/*- * Copyright (c) 2010 Jilles Tjoelker * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include <sys/select.h> #include <err.h> #include <stdio.h> #include <unistd.h> /* * Check that pipes can be selected for writing in the reverse direction. */ int main(void) { int pip[2]; fd_set set; int n; if (pipe(pip) == -1) err(1, "FAIL: pipe"); FD_ZERO(&set); FD_SET(pip[0], &set); n = select(pip[1] + 1, NULL, &set, NULL, &(struct timeval){ 0, 0 }); if (n != 1) errx(1, "FAIL: select initial reverse direction"); n = write(pip[0], "x", 1); if (n != 1) err(1, "FAIL: write reverse direction"); FD_ZERO(&set); FD_SET(pip[0], &set); n = select(pip[1] + 1, NULL, &set, NULL, &(struct timeval){ 0, 0 }); if (n != 1) errx(1, "FAIL: select reverse direction after write"); printf("PASS\n"); return (0); } |