1 /* Test of opening a file descriptor.
2 Copyright (C) 2007-2019 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
18
19 /* Make test_open always inline if we're using Fortify, which defines
20 __always_inline to do that. Do nothing otherwise. This works
21 around a glibc bug whereby 'open' cannot be used as a function
22 pointer when _FORTIFY_SOURCE is positive. */
23
24 #if __GLIBC__ && defined __always_inline
25 # define ALWAYS_INLINE __always_inline
26 #else
27 # define ALWAYS_INLINE
28 #endif
29
30 /* This file is designed to test both open(n,buf[,mode]) and
31 openat(AT_FDCWD,n,buf[,mode]). FUNC is the function to test.
32 Assumes that BASE and ASSERT are already defined, and that
33 appropriate headers are already included. If PRINT, warn before
34 skipping symlink tests with status 77. */
35
36 static ALWAYS_INLINE int
test_open(int (* func)(char const *,int,...),bool print)37 test_open (int (*func) (char const *, int, ...), bool print)
38 {
39 int fd;
40 /* Remove anything from prior partial run. */
41 unlink (BASE "file");
42
43 /* Cannot create directory. */
44 errno = 0;
45 ASSERT (func ("nonexist.ent/", O_CREAT | O_RDONLY, 0600) == -1);
46 ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
47 || errno == EINVAL);
48
49 /* Create a regular file. */
50 fd = func (BASE "file", O_CREAT | O_RDONLY, 0600);
51 ASSERT (0 <= fd);
52 ASSERT (close (fd) == 0);
53
54 /* Trailing slash handling. */
55 errno = 0;
56 ASSERT (func (BASE "file/", O_RDONLY) == -1);
57 ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
58
59 /* Directories cannot be opened for writing. */
60 errno = 0;
61 ASSERT (func (".", O_WRONLY) == -1);
62 ASSERT (errno == EISDIR || errno == EACCES);
63
64 /* /dev/null must exist, and be writable. */
65 fd = func ("/dev/null", O_RDONLY);
66 ASSERT (0 <= fd);
67 {
68 char c;
69 ASSERT (read (fd, &c, 1) == 0);
70 }
71 ASSERT (close (fd) == 0);
72 fd = func ("/dev/null", O_WRONLY);
73 ASSERT (0 <= fd);
74 ASSERT (write (fd, "c", 1) == 1);
75 ASSERT (close (fd) == 0);
76
77 /* Although O_NONBLOCK on regular files can be ignored, it must not
78 cause a failure. */
79 fd = func (BASE "file", O_NONBLOCK | O_RDONLY);
80 ASSERT (0 <= fd);
81 ASSERT (close (fd) == 0);
82
83 /* Symlink handling, where supported. */
84 if (symlink (BASE "file", BASE "link") != 0)
85 {
86 ASSERT (unlink (BASE "file") == 0);
87 if (print)
88 fputs ("skipping test: symlinks not supported on this file system\n",
89 stderr);
90 return 77;
91 }
92 errno = 0;
93 ASSERT (func (BASE "link/", O_RDONLY) == -1);
94 ASSERT (errno == ENOTDIR);
95 fd = func (BASE "link", O_RDONLY);
96 ASSERT (0 <= fd);
97 ASSERT (close (fd) == 0);
98
99 /* Cleanup. */
100 ASSERT (unlink (BASE "file") == 0);
101 ASSERT (unlink (BASE "link") == 0);
102
103 return 0;
104 }
105