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timeout: handle zombie grandchildren

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timeout previously collected only one child status with wait(2). If this
was one of the grandchildren timeout would return to sigsuspend and wait
until the timeout expired. Instead, loop for all children.

PR:		kern/197608
Reviewed by:	bapt, kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2015-02-15 20:10:53 +00:00
parent caa918bd3b
commit b0aa0c6e1b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=278810
1 changed files with 19 additions and 13 deletions
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32
usr.bin/timeout/timeout.c
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@ -172,6 +172,7 @@ main(int argc, char **argv)
double second_kill;
bool timedout = false;
bool do_second_kill = false;
bool child_done = false;
struct sigaction signals;
struct procctl_reaper_status info;
struct procctl_reaper_kill killemall;
@ -187,7 +188,6 @@ main(int argc, char **argv)
foreground = preserve = 0;
second_kill = 0;
cpid = -1;
const struct option longopts[] = {
{ "preserve-status", no_argument, &preserve, 1 },
@ -281,20 +281,26 @@ main(int argc, char **argv)
if (sig_chld) {
sig_chld = 0;
while (((cpid = wait(&status)) < 0) && errno == EINTR)
continue;
if (cpid == pid) {
pstat = status;
if (!foreground)
break;
while ((cpid = waitpid(-1, &status, WNOHANG)) != 0) {
if (cpid < 0) {
if (errno == EINTR)
continue;
else
break;
} else if (cpid == pid) {
pstat = status;
child_done = true;
}
}
if (!foreground) {
procctl(P_PID, getpid(), PROC_REAP_STATUS,
&info);
if (info.rs_children == 0) {
cpid = pid;
if (child_done) {
if (foreground) {
break;
} else {
procctl(P_PID, getpid(),
PROC_REAP_STATUS, &info);
if (info.rs_children == 0)
break;
}
}
} else if (sig_alrm) {
@ -336,7 +342,7 @@ main(int argc, char **argv)
}
}
while (cpid != pid && wait(&pstat) == -1) {
while (!child_done && wait(&pstat) == -1) {
if (errno != EINTR)
err(EX_OSERR, "waitpid()");
}