- # 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
- /* both a wait3 and rusage */
- # ifdef hpux
- pid = wait3(&w.w_status, WNOHANG, 0);
- # else /* !hpux */
- pid = wait3(&w.w_status, WNOHANG, &ru);
- # endif /* !hpux */
- # else /* !BSDTIMES */
- # if SVID < 3
- /* no wait3, therefore no rusage */
- /* on Sys V, this may hang. I hope it's not going to be a problem */
- pid = ourwait(&w.w_status);
- # else /* SVID >= 3 */
- /*
- * 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 /* SVID >= 3 */
- # endif /* BSDTIMES */
- # ifndef BSDSIGS
- (void) sigset(SIGCHLD, pchild);
- # endif /* !BSDSIGS */
- #endif /* BSDJOBS */
-
- #ifdef JOBDEBUG
- {
- char buffer[100];
- xsprintf(buffer, "pid %d, retval %x termsig %x retcode %x\n",
- pid, w, WTERMSIG(w), WEXITSTATUS(w));
- xprintf(buffer);
- flush();
- }
- #endif /* JOBDEBUG */
-
- if (pid <= 0) {
- #ifdef JOBDEBUG
- xprintf("errno == %d\n", errno);
- #endif
- if (errno == EINTR) {
- errno = 0;
- goto loop;
- }
- pnoprocesses = pid == -1;
- #ifndef SIGVOID
- return (0);
- #else /* !SIGVOID */
- return;
- #endif /* SIGVOID */
- }
- for (pp = proclist.p_next; pp != PNULL; pp = pp->p_next)
- if (pid == pp->p_pid)
- goto found;
- #ifndef BSDJOBS
- /* this should never have happened */
- stderror(ERR_SYNC, pid);
- xexit(0);
- #else /* BSDJOBS */
- goto loop;
- #endif /* BSDJOBS */
- 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))
- #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(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 /* IIASA */
- !eq(dcwd->di_name, fp->p_cwd->di_name)) {
- ; /* print in pjwait */
- }
- /* PWP: print a newline after ^C */
- else if (jobflags & PINTERRUPTED)
- #ifdef SHORT_STRINGS
- xputchar('\r' | QUOTE), xputchar('\n');
- #else /* !SHORT_STRINGS */
- xprintf("\215\n"); /* \215 is a quoted ^M */
- #endif /* !SHORT_STRINGS */
- #ifdef notdef
- else if ((jobflags & (PTIME|PSTOPPED)) == PTIME)
- ptprint(fp);
- #endif
- }
- else {
- if (jobflags & PNOTIFY || adrof(STRnotify)) {
- #ifdef SHORT_STRINGS
- xputchar('\r' | QUOTE), xputchar('\n');
- #else /* !SHORT_STRINGS */
- xprintf("\215\n"); /* \215 is a quoted ^M */
- #endif /* !SHORT_STRINGS */
- (void) pprint(pp, NUMBER | NAME | REASON);
- if ((jobflags & PSTOPPED) == 0)
- pflush(pp);
- {
- extern Char GettingInput;
-
- if (GettingInput) {
- errno = 0;
- (void) Rawmode();
- ClearLines();
- ClearDisp();
- Refresh();
- }
- }
- }
- else {
- fp->p_flags |= PNEEDNOTE;
- neednote++;
- }
- }
- }
- #ifdef BSDJOBS
- goto loop;
- #endif /* BSDJOBS */
- }
-
- void
- pnote()
- {
- register struct process *pp;
- int flags;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
-
- neednote = 0;
- for (pp = proclist.p_next; pp != PNULL; pp = pp->p_next) {
- if (pp->p_flags & PNEEDNOTE) {
- #ifdef BSDSIGS
- omask = sigblock(sigmask(SIGCHLD));
- #else /* !BSDSIGS */
- (void) sighold(SIGCHLD);
- #endif /* !BSDSIGS */
- pp->p_flags &= ~PNEEDNOTE;
- flags = pprint(pp, NUMBER | NAME | REASON);
- if ((flags & (PRUNNING | PSTOPPED)) == 0)
- pflush(pp);
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- }
- }
- }
-
- /*
- * pwait - wait for current job to terminate, maintaining integrity
- * of current and previous job indicators.
- */
- void
- pwait()
- {
- register struct process *fp, *pp;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
-
- /*
- * Here's where dead procs get flushed.
- */
- #ifdef BSDSIGS
- omask = sigblock(sigmask(SIGCHLD));
- #else /* !BSDSIGS */
- (void) sighold(SIGCHLD);
- #endif /* !BSDSIGS */
- for (pp = (fp = &proclist)->p_next; pp != PNULL; 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;
- }
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- # ifdef notdef
- if (setintr)
- sigignore(SIGINT);
- # endif
- #endif /* !BSDSIGS */
- pjwait(pcurrjob);
- }
-
-
- /*
- * pjwait - wait for a job to finish or become stopped
- * It is assumed to be in the foreground state (PFOREGND)
- */
- void
- pjwait(pp)
- register struct process *pp;
- {
- register struct process *fp;
- int jobflags, reason;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
- #if (SVID > 0) && (SVID < 3)
- sigret_t (*inthandler)();
- #endif /* (SVID > 0) && (SVID < 3) */
-
- while (pp->p_pid != pp->p_jobid)
- pp = pp->p_friends;
- fp = pp;
-
- do {
- if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING)
- xprintf("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;
- #ifdef BSDSIGS
- omask = sigblock(sigmask(SIGCHLD));
- #endif /* BSDSIGS */
- #if (SVID > 0) && (SVID < 3)
- if (setintr)
- inthandler = signal(SIGINT, SIG_IGN);
- #endif /* (SVID > 0) && (SVID < 3) */
- for (;;) {
- #ifndef BSDSIGS
- (void) sighold(SIGCHLD);
- #endif /* !BSDSIGS */
- jobflags = 0;
- do
- jobflags |= fp->p_flags;
- while ((fp = (fp->p_friends)) != pp);
- if ((jobflags & PRUNNING) == 0)
- break;
- #ifdef JOBDEBUG
- xprintf("starting to sigpause for SIGCHLD on %d\n", fp->p_pid);
- #endif /* JOBDEBUG */
- #ifdef BSDSIGS
- /* sigpause(sigblock((sigmask_t) 0) &~ sigmask(SIGCHLD)); */
- (void) sigpause(omask & ~sigmask(SIGCHLD));
- #else /* !BSDSIGS */
- (void) sigpause(SIGCHLD);
- #endif /* !BSDSIGS */
- }
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- #if (SVID > 0) && (SVID < 3)
- if (setintr)
- (void) signal(SIGINT, inthandler);
- #endif /* (SVID > 0) && (SVID < 3) */
- #ifdef BSDJOBS
- if (tpgrp > 0) /* get tty back */
- (void) tcsetpgrp(FSHTTY, tpgrp);
- #endif /* BSDJOBS */
- if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) ||
- !eq(dcwd->di_name, fp->p_cwd->di_name)) {
- if (jobflags & PSTOPPED) {
- xprintf("\n");
- 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);
- /* NOTREACHED */
- }
- 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))) /* PWP */
- xprintf("Exit %d\n", reason);
- set(STRstatus, putn(reason));
- if (reason && exiterr)
- exitstat();
- pflush(pp);
- }
-
- /*
- * dowait - wait for all processes to finish
- */
-
- /*ARGSUSED*/
- void
- dowait(v, c)
- Char **v;
- struct command *c;
- {
- register struct process *pp;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
-
- pjobs++;
- #ifdef BSDSIGS
- omask = sigblock(sigmask(SIGCHLD));
- loop:
- #else /* !BSDSIGS */
- if (setintr)
- (void) sigrelse(SIGINT);
- loop:
- (void) sighold(SIGCHLD);
- #endif /* !BSDSIGS */
- for (pp = proclist.p_next; pp; pp = pp->p_next)
- if (pp->p_pid && /* pp->p_pid == pp->p_jobid && */
- pp->p_flags & PRUNNING) {
- #ifdef BSDSIGS
- (void) sigpause((sigmask_t) 0);
- #else /* !BSDSIGS */
- (void) sigpause(SIGCHLD);
- #endif /* !BSDSIGS */
- goto loop;
- }
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- pjobs = 0;
- }
-
- /*
- * pflushall - flush all jobs from list (e.g. at fork())
- */
- static void
- pflushall()
- {
- register struct process *pp;
-
- for (pp = proclist.p_next; pp != PNULL; 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(pp)
- register struct process *pp;
- {
- register struct process *np;
- register int idx;
-
- if (pp->p_pid == 0) {
- xprintf("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(pp)
- register struct process *pp;
- {
- if (pp == pcurrent)
- if (pprevious != PNULL) {
- 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(pid, t)
- int pid;
- register struct command *t;
- {
- register 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 |= PDIAG;
- }
- 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);
- 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 == PNULL)
- pcurrent = pp;
- else if (pprevious == PNULL)
- 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(t)
- register 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(cp)
- Char *cp;
- {
- register 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()
- {
- pholdjob = pcurrjob;
- pcurrjob = PNULL;
- }
-
- /*
- * prestjob - opposite of psavejob. This may be missed if we are interrupted
- * somewhere, but pendjob cleans up anyway.
- */
- void
- prestjob()
- {
- pcurrjob = pholdjob;
- pholdjob = PNULL;
- }
-
- /*
- * pendjob - indicate that a job (set of commands) has been completed
- * or is about to begin.
- */
- void
- pendjob()
- {
- register 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;
- xprintf("[%d]", pp->p_index);
- tp = pp;
- do {
- xprintf(" %d", pp->p_pid);
- pp = pp->p_friends;
- } while (pp != tp);
- xprintf("\n");
- }
- pholdjob = pcurrjob = 0;
- }
-
- /*
- * pprint - print a job
- */
- static int
- pprint(pp, flag)
- register struct process *pp;
- bool flag;
- {
- register status, reason;
- struct process *tp;
- extern char *linp, linbuf[];
- int jobflags, pstatus;
- char *format;
-
- 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 && linp != linbuf && !(flag & FANCY) &&
- (pstatus == status && pp->p_reason == reason ||
- !(flag & REASON)))
- xprintf(" ");
- else {
- if (tp != pp && linp != linbuf)
- xprintf("\n");
- if (flag & NUMBER)
- if (pp == tp)
- xprintf("[%d]%s %c ", pp->p_index,
- pp->p_index < 10 ? " " : "",
- pp == pcurrent ? '+' :
- (pp == pprevious ? '-' : ' '));
- else
- xprintf(" ");
- if (flag & FANCY) {
- #ifdef TCF
- extern char *sitename();
-
- #endif /* TCF */
- xprintf("%5d ", pp->p_pid);
- #ifdef TCF
- xprintf("%11s ", sitename(pp->p_pid));
- #endif /* TCF */
- }
- if (flag & (REASON | AREASON)) {
- if (flag & NAME)
- #ifdef SUSPENDED
- format = "%-23s";
- #else /* !SUSPENDED */
- format = "%-21s";
- #endif /* !SUSPENDED */
- else
- format = "%s";
- if (pstatus == status)
- if (pp->p_reason == reason) {
- xprintf(format, "");
- goto prcomd;
- }
- else
- reason = pp->p_reason;
- else {
- status = pstatus;
- reason = pp->p_reason;
- }
- switch (status) {
-
- case PRUNNING:
- xprintf(format, "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)))
- xprintf(format, mesg[pp->p_reason & ASCII].pname);
- else
- reason = -1;
- break;
-
- case PNEXITED:
- case PAEXITED:
- if (flag & REASON)
- if (pp->p_reason)
- #ifdef SUSPENDED
- xprintf("Exit %-18d", pp->p_reason);
- #else /* SUSPENDED */
- xprintf("Exit %-16d", pp->p_reason);
- #endif /* SUSPENDED */
- else
- xprintf(format, "Done");
- break;
-
- default:
- xprintf("BUG: status=%-9o", status);
- }
- }
- }
- prcomd:
- if (flag & NAME) {
- xprintf("%s", short2str(pp->p_command));
- if (pp->p_flags & PPOU)
- xprintf(" |");
- if (pp->p_flags & PDIAG)
- xprintf("&");
- }
- if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED)
- xprintf(" (core dumped)");
- if (tp == pp->p_friends) {
- if (flag & AMPERSAND)
- xprintf(" &");
- if (flag & JOBDIR &&
- !eq(tp->p_cwd->di_name, dcwd->di_name)) {
- xprintf(" (wd: ");
- dtildepr(value(STRhome), 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 */
-
- }
- if (tp == pp->p_friends) {
- if (linp != linbuf)
- xprintf("\n");
- if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) {
- xprintf("(wd now: ");
- dtildepr(value(STRhome), dcwd->di_name);
- xprintf(")\n");
- }
- }
- } while ((pp = pp->p_friends) != tp);
- if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) {
- if (jobflags & NUMBER)
- xprintf(" ");
- ptprint(tp);
- }
- return (jobflags);
- }
-
- static void
- ptprint(tp)
- register struct process *tp;
- {
- #ifdef BSDTIMES
- struct timeval tetime, diff;
- static struct timeval ztime;
- struct rusage ru;
- static struct rusage zru;
- register 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_
- # define timercmp(tvp, uvp, cmp) \
- ((tvp)->tv_sec cmp (uvp)->tv_sec || \
- (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
- timeval_t tetime, diff;
- static timeval_t ztime;
- struct process_stats ru;
- static struct process_stats zru;
- register 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;
- register 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(v, c)
- Char **v;
- struct command *c;
- {
- register struct process *pp;
- register int flag = NUMBER | NAME | REASON;
- int i;
-
- 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
- */
- /*ARGSUSED*/
- void
- dofg(v, c)
- Char **v;
- struct command *c;
- {
- register struct process *pp;
-
- okpcntl();
- ++v;
- do {
- pp = pfind(*v);
- pstart(pp, 1);
- #ifndef BSDSIGS
- # ifdef notdef
- if (setintr)
- sigignore(SIGINT);
- # endif
- #endif /* !BSDSIGS */
- pjwait(pp);
- } while (*v && *++v);
- }
-
- /*
- * %... - builtin - put the job into the foreground
- */
- /*ARGSUSED*/
- void
- dofg1(v, c)
- Char **v;
- struct command *c;
- {
- register struct process *pp;
-
- okpcntl();
- pp = pfind(v[0]);
- pstart(pp, 1);
- #ifndef BSDSIGS
- # ifdef notdef
- if (setintr)
- sigignore(SIGINT);
- # endif
- #endif /* !BSDSIGS */
- pjwait(pp);
- }
-
- /*
- * dobg - builtin - put the job into the background
- */
- /*ARGSUSED*/
- void
- dobg(v, c)
- Char **v;
- struct command *c;
- {
- register struct process *pp;
-
- okpcntl();
- ++v;
- do {
- pp = pfind(*v);
- pstart(pp, 0);
- } while (*v && *++v);
- }
-
- /*
- * %... & - builtin - put the job into the background
- */
- /*ARGSUSED*/
- void
- dobg1(v, c)
- Char **v;
- struct command *c;
- {
- register struct process *pp;
-
- pp = pfind(v[0]);
- pstart(pp, 0);
- }
-
- /*
- * dostop - builtin - stop the job
- */
- /*ARGSUSED*/
- void
- dostop(v, c)
- Char **v;
- struct command *c;
- {
- #ifdef BSDJOBS
- pkill(++v, SIGSTOP);
- #endif /* BSDJOBS */
- }
-
- /*
- * dokill - builtin - superset of kill (1)
- */
- /*ARGSUSED*/
- void
- dokill(v, c)
- Char **v;
- struct command *c;
- {
- register int signum, len = 0;
- register char *name;
- extern int T_Cols;
-
- v++;
- if (v[0] && v[0][0] == '-') {
- if (v[0][1] == 'l') {
- for (signum = 1; signum <= NSIG; signum++) {
- if ((name = mesg[signum].iname) != NULL) {
- len += strlen(name) + 1;
- if (len >= T_Cols - 1) {
- xprintf("\n");
- len = strlen(name) + 1;
- }
- xprintf("%s ", name);
- }
- }
- xprintf("\n");
- return;
- }
- if (Isdigit(v[0][1])) {
- signum = atoi(short2str(v[0] + 1));
- if (signum < 0 || signum > NSIG)
- stderror(ERR_NAME | ERR_BADSIG);
- }
- else {
- for (signum = 1; signum <= NSIG; signum++)
- if (mesg[signum].iname &&
- eq(&v[0][1], str2short(mesg[signum].iname)))
- goto gotsig;
- setname(short2str(&v[0][1]));
- stderror(ERR_NAME | ERR_UNKSIG);
- }
- gotsig:
- v++;
- }
- else
- signum = SIGTERM;
- pkill(v, signum);
- }
-
- static void
- pkill(v, signum)
- Char **v;
- int signum;
- {
- register struct process *pp, *np;
- int jobflags = 0, err1 = 0;
- pid_t pid;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
- Char *cp;
-
- #ifdef BSDSIGS
- omask = sigmask(SIGCHLD);
- if (setintr)
- omask |= sigmask(SIGINT);
- omask = sigblock(omask) & ~omask;
- #else /* !BSDSIGS */
- if (setintr)
- (void) sighold(SIGINT);
- (void) sighold(SIGCHLD);
- #endif /* !BSDSIGS */
- 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);
- #ifdef BSDJOBS
- switch (signum) {
-
- case SIGSTOP:
- case SIGTSTP:
- case SIGTTIN:
- case SIGTTOU:
- if ((jobflags & PRUNNING) == 0) {
- # ifdef SUSPENDED
- xprintf("%s: Already suspended\n",
- short2str(cp));
- # else /* !SUSPENDED */
- xprintf("%s: Already stopped\n",
- short2str(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:
- pstart(pp, 0);
- goto cont;
- }
- #endif /* BSDJOBS */
- if (killpg(pp->p_jobid, signum) < 0) {
- xprintf("%s: %s\n", short2str(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 {
- pid = atoi(short2str(cp));
- 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++;
- }
- if (gargv)
- blkfree(gargv), gargv = 0;
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- if (setintr)
- (void) sigrelse(SIGINT);
- #endif /* !BSDSIGS */
- if (err1)
- stderror(ERR_SILENT);
- }
-
- /*
- * pstart - start the job in foreground/background
- */
- void
- pstart(pp, foregnd)
- register struct process *pp;
- int foregnd;
- {
- register struct process *np;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
- long jobflags = 0;
-
- #ifdef BSDSIGS
- omask = sigblock(sigmask(SIGCHLD));
- #else /* !BSDSIGS */
- (void) sighold(SIGCHLD);
- #endif
- 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);
- #ifdef BSDJOBS
- if (foregnd)
- (void) tcsetpgrp(FSHTTY, pp->p_jobid);
- if (jobflags & PSTOPPED)
- (void) killpg(pp->p_jobid, SIGCONT);
- #endif /* BSDJOBS */
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- }
-
- void
- panystop(neednl)
- bool neednl;
- {
- register 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(cp)
- Char *cp;
- {
- register struct process *pp, *np;
-
- if (cp == 0 || cp[1] == 0 || eq(cp, STRcent2) || eq(cp, STRcentplus)) {
- if (pcurrent == PNULL)
- stderror(ERR_NAME | ERR_JOBCUR);
- return (pcurrent);
- }
- if (eq(cp, STRcentminus) || eq(cp, STRcenthash)) {
- if (pprevious == PNULL)
- 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 = PNULL;
- for (pp = proclist.p_next; pp; pp = pp->p_next)
- if (pp->p_pid == pp->p_jobid) {
- if (cp[1] == '?') {
- register 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(pp)
- register struct process *pp;
- {
- register struct process *np;
- register struct process *xp = PNULL;
-
- 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 == PNULL)
- xp = np;
- }
- return (xp);
- }
-
- /*
- * donotify - flag the job so as to report termination asynchronously
- */
- /*ARGSUSED*/
- void
- donotify(v, c)
- Char **v;
- struct command *c;
- {
- register 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(t, wanttty)
- struct command *t; /* command we are forking for */
- int wanttty;
- {
- register int pid;
- bool ignint = 0;
- int pgrp;
- #ifdef BSDSIGS
- sigmask_t omask;
- #endif /* BSDSIGS */
- #if SIGSYNCH
- sigvec_t osv;
- static sigvec_t nsv = {synch_handler, ~0, 0};
- #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);
- /*
- * Hold SIGCHLD until we have the process installed in our table.
- */
- #ifdef SIGSYNCH
- if (mysigvec(SIGSYNCH, &nsv, &osv))
- stderror(ERR_SYSTEM, "pfork: sigvec set", strerror(errno));
- #endif /* SIGSYNCH */
- #ifdef BSDSIGS
- omask = sigblock(sigmask(SIGCHLD));
- #else /* !BSDSIGS */
- (void) sighold(SIGCHLD);
- #endif /* !BSDSIGS */
- while ((pid = fork()) < 0)
- if (setintr == 0)
- (void) sleep(FORKSLEEP);
- else {
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGINT);
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- stderror(ERR_NOPROC);
- }
- if (pid == 0) {
- settimes();
- pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
- pflushall();
- pcurrjob = PNULL;
- #if !defined(BSDTIMES) && !defined(_SEQUENT_)
- timesdone = 0;
- #endif /* !defined(BSDTIMES) && !defined(_SEQUENT_) */
- child++;
- if (setintr) {
- setintr = 0; /* until I think otherwise */
- #ifndef BSDSIGS
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- /*
- * 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 */
- # ifdef __MINT__
- /* see comments for sig_tmp_ign above */
- (void) signal(SIGTSTP, sig_tmp_ign);
- (void) signal(SIGTTIN, sig_tmp_ign);
- (void) signal(SIGTTOU, sig_tmp_ign);
- # else
- (void) signal(SIGTSTP, SIG_DFL);
- (void) signal(SIGTTIN, SIG_DFL);
- (void) signal(SIGTTOU, SIG_DFL);
- # endif
- }
- #endif /* BSDJOBS */
- (void) signal(SIGTERM, parterm);
- }
- else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) {
- (void) signal(SIGINT, SIG_IGN);
- (void) signal(SIGQUIT, SIG_IGN);
- }
- #ifdef OREO
- sigignore(SIGIO); /* 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)
- #ifdef BSDNICE
- (void) setpriority(PRIO_PROCESS, 0, t->t_nice);
- #else /* !BSDNICE */
- (void) nice(t->t_nice);
- #endif /* !BSDNICE */
- #ifdef F_VER
- if (t->t_dflg & F_VER) {
- Setenv(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)
- (void) setpgid(pid, pcurrjob ? pcurrjob->p_jobid : pid);
- #endif /* POSIXJOBS */
- palloc(pid, t);
- #ifdef SIGSYNCH
- /*
- * 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.
- */
- sigpause(omask & ~SYNCHMASK);
- if (mysigvec(SIGSYNCH, &osv, NULL))
- stderror(ERR_SYSTEM, "pfork parent: sigvec restore",
- strerror(errno));
- #endif /* SIGSYNCH */
-
- #ifdef BSDSIGS
- (void) sigsetmask(omask);
- #else /* !BSDSIGS */
- (void) sigrelse(SIGCHLD);
- #endif /* !BSDSIGS */
- }
- return (pid);
- }
-
- static void
- okpcntl()
- {
- if (tpgrp == -1)
- stderror(ERR_JOBCONTROL);
- if (tpgrp == 0)
- stderror(ERR_JOBCTRLSUB);
- }
-
- /*
- * 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(wanttty, pgrp)
- int wanttty, pgrp;
- {
- #ifdef BSDJOBS
- # if defined(BSDSIGS) && defined(POSIXJOBS)
- sigmask_t omask = 0;
- # endif /* BSDSIGS && POSIXJOBS */
-
- # ifdef JOBDEBUG
- xprintf("wanttty %d\n", wanttty);
- # endif
-
- # ifdef POSIXJOBS
- /*
- * christos: I am blocking the tty signals till I've set things
- * correctly....
- */
- if (wanttty > 0)
- # ifdef BSDSIGS
- omask = sigblock(sigmask(SIGTSTP)|sigmask(SIGTTIN)|sigmask(SIGTTOU));
- # else /* !BSDSIGS */
- {
- (void) sighold(SIGTSTP);
- (void) sighold(SIGTTIN);
- (void) sighold(SIGTTOU);
- }
- # endif /* !BSDSIGS */
-
- /*
- * 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) {
- # if !defined(ISC) && !defined(SCO)
- /* XXX: Wrong but why? */
- xprintf("tcsh: setpgid error (%s).\n", strerror(errno));
- xexit(0);
- # endif /* !ISC && !SCO */
- }
- # endif /* POSIXJOBS */
-
- if (wanttty > 0)
- (void) tcsetpgrp(FSHTTY, pgrp);
-
- # ifndef POSIXJOBS
- if (wanttty >= 0)
- if (setpgid(0, pgrp) == -1) {
- # if !defined(ISC) && !defined(SCO)
- /* XXX: Wrong but why? */
- xprintf("tcsh: setpgid error (%s).\n", strerror(errno));
- xexit(0);
- # endif /* !ISC && !SCO */
- }
- # else /* POSIXJOBS */
- if (wanttty > 0)
- # ifdef BSDSIGS
- (void) sigsetmask(omask);
- # else /* BSDSIGS */
- {
- (void) sigrelse(SIGTSTP);
- (void) sigrelse(SIGTTIN);
- (void) sigrelse(SIGTTOU);
- }
- # endif /* !BSDSIGS */
- # endif /* POSIXJOBS */
-
- if (tpgrp > 0)
- tpgrp = 0; /* gave tty away */
- #endif /* BSDJOBS */
- }
-