2 Copyright (C) 2009-2011 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
24 #include "signature.h"
25 SIGNATURE_CHECK (fcntl, int, (int, int, ...));
33 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
34 /* Get declarations of the Win32 API functions. */
35 # define WIN32_LEAN_AND_MEAN
39 #include "binary-io.h"
43 # define setmode(f,m) zero ()
44 static int zero (void) { return 0; }
47 /* Return true if FD is open. */
51 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
52 /* On Win32, the initial state of unassigned standard file
53 descriptors is that they are open but point to an
54 INVALID_HANDLE_VALUE, and there is no fcntl. */
55 return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
58 # error Please port fcntl to your platform
60 return 0 <= fcntl (fd, F_GETFL);
64 /* Return true if FD is open and inheritable across exec/spawn. */
66 is_inheritable (int fd)
68 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
69 /* On Win32, the initial state of unassigned standard file
70 descriptors is that they are open but point to an
71 INVALID_HANDLE_VALUE, and there is no fcntl. */
72 HANDLE h = (HANDLE) _get_osfhandle (fd);
74 if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
76 return (flags & HANDLE_FLAG_INHERIT) != 0;
79 # error Please port fcntl to your platform
81 int i = fcntl (fd, F_GETFD);
82 return 0 <= i && (i & FD_CLOEXEC) == 0;
86 /* Return non-zero if FD is open in the given MODE, which is either
87 O_TEXT or O_BINARY. */
89 is_mode (int fd, int mode)
91 int value = setmode (fd, O_BINARY);
96 /* Since native fcntl can have more supported operations than our
97 replacement is aware of, and since various operations assign
98 different types to the vararg argument, a wrapper around fcntl must
99 be able to pass a vararg of unknown type on through to the original
100 fcntl. Make sure that this works properly: func1 behaves like the
101 original fcntl interpreting the vararg as an int or a pointer to a
102 struct, and func2 behaves like rpl_fcntl that doesn't know what
116 i = va_arg (arg, int);
119 struct dummy_struct *s = va_arg (arg, struct dummy_struct *);
131 p = va_arg (arg, void *);
136 /* Ensure that all supported fcntl actions are distinct, and
137 usable in preprocessor expressions. */
147 case F_DUPFD_CLOEXEC:
210 const char *file = "test-fcntl.tmp";
213 /* Sanity check that rpl_fcntl is likely to work. */
214 ASSERT (func2 (1, 2) == 2);
215 ASSERT (func2 (2, -2) == -2);
216 ASSERT (func2 (3, 0x80000000) == 0x80000000);
218 struct dummy_struct s = { 0L, 4 };
219 ASSERT (func2 (4, &s) == 4);
223 /* Assume std descriptors were provided by invoker, and ignore fds
224 that might have been inherited. */
225 fd = creat (file, 0600);
226 ASSERT (STDERR_FILENO < fd);
230 /* For F_DUPFD*, the source must be valid. */
232 ASSERT (fcntl (-1, F_DUPFD, 0) == -1);
233 ASSERT (errno == EBADF);
235 ASSERT (fcntl (fd + 1, F_DUPFD, 0) == -1);
236 ASSERT (errno == EBADF);
238 ASSERT (fcntl (10000000, F_DUPFD, 0) == -1);
239 ASSERT (errno == EBADF);
241 ASSERT (fcntl (-1, F_DUPFD_CLOEXEC, 0) == -1);
242 ASSERT (errno == EBADF);
244 ASSERT (fcntl (fd + 1, F_DUPFD_CLOEXEC, 0) == -1);
245 ASSERT (errno == EBADF);
247 ASSERT (fcntl (10000000, F_DUPFD_CLOEXEC, 0) == -1);
248 ASSERT (errno == EBADF);
250 /* For F_DUPFD*, the destination must be valid. */
251 ASSERT (getdtablesize () < 10000000);
253 ASSERT (fcntl (fd, F_DUPFD, -1) == -1);
254 ASSERT (errno == EINVAL);
256 ASSERT (fcntl (fd, F_DUPFD, 10000000) == -1);
257 ASSERT (errno == EINVAL);
258 ASSERT (getdtablesize () < 10000000);
260 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, -1) == -1);
261 ASSERT (errno == EINVAL);
263 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, 10000000) == -1);
264 ASSERT (errno == EINVAL);
266 /* For F_DUPFD*, check for correct inheritance, as well as
267 preservation of text vs. binary. */
268 setmode (fd, O_BINARY);
269 ASSERT (is_open (fd));
270 ASSERT (!is_open (fd + 1));
271 ASSERT (!is_open (fd + 2));
272 ASSERT (is_inheritable (fd));
273 ASSERT (is_mode (fd, O_BINARY));
275 ASSERT (fcntl (fd, F_DUPFD, fd) == fd + 1);
276 ASSERT (is_open (fd));
277 ASSERT (is_open (fd + 1));
278 ASSERT (!is_open (fd + 2));
279 ASSERT (is_inheritable (fd + 1));
280 ASSERT (is_mode (fd, O_BINARY));
281 ASSERT (is_mode (fd + 1, O_BINARY));
282 ASSERT (close (fd + 1) == 0);
284 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, fd + 2) == fd + 2);
285 ASSERT (is_open (fd));
286 ASSERT (!is_open (fd + 1));
287 ASSERT (is_open (fd + 2));
288 ASSERT (is_inheritable (fd));
289 ASSERT (!is_inheritable (fd + 2));
290 ASSERT (is_mode (fd, O_BINARY));
291 ASSERT (is_mode (fd + 2, O_BINARY));
292 ASSERT (close (fd) == 0);
294 setmode (fd + 2, O_TEXT);
295 ASSERT (fcntl (fd + 2, F_DUPFD, fd + 1) == fd + 1);
296 ASSERT (!is_open (fd));
297 ASSERT (is_open (fd + 1));
298 ASSERT (is_open (fd + 2));
299 ASSERT (is_inheritable (fd + 1));
300 ASSERT (!is_inheritable (fd + 2));
301 ASSERT (is_mode (fd + 1, O_TEXT));
302 ASSERT (is_mode (fd + 2, O_TEXT));
303 ASSERT (close (fd + 1) == 0);
305 ASSERT (fcntl (fd + 2, F_DUPFD_CLOEXEC, 0) == fd);
306 ASSERT (is_open (fd));
307 ASSERT (!is_open (fd + 1));
308 ASSERT (is_open (fd + 2));
309 ASSERT (!is_inheritable (fd));
310 ASSERT (!is_inheritable (fd + 2));
311 ASSERT (is_mode (fd, O_TEXT));
312 ASSERT (is_mode (fd + 2, O_TEXT));
313 ASSERT (close (fd + 2) == 0);
317 ASSERT (fcntl (-1, F_GETFD) == -1);
318 ASSERT (errno == EBADF);
320 ASSERT (fcntl (fd + 1, F_GETFD) == -1);
321 ASSERT (errno == EBADF);
323 ASSERT (fcntl (10000000, F_GETFD) == -1);
324 ASSERT (errno == EBADF);
326 int result = fcntl (fd, F_GETFD);
327 ASSERT (0 <= result);
328 ASSERT ((result & FD_CLOEXEC) == FD_CLOEXEC);
329 ASSERT (dup (fd) == fd + 1);
330 result = fcntl (fd + 1, F_GETFD);
331 ASSERT (0 <= result);
332 ASSERT ((result & FD_CLOEXEC) == 0);
333 ASSERT (close (fd + 1) == 0);
337 ASSERT (close (fd) == 0);
338 ASSERT (unlink (file) == 0);