115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) International Business Machines Corp., 2001
|
|
* 07/2001 John George
|
|
*/
|
|
|
|
/*\
|
|
* [Description]
|
|
*
|
|
* Verify that:
|
|
*
|
|
* - truncate(2) truncates a file to a specified length successfully.
|
|
* - If the file is larger than the specified length, the extra data is lost.
|
|
* - If the file is shorter than the specified length, the extra data is filled by '0'.
|
|
* - truncate(2) doesn't change offset.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
|
|
#include "tst_test.h"
|
|
#include "tst_safe_prw.h"
|
|
|
|
#define TESTFILE "testfile"
|
|
#define FILE_SIZE 1024
|
|
#define TRUNC_LEN1 256
|
|
#define TRUNC_LEN2 512
|
|
|
|
static int fd;
|
|
|
|
static struct tcase {
|
|
off_t trunc_len;
|
|
off_t read_off;
|
|
off_t read_count;
|
|
char exp_char;
|
|
} tcases[] = {
|
|
{TRUNC_LEN1, 0, TRUNC_LEN1, 'a'},
|
|
{TRUNC_LEN2, TRUNC_LEN1, TRUNC_LEN1, '\0'},
|
|
};
|
|
|
|
static void verify_truncate(unsigned int n)
|
|
{
|
|
struct tcase *tc = &tcases[n];
|
|
struct stat stat_buf;
|
|
char read_buf[tc->read_count];
|
|
int i;
|
|
|
|
memset(read_buf, 'b', tc->read_count);
|
|
|
|
TEST(truncate(TESTFILE, tc->trunc_len));
|
|
if (TST_RET == -1) {
|
|
tst_res(TFAIL | TTERRNO, "truncate(%s, %ld) failed",
|
|
TESTFILE, tc->trunc_len);
|
|
return;
|
|
}
|
|
|
|
if (TST_RET != 0) {
|
|
tst_res(TFAIL | TTERRNO,
|
|
"truncate(%s, %ld) returned invalid value %ld",
|
|
TESTFILE, tc->trunc_len, TST_RET);
|
|
return;
|
|
}
|
|
|
|
SAFE_STAT(TESTFILE, &stat_buf);
|
|
if (stat_buf.st_size != tc->trunc_len) {
|
|
tst_res(TFAIL, "%s: Incorrect file size %ld, expected %ld",
|
|
TESTFILE, stat_buf.st_size, tc->trunc_len);
|
|
return;
|
|
}
|
|
|
|
if (SAFE_LSEEK(fd, 0, SEEK_CUR)) {
|
|
tst_res(TFAIL, "truncate(%s, %ld) changes offset",
|
|
TESTFILE, tc->trunc_len);
|
|
return;
|
|
}
|
|
|
|
SAFE_PREAD(1, fd, read_buf, tc->read_count, tc->read_off);
|
|
for (i = 0; i < tc->read_count; i++) {
|
|
if (read_buf[i] != tc->exp_char) {
|
|
tst_res(TFAIL, "%s: wrong content %c, expected %c",
|
|
TESTFILE, read_buf[i], tc->exp_char);
|
|
return;
|
|
}
|
|
}
|
|
|
|
tst_res(TPASS, "truncate(%s, %ld) succeeded",
|
|
TESTFILE, tc->trunc_len);
|
|
}
|
|
|
|
static void setup(void)
|
|
{
|
|
fd = SAFE_OPEN(TESTFILE, O_RDWR | O_CREAT, 0644);
|
|
|
|
tst_fill_fd(fd, 'a', FILE_SIZE, 1);
|
|
|
|
SAFE_LSEEK(fd, 0, SEEK_SET);
|
|
}
|
|
|
|
static void cleanup(void)
|
|
{
|
|
if (fd > 0)
|
|
SAFE_CLOSE(fd);
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.needs_tmpdir = 1,
|
|
.setup = setup,
|
|
.cleanup = cleanup,
|
|
.tcnt = ARRAY_SIZE(tcases),
|
|
.test = verify_truncate,
|
|
};
|