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freebsd-skq/contrib/tcsh/sh.proc.c
mp 7932b13626 Import two vendor fixes from tcsh-6.15.01 for MFC to 7.0. The fixes are: 
- Fix pty detection for autologout setting
  - kill `foo` got stuck because sigchld was disabled too soon

Requested by: re
2007-10-15 15:23:07 +00:00

1991 lines
48 KiB
C
Raw Blame History

/* $Header: /p/tcsh/cvsroot/tcsh/sh.proc.c,v 3.104 2006/09/27 16:59:04 mitr 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 3.104 2006/09/27 16:59:04 mitr 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__)
# define BSDWAIT
#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 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 */
pid = wait3(&w.w_status, WNOHANG, &ru);
# 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)) {
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 */
!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(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 (;;) {
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)) ||
!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 {
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(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;
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) {
handle_pending_signals();
sigsuspend(&pause_mask);
handle_pending_signals();
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(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 command[PMAXLEN + 4];
static size_t cmdlen;
static Char *cmdp;
/* GrP
* unparse - Export padd() functionality
*/
Char *
unparse(struct command *t)
{
cmdp = command;
cmdlen = 0;
padd(t);
*cmdp++ = '\0';
return Strsave(command);
}
/*
* 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_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;
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_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;
/*
* Avoid the Quoted Space alias hack! Reported by:
* sam@john-bigboote.ICS.UCI.EDU (Sam Horrocks)
*/
if (cp[0] == STRQNULL[0])
cp++;
i = Strlen(cp);
if (cmdlen >= PMAXLEN)
return;
if (cmdlen + i >= PMAXLEN) {
(void) Strcpy(cmdp, STRsp3dots);
cmdlen = PMAXLEN;
cmdp += 4;
return;
}
(void) Strcpy(cmdp, cp);
cmdp += i;
cmdlen += i;
}
/*
* psavejob - temporarily save the current job on a one level stack
* so another job can be created. Used for { } in exp6
* and `` in globbing.
*/
void
psavejob(void)
{
pholdjob = pcurrjob;
pcurrjob = NULL;
}
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;
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(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(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(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);
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 */
}
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