svn commit: r326953 - head/tests/sys/kern

[John Baldwin]

Author: jhb
Date: Mon Dec 18 23:35:14 2017
New Revision: 326953
URL: https://svnweb.freebsd.org/changeset/base/326953

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

Modified:
  head/tests/sys/kern/ptrace_test.c

Modified: head/tests/sys/kern/ptrace_test.c
==============================================================================
--- head/tests/sys/kern/ptrace_test.c	Mon Dec 18 22:55:19 2017	(r326952)
+++ head/tests/sys/kern/ptrace_test.c	Mon Dec 18 23:35:14 2017	(r326953)
@@ -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);
 	}
 }