1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
5 * Author: Wayne Boyer
6 */
7 /*
8 * Test Description:
9 * Verify that, ftruncate() succeeds to truncate a file to a certain length,
10 * if the file previously is smaller than the truncated size, ftruncate()
11 * shall increase the size of the file.
12 */
13
14 #include <sys/types.h>
15 #include <sys/stat.h>
16 #include <unistd.h>
17 #include <fcntl.h>
18 #include <errno.h>
19 #include <string.h>
20
21 #include "tst_test.h"
22
23 #define TESTFILE "testfile"
24
25 #define TRUNC_LEN1 256
26 #define TRUNC_LEN2 512
27 #define FILE_SIZE 1024
28
29 static int fd;
30
check_and_report(off_t offset,char data,off_t trunc_len)31 static void check_and_report(off_t offset, char data, off_t trunc_len)
32 {
33 int i, file_length;
34 char buf[FILE_SIZE];
35 struct stat stat_buf;
36
37 memset(buf, '*', sizeof(buf));
38
39 SAFE_FSTAT(fd, &stat_buf);
40 file_length = stat_buf.st_size;
41
42 if (file_length != trunc_len) {
43 tst_res(TFAIL, "ftruncate() got incorrected size: %d",
44 file_length);
45 return;
46 }
47
48 SAFE_LSEEK(fd, offset, SEEK_SET);
49 SAFE_READ(0, fd, buf, sizeof(buf));
50
51 for (i = 0; i < TRUNC_LEN1; i++) {
52 if (buf[i] != data) {
53 tst_res(TFAIL,
54 "ftruncate() got incorrect data %i, expected %i",
55 buf[i], data);
56 return;
57 }
58 }
59
60 tst_res(TPASS, "ftruncate() succeeded");
61 }
62
verify_ftruncate(void)63 static void verify_ftruncate(void)
64 {
65 tst_res(TINFO, "Truncated length smaller than file size");
66 TEST(ftruncate(fd, TRUNC_LEN1));
67 if (TST_RET == -1) {
68 tst_res(TFAIL | TTERRNO, "ftruncate() failed");
69 return;
70 }
71
72 check_and_report(0, 'a', TRUNC_LEN1);
73
74 tst_res(TINFO, "Truncated length exceeds file size");
75 TEST(ftruncate(fd, TRUNC_LEN2));
76 if (TST_RET == -1) {
77 tst_res(TFAIL | TTERRNO, "ftruncate() failed");
78 return;
79 }
80
81 check_and_report(TRUNC_LEN1, 0, TRUNC_LEN2);
82 }
83
setup(void)84 static void setup(void)
85 {
86 if (tst_fill_file(TESTFILE, 'a', FILE_SIZE, 1))
87 tst_brk(TBROK, "Failed to create test file");
88
89 fd = SAFE_OPEN(TESTFILE, O_RDWR);
90 }
91
cleanup(void)92 static void cleanup(void)
93 {
94 if (fd > 0)
95 SAFE_CLOSE(fd);
96 }
97
98 static struct tst_test test = {
99 .test_all = verify_ftruncate,
100 .setup = setup,
101 .cleanup = cleanup,
102 .needs_tmpdir = 1,
103 };
104