49 lines
954 B
C
49 lines
954 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
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* Author: Yang Xu <xuyang2018.jy@fujitsu.com>
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*/
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/*\
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* [Description]
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*
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* If oldfd is a valid file descriptor, and newfd has the same value as oldfd,
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* then dup2() does nothing, and returns newfd.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include "tst_test.h"
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static int fd = -1;
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static void verify_dup2(void)
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{
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TST_EXP_FD_SILENT(dup2(fd, fd), "dup2(%d, %d)", fd, fd);
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if (TST_RET != fd) {
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tst_res(TFAIL, "dup2(%d, %d) returns wrong newfd(%ld)", fd, fd, TST_RET);
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SAFE_CLOSE(TST_RET);
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return;
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}
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tst_res(TPASS, "dup2(%d, %d) returns newfd(%d)", fd, fd, fd);
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}
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static void setup(void)
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{
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fd = SAFE_OPEN("testfile", O_RDWR | O_CREAT, 0666);
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}
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static void cleanup(void)
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{
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if (fd > -1)
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SAFE_CLOSE(fd);
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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_dup2,
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};
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