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/* $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;
}
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