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Catch up to r325719 which makes the kern.proc.pid sysctl "work" for zombies.

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Some of the ptrace tests need to wait for a child process to become a
zombie before preceding.  The parent process polls the child process
via the kern.proc.pid sysctl to wait for it to become a zombie.
Previously the code polled until the sysctl failed with ESRCH.  Now it
will poll until either the sysctl fails with ESRCH (for compatiblity
with older kernels) or returns a kinfo_proc structure with the ki_stat
field set to SZOMB.

Reported by:	Jenkins
Tested by:	markj
Discussed with:	mjg
MFC after:	1 week
This commit is contained in:
John Baldwin 2017-12-18 23:35:14 +00:00
parent 989c7f0b7c
commit 3a014c56c1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=326953
1 changed files with 6 additions and 1 deletions
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7
tests/sys/kern/ptrace_test.c
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@ -104,6 +104,10 @@ wait_for_zombie(pid_t pid)
/*
* Wait for a process to exit. This is kind of gross, but
* there is not a better way.
*
* Prior to r325719, the kern.proc.pid.<pid> sysctl failed
* with ESRCH. After that change, a valid struct kinfo_proc
* is returned for zombies with ki_stat set to SZOMB.
*/
for (;;) {
struct kinfo_proc kp;
@ -116,10 +120,11 @@ wait_for_zombie(pid_t pid)
mib[3] = pid;
len = sizeof(kp);
if (sysctl(mib, nitems(mib), &kp, &len, NULL, 0) == -1) {
/* The KERN_PROC_PID sysctl fails for zombies. */
ATF_REQUIRE(errno == ESRCH);
break;
}
if (kp.ki_stat == SZOMB)
break;
usleep(5000);
}
}