Rework the handling of the children for the pthread_vfork_test. The

trivial handler for SIGCHLD is installed, and SIGCHLD is blocked, to
not abandon our zombies to init(8). This way, the zombies are around
slightly longer, allowing to actually exercise the logic for p_pwait
use by the test.

MFC after:	1 week

1 files changed, 25 insertions, 7 deletions

diff --git a/tools/test/pthread_vfork/pthread_vfork_test.c b/tools/test/pthread_vfork/pthread_vfork_test.c
index e00472713dfd..925c86255738 100644
--- a/tools/test/pthread_vfork/pthread_vfork_test.c
+++ b/tools/test/pthread_vfork/pthread_vfork_test.c
@@ -29,6 +29,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include <sys/types.h>
+#include <sys/wait.h>
 #include <err.h>
 #include <pthread.h>
 #include <signal.h>
@@ -39,10 +41,11 @@ __FBSDID("$FreeBSD$");
 
 #define NUM_THREADS 100
 
-void *
-vfork_test(void *threadid)
+static void *
+vfork_test(void *threadid __unused)
 {
-	pid_t pid;
+	pid_t pid, wpid;
+	int status;
 
 	for (;;) {
 		pid = vfork();
@@ -50,10 +53,20 @@ vfork_test(void *threadid)
 			_exit(0);
 		else if (pid == -1)
 			err(1, "Failed to vfork");
+		else {
+			wpid = waitpid(pid, &status, 0);
+			if (wpid == -1)
+				err(1, "waitpid");
+		}
 	}
 	return (NULL);
 }
 
+static void
+sighandler(int signo __unused)
+{
+}
+
 /*
  * This program invokes multiple threads and each thread calls
  * vfork() system call.
@@ -63,19 +76,24 @@ main(void)
 {
 	pthread_t threads[NUM_THREADS];
 	struct sigaction reapchildren;
+	sigset_t sigchld_mask;
 	int rc, t;
 
 	memset(&reapchildren, 0, sizeof(reapchildren));
-	reapchildren.sa_handler = SIG_IGN;
-
-	/* Automatically reap zombies. */
+	reapchildren.sa_handler = sighandler;
 	if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
 		err(1, "Could not sigaction(SIGCHLD)");
 
+	sigemptyset(&sigchld_mask);
+	sigaddset(&sigchld_mask, SIGCHLD);
+	if (sigprocmask(SIG_BLOCK, &sigchld_mask, NULL) == -1)
+		err(1, "sigprocmask");
+
 	for (t = 0; t < NUM_THREADS; t++) {
-		rc = pthread_create(&threads[t], NULL, vfork_test, (void *)t);
+		rc = pthread_create(&threads[t], NULL, vfork_test, &t);
 		if (rc)
 			errc(1, rc, "pthread_create");
 	}
+	pause();
 	return (0);
 }