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minix/bin/csh/proc.c

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/* $NetBSD: proc.c,v 1.36 2013/07/16 17:47:43 christos Exp $ */
/*-
* Copyright (c) 1980, 1991, 1993
* 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)proc.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: proc.c,v 1.36 2013/07/16 17:47:43 christos Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "csh.h"
#include "dir.h"
#include "extern.h"
#include "proc.h"
#define BIGINDEX 9 /* largest desirable job index */
extern int insource;
static void pflushall(void);
static void pflush(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 **v, int);
static struct process *pgetcurr(struct process *);
static void okpcntl(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!
*/
/* ARGSUSED */
void
pchild(int notused)
{
struct rusage ru;
struct process *fp, *pp;
int jobflags, pid, w;
loop:
errno = 0; /* reset, just in case */
pid = wait3(&w,
(setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru);
if (pid <= 0) {
if (errno == EINTR) {
errno = 0;
goto loop;
}
pnoprocesses = pid == -1;
return;
}
for (pp = proclist.p_next; pp != NULL; pp = pp->p_next)
if (pid == pp->p_pid)
goto found;
goto loop;
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))
(void)clock_gettime(CLOCK_MONOTONIC, &pp->p_etime);
pp->p_rusage = ru;
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) &&
fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec
>= 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
!eq(dcwd->di_name, fp->p_cwd->di_name)) {
; /* print in pjwait */
}
/* PWP: print a newline after ^C */
else if (jobflags & PINTERRUPTED) {
(void)vis_fputc('\r' | QUOTE, cshout);
(void)fputc('\n', cshout);
}
}
else {
if (jobflags & PNOTIFY || adrof(STRnotify)) {
(void)vis_fputc('\r' | QUOTE, cshout);
(void)fputc('\n', cshout);
(void)pprint(pp, NUMBER | NAME | REASON);
if ((jobflags & PSTOPPED) == 0)
pflush(pp);
}
else {
fp->p_flags |= PNEEDNOTE;
neednote++;
}
}
}
goto loop;
}
void
pnote(void)
{
struct process *pp;
sigset_t osigset, nsigset;
int flags;
neednote = 0;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) {
if (pp->p_flags & PNEEDNOTE) {
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
pp->p_flags &= ~PNEEDNOTE;
flags = pprint(pp, NUMBER | NAME | REASON);
if ((flags & (PRUNNING | PSTOPPED)) == 0)
pflush(pp);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
}
}
}
/*
* pwait - wait for current job to terminate, maintaining integrity
* of current and previous job indicators.
*/
void
pwait(void)
{
struct process *fp, *pp;
sigset_t osigset, nsigset;
/*
* Here's where dead procs get flushed.
*/
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
for (pp = (fp = &proclist)->p_next; pp != NULL; 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;
}
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
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;
sigset_t osigset, nsigset;
int jobflags, reason;
while (pp->p_pid != pp->p_jobid)
pp = pp->p_friends;
fp = pp;
do {
if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING)
(void)fprintf(csherr, "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(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
for (;;) {
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, NULL);
jobflags = 0;
do
jobflags |= fp->p_flags;
while ((fp = (fp->p_friends)) != pp);
if ((jobflags & PRUNNING) == 0)
break;
#ifdef JOBDEBUG
(void)fprintf(csherr, "starting to sigsuspend for SIGCHLD on %d\n",
fp->p_pid);
#endif /* JOBDEBUG */
nsigset = osigset;
(void)sigdelset(&nsigset, SIGCHLD);
(void)sigsuspend(&nsigset);
}
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
if (tpgrp > 0) /* get tty back */
(void)tcsetpgrp(FSHTTY, tpgrp);
if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) ||
!eq(dcwd->di_name, fp->p_cwd->di_name)) {
if (jobflags & PSTOPPED) {
(void) fputc('\n', cshout);
if (adrof(STRlistjobs)) {
Char *jobcommand[3];
jobcommand[0] = STRjobs;
if (eq(value(STRlistjobs), STRlong))
jobcommand[1] = STRml;
else
jobcommand[1] = NULL;
jobcommand[2] = NULL;
dojobs(jobcommand, NULL);
(void)pprint(pp, SHELLDIR);
}
else
(void)pprint(pp, AREASON | SHELLDIR);
}
else
(void)pprint(pp, AREASON | SHELLDIR);
}
if ((jobflags & (PINTERRUPTED | PSTOPPED)) && setintr &&
(!gointr || !eq(gointr, STRminus))) {
if ((jobflags & PSTOPPED) == 0)
pflush(pp);
pintr1(0);
}
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))) {
(void)fprintf(cshout, "Exit %d\n", reason);
}
set(STRstatus, putn(reason));
if (reason && exiterr)
exitstat();
pflush(pp);
}
/*
* dowait - wait for all processes to finish
*/
void
/*ARGSUSED*/
dowait(Char **v, struct command *t)
{
struct process *pp;
sigset_t osigset, nsigset;
pjobs++;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
loop:
for (pp = proclist.p_next; pp; pp = pp->p_next)
if (pp->p_pid && /* pp->p_pid == pp->p_jobid && */
pp->p_flags & PRUNNING) {
sigemptyset(&nsigset);
(void)sigsuspend(&nsigset);
goto loop;
}
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
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_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(struct process *pp)
{
struct process *np;
int idx;
if (pp->p_pid == 0) {
(void)fprintf(csherr, "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(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;
/*
* palloc - allocate a process structure and fill it up.
* an important assumption is made that the process is running.
*/
void
palloc(int pid, struct command *t)
{
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 |= PERR;
}
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)
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;
(void)clock_gettime(CLOCK_MONOTONIC, &pp->p_btime);
}
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;
}
padd(t->t_dcdr);
return;
}
if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) {
pads((t->t_dflg & F_READ) ? STRspLarrow2sp : STRspLarrowsp);
pads(t->t_dlef);
}
if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) {
pads((t->t_dflg & F_APPEND) ? STRspRarrow2 : STRspRarrow);
if (t->t_dflg & F_STDERR)
pads(STRand);
pads(STRspace);
pads(t->t_drit);
}
}
static void
pads(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;
}
/*
* prestjob - opposite of psavejob. This may be missed if we are interrupted
* somewhere, but pendjob cleans up anyway.
*/
void
prestjob(void)
{
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_pid != pp->p_jobid)
pp = pp->p_friends;
(void)fprintf(cshout, "[%d]", pp->p_index);
tp = pp;
do {
(void)fprintf(cshout, " %ld", (long)pp->p_pid);
pp = pp->p_friends;
} while (pp != tp);
(void)fputc('\n', cshout);
}
pholdjob = pcurrjob = 0;
}
/*
* pprint - print a job
*/
static int
pprint(struct process *pp, int flag)
{
static struct rusage zru;
struct process *tp;
const char *format;
int jobflags, pstatus, reason, status;
int hadnl;
hadnl = 1; /* did we just have a newline */
(void)fpurge(cshout);
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 && !hadnl && !(flag & FANCY) &&
((pstatus == status && pp->p_reason == reason) ||
!(flag & REASON))) {
(void)fputc(' ', cshout);
hadnl = 0;
}
else {
if (tp != pp && !hadnl) {
(void)fputc('\n', cshout);
hadnl = 1;
}
if (flag & NUMBER) {
if (pp == tp)
(void)fprintf(cshout, "[%d]%s %c ", pp->p_index,
pp->p_index < 10 ? " " : "",
pp == pcurrent ? '+' :
(pp == pprevious ? '-' : ' '));
else
(void)fprintf(cshout, " ");
hadnl = 0;
}
if (flag & FANCY) {
(void)fprintf(cshout, "%5ld ", (long)pp->p_pid);
hadnl = 0;
}
if (flag & (REASON | AREASON)) {
if (flag & NAME)
format = "%-23s";
else
format = "%s";
if (pstatus == status) {
if (pp->p_reason == reason) {
(void)fprintf(cshout, format, "");
hadnl = 0;
goto prcomd;
}
else
reason = pp->p_reason;
} else {
status = pstatus;
reason = pp->p_reason;
}
switch (status) {
case PRUNNING:
(void)fprintf(cshout, format, "Running ");
hadnl = 0;
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))) {
(void)fprintf(cshout, format,
sys_siglist[(unsigned char)
pp->p_reason]);
hadnl = 0;
}
break;
case PNEXITED:
case PAEXITED:
if (flag & REASON) {
if (pp->p_reason)
(void)fprintf(cshout, "Exit %-18d", pp->p_reason);
else
(void)fprintf(cshout, format, "Done");
hadnl = 0;
}
break;
default:
(void)fprintf(csherr, "BUG: status=%-9o", status);
}
}
}
prcomd:
if (flag & NAME) {
(void)fprintf(cshout, "%s", vis_str(pp->p_command));
if (pp->p_flags & PPOU)
(void)fprintf(cshout, " |");
if (pp->p_flags & PERR)
(void)fputc('&', cshout);
hadnl = 0;
}
if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED) {
(void)fprintf(cshout, " (core dumped)");
hadnl = 0;
}
if (tp == pp->p_friends) {
if (flag & AMPERSAND) {
(void)fprintf(cshout, " &");
hadnl = 0;
}
if (flag & JOBDIR &&
!eq(tp->p_cwd->di_name, dcwd->di_name)) {
(void)fprintf(cshout, " (wd: ");
dtildepr(value(STRhome), tp->p_cwd->di_name);
(void)fputc(')', cshout);
hadnl = 0;
}
}
if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) {
if (!hadnl)
(void)fprintf(cshout, "\n\t");
prusage(cshout, &zru, &pp->p_rusage, &pp->p_etime,
&pp->p_btime);
hadnl = 1;
}
if (tp == pp->p_friends) {
if (!hadnl) {
(void)fputc('\n', cshout);
hadnl = 1;
}
if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) {
(void)fprintf(cshout, "(wd now: ");
dtildepr(value(STRhome), dcwd->di_name);
(void)fprintf(cshout, ")\n");
hadnl = 1;
}
}
} while ((pp = pp->p_friends) != tp);
if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) {
if (jobflags & NUMBER)
(void)fprintf(cshout, " ");
ptprint(tp);
hadnl = 1;
}
(void)fflush(cshout);
return (jobflags);
}
static void
ptprint(struct process *tp)
{
static struct rusage zru;
static struct timespec ztime;
struct rusage ru;
struct timespec tetime, diff;
struct process *pp;
pp = tp;
ru = zru;
tetime = ztime;
do {
ruadd(&ru, &pp->p_rusage);
timespecsub(&pp->p_etime, &pp->p_btime, &diff);
if (timespeccmp(&diff, &tetime, >))
tetime = diff;
} while ((pp = pp->p_friends) != tp);
prusage(cshout, &zru, &ru, &tetime, &ztime);
}
/*
* dojobs - print all jobs
*/
void
/*ARGSUSED*/
dojobs(Char **v, struct command *t)
{
struct process *pp;
int flag, i;
flag = NUMBER | NAME | REASON;
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
/*ARGSUSED*/
dofg(Char **v, struct command *t)
{
struct process *pp;
okpcntl();
++v;
do {
pp = pfind(*v);
pstart(pp, 1);
pjwait(pp);
} while (*v && *++v);
}
/*
* %... - builtin - put the job into the foreground
*/
void
/*ARGSUSED*/
dofg1(Char **v, struct command *t)
{
struct process *pp;
okpcntl();
pp = pfind(v[0]);
pstart(pp, 1);
pjwait(pp);
}
/*
* dobg - builtin - put the job into the background
*/
void
/*ARGSUSED*/
dobg(Char **v, struct command *t)
{
struct process *pp;
okpcntl();
++v;
do {
pp = pfind(*v);
pstart(pp, 0);
} while (*v && *++v);
}
/*
* %... & - builtin - put the job into the background
*/
void
/*ARGSUSED*/
dobg1(Char **v, struct command *t)
{
struct process *pp;
pp = pfind(v[0]);
pstart(pp, 0);
}
/*
* dostop - builtin - stop the job
*/
void
/*ARGSUSED*/
dostop(Char **v, struct command *t)
{
pkill(++v, SIGSTOP);
}
/*
* dokill - builtin - superset of kill (1)
*/
void
/*ARGSUSED*/
dokill(Char **v, struct command *t)
{
Char *signame;
char *name;
long signum;
char *ep;
signum = SIGTERM;
v++;
if (v[0] && v[0][0] == '-') {
if (v[0][1] == 'l') {
if (v[1]) {
if (!Isdigit(v[1][0]))
stderror(ERR_NAME | ERR_BADSIG);
signum = strtol(short2str(v[1]), &ep, 10);
if (signum < 0 || signum >= NSIG)
stderror(ERR_NAME | ERR_BADSIG);
else if (signum == 0)
(void)fputc('0', cshout); /* 0's symbolic name is '0' */
else
(void)fprintf(cshout, "%s ", sys_signame[signum]);
} else {
for (signum = 1; signum < NSIG; signum++) {
(void)fprintf(cshout, "%s ", sys_signame[signum]);
if (signum == NSIG / 2)
(void)fputc('\n', cshout);
}
}
(void)fputc('\n', cshout);
return;
}
if (Isdigit(v[0][1])) {
signum = strtol(short2str(v[0] + 1), &ep, 10);
if (signum < 0 || signum >= NSIG || *ep)
stderror(ERR_NAME | ERR_BADSIG);
}
else {
if (v[0][1] == 's' && v[0][2] == '\0')
signame = *(++v);
else
signame = &v[0][1];
if (signame == NULL || v[1] == NULL)
stderror(ERR_NAME | ERR_TOOFEW);
name = short2str(signame);
for (signum = 1; signum < NSIG; signum++)
if (!strcasecmp(sys_signame[signum], name) ||
(!strncasecmp("SIG", name, 3) && /* skip "SIG" prefix */
!strcasecmp(sys_signame[signum], name + 3)))
break;
if (signum == NSIG) {
if (signame[0] == '0')
signum = 0;
else {
setname(vis_str(signame));
stderror(ERR_NAME | ERR_UNKSIG);
}
}
}
v++;
}
pkill(v, (int)signum);
}
static void
pkill(Char **v, int signum)
{
struct process *pp, *np;
Char *cp;
sigset_t nsigset;
int err1, jobflags, pid;
char *ep;
jobflags = 0;
err1 = 0;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
if (setintr)
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_BLOCK, &nsigset, NULL);
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);
switch (signum) {
case SIGSTOP:
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
if ((jobflags & PRUNNING) == 0) {
(void)fprintf(csherr, "%s: Already suspended\n",
vis_str(cp));
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;
}
if (kill(-pp->p_jobid, signum) < 0) {
(void)fprintf(csherr, "%s: %s\n", vis_str(cp),
strerror(errno));
err1++;
}
if (signum == SIGTERM || signum == SIGHUP)
(void)kill(-pp->p_jobid, SIGCONT);
}
else if (!(Isdigit(*cp) || *cp == '-'))
stderror(ERR_NAME | ERR_JOBARGS);
else {
pid = (pid_t)strtoul(short2str(cp), &ep, 0);
if (*ep) {
(void)fprintf(csherr, "%s: Badly formed number\n",
short2str(cp));
err1++;
goto cont;
} else if (kill(pid, signum) < 0) {
(void)fprintf(csherr, "%d: %s\n", pid, strerror(errno));
err1++;
goto cont;
}
if (signum == SIGTERM || signum == SIGHUP)
(void)kill((pid_t) pid, SIGCONT);
}
cont:
v++;
}
if (gargv)
blkfree(gargv), gargv = 0;
(void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL);
if (err1)
stderror(ERR_SILENT);
}
/*
* pstart - start the job in foreground/background
*/
void
pstart(struct process *pp, int foregnd)
{
struct process *np;
sigset_t osigset, nsigset;
long jobflags;
jobflags = 0;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
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);
if (foregnd)
(void)tcsetpgrp(FSHTTY, pp->p_jobid);
if (jobflags & PSTOPPED)
(void)kill(-pp->p_jobid, SIGCONT);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
}
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_pid == 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_pid == 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 */
}
/*
* pgetcurr - find most recent job that is not pp, preferably stopped
*/
static struct process *
pgetcurr(struct process *pp)
{
struct process *np, *xp;
xp = NULL;
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 == NULL)
xp = np;
}
return (xp);
}
/*
* donotify - flag the job so as to report termination asynchronously
*/
void
/*ARGSUSED*/
donotify(Char **v, struct command *t)
{
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(struct command *t /* command we are forking for */, int wanttty)
{
int pgrp, pid;
sigset_t osigset, nsigset;
int ignint;
ignint = 0;
/*
* 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.
*/
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
while ((pid = fork()) < 0)
if (setintr == 0)
(void)sleep(FORKSLEEP);
else {
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
stderror(ERR_NOPROC);
}
if (pid == 0) {
settimes();
pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
pflushall();
pcurrjob = NULL;
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);
if (wanttty >= 0) {
/* make stoppable */
(void)signal(SIGTSTP, SIG_DFL);
(void)signal(SIGTTIN, SIG_DFL);
(void)signal(SIGTTOU, SIG_DFL);
}
(void)signal(SIGTERM, parterm);
}
else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) {
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
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)
(void)setpriority(PRIO_PROCESS, 0, t->t_nice);
}
else {
if (wanttty >= 0)
(void)setpgid(pid, pcurrjob ? pcurrjob->p_jobid : pid);
palloc(pid, t);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
}
return (pid);
}
static void
okpcntl(void)
{
if (tpgrp == -1)
stderror(ERR_JOBCONTROL);
if (tpgrp == 0)
stderror(ERR_JOBCTRLSUB);
/* NOTREACHED */
}
/*
* 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). 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, int pgrp)
{
sigset_t osigset, nsigset;
/*
* christos: I am blocking the tty signals till I've set things
* correctly....
*/
if (wanttty > 0) {
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGTSTP);
(void)sigaddset(&nsigset, SIGTTIN);
(void)sigaddset(&nsigset, SIGTTOU);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
}
/*
* 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) {
(void)fprintf(csherr, "csh: setpgid error.\n");
xexit(0);
}
if (wanttty > 0) {
(void)tcsetpgrp(FSHTTY, pgrp);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
}
if (tpgrp > 0)
tpgrp = 0; /* gave tty away */
}
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