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source: kBuild/vendor/grep/2.12/gnulib-tests/test-dup-safer.c

Last change on this file was 2595, checked in by bird, 12 years ago

gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)

  • Property svn:eol-style set to native
File size: 4.8 KB
Line 
1/* Test that dup_safer leaves standard fds alone.
2 Copyright (C) 2009-2012 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 <http://www.gnu.org/licenses/>. */
16
17/* Written by Eric Blake <ebb9@byu.net>, 2009. */
18
19#include <config.h>
20
21#include "unistd--.h"
22
23#include <fcntl.h>
24#include <errno.h>
25#include <stdbool.h>
26#include <stdio.h>
27
28#include "binary-io.h"
29#include "cloexec.h"
30
31#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
32/* Get declarations of the native Windows API functions. */
33# define WIN32_LEAN_AND_MEAN
34# include <windows.h>
35/* Get _get_osfhandle. */
36# include "msvc-nothrow.h"
37#endif
38
39#if !O_BINARY
40# define setmode(f,m) zero ()
41static int zero (void) { return 0; }
42#endif
43
44/* This test intentionally closes stderr. So, we arrange to have fd 10
45 (outside the range of interesting fd's during the test) set up to
46 duplicate the original stderr. */
47
48#define BACKUP_STDERR_FILENO 10
49#define ASSERT_STREAM myerr
50#include "macros.h"
51
52static FILE *myerr;
53
54/* Return true if FD is open. */
55static bool
56is_open (int fd)
57{
58#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
59 /* On native Windows, the initial state of unassigned standard file
60 descriptors is that they are open but point to an
61 INVALID_HANDLE_VALUE, and there is no fcntl. */
62 return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
63#else
64# ifndef F_GETFL
65# error Please port fcntl to your platform
66# endif
67 return 0 <= fcntl (fd, F_GETFL);
68#endif
69}
70
71/* Return true if FD is open and inheritable across exec/spawn. */
72static bool
73is_inheritable (int fd)
74{
75#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
76 /* On native Windows, the initial state of unassigned standard file
77 descriptors is that they are open but point to an
78 INVALID_HANDLE_VALUE, and there is no fcntl. */
79 HANDLE h = (HANDLE) _get_osfhandle (fd);
80 DWORD flags;
81 if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
82 return 0;
83 return (flags & HANDLE_FLAG_INHERIT) != 0;
84#else
85# ifndef F_GETFD
86# error Please port fcntl to your platform
87# endif
88 int i = fcntl (fd, F_GETFD);
89 return 0 <= i && (i & FD_CLOEXEC) == 0;
90#endif
91}
92
93/* Return true if FD is open in the given MODE, which is either
94 O_TEXT or O_BINARY. */
95static bool
96is_mode (int fd, int mode)
97{
98 int value = setmode (fd, O_BINARY);
99 setmode (fd, value);
100 return mode == value;
101}
102
103#define witness "test-dup-safer.txt"
104
105int
106main (void)
107{
108 int i;
109 int fd;
110
111 /* We close fd 2 later, so save it in fd 10. */
112 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
113 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
114 return 2;
115
116 /* Create file for later checks. */
117 fd = creat (witness, 0600);
118 ASSERT (STDERR_FILENO < fd);
119
120 /* Four iterations, with progressively more standard descriptors
121 closed. */
122 for (i = -1; i <= STDERR_FILENO; i++)
123 {
124 if (0 <= i)
125 ASSERT (close (i) == 0);
126
127 /* Detect errors. */
128 errno = 0;
129 ASSERT (dup (-1) == -1);
130 ASSERT (errno == EBADF);
131 errno = 0;
132 ASSERT (dup (10000000) == -1);
133 ASSERT (errno == EBADF);
134 close (fd + 1);
135 errno = 0;
136 ASSERT (dup (fd + 1) == -1);
137 ASSERT (errno == EBADF);
138
139 /* Preserve text vs. binary. */
140 setmode (fd, O_BINARY);
141 ASSERT (dup (fd) == fd + 1);
142 ASSERT (is_open (fd + 1));
143 ASSERT (is_inheritable (fd + 1));
144 ASSERT (is_mode (fd + 1, O_BINARY));
145
146 ASSERT (close (fd + 1) == 0);
147 setmode (fd, O_TEXT);
148 ASSERT (dup (fd) == fd + 1);
149 ASSERT (is_open (fd + 1));
150 ASSERT (is_inheritable (fd + 1));
151 ASSERT (is_mode (fd + 1, O_TEXT));
152
153 /* Create cloexec copy. */
154 ASSERT (close (fd + 1) == 0);
155 ASSERT (fd_safer_flag (dup_cloexec (fd), O_CLOEXEC) == fd + 1);
156 ASSERT (set_cloexec_flag (fd + 1, true) == 0);
157 ASSERT (is_open (fd + 1));
158 ASSERT (!is_inheritable (fd + 1));
159 ASSERT (close (fd) == 0);
160
161 /* dup always creates inheritable copies. Also, check that
162 earliest slot past std fds is used. */
163 ASSERT (dup (fd + 1) == fd);
164 ASSERT (is_open (fd));
165 ASSERT (is_inheritable (fd));
166 ASSERT (close (fd + 1) == 0);
167 }
168
169 /* Cleanup. */
170 ASSERT (close (fd) == 0);
171 ASSERT (unlink (witness) == 0);
172
173 return 0;
174}
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