91 lines
1.9 KiB
C
91 lines
1.9 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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* 06/2017 modified by Xiao Yang <yangx.jy@cn.fujitsu.com>
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*/
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/*
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* Description:
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* lseek() succeeds to set the specified offset according to whence
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* and read valid data from this location.
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*/
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "tst_test.h"
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#define WRITE_STR "abcdefg"
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#define TFILE "tfile"
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static int fd;
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static struct tcase {
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off_t off;
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int whence;
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char *wname;
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off_t exp_off;
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ssize_t exp_size;
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char *exp_data;
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} tcases[] = {
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{4, SEEK_SET, "SEEK_SET", 4, 3, "efg"},
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{-2, SEEK_CUR, "SEEK_CUR", 5, 2, "fg"},
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{-4, SEEK_END, "SEEK_END", 3, 4, "defg"},
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{0, SEEK_END, "SEEK_END", 7, 0, NULL},
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};
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static void verify_lseek(unsigned int n)
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{
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char read_buf[64];
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struct tcase *tc = &tcases[n];
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// reset the offset to end of file
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SAFE_READ(0, fd, read_buf, sizeof(read_buf));
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memset(read_buf, 0, sizeof(read_buf));
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TEST(lseek(fd, tc->off, tc->whence));
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if (TST_RET == (off_t) -1) {
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tst_res(TFAIL | TTERRNO, "lseek(%s, %ld, %s) failed", TFILE,
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tc->off, tc->wname);
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return;
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}
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if (TST_RET != tc->exp_off) {
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tst_res(TFAIL, "lseek(%s, %ld, %s) returned %ld, expected %ld",
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TFILE, tc->off, tc->wname, TST_RET, tc->exp_off);
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return;
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}
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SAFE_READ(1, fd, read_buf, tc->exp_size);
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if (tc->exp_data && strcmp(read_buf, tc->exp_data)) {
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tst_res(TFAIL, "lseek(%s, %ld, %s) read incorrect data",
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TFILE, tc->off, tc->wname);
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} else {
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tst_res(TPASS, "lseek(%s, %ld, %s) read correct data",
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TFILE, tc->off, tc->wname);
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}
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}
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static void setup(void)
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{
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fd = SAFE_OPEN(TFILE, O_RDWR | O_CREAT, 0644);
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SAFE_WRITE(1, fd, 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 (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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.setup = setup,
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.cleanup = cleanup,
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.tcnt = ARRAY_SIZE(tcases),
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.test = verify_lseek,
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.needs_tmpdir = 1,
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};
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