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dd0bdb58e0
On macOS, closefrom() only sets the close-on-exec flag, so we cannot check whether all file descriptors were closed, which means that if on entry our file descriptor table was filled after the 4th file descriptor, then we might fail the assertions for the flags for odd file descriptors which we expect to be closed. This can easily happen when running the test suite in parallel mode with «make -j8 check» for example. Closes: #23
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
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* Copyright © 2015 Guillem Jover <guillem@hadrons.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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int
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main(int argc, char *argv[])
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{
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int i;
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int fd;
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int fd_max;
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fd = open("/dev/null", O_RDONLY);
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fd_max = 1024;
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/* First make sure we have a clean fd list. */
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for (i = 4; i < fd_max; i++)
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close(i);
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/* Then initialize each even fd. */
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for (i = 4; i < fd_max; i *= 2) {
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int fd_new = dup2(fd, i);
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if (fd_new < 0 && (errno == EMFILE || errno == EBADF)) {
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fd_max = i - 1;
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break;
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}
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assert(fd_new == i);
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}
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if (fd < 4)
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close(fd);
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closefrom(4);
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for (i = 4; i < fd_max; i++) {
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int rc;
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errno = 0;
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rc = fcntl(i, F_GETFD);
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#ifdef __APPLE__
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/* On macOS we only set close-on-exec. */
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if ((i & (i - 1)) == 0)
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assert(rc == FD_CLOEXEC);
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else
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assert(rc == -1 && errno == EBADF);
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#else
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assert(rc == -1 && errno == EBADF);
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#endif
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}
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assert(fcntl(fd, F_GETFL) == -1 && errno == EBADF);
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return 0;
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}
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