LXR linux/tools/testing/selftests/proc/proc-self-map-files-001.c

   1/*
   2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
   3 *
   4 * Permission to use, copy, modify, and distribute this software for any
   5 * purpose with or without fee is hereby granted, provided that the above
   6 * copyright notice and this permission notice appear in all copies.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 */
  16/* Test readlink /proc/self/map_files/... */
  17#include <errno.h>
  18#include <sys/types.h>
  19#include <sys/stat.h>
  20#include <fcntl.h>
  21#include <stdio.h>
  22#include <unistd.h>
  23#include <sys/mman.h>
  24#include <stdlib.h>
  25
  26static void pass(const char *fmt, unsigned long a, unsigned long b)
  27{
  28        char name[64];
  29        char buf[64];
  30
  31        snprintf(name, sizeof(name), fmt, a, b);
  32        if (readlink(name, buf, sizeof(buf)) == -1)
  33                exit(1);
  34}
  35
  36static void fail(const char *fmt, unsigned long a, unsigned long b)
  37{
  38        char name[64];
  39        char buf[64];
  40
  41        snprintf(name, sizeof(name), fmt, a, b);
  42        if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
  43                return;
  44        exit(1);
  45}
  46
  47int main(void)
  48{
  49        const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
  50        void *p;
  51        int fd;
  52        unsigned long a, b;
  53
  54        fd = open("/dev/zero", O_RDONLY);
  55        if (fd == -1)
  56                return 1;
  57
  58        p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE, fd, 0);
  59        if (p == MAP_FAILED)
  60                return 1;
  61
  62        a = (unsigned long)p;
  63        b = (unsigned long)p + PAGE_SIZE;
  64
  65        pass("/proc/self/map_files/%lx-%lx", a, b);
  66        fail("/proc/self/map_files/ %lx-%lx", a, b);
  67        fail("/proc/self/map_files/%lx -%lx", a, b);
  68        fail("/proc/self/map_files/%lx- %lx", a, b);
  69        fail("/proc/self/map_files/%lx-%lx ", a, b);
  70        fail("/proc/self/map_files/0%lx-%lx", a, b);
  71        fail("/proc/self/map_files/%lx-0%lx", a, b);
  72        if (sizeof(long) == 4) {
  73                fail("/proc/self/map_files/100000000%lx-%lx", a, b);
  74                fail("/proc/self/map_files/%lx-100000000%lx", a, b);
  75        } else if (sizeof(long) == 8) {
  76                fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
  77                fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
  78        } else
  79                return 1;
  80
  81        return 0;
  82}
  83