/*
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* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// Test that open(/proc/*/fd/*) opens the same file.
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#undef NDEBUG
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#include <assert.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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int main(void)
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{
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int fd0, fd1, fd2;
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struct stat st0, st1, st2;
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char buf[64];
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int rv;
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fd0 = open("/", O_DIRECTORY|O_RDONLY);
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assert(fd0 >= 0);
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snprintf(buf, sizeof(buf), "/proc/self/fd/%u", fd0);
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fd1 = open(buf, O_RDONLY);
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assert(fd1 >= 0);
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snprintf(buf, sizeof(buf), "/proc/thread-self/fd/%u", fd0);
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fd2 = open(buf, O_RDONLY);
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assert(fd2 >= 0);
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rv = fstat(fd0, &st0);
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assert(rv == 0);
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rv = fstat(fd1, &st1);
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assert(rv == 0);
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rv = fstat(fd2, &st2);
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assert(rv == 0);
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assert(st0.st_dev == st1.st_dev);
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assert(st0.st_ino == st1.st_ino);
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assert(st0.st_dev == st2.st_dev);
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assert(st0.st_ino == st2.st_ino);
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return 0;
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}
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