81 lines
1.7 KiB
C
81 lines
1.7 KiB
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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* Test whether the file offset are the same for both file descriptors.
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*/
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#include <errno.h>
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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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#include "tst_safe_macros.h"
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#define WRITE_STR "abcdefg"
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static int ofd = -1, nfd = 10;
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static struct tcase {
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off_t offset;
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size_t exp_size;
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/* 0 - change offset before dup2, 1 - change offset after dup2 */
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int flag;
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char *exp_data;
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char *desc;
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} tcases[] = {
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{1, 6, 0, "bcdefg", "Test offset with lseek before dup2"},
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{2, 5, 1, "cdefg", "Test offset with lseek after dup2"},
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};
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static void setup(void)
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{
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ofd = SAFE_OPEN("testfile", O_RDWR | O_CREAT, 0644);
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SAFE_WRITE(SAFE_WRITE_ALL, ofd, WRITE_STR, sizeof(WRITE_STR) - 1);
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}
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static void cleanup(void)
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{
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if (ofd > 0)
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SAFE_CLOSE(ofd);
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close(nfd);
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}
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static void run(unsigned int i)
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{
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struct tcase *tc = tcases + i;
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char read_buf[20];
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memset(read_buf, 0, sizeof(read_buf));
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tst_res(TINFO, "%s", tc->desc);
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if (!tc->flag)
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SAFE_LSEEK(ofd, tc->offset, SEEK_SET);
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TEST(dup2(ofd, nfd));
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if (TST_RET == -1) {
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tst_res(TFAIL | TTERRNO, "call failed unexpectedly");
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return;
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}
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if (tc->flag)
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SAFE_LSEEK(ofd, tc->offset, SEEK_SET);
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SAFE_READ(1, nfd, read_buf, tc->exp_size);
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if (strncmp(read_buf, tc->exp_data, tc->exp_size))
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tst_res(TFAIL, "Expect %s, but get %s.", tc->exp_data, read_buf);
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else
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tst_res(TPASS, "Get expected buf %s", read_buf);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.tcnt = ARRAY_SIZE(tcases),
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.test = run,
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.setup = setup,
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.cleanup = cleanup,
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};
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