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