73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
// 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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* 07/2001 Ported by Wayne Boyer
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* 07/2002 Limited forking and split "infinite forks" testcase to fork12.c by
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* Nate Straz
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* Copyright (c) 2021 Xie Ziyao <xieziyao@huawei.com>
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*/
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/*\
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* [Description]
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*
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* Check that all children inherit parent's file descriptor.
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*
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* Parent opens a file and forks children. Each child reads a byte and checks
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* that the value is correct. Parent checks that correct number of bytes was
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* consumed from the file.
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*/
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#include <stdlib.h>
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#include "tst_test.h"
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#define NFORKS 100
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#define TESTFILE "testfile_fork07"
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static int fd;
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static char buf;
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static void run(void)
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{
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int ret, i;
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fd = SAFE_OPEN(TESTFILE, O_RDONLY);
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for (i = 0; i < NFORKS; ++i) {
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if (!SAFE_FORK()) {
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SAFE_READ(1, fd, &buf, 1);
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if (buf != 'a')
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tst_res(TFAIL, "%6d: read '%c' instead of 'a'",
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getpid(), buf);
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exit(0);
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}
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}
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tst_reap_children();
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ret = read(fd, &buf, 1);
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if (ret == 0)
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tst_res(TPASS, "read the end of file correctly");
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else
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tst_res(TFAIL, "read() returns %d, expected 0", ret);
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SAFE_CLOSE(fd);
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}
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static void setup(void)
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{
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tst_fill_file(TESTFILE, 'a', NFORKS, 1);
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}
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static void cleanup(void)
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{
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if (fd > 0)
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SAFE_CLOSE(fd);
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}
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static struct tst_test test = {
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.forks_child = 1,
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.needs_tmpdir = 1,
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.cleanup = cleanup,
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.setup = setup,
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.test_all = run,
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};
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