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      1 /*	$NetBSD: dislodgefd.c,v 1.1 2023/10/13 18:46:22 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2023 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/socket.h>
     30 #include <sys/un.h>
     31 
     32 #include <pthread.h>
     33 #include <stdio.h>
     34 #include <stdlib.h>
     35 #include <string.h>
     36 #include <unistd.h>
     37 #include <err.h>
     38 
     39 pthread_barrier_t	barrier;
     40 int			fds[2];
     41 
     42 static void *
     43 reader(void *cookie)
     44 {
     45 	char buf[1];
     46 
     47 	(void)pthread_barrier_wait(&barrier);
     48 	printf("reader(): commencing read, this should error out... after 1s\n");
     49 	if (read(fds[0], buf, sizeof(buf)) == -1)
     50 		err(1, "read");
     51 
     52 	printf("reader(): read terminated without error??\n");
     53 	return NULL;
     54 }
     55 
     56 int
     57 main(int argc, char *argv[])
     58 {
     59 	pthread_t pt;
     60 
     61 	if (argc > 1 && strcmp(argv[1], "pipe") == 0) {
     62 		if (pipe(fds))
     63 			err(1, "pipe");
     64 	} else {
     65 		if (socketpair(PF_LOCAL, SOCK_STREAM, 0, fds) < 0)
     66 			err(1, "socketpair");
     67 	}
     68 	pthread_barrier_init(&barrier, NULL, 2);
     69 	if (pthread_create(&pt, NULL, reader, NULL)) {
     70 		errx(1, "pthread_create failed");
     71 	}
     72 	(void)pthread_barrier_wait(&barrier);
     73 	sleep(1);
     74 	printf("main(): closing the reader side fd..\n");
     75 	close(fds[0]);
     76 	printf("main(): sleeping again for a bit..\n");
     77 	sleep(1);
     78 	printf("main(): exiting.\n");
     79 	return 0;
     80 }
     81