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/* $OpenBSD: dup2_accept.c,v 1.3 2018/07/10 08:08:00 mpi Exp $ */
/*
* Copyright (c) 2018 Martin Pieuchot
*
* 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.
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <pthread.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
/*
* Listen on localhost:TEST_PORT for a connection
*/
#define TEST_PORT 9876
static void *
dupper(void *arg)
{
struct sockaddr_in addr;
int s;
sleep(1);
s = socket(PF_INET, SOCK_STREAM, 0);
if (s == -1)
err(1, "socket");
assert(s == 5);
/*
* Make sure that dup'ing a LARVAL file fails with EBUSY.
*
* Otherwise abort the program before calling connect(2),
* this was previously panic'ing the kernel.
*/
if ((dup2(0, 4) != 4) && (errno != EBUSY))
err(1, "dup2");
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(TEST_PORT);
if (connect(5, (struct sockaddr *)&addr, sizeof(addr)) == -1)
err(1, "connect");
return NULL;
}
int
main(void)
{
struct sockaddr_in serv_addr;
struct sockaddr client_addr;
int error, s, len, fd;
pthread_t tr;
if ((error = pthread_create(&tr, NULL, dupper, NULL)))
errc(1, error, "pthread_create");
s = socket(PF_INET, SOCK_STREAM, 0);
if (s == -1)
err(1, "socket");
assert(s == 3);
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
serv_addr.sin_port = htons(TEST_PORT);
if (bind(s, (struct sockaddr *)&serv_addr, sizeof(serv_addr)))
err(1, "bind");
if (listen(s, 3))
err(1, "listen");
len = sizeof(client_addr);
fd = accept(s, &client_addr, &len);
return 0;
}
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