1/* Common f{truncate} tests definitions.
2 Copyright (C) 2016-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <unistd.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include <unistd.h>
23
24static void do_prepare (void);
25#define PREPARE(argc, argv) do_prepare ()
26static int do_test (void);
27#define TEST_FUNCTION do_test ()
28
29#include <test-skeleton.c>
30
31static char *temp_filename;
32static int temp_fd;
33
34static void
35do_prepare (void)
36{
37 temp_fd = create_temp_file (base: "tst-trucate.", filename: &temp_filename);
38 if (temp_fd == -1)
39 {
40 printf (format: "cannot create temporary file: %m\n");
41 exit (1);
42 }
43}
44
45#define FAIL(str) \
46 do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
47
48static int
49do_test_with_offset (off_t offset)
50{
51 struct stat st;
52 char buf[1000];
53
54 memset (buf, 0xcf, sizeof (buf));
55
56 if (pwrite (fd: temp_fd, buf: buf, n: sizeof (buf), offset: offset) != sizeof (buf))
57 FAIL ("write failed");
58 if (fstat (fd: temp_fd, buf: &st) < 0 || st.st_size != (offset + sizeof (buf)))
59 FAIL ("initial size wrong");
60
61 if (ftruncate (fd: temp_fd, length: offset + 800) < 0)
62 FAIL ("size reduction with ftruncate failed");
63 if (fstat (fd: temp_fd, buf: &st) < 0 || st.st_size != (offset + 800))
64 FAIL ("size after reduction with ftruncate is incorrect");
65
66 /* The following test covers more than POSIX. POSIX does not require
67 that ftruncate() can increase the file size. But we are testing
68 Unix systems. */
69 if (ftruncate (fd: temp_fd, length: offset + 1200) < 0)
70 FAIL ("size increate with ftruncate failed");
71 if (fstat (fd: temp_fd, buf: &st) < 0 || st.st_size != (offset + 1200))
72 FAIL ("size after increase is incorrect");
73
74 if (truncate (file: temp_filename, length: offset + 800) < 0)
75 FAIL ("size reduction with truncate failed");
76 if (fstat (fd: temp_fd, buf: &st) < 0 || st.st_size != (offset + 800))
77 FAIL ("size after reduction with truncate incorrect");
78
79 /* The following test covers more than POSIX. POSIX does not require
80 that truncate() can increase the file size. But we are testing
81 Unix systems. */
82 if (truncate (file: temp_filename, length: (offset + 1200)) < 0)
83 FAIL ("size increase with truncate failed");
84 if (fstat (fd: temp_fd, buf: &st) < 0 || st.st_size != (offset + 1200))
85 FAIL ("size increase with truncate is incorrect");
86
87 return 0;
88}
89

source code of glibc/posix/tst-truncate-common.c