Test dup2() racing with other threads using the same file

descriptor.

2 files changed, 86 insertions, 0 deletions

diff --git a/regress/lib/libpthread/dup2_race/Makefile b/regress/lib/libpthread/dup2_race/Makefile
new file mode 100644
index 00000000000..98e0a499b99
--- /dev/null
+++ b/regress/lib/libpthread/dup2_race/Makefile
@@ -0,0 +1,5 @@
+# $OpenBSD: Makefile,v 1.1 2006/09/22 18:33:18 kurt Exp $
+
+PROG=	dup2_race
+
+.include <bsd.regress.mk>
diff --git a/regress/lib/libpthread/dup2_race/dup2_race.c b/regress/lib/libpthread/dup2_race/dup2_race.c
new file mode 100644
index 00000000000..a19b871b700
--- /dev/null
+++ b/regress/lib/libpthread/dup2_race/dup2_race.c
@@ -0,0 +1,81 @@
+/*	$OpenBSD: dup2_race.c,v 1.1 2006/09/22 18:33:18 kurt Exp $	*/
+/*
+ * Copyright (c) 2006 Kurt Miller <kurt@intricatesoftware.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Test dup2() racing with other threads using the same file
+ * descriptor.
+ */
+
+#include <pthread.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/socket.h>
+#include "test.h"
+
+#define ITERATIONS	100
+#define BUSY_THREADS	10
+
+static void *
+deadlock_detector(void *arg)
+{
+	sleep(60);
+	PANIC("deadlock detected");
+}
+
+static void *
+busy_thread(void *arg)
+{
+	int fd = (int)arg;
+
+	/* loop until error */
+	while(fcntl(fd, F_GETFD, NULL) != -1);
+
+	return ((void *)errno);
+}
+
+int
+main(int argc, char *argv[])
+{
+	pthread_t busy_threads[BUSY_THREADS], deadlock_thread;
+	int fd, newfd, i, j;
+	void *value_ptr;
+	struct timespec rqtp;
+
+	rqtp.tv_sec = 0;
+	rqtp.tv_nsec = 1000000;
+
+	CHECKr(pthread_create(&deadlock_thread, NULL,
+	    deadlock_detector, NULL));
+
+	CHECKe(fd = socket(AF_INET, SOCK_DGRAM, 0));
+
+	for (i = 0; i < 100; i++) {
+		CHECKe(newfd = socket(AF_INET, SOCK_DGRAM, 0));
+		for (j = 0; j < BUSY_THREADS; j++)
+			CHECKr(pthread_create(&busy_threads[j], NULL,
+			    busy_thread, (void *)newfd));
+		nanosleep(&rqtp, NULL);
+		CHECKr(dup2(fd, newfd));
+		for (j = 0; j < BUSY_THREADS; j++) {
+			CHECKr(pthread_join(busy_threads[j], &value_ptr));
+			ASSERT(value_ptr == (void *)EBADF);
+		}
+		CHECKe(close(newfd));
+	}	
+	SUCCEED;
+}