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jobs.c
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/* $OpenBSD: jobs.c,v 1.43 2015/09/10 22:48:58 nicm Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011,
* 2012, 2013, 2014, 2015, 2016, 2018
* mirabilos <[email protected]>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/jobs.c,v 1.127 2018/07/15 16:23:10 tg Exp $");
#if HAVE_KILLPG
#define mksh_killpg killpg
#else
/* cross fingers and hope kill is killpg-endowed */
#define mksh_killpg(p,s) kill(-(p), (s))
#endif
/* Order important! */
#define PRUNNING 0
#define PEXITED 1
#define PSIGNALLED 2
#define PSTOPPED 3
typedef struct proc Proc;
/* to take alignment into consideration */
struct proc_dummy {
Proc *next;
pid_t pid;
int state;
int status;
char command[128];
};
/* real structure */
struct proc {
/* next process in pipeline (if any) */
Proc *next;
/* process id of this Unix process in the job */
pid_t pid;
/* one of the four P… above */
int state;
/* wait status */
int status;
/* process command string from vistree */
char command[256 - (ALLOC_OVERHEAD +
offsetof(struct proc_dummy, command[0]))];
};
/* Notify/print flag - j_print() argument */
#define JP_SHORT 1 /* print signals processes were killed by */
#define JP_MEDIUM 2 /* print [job-num] -/+ command */
#define JP_LONG 3 /* print [job-num] -/+ pid command */
#define JP_PGRP 4 /* print pgrp */
/* put_job() flags */
#define PJ_ON_FRONT 0 /* at very front */
#define PJ_PAST_STOPPED 1 /* just past any stopped jobs */
/* Job.flags values */
#define JF_STARTED 0x001 /* set when all processes in job are started */
#define JF_WAITING 0x002 /* set if j_waitj() is waiting on job */
#define JF_W_ASYNCNOTIFY 0x004 /* set if waiting and async notification ok */
#define JF_XXCOM 0x008 /* set for $(command) jobs */
#define JF_FG 0x010 /* running in foreground (also has tty pgrp) */
#define JF_SAVEDTTY 0x020 /* j->ttystat is valid */
#define JF_CHANGED 0x040 /* process has changed state */
#define JF_KNOWN 0x080 /* $! referenced */
#define JF_ZOMBIE 0x100 /* known, unwaited process */
#define JF_REMOVE 0x200 /* flagged for removal (j_jobs()/j_noityf()) */
#define JF_USETTYMODE 0x400 /* tty mode saved if process exits normally */
#define JF_SAVEDTTYPGRP 0x800 /* j->saved_ttypgrp is valid */
typedef struct job Job;
struct job {
Job *next; /* next job in list */
Proc *proc_list; /* process list */
Proc *last_proc; /* last process in list */
struct timeval systime; /* system time used by job */
struct timeval usrtime; /* user time used by job */
pid_t pgrp; /* process group of job */
pid_t ppid; /* pid of process that forked job */
int job; /* job number: %n */
int flags; /* see JF_* */
volatile int state; /* job state */
int status; /* exit status of last process */
int age; /* number of jobs started */
Coproc_id coproc_id; /* 0 or id of coprocess output pipe */
#ifndef MKSH_UNEMPLOYED
mksh_ttyst ttystat; /* saved tty state for stopped jobs */
pid_t saved_ttypgrp; /* saved tty process group for stopped jobs */
#endif
};
/* Flags for j_waitj() */
#define JW_NONE 0x00
#define JW_INTERRUPT 0x01 /* ^C will stop the wait */
#define JW_ASYNCNOTIFY 0x02 /* asynchronous notification during wait ok */
#define JW_STOPPEDWAIT 0x04 /* wait even if job stopped */
#define JW_PIPEST 0x08 /* want PIPESTATUS */
/* Error codes for j_lookup() */
#define JL_NOSUCH 0 /* no such job */
#define JL_AMBIG 1 /* %foo or %?foo is ambiguous */
#define JL_INVALID 2 /* non-pid, non-% job id */
static const char * const lookup_msgs[] = {
"no such job",
"ambiguous",
"argument must be %job or process id"
};
static Job *job_list; /* job list */
static Job *last_job;
static Job *async_job;
static pid_t async_pid;
static int nzombie; /* # of zombies owned by this process */
static int njobs; /* # of jobs started */
#ifndef CHILD_MAX
#define CHILD_MAX 25
#endif
#ifndef MKSH_NOPROSPECTOFWORK
/* held_sigchld is set if sigchld occurs before a job is completely started */
static volatile sig_atomic_t held_sigchld;
#endif
#ifndef MKSH_UNEMPLOYED
static struct shf *shl_j;
static bool ttypgrp_ok; /* set if can use tty pgrps */
static pid_t restore_ttypgrp = -1;
static int const tt_sigs[] = { SIGTSTP, SIGTTIN, SIGTTOU };
#endif
static void j_set_async(Job *);
static void j_startjob(Job *);
static int j_waitj(Job *, int, const char *);
static void j_sigchld(int);
static void j_print(Job *, int, struct shf *);
static Job *j_lookup(const char *, int *);
static Job *new_job(void);
static Proc *new_proc(void);
static void check_job(Job *);
static void put_job(Job *, int);
static void remove_job(Job *, const char *);
static int kill_job(Job *, int);
static void tty_init_talking(void);
static void tty_init_state(void);
/* initialise job control */
void
j_init(void)
{
#ifndef MKSH_NOPROSPECTOFWORK
(void)sigemptyset(&sm_default);
sigprocmask(SIG_SETMASK, &sm_default, NULL);
(void)sigemptyset(&sm_sigchld);
(void)sigaddset(&sm_sigchld, SIGCHLD);
setsig(&sigtraps[SIGCHLD], j_sigchld,
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
#else
/* Make sure SIGCHLD isn't ignored - can do odd things under SYSV */
setsig(&sigtraps[SIGCHLD], SIG_DFL, SS_RESTORE_ORIG|SS_FORCE);
#endif
#ifndef MKSH_UNEMPLOYED
if (Flag(FMONITOR) == 127)
Flag(FMONITOR) = Flag(FTALKING);
/*
* shl_j is used to do asynchronous notification (used in
* an interrupt handler, so need a distinct shf)
*/
shl_j = shf_fdopen(2, SHF_WR, NULL);
if (Flag(FMONITOR) || Flag(FTALKING)) {
int i;
/*
* the TF_SHELL_USES test is a kludge that lets us know if
* if the signals have been changed by the shell.
*/
for (i = NELEM(tt_sigs); --i >= 0; ) {
sigtraps[tt_sigs[i]].flags |= TF_SHELL_USES;
/* j_change() sets this to SS_RESTORE_DFL if FMONITOR */
setsig(&sigtraps[tt_sigs[i]], SIG_IGN,
SS_RESTORE_IGN|SS_FORCE);
}
}
/* j_change() calls tty_init_talking() and tty_init_state() */
if (Flag(FMONITOR))
j_change();
else
#endif
if (Flag(FTALKING)) {
tty_init_talking();
tty_init_state();
}
}
static int
proc_errorlevel(Proc *p)
{
switch (p->state) {
case PEXITED:
return ((WEXITSTATUS(p->status)) & 255);
case PSIGNALLED:
return (ksh_sigmask(WTERMSIG(p->status)));
default:
return (0);
}
}
#if !defined(MKSH_UNEMPLOYED) && HAVE_GETSID
/* suspend the shell */
void
j_suspend(void)
{
struct sigaction sa, osa;
/* Restore tty and pgrp. */
if (ttypgrp_ok) {
if (tty_hasstate)
mksh_tcset(tty_fd, &tty_state);
if (restore_ttypgrp >= 0) {
if (tcsetpgrp(tty_fd, restore_ttypgrp) < 0) {
warningf(false, Tf_ssfaileds,
Tj_suspend, "tcsetpgrp", cstrerror(errno));
} else if (setpgid(0, restore_ttypgrp) < 0) {
warningf(false, Tf_ssfaileds,
Tj_suspend, "setpgid", cstrerror(errno));
}
}
}
/* Suspend the shell. */
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_DFL;
sigaction(SIGTSTP, &sa, &osa);
kill(0, SIGTSTP);
/* Back from suspend, reset signals, pgrp and tty. */
sigaction(SIGTSTP, &osa, NULL);
if (ttypgrp_ok) {
if (restore_ttypgrp >= 0) {
if (setpgid(0, kshpid) < 0) {
warningf(false, Tf_ssfaileds,
Tj_suspend, "setpgid", cstrerror(errno));
ttypgrp_ok = false;
} else if (tcsetpgrp(tty_fd, kshpid) < 0) {
warningf(false, Tf_ssfaileds,
Tj_suspend, "tcsetpgrp", cstrerror(errno));
ttypgrp_ok = false;
}
}
tty_init_state();
}
}
#endif
/* job cleanup before shell exit */
void
j_exit(void)
{
/* kill stopped, and possibly running, jobs */
Job *j;
bool killed = false;
for (j = job_list; j != NULL; j = j->next) {
if (j->ppid == procpid &&
(j->state == PSTOPPED ||
(j->state == PRUNNING &&
((j->flags & JF_FG) ||
(Flag(FLOGIN) && !Flag(FNOHUP) && procpid == kshpid))))) {
killed = true;
if (j->pgrp == 0)
kill_job(j, SIGHUP);
else
mksh_killpg(j->pgrp, SIGHUP);
#ifndef MKSH_UNEMPLOYED
if (j->state == PSTOPPED) {
if (j->pgrp == 0)
kill_job(j, SIGCONT);
else
mksh_killpg(j->pgrp, SIGCONT);
}
#endif
}
}
if (killed)
sleep(1);
j_notify();
#ifndef MKSH_UNEMPLOYED
if (kshpid == procpid && restore_ttypgrp >= 0) {
/*
* Need to restore the tty pgrp to what it was when the
* shell started up, so that the process that started us
* will be able to access the tty when we are done.
* Also need to restore our process group in case we are
* about to do an exec so that both our parent and the
* process we are to become will be able to access the tty.
*/
tcsetpgrp(tty_fd, restore_ttypgrp);
setpgid(0, restore_ttypgrp);
}
if (Flag(FMONITOR)) {
Flag(FMONITOR) = 0;
j_change();
}
#endif
}
#ifndef MKSH_UNEMPLOYED
/* turn job control on or off according to Flag(FMONITOR) */
void
j_change(void)
{
int i;
if (Flag(FMONITOR)) {
bool use_tty = Flag(FTALKING);
/* don't call mksh_tcget until we own the tty process group */
if (use_tty)
tty_init_talking();
/* no controlling tty, no SIGT* */
if ((ttypgrp_ok = (use_tty && tty_fd >= 0 && tty_devtty))) {
setsig(&sigtraps[SIGTTIN], SIG_DFL,
SS_RESTORE_ORIG|SS_FORCE);
/* wait to be given tty (POSIX.1, B.2, job control) */
while (/* CONSTCOND */ 1) {
pid_t ttypgrp;
if ((ttypgrp = tcgetpgrp(tty_fd)) < 0) {
warningf(false, Tf_ssfaileds,
"j_init", "tcgetpgrp",
cstrerror(errno));
ttypgrp_ok = false;
break;
}
if (ttypgrp == kshpgrp)
break;
kill(0, SIGTTIN);
}
}
for (i = NELEM(tt_sigs); --i >= 0; )
setsig(&sigtraps[tt_sigs[i]], SIG_IGN,
SS_RESTORE_DFL|SS_FORCE);
if (ttypgrp_ok && kshpgrp != kshpid) {
if (setpgid(0, kshpid) < 0) {
warningf(false, Tf_ssfaileds,
"j_init", "setpgid", cstrerror(errno));
ttypgrp_ok = false;
} else {
if (tcsetpgrp(tty_fd, kshpid) < 0) {
warningf(false, Tf_ssfaileds,
"j_init", "tcsetpgrp",
cstrerror(errno));
ttypgrp_ok = false;
} else
restore_ttypgrp = kshpgrp;
kshpgrp = kshpid;
}
}
#ifndef MKSH_DISABLE_TTY_WARNING
if (use_tty && !ttypgrp_ok)
warningf(false, Tf_sD_s, "warning",
"won't have full job control");
#endif
} else {
ttypgrp_ok = false;
if (Flag(FTALKING))
for (i = NELEM(tt_sigs); --i >= 0; )
setsig(&sigtraps[tt_sigs[i]], SIG_IGN,
SS_RESTORE_IGN|SS_FORCE);
else
for (i = NELEM(tt_sigs); --i >= 0; ) {
if (sigtraps[tt_sigs[i]].flags &
(TF_ORIG_IGN | TF_ORIG_DFL))
setsig(&sigtraps[tt_sigs[i]],
(sigtraps[tt_sigs[i]].flags & TF_ORIG_IGN) ?
SIG_IGN : SIG_DFL,
SS_RESTORE_ORIG|SS_FORCE);
}
}
tty_init_state();
}
#endif
#if HAVE_NICE
/* run nice(3) and ignore the result */
static void
ksh_nice(int ness)
{
#if defined(__USE_FORTIFY_LEVEL) && (__USE_FORTIFY_LEVEL > 0)
int eno;
errno = 0;
/* this is gonna annoy users; complain to your distro, people! */
if (nice(ness) == -1 && (eno = errno) != 0)
warningf(false, Tf_sD_s, "bgnice", cstrerror(eno));
#else
(void)nice(ness);
#endif
}
#endif
/* execute tree in child subprocess */
int
exchild(struct op *t, int flags,
volatile int *xerrok,
/* used if XPCLOSE or XCCLOSE */
int close_fd)
{
/* for pipelines */
static Proc *last_proc;
int rv = 0, forksleep, jwflags = JW_NONE;
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
#endif
Proc *p;
Job *j;
pid_t cldpid;
if (flags & XPIPEST) {
flags &= ~XPIPEST;
jwflags |= JW_PIPEST;
}
if (flags & XEXEC)
/*
* Clear XFORK|XPCLOSE|XCCLOSE|XCOPROC|XPIPEO|XPIPEI|XXCOM|XBGND
* (also done in another execute() below)
*/
return (execute(t, flags & (XEXEC | XERROK), xerrok));
#ifndef MKSH_NOPROSPECTOFWORK
/* no SIGCHLDs while messing with job and process lists */
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
#endif
p = new_proc();
p->next = NULL;
p->state = PRUNNING;
p->status = 0;
p->pid = 0;
/* link process into jobs list */
if (flags & XPIPEI) {
/* continuing with a pipe */
if (!last_job)
internal_errorf("exchild: XPIPEI and no last_job - pid %d",
(int)procpid);
j = last_job;
if (last_proc)
last_proc->next = p;
last_proc = p;
} else {
/* fills in j->job */
j = new_job();
/*
* we don't consider XXCOMs foreground since they don't get
* tty process group and we don't save or restore tty modes.
*/
j->flags = (flags & XXCOM) ? JF_XXCOM :
((flags & XBGND) ? 0 : (JF_FG|JF_USETTYMODE));
timerclear(&j->usrtime);
timerclear(&j->systime);
j->state = PRUNNING;
j->pgrp = 0;
j->ppid = procpid;
j->age = ++njobs;
j->proc_list = p;
j->coproc_id = 0;
last_job = j;
last_proc = p;
put_job(j, PJ_PAST_STOPPED);
}
vistree(p->command, sizeof(p->command), t);
/* create child process */
forksleep = 1;
while ((cldpid = fork()) < 0 && errno == EAGAIN && forksleep < 32) {
if (intrsig)
/* allow user to ^C out... */
break;
sleep(forksleep);
forksleep <<= 1;
}
/* ensure $RANDOM changes between parent and child */
rndset((unsigned long)cldpid);
/* fork failed? */
if (cldpid < 0) {
kill_job(j, SIGKILL);
remove_job(j, "fork failed");
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
errorf("can't fork - try again");
}
p->pid = cldpid ? cldpid : (procpid = getpid());
#ifndef MKSH_UNEMPLOYED
/* job control set up */
if (Flag(FMONITOR) && !(flags&XXCOM)) {
bool dotty = false;
if (j->pgrp == 0) {
/* First process */
j->pgrp = p->pid;
dotty = true;
}
/*
* set pgrp in both parent and child to deal with race
* condition
*/
setpgid(p->pid, j->pgrp);
if (ttypgrp_ok && dotty && !(flags & XBGND))
tcsetpgrp(tty_fd, j->pgrp);
}
#endif
/* used to close pipe input fd */
if (close_fd >= 0 && (((flags & XPCLOSE) && cldpid) ||
((flags & XCCLOSE) && !cldpid)))
close(close_fd);
if (!cldpid) {
/* child */
/* Do this before restoring signal */
if (flags & XCOPROC)
coproc_cleanup(false);
cleanup_parents_env();
#ifndef MKSH_UNEMPLOYED
/*
* If FMONITOR or FTALKING is set, these signals are ignored,
* if neither FMONITOR nor FTALKING are set, the signals have
* their inherited values.
*/
if (Flag(FMONITOR) && !(flags & XXCOM)) {
for (forksleep = NELEM(tt_sigs); --forksleep >= 0; )
setsig(&sigtraps[tt_sigs[forksleep]], SIG_DFL,
SS_RESTORE_DFL|SS_FORCE);
}
#endif
#if HAVE_NICE
if (Flag(FBGNICE) && (flags & XBGND))
ksh_nice(4);
#endif
if ((flags & XBGND)
#ifndef MKSH_UNEMPLOYED
&& !Flag(FMONITOR)
#endif
) {
setsig(&sigtraps[SIGINT], SIG_IGN,
SS_RESTORE_IGN|SS_FORCE);
setsig(&sigtraps[SIGQUIT], SIG_IGN,
SS_RESTORE_IGN|SS_FORCE);
if ((!(flags & (XPIPEI | XCOPROC))) &&
((forksleep = open("/dev/null", 0)) > 0)) {
(void)ksh_dup2(forksleep, 0, true);
close(forksleep);
}
}
/* in case of $(jobs) command */
remove_job(j, "child");
#ifndef MKSH_NOPROSPECTOFWORK
/* remove_job needs SIGCHLD blocked still */
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
nzombie = 0;
#ifndef MKSH_UNEMPLOYED
ttypgrp_ok = false;
Flag(FMONITOR) = 0;
#endif
Flag(FTALKING) = 0;
cleartraps();
/* no return */
execute(t, (flags & XERROK) | XEXEC, NULL);
#ifndef MKSH_SMALL
if (t->type == TPIPE)
unwind(LLEAVE);
internal_warningf("%s: execute() returned", "exchild");
fptreef(shl_out, 8, "%s: tried to execute {\n\t%T\n}\n",
"exchild", t);
shf_flush(shl_out);
#endif
unwind(LLEAVE);
/* NOTREACHED */
}
/* shell (parent) stuff */
if (!(flags & XPIPEO)) {
/* last process in a job */
j_startjob(j);
if (flags & XCOPROC) {
j->coproc_id = coproc.id;
/* n jobs using co-process output */
coproc.njobs++;
/* j using co-process input */
coproc.job = (void *)j;
}
if (flags & XBGND) {
j_set_async(j);
if (Flag(FTALKING)) {
shf_fprintf(shl_out, "[%d]", j->job);
for (p = j->proc_list; p; p = p->next)
shf_fprintf(shl_out, Tf__d,
(int)p->pid);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
}
} else
rv = j_waitj(j, jwflags, "jw:last proc");
}
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return (rv);
}
/* start the last job: only used for $(command) jobs */
void
startlast(void)
{
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
#endif
/* no need to report error - waitlast() will do it */
if (last_job) {
/* ensure it isn't removed by check_job() */
last_job->flags |= JF_WAITING;
j_startjob(last_job);
}
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
}
/* wait for last job: only used for $(command) jobs */
int
waitlast(void)
{
int rv;
Job *j;
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
#endif
j = last_job;
if (!j || !(j->flags & JF_STARTED)) {
if (!j)
warningf(true, Tf_sD_s, "waitlast", "no last job");
else
internal_warningf(Tf_sD_s, "waitlast", Tnot_started);
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
/* not so arbitrary, non-zero value */
return (125);
}
rv = j_waitj(j, JW_NONE, "waitlast");
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return (rv);
}
/* wait for child, interruptable. */
int
waitfor(const char *cp, int *sigp)
{
int rv, ecode, flags = JW_INTERRUPT|JW_ASYNCNOTIFY;
Job *j;
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
#endif
*sigp = 0;
if (cp == NULL) {
/*
* wait for an unspecified job - always returns 0, so
* don't have to worry about exited/signaled jobs
*/
for (j = job_list; j; j = j->next)
/* AT&T ksh will wait for stopped jobs - we don't */
if (j->ppid == procpid && j->state == PRUNNING)
break;
if (!j) {
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return (-1);
}
} else if ((j = j_lookup(cp, &ecode))) {
/* don't report normal job completion */
flags &= ~JW_ASYNCNOTIFY;
if (j->ppid != procpid) {
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return (-1);
}
} else {
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
if (ecode != JL_NOSUCH)
bi_errorf(Tf_sD_s, cp, lookup_msgs[ecode]);
return (-1);
}
/* AT&T ksh will wait for stopped jobs - we don't */
rv = j_waitj(j, flags, "jw:waitfor");
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
if (rv < 0)
/* we were interrupted */
*sigp = ksh_sigmask(-rv);
return (rv);
}
/* kill (built-in) a job */
int
j_kill(const char *cp, int sig)
{
Job *j;
int rv = 0, ecode;
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
#endif
if ((j = j_lookup(cp, &ecode)) == NULL) {
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
bi_errorf(Tf_sD_s, cp, lookup_msgs[ecode]);
return (1);
}
if (j->pgrp == 0) {
/* started when !Flag(FMONITOR) */
if (kill_job(j, sig) < 0) {
bi_errorf(Tf_sD_s, cp, cstrerror(errno));
rv = 1;
}
} else {
#ifndef MKSH_UNEMPLOYED
if (j->state == PSTOPPED && (sig == SIGTERM || sig == SIGHUP))
mksh_killpg(j->pgrp, SIGCONT);
#endif
if (mksh_killpg(j->pgrp, sig) < 0) {
bi_errorf(Tf_sD_s, cp, cstrerror(errno));
rv = 1;
}
}
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return (rv);
}
#ifndef MKSH_UNEMPLOYED
/* fg and bg built-ins: called only if Flag(FMONITOR) set */
int
j_resume(const char *cp, int bg)
{
Job *j;
Proc *p;
int ecode, rv = 0;
bool running;
sigset_t omask;
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
if ((j = j_lookup(cp, &ecode)) == NULL) {
sigprocmask(SIG_SETMASK, &omask, NULL);
bi_errorf(Tf_sD_s, cp, lookup_msgs[ecode]);
return (1);
}
if (j->pgrp == 0) {
sigprocmask(SIG_SETMASK, &omask, NULL);
bi_errorf("job not job-controlled");
return (1);
}
if (bg)
shprintf("[%d] ", j->job);
running = false;
for (p = j->proc_list; p != NULL; p = p->next) {
if (p->state == PSTOPPED) {
p->state = PRUNNING;
p->status = 0;
running = true;
}
shf_puts(p->command, shl_stdout);
if (p->next)
shf_puts("| ", shl_stdout);
}
shf_putc('\n', shl_stdout);
shf_flush(shl_stdout);
if (running)
j->state = PRUNNING;
put_job(j, PJ_PAST_STOPPED);
if (bg)
j_set_async(j);
else {
/* attach tty to job */
if (j->state == PRUNNING) {
if (ttypgrp_ok && (j->flags & JF_SAVEDTTY))
mksh_tcset(tty_fd, &j->ttystat);
/* See comment in j_waitj regarding saved_ttypgrp. */
if (ttypgrp_ok &&
tcsetpgrp(tty_fd, (j->flags & JF_SAVEDTTYPGRP) ?
j->saved_ttypgrp : j->pgrp) < 0) {
rv = errno;
if (j->flags & JF_SAVEDTTY)
mksh_tcset(tty_fd, &tty_state);
sigprocmask(SIG_SETMASK, &omask, NULL);
bi_errorf(Tf_ldfailed,
"fg: 1st", "tcsetpgrp", tty_fd,
(long)((j->flags & JF_SAVEDTTYPGRP) ?
j->saved_ttypgrp : j->pgrp),
cstrerror(rv));
return (1);
}
}
j->flags |= JF_FG;
j->flags &= ~JF_KNOWN;
if (j == async_job)
async_job = NULL;
}
if (j->state == PRUNNING && mksh_killpg(j->pgrp, SIGCONT) < 0) {
int eno = errno;
if (!bg) {
j->flags &= ~JF_FG;
if (ttypgrp_ok && (j->flags & JF_SAVEDTTY))
mksh_tcset(tty_fd, &tty_state);
if (ttypgrp_ok && tcsetpgrp(tty_fd, kshpgrp) < 0)
warningf(true, Tf_ldfailed,
"fg: 2nd", "tcsetpgrp", tty_fd,
(long)kshpgrp, cstrerror(errno));
}
sigprocmask(SIG_SETMASK, &omask, NULL);
bi_errorf(Tf_s_sD_s, "can't continue job",
cp, cstrerror(eno));
return (1);
}
if (!bg) {
if (ttypgrp_ok) {
j->flags &= ~(JF_SAVEDTTY | JF_SAVEDTTYPGRP);
}
rv = j_waitj(j, JW_NONE, "jw:resume");
}
sigprocmask(SIG_SETMASK, &omask, NULL);
return (rv);
}
#endif
/* are there any running or stopped jobs ? */
int
j_stopped_running(void)
{
Job *j;
int which = 0;
for (j = job_list; j != NULL; j = j->next) {
#ifndef MKSH_UNEMPLOYED
if (j->ppid == procpid && j->state == PSTOPPED)
which |= 1;
#endif
if (Flag(FLOGIN) && !Flag(FNOHUP) && procpid == kshpid &&
j->ppid == procpid && j->state == PRUNNING)
which |= 2;
}
if (which) {
shellf("You have %s%s%s jobs\n",
which & 1 ? "stopped" : "",
which == 3 ? " and " : "",
which & 2 ? "running" : "");
return (1);
}
return (0);
}
/* list jobs for jobs built-in */
int
j_jobs(const char *cp, int slp,
/* 0: short, 1: long, 2: pgrp */
int nflag)
{
Job *j, *tmp;
int how, zflag = 0;
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
#endif
if (nflag < 0) {
/* kludge: print zombies */
nflag = 0;
zflag = 1;
}
if (cp) {
int ecode;
if ((j = j_lookup(cp, &ecode)) == NULL) {
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
bi_errorf(Tf_sD_s, cp, lookup_msgs[ecode]);
return (1);
}
} else
j = job_list;
how = slp == 0 ? JP_MEDIUM : (slp == 1 ? JP_LONG : JP_PGRP);
for (; j; j = j->next) {
if ((!(j->flags & JF_ZOMBIE) || zflag) &&
(!nflag || (j->flags & JF_CHANGED))) {
j_print(j, how, shl_stdout);
if (j->state == PEXITED || j->state == PSIGNALLED)
j->flags |= JF_REMOVE;
}
if (cp)
break;
}
/* Remove jobs after printing so there won't be multiple + or - jobs */
for (j = job_list; j; j = tmp) {
tmp = j->next;
if (j->flags & JF_REMOVE)
remove_job(j, Tjobs);
}
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
#endif
return (0);
}
/* list jobs for top-level notification */
void
j_notify(void)
{
Job *j, *tmp;
#ifndef MKSH_NOPROSPECTOFWORK