Date: Thu, 22 May 1997 22:55:26 -0700 (PDT) From: dholland@eecs.harvard.edu To: freebsd-gnats-submit@FreeBSD.ORG Subject: bin/3668: /bin/sh knows too much about wait() Message-ID: <199705230555.WAA02625@hub.freebsd.org> Resent-Message-ID: <199705230600.XAA02744@hub.freebsd.org>
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>Number: 3668
>Category: bin
>Synopsis: /bin/sh knows too much about wait()
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu May 22 23:00:01 PDT 1997
>Last-Modified:
>Originator: David A. Holland
>Organization:
VINO, Harvard University
>Release: see below
>Environment:
N/A
>Description:
sh knows too much about the bit fields returned by wait(), instead of
using the WIF... macros in <sys/wait.h>. This means if you change the
bit fields (eg to support >256 signals), sh breaks in strange ways.
This problem was found in netbsd's sh but apparently applies to freebsd
too, so I'm sending the patch along.
>How-To-Repeat:
n/a
>Fix:
If this patch has been garbaged by netscape or other web stuff please
mail me for a fixed copy. :-/
also please note that the patch is in fact against netbsd and I haven't
tried applying it to freebsd's sh.
Index: jobs.c
===================================================================
RCS file: /home/vino/repo/src/utils/bsd/bin/sh/jobs.c,v
retrieving revision 1.1.1.1
diff -u -3 -r1.1.1.1 jobs.c
--- jobs.c 1997/04/10 18:32:45 1.1.1.1
+++ jobs.c 1997/05/22 22:07:22
@@ -241,7 +241,7 @@
INTOFF;
killpg(jp->ps[0].pid, SIGCONT);
for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
- if ((ps->status & 0377) == 0177) {
+ if (WIFSTOPPED(ps->status)) {
ps->status = -1;
jp->state = 0;
}
@@ -304,19 +304,21 @@
if (ps->status == -1) {
/* don't print anything */
- } else if ((ps->status & 0xFF) == 0) {
- fmtstr(s, 64, "Exit %d", ps->status >> 8);
+ } else if (WIFEXITED(ps->status)) {
+ fmtstr(s, 64, "Exit %d",
+ WEXITSTATUS(ps->status));
} else {
- i = ps->status;
#if JOBS
- if ((i & 0xFF) == 0177)
- i >>= 8;
+ if (WIFSTOPPED(ps->status))
+ i = WSTOPSIG(ps->status);
+ else /* WIFSIGNALED(ps->status) */
#endif
+ i = WTERMSIG(ps->status);
if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
scopy(sys_siglist[i & 0x7F], s);
else
fmtstr(s, 64, "Signal %d", i & 0x7F);
- if (i & 0x80)
+ if (WCOREDUMP(ps->status))
strcat(s, " (core dumped)");
}
out1str(s);
@@ -372,7 +374,7 @@
char **argv;
{
struct job *job;
- int status;
+ int status, retval;
struct job *jp;
if (argc > 1) {
@@ -384,17 +386,19 @@
if (job != NULL) {
if (job->state) {
status = job->ps[job->nprocs - 1].status;
- if ((status & 0xFF) == 0)
- status = status >> 8 & 0xFF;
+ if (WIFEXITED(status))
+ retval = WEXITSTATUS(status);
#if JOBS
- else if ((status & 0xFF) == 0177)
- status = (status >> 8 & 0x7F) + 128;
+ else if (WIFSTOPPED(status))
+ retval = WSTOPSIG(status) + 128;
#endif
- else
- status = (status & 0x7F) + 128;
+ else {
+ /* XXX */
+ retval = WTERMSIG(status) + 128;
+ }
if (! iflag)
freejob(job);
- return status;
+ return retval;
}
} else {
for (jp = jobtab ; ; jp++) {
@@ -713,18 +717,18 @@
#endif
status = jp->ps[jp->nprocs - 1].status;
/* convert to 8 bits */
- if ((status & 0xFF) == 0)
- st = status >> 8 & 0xFF;
+ if (WIFEXITED(status))
+ st = WEXITSTATUS(status);
#if JOBS
- else if ((status & 0xFF) == 0177)
- st = (status >> 8 & 0x7F) + 128;
+ else if (WIFSTOPPED(status))
+ st = WSTOPSIG(status) + 128;
#endif
else
- st = (status & 0x7F) + 128;
+ st = WTERMSIG(status) + 128;
if (! JOBS || jp->state == JOBDONE)
freejob(jp);
CLEAR_PENDING_INT;
- if ((status & 0x7F) == SIGINT)
+ if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
kill(getpid(), SIGINT);
INTON;
return st;
@@ -749,6 +753,7 @@
int done;
int stopped;
int core;
+ int sig;
TRACE(("dowait(%d) called\n", block));
do {
@@ -767,13 +772,13 @@
if (sp->pid == -1)
continue;
if (sp->pid == pid) {
- TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
+ TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
sp->status = status;
thisjob = jp;
}
if (sp->status == -1)
stopped = 0;
- else if ((sp->status & 0377) == 0177)
+ else if (WIFSTOPPED(sp->status))
done = 0;
}
if (stopped) { /* stopped or done */
@@ -791,29 +796,32 @@
}
INTON;
if (! rootshell || ! iflag || (job && thisjob == job)) {
+ core = WCOREDUMP(status);
#if JOBS
- if ((status & 0xFF) == 0177)
- status >>= 8;
+ if (WIFSTOPPED(status)) sig = WSTOPSIG(status);
+ else
#endif
- core = status & 0x80;
- status &= 0x7F;
- if (status != 0 && status != SIGINT && status != SIGPIPE) {
+ if (WIFEXITED(status)) sig = 0;
+ else sig = WTERMSIG(status);
+
+ if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
if (thisjob != job)
outfmt(out2, "%d: ", pid);
#if JOBS
- if (status == SIGTSTP && rootshell && iflag)
+ if (sig == SIGTSTP && rootshell && iflag)
outfmt(out2, "%%%d ", job - jobtab + 1);
#endif
- if (status < NSIG && sys_siglist[status])
- out2str(sys_siglist[status]);
+ if (sig < NSIG && sys_siglist[sig])
+ out2str(sys_siglist[sig]);
else
- outfmt(out2, "Signal %d", status);
+ outfmt(out2, "Signal %d", sig);
if (core)
out2str(" - core dumped");
out2c('\n');
flushout(&errout);
} else {
- TRACE(("Not printing status: status=%d\n", status));
+ TRACE(("Not printing status: status=%d, sig=%d\n",
+ status, sig));
}
} else {
TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
>Audit-Trail:
>Unformatted:
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