/*
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* Copyright © 2020 Alexey Gladkov <gladkov.alexey@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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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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int main(void)
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{
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struct stat proc_st1, proc_st2;
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char procbuff[] = "/tmp/proc.XXXXXX/meminfo";
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char procdir1[] = "/tmp/proc.XXXXXX";
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char procdir2[] = "/tmp/proc.XXXXXX";
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assert(mkdtemp(procdir1) != NULL);
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assert(mkdtemp(procdir2) != NULL);
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assert(!mount("proc", procdir1, "proc", 0, "hidepid=1"));
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assert(!mount("proc", procdir2, "proc", 0, "hidepid=2"));
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snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir1);
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assert(!stat(procbuff, &proc_st1));
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snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir2);
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assert(!stat(procbuff, &proc_st2));
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umount(procdir1);
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umount(procdir2);
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assert(proc_st1.st_dev != proc_st2.st_dev);
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return 0;
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}
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