This is simple testing program for revision 185647.

It invokes multiple parallel threads and each thread calls vfork()
system call.

Approved by: kib

tools/test/pthread_vfork/pthread_vfork_test.c

@@ -0,0 +1,81 @@
+/*-
+ * Copyright (c) 2008 Ganbold Tsagaankhuu
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <err.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define NUM_THREADS 100
+
+void *
+vfork_test(void *threadid)
+{
+	pid_t pid;
+
+	for (;;) {
+		pid = vfork();
+		if (pid == 0)
+			_exit(0);
+		else if (pid == -1)
+			err(1, "Failed to vfork");
+	}
+	return (NULL);
+}
+
+/*
+ * This program invokes multiple threads and each thread calls
+ * vfork() system call.
+ */
+int
+main(void)
+{
+	pthread_t threads[NUM_THREADS];
+	struct sigaction reapchildren;
+	int rc, t;
+
+	memset(&reapchildren, 0, sizeof(reapchildren));
+	reapchildren.sa_handler = SIG_IGN;
+
+	/* Automatically reap zombies. */
+	if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
+		err(1, "Could not sigaction(SIGCHLD)");
+
+	for (t = 0; t < NUM_THREADS; t++) {
+		rc = pthread_create(&threads[t], NULL, vfork_test, (void *)t);
+		if (rc)
+			errc(1, rc, "pthread_create");
+	}
+	return (0);
+}