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

descriptor, with some of them blocking on data that will never
arrive.

2 files changed, 123 insertions, 0 deletions

diff --git a/regress/lib/libpthread/blocked_dup2/Makefile b/regress/lib/libpthread/blocked_dup2/Makefile
new file mode 100644
index 00000000000..26e771e0744
--- /dev/null
+++ b/regress/lib/libpthread/blocked_dup2/Makefile
@@ -0,0 +1,5 @@
+# $OpenBSD: Makefile,v 1.1 2006/09/22 18:31:06 kurt Exp $
+
+PROG=	blocked_dup2
+
+.include <bsd.regress.mk>
diff --git a/regress/lib/libpthread/blocked_dup2/blocked_dup2.c b/regress/lib/libpthread/blocked_dup2/blocked_dup2.c
new file mode 100644
index 00000000000..a79c6031a3c
--- /dev/null
+++ b/regress/lib/libpthread/blocked_dup2/blocked_dup2.c
@@ -0,0 +1,118 @@
+/*	$OpenBSD: blocked_dup2.c,v 1.1 2006/09/22 18:31:06 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, with some of them blocking on data that will never
+ * arrive.
+ */
+
+#include <pthread.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include "test.h"
+
+#define ITERATIONS	100
+#define BUSY_THREADS	5
+#define WAITING_THREADS	5
+
+static void *
+deadlock_detector(void *arg)
+{
+	sleep(60);
+	PANIC("deadlock detected");
+}
+
+static void *
+waiting_read(void *arg)
+{
+	int fd = (int)arg;
+	struct sockaddr remote_addr;
+	char readBuf;
+	int n, remote_addr_len = sizeof(struct sockaddr);
+
+	n = recvfrom(fd, &readBuf, 1, 0, &remote_addr, &remote_addr_len);
+
+	if (n == -1)
+		return ((void *)errno);
+	else
+		return (0);
+}
+
+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];
+	pthread_t waiting_threads[WAITING_THREADS];
+	pthread_t deadlock_thread;
+	struct sockaddr_in addr;
+	int fd, newfd, i, j;
+	void *value_ptr;
+	struct timespec rqtp;
+
+	rqtp.tv_sec = 0;
+	rqtp.tv_nsec = 1000000;
+
+	bzero((char *) &addr, sizeof addr);
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	addr.sin_port = htons(0);
+
+	CHECKr(pthread_create(&deadlock_thread, NULL,
+	    deadlock_detector, NULL));
+
+	CHECKe(fd = socket(AF_INET, SOCK_DGRAM, 0));
+ 	CHECKr(bind(fd, (struct sockaddr *)&addr, sizeof(addr)));
+
+	CHECKe(newfd = socket(AF_INET, SOCK_DGRAM, 0));
+ 	CHECKr(bind(newfd, (struct sockaddr *)&addr, sizeof(addr)));
+
+	for (i = 0; i < ITERATIONS; i++) {
+		for (j = 0; j < BUSY_THREADS; j++)
+			CHECKr(pthread_create(&busy_threads[j], NULL,
+			    busy_thread, (void *)newfd));
+		for (j = 0; j < WAITING_THREADS; j++)
+			CHECKr(pthread_create(&waiting_threads[j], NULL,
+			    waiting_read, (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);
+		}
+		for (j = 0; j < WAITING_THREADS; j++) {
+			CHECKr(pthread_join(waiting_threads[j], &value_ptr));
+			ASSERT(value_ptr == (void *)EBADF);
+		}
+	}	
+	SUCCEED;
+}