2 Copyright (C) 2009 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"
42 /* Use O_CLOEXEC if available, but test works without it. */
48 # define setmode(f,m) zero ()
49 static int zero (void) { return 0; }
52 /* Return true if FD is open. */
56 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
57 /* On Win32, the initial state of unassigned standard file
58 descriptors is that they are open but point to an
59 INVALID_HANDLE_VALUE, and there is no fcntl. */
60 return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
63 # error Please port fcntl to your platform
65 return 0 <= fcntl (fd, F_GETFL);
69 /* Return true if FD is open and inheritable across exec/spawn. */
71 is_inheritable (int fd)
73 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
74 /* On Win32, the initial state of unassigned standard file
75 descriptors is that they are open but point to an
76 INVALID_HANDLE_VALUE, and there is no fcntl. */
77 HANDLE h = (HANDLE) _get_osfhandle (fd);
79 if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
81 return (flags & HANDLE_FLAG_INHERIT) != 0;
84 # error Please port fcntl to your platform
86 int i = fcntl (fd, F_GETFD);
87 return 0 <= i && (i & FD_CLOEXEC) == 0;
91 /* Return non-zero if FD is open in the given MODE, which is either
92 O_TEXT or O_BINARY. */
94 is_mode (int fd, int mode)
96 int value = setmode (fd, O_BINARY);
101 /* Since native fcntl can have more supported operations than our
102 replacement is aware of, and since various operations assign
103 different types to the vararg argument, a wrapper around fcntl must
104 be able to pass a vararg of unknown type on through to the original
105 fcntl. Make sure that this works properly: func1 behaves like the
106 original fcntl interpreting the vararg as an int or a pointer to a
107 struct, and func2 behaves like rpl_fcntl that doesn't know what
121 i = va_arg (arg, int);
124 struct dummy_struct *s = va_arg (arg, struct dummy_struct *);
136 p = va_arg (arg, void *);
141 /* Ensure that all supported fcntl actions are distinct, and
142 usable in preprocessor expressions. */
152 case F_DUPFD_CLOEXEC:
215 const char *file = "test-fcntl.tmp";
218 /* Sanity check that rpl_fcntl is likely to work. */
219 ASSERT (func2 (1, 2) == 2);
220 ASSERT (func2 (2, -2) == -2);
221 ASSERT (func2 (3, 0x80000000) == 0x80000000);
223 struct dummy_struct s = { 0L, 4 };
224 ASSERT (func2 (4, &s) == 4);
228 /* Assume std descriptors were provided by invoker, and ignore fds
229 that might have been inherited. */
230 fd = creat (file, 0600);
231 ASSERT (STDERR_FILENO < fd);
235 /* For F_DUPFD*, the source must be valid. */
237 ASSERT (fcntl (-1, F_DUPFD, 0) == -1);
238 ASSERT (errno == EBADF);
240 ASSERT (fcntl (fd + 1, F_DUPFD, 0) == -1);
241 ASSERT (errno == EBADF);
243 ASSERT (fcntl (10000000, F_DUPFD, 0) == -1);
244 ASSERT (errno == EBADF);
246 ASSERT (fcntl (-1, F_DUPFD_CLOEXEC, 0) == -1);
247 ASSERT (errno == EBADF);
249 ASSERT (fcntl (fd + 1, F_DUPFD_CLOEXEC, 0) == -1);
250 ASSERT (errno == EBADF);
252 ASSERT (fcntl (10000000, F_DUPFD_CLOEXEC, 0) == -1);
253 ASSERT (errno == EBADF);
255 /* For F_DUPFD*, the destination must be valid. */
256 ASSERT (getdtablesize () < 10000000);
258 ASSERT (fcntl (fd, F_DUPFD, -1) == -1);
259 ASSERT (errno == EINVAL);
261 ASSERT (fcntl (fd, F_DUPFD, 10000000) == -1);
262 ASSERT (errno == EINVAL);
263 ASSERT (getdtablesize () < 10000000);
265 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, -1) == -1);
266 ASSERT (errno == EINVAL);
268 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, 10000000) == -1);
269 ASSERT (errno == EINVAL);
271 /* For F_DUPFD*, check for correct inheritance, as well as
272 preservation of text vs. binary. */
273 setmode (fd, O_BINARY);
274 ASSERT (is_open (fd));
275 ASSERT (!is_open (fd + 1));
276 ASSERT (!is_open (fd + 2));
277 ASSERT (is_inheritable (fd));
278 ASSERT (is_mode (fd, O_BINARY));
280 ASSERT (fcntl (fd, F_DUPFD, fd) == fd + 1);
281 ASSERT (is_open (fd));
282 ASSERT (is_open (fd + 1));
283 ASSERT (!is_open (fd + 2));
284 ASSERT (is_inheritable (fd + 1));
285 ASSERT (is_mode (fd, O_BINARY));
286 ASSERT (is_mode (fd + 1, O_BINARY));
287 ASSERT (close (fd + 1) == 0);
289 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, fd + 2) == fd + 2);
290 ASSERT (is_open (fd));
291 ASSERT (!is_open (fd + 1));
292 ASSERT (is_open (fd + 2));
293 ASSERT (is_inheritable (fd));
294 ASSERT (!is_inheritable (fd + 2));
295 ASSERT (is_mode (fd, O_BINARY));
296 ASSERT (is_mode (fd + 2, O_BINARY));
297 ASSERT (close (fd) == 0);
299 setmode (fd + 2, O_TEXT);
300 ASSERT (fcntl (fd + 2, F_DUPFD, fd + 1) == fd + 1);
301 ASSERT (!is_open (fd));
302 ASSERT (is_open (fd + 1));
303 ASSERT (is_open (fd + 2));
304 ASSERT (is_inheritable (fd + 1));
305 ASSERT (!is_inheritable (fd + 2));
306 ASSERT (is_mode (fd + 1, O_TEXT));
307 ASSERT (is_mode (fd + 2, O_TEXT));
308 ASSERT (close (fd + 1) == 0);
310 ASSERT (fcntl (fd + 2, F_DUPFD_CLOEXEC, 0) == fd);
311 ASSERT (is_open (fd));
312 ASSERT (!is_open (fd + 1));
313 ASSERT (is_open (fd + 2));
314 ASSERT (!is_inheritable (fd));
315 ASSERT (!is_inheritable (fd + 2));
316 ASSERT (is_mode (fd, O_TEXT));
317 ASSERT (is_mode (fd + 2, O_TEXT));
318 ASSERT (close (fd + 2) == 0);
322 ASSERT (fcntl (-1, F_GETFD) == -1);
323 ASSERT (errno == EBADF);
325 ASSERT (fcntl (fd + 1, F_GETFD) == -1);
326 ASSERT (errno == EBADF);
328 ASSERT (fcntl (10000000, F_GETFD) == -1);
329 ASSERT (errno == EBADF);
331 int result = fcntl (fd, F_GETFD);
332 ASSERT (0 <= result);
333 ASSERT ((result & FD_CLOEXEC) == FD_CLOEXEC);
334 ASSERT (dup (fd) == fd + 1);
335 result = fcntl (fd + 1, F_GETFD);
336 ASSERT (0 <= result);
337 ASSERT ((result & FD_CLOEXEC) == 0);
338 ASSERT (close (fd + 1) == 0);
342 ASSERT (close (fd) == 0);
343 ASSERT (unlink (file) == 0);