57 lines
1.0 KiB
C
57 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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*/
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/*\
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* [Description]
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*
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* Testcase to check if read() successfully sets errno to EAGAIN when read from
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* a pipe (fifo, opened in O_NONBLOCK mode) without writing to it.
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include "tst_test.h"
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static char fifo[100];
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static int rfd, wfd;
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static void verify_read(void)
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{
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int c;
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TST_EXP_FAIL(read(rfd, &c, 1), EAGAIN,
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"read() when nothing is written to a pipe");
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}
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static void setup(void)
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{
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struct stat buf;
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sprintf(fifo, "fifo.%d", getpid());
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SAFE_MKNOD(fifo, S_IFIFO | 0777, 0);
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SAFE_STAT(fifo, &buf);
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if ((buf.st_mode & S_IFIFO) == 0)
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tst_brk(TBROK, "Mode does not indicate fifo file");
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rfd = SAFE_OPEN(fifo, O_RDONLY | O_NONBLOCK);
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wfd = SAFE_OPEN(fifo, O_WRONLY | O_NONBLOCK);
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}
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static void cleanup(void)
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{
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SAFE_CLOSE(rfd);
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SAFE_CLOSE(wfd);
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SAFE_UNLINK(fifo);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_read,
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};
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