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, ...));
35 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
36 /* Get declarations of the Win32 API functions. */
37 # define WIN32_LEAN_AND_MEAN
41 #include "binary-io.h"
43 /* Use O_CLOEXEC if available, but test works without it. */
49 # define setmode(f,m) zero ()
50 static int zero (void) { return 0; }
53 #define ASSERT(expr) \
58 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
65 /* Return true if FD is open. */
69 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
70 /* On Win32, the initial state of unassigned standard file
71 descriptors is that they are open but point to an
72 INVALID_HANDLE_VALUE, and there is no fcntl. */
73 return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
76 # error Please port fcntl to your platform
78 return 0 <= fcntl (fd, F_GETFL);
82 /* Return true if FD is open and inheritable across exec/spawn. */
84 is_inheritable (int fd)
86 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
87 /* On Win32, the initial state of unassigned standard file
88 descriptors is that they are open but point to an
89 INVALID_HANDLE_VALUE, and there is no fcntl. */
90 HANDLE h = (HANDLE) _get_osfhandle (fd);
92 if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
94 return (flags & HANDLE_FLAG_INHERIT) != 0;
97 # error Please port fcntl to your platform
99 int i = fcntl (fd, F_GETFD);
100 return 0 <= i && (i & FD_CLOEXEC) == 0;
104 /* Return non-zero if FD is open in the given MODE, which is either
105 O_TEXT or O_BINARY. */
107 is_mode (int fd, int mode)
109 int value = setmode (fd, O_BINARY);
111 return mode == value;
114 /* Since native fcntl can have more supported operations than our
115 replacement is aware of, and since various operations assign
116 different types to the vararg argument, a wrapper around fcntl must
117 be able to pass a vararg of unknown type on through to the original
118 fcntl. Make sure that this works properly: func1 behaves like the
119 original fcntl interpreting the vararg as an int or a pointer to a
120 struct, and func2 behaves like rpl_fcntl that doesn't know what
134 i = va_arg (arg, int);
137 struct dummy_struct *s = va_arg (arg, struct dummy_struct *);
149 p = va_arg (arg, void *);
154 /* Ensure that all supported fcntl actions are distinct, and
155 usable in preprocessor expressions. */
165 case F_DUPFD_CLOEXEC:
228 const char *file = "test-fcntl.tmp";
231 /* Sanity check that rpl_fcntl is likely to work. */
232 ASSERT (func2 (1, 2) == 2);
233 ASSERT (func2 (2, -2) == -2);
234 ASSERT (func2 (3, 0x80000000) == 0x80000000);
236 struct dummy_struct s = { 0L, 4 };
237 ASSERT (func2 (4, &s) == 4);
241 /* Assume std descriptors were provided by invoker, and ignore fds
242 that might have been inherited. */
243 fd = creat (file, 0600);
244 ASSERT (STDERR_FILENO < fd);
248 /* For F_DUPFD*, the source must be valid. */
250 ASSERT (fcntl (-1, F_DUPFD, 0) == -1);
251 ASSERT (errno == EBADF);
253 ASSERT (fcntl (fd + 1, F_DUPFD, 0) == -1);
254 ASSERT (errno == EBADF);
256 ASSERT (fcntl (10000000, F_DUPFD, 0) == -1);
257 ASSERT (errno == EBADF);
259 ASSERT (fcntl (-1, F_DUPFD_CLOEXEC, 0) == -1);
260 ASSERT (errno == EBADF);
262 ASSERT (fcntl (fd + 1, F_DUPFD_CLOEXEC, 0) == -1);
263 ASSERT (errno == EBADF);
265 ASSERT (fcntl (10000000, F_DUPFD_CLOEXEC, 0) == -1);
266 ASSERT (errno == EBADF);
268 /* For F_DUPFD*, the destination must be valid. */
269 ASSERT (getdtablesize () < 10000000);
271 ASSERT (fcntl (fd, F_DUPFD, -1) == -1);
272 ASSERT (errno == EINVAL);
274 ASSERT (fcntl (fd, F_DUPFD, 10000000) == -1);
275 ASSERT (errno == EINVAL);
276 ASSERT (getdtablesize () < 10000000);
278 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, -1) == -1);
279 ASSERT (errno == EINVAL);
281 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, 10000000) == -1);
282 ASSERT (errno == EINVAL);
284 /* For F_DUPFD*, check for correct inheritance, as well as
285 preservation of text vs. binary. */
286 setmode (fd, O_BINARY);
287 ASSERT (is_open (fd));
288 ASSERT (!is_open (fd + 1));
289 ASSERT (!is_open (fd + 2));
290 ASSERT (is_inheritable (fd));
291 ASSERT (is_mode (fd, O_BINARY));
293 ASSERT (fcntl (fd, F_DUPFD, fd) == fd + 1);
294 ASSERT (is_open (fd));
295 ASSERT (is_open (fd + 1));
296 ASSERT (!is_open (fd + 2));
297 ASSERT (is_inheritable (fd + 1));
298 ASSERT (is_mode (fd, O_BINARY));
299 ASSERT (is_mode (fd + 1, O_BINARY));
300 ASSERT (close (fd + 1) == 0);
302 ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, fd + 2) == fd + 2);
303 ASSERT (is_open (fd));
304 ASSERT (!is_open (fd + 1));
305 ASSERT (is_open (fd + 2));
306 ASSERT (is_inheritable (fd));
307 ASSERT (!is_inheritable (fd + 2));
308 ASSERT (is_mode (fd, O_BINARY));
309 ASSERT (is_mode (fd + 2, O_BINARY));
310 ASSERT (close (fd) == 0);
312 setmode (fd + 2, O_TEXT);
313 ASSERT (fcntl (fd + 2, F_DUPFD, fd + 1) == fd + 1);
314 ASSERT (!is_open (fd));
315 ASSERT (is_open (fd + 1));
316 ASSERT (is_open (fd + 2));
317 ASSERT (is_inheritable (fd + 1));
318 ASSERT (!is_inheritable (fd + 2));
319 ASSERT (is_mode (fd + 1, O_TEXT));
320 ASSERT (is_mode (fd + 2, O_TEXT));
321 ASSERT (close (fd + 1) == 0);
323 ASSERT (fcntl (fd + 2, F_DUPFD_CLOEXEC, 0) == fd);
324 ASSERT (is_open (fd));
325 ASSERT (!is_open (fd + 1));
326 ASSERT (is_open (fd + 2));
327 ASSERT (!is_inheritable (fd));
328 ASSERT (!is_inheritable (fd + 2));
329 ASSERT (is_mode (fd, O_TEXT));
330 ASSERT (is_mode (fd + 2, O_TEXT));
331 ASSERT (close (fd + 2) == 0);
335 ASSERT (fcntl (-1, F_GETFD) == -1);
336 ASSERT (errno == EBADF);
338 ASSERT (fcntl (fd + 1, F_GETFD) == -1);
339 ASSERT (errno == EBADF);
341 ASSERT (fcntl (10000000, F_GETFD) == -1);
342 ASSERT (errno == EBADF);
344 int result = fcntl (fd, F_GETFD);
345 ASSERT (0 <= result);
346 ASSERT ((result & FD_CLOEXEC) == FD_CLOEXEC);
347 ASSERT (dup (fd) == fd + 1);
348 result = fcntl (fd + 1, F_GETFD);
349 ASSERT (0 <= result);
350 ASSERT ((result & FD_CLOEXEC) == 0);
351 ASSERT (close (fd + 1) == 0);
355 ASSERT (close (fd) == 0);
356 ASSERT (unlink (file) == 0);