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0f8bcdfd92
If the system has configured a lower limit (either soft or hard) on the number of open file descriptors, the test will fail. Make sure to check whether we have exceeded that limit and adapt the max number of file descriptors appropriately.
64 lines
2.0 KiB
C
64 lines
2.0 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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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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assert(fcntl(i, F_GETFL) == -1 && errno == EBADF);
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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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