2.11BSD/src/bin/tcsh/sh.proc.c
/* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/sh.proc.c,v 3.1 1991/07/05 02:00:43 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"
#if !defined(lint) && !defined(pdp11)
static char *rcsid()
{ return "$Id: sh.proc.c,v 3.1 1991/07/05 02:00:43 christos Exp $"; }
#endif
#include "sh.h"
#include "ed.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
#ifndef WTERMSIG
# define WTERMSIG(w) (((union wait *) &(w))->w_termsig)
# define 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 */
#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 */
# ifdef masscomp
/*
* 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.
*/
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 pro_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 **v, int));
static struct process *pgetcurr __P((struct process *));
static void okpcntl __P((void));
/*
* pchild - called at interrupt level by the SIGCHLD signal
* indicating that at least one child has terminated or stopped
* thus at least one wait system call will definitely return a
* childs status. Top level routines (like pwait) must be sure
* to mask interrupts when playing with the proclist data structures!
*/
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 pro_stats ru;
struct pro_stats cpst1, cpst2;
tmval_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_pro_stats(&tv, PS_SELF, 0, &cpst1);
pid = waitpid(-1, &w,
(setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG));
(void) get_pro_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 */
#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_pro_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 */
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 */
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 */
#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(STRl_jobs)) {
Char *jobcommand[3];
jobcommand[0] = STRjobs;
if (eq(value(STRl_jobs), STRlong))
jobcommand[1] = STRml;
else
jobcommand[1] = NULL;
jobcommand[2] = NULL;
dojobs(jobcommand);
(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);
/* cwd_cmd(); *//* (PWP) this is what pre_cmd is for! */
}
/*
* dowait - wait for all processes to finish
*/
void
dowait()
{
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_pro_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(STRL_parensp);
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(STRsP2sp);
break;
case NODE_AND:
pads(STRspand2sp);
break;
case NODE_PIPE:
pads(STRsPsp);
break;
case NODE_LIST:
pads(STRsmsp);
break;
}
padd(t->t_dcdr);
return;
}
if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) {
pads((t->t_dflg & F_READ) ? STRspL_arrow2sp : STRspLarrowsp);
pads(t->t_dlef);
}
if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) {
pads((t->t_dflg & F_APPEND) ? STRspR_arrow2 : 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].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)
tmval_t tetime, diff;
static tmval_t ztime;
struct pro_stats ru;
static struct pro_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
*/
void
dojobs(v)
Char **v;
{
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
*/
void
dofg(v)
Char **v;
{
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
*/
void
dofg1(v)
Char **v;
{
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
*/
void
dobg(v)
Char **v;
{
register struct process *pp;
okpcntl();
++v;
do {
pp = pfind(*v);
pstart(pp, 0);
} while (*v && *++v);
}
/*
* %... & - builtin - put the job into the background
*/
void
dobg1(v)
Char **v;
{
register struct process *pp;
pp = pfind(v[0]);
pstart(pp, 0);
}
/*
* dostop - builtin - stop the job
*/
void
dostop(v)
Char **v;
{
#ifdef BSDJOBS
pkill(++v, SIGSTOP);
#endif /* BSDJOBS */
}
/*
* dokill - builtin - superset of kill (1)
*/
void
dokill(v)
Char **v;
{
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;
register int jobflags = 0;
int pid, err1 = 0;
#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((pid_t) pp->p_jobid, signum) < 0) {
xprintf("%s: %s\n", short2str(cp), strerror(errno));
err1++;
}
#ifdef BSDJOBS
if (signum == SIGTERM || signum == SIGHUP)
(void) killpg((pid_t) pp->p_jobid, SIGCONT);
#endif /* BSDJOBS */
}
else if (!(Isdigit(*cp) || *cp == '-'))
stderror(ERR_NAME | ERR_JOBARGS);
else {
pid = atoi(short2str(cp));
if (kill((pid_t) pid, signum) < 0) {
xprintf("%d: %s\n", pid, strerror(errno));
err1++;
goto cont;
}
#ifdef BSDJOBS
if (signum == SIGTERM || signum == SIGHUP)
(void) kill((pid_t) 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((pid_t) 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, STRc_2) || eq(cp, STRc_plus)) {
if (pcurrent == PNULL)
stderror(ERR_NAME | ERR_JOBCUR);
return (pcurrent);
}
if (eq(cp, STRc_minus) || eq(cp, STRc_hash)) {
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
*/
void
donotify(v)
Char **v;
{
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 */
(void) signal(SIGTSTP, SIG_DFL);
(void) signal(SIGTTIN, SIG_DFL);
(void) signal(SIGTTOU, SIG_DFL);
}
#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();
}
#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) {
xprintf("tcsh: setpgid error.\n");
xexit(0);
}
# endif /* POSIXJOBS */
if (wanttty > 0)
(void) tcsetpgrp(FSHTTY, pgrp);
# ifndef POSIXJOBS
if (wanttty >= 0)
if (setpgid(0, pgrp) == -1) {
xprintf("tcsh: setpgid error.\n");
xexit(0);
}
# 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 */
}