1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Permission to use, copy, modify, and distribute this software for any
5*4882a593Smuzhiyun * purpose with or without fee is hereby granted, provided that the above
6*4882a593Smuzhiyun * copyright notice and this permission notice appear in all copies.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9*4882a593Smuzhiyun * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10*4882a593Smuzhiyun * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11*4882a593Smuzhiyun * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12*4882a593Smuzhiyun * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13*4882a593Smuzhiyun * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14*4882a593Smuzhiyun * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun /* Test readlink /proc/self/map_files/... */
17*4882a593Smuzhiyun #include <errno.h>
18*4882a593Smuzhiyun #include <sys/types.h>
19*4882a593Smuzhiyun #include <sys/stat.h>
20*4882a593Smuzhiyun #include <fcntl.h>
21*4882a593Smuzhiyun #include <stdio.h>
22*4882a593Smuzhiyun #include <unistd.h>
23*4882a593Smuzhiyun #include <sys/mman.h>
24*4882a593Smuzhiyun #include <stdlib.h>
25*4882a593Smuzhiyun
pass(const char * fmt,unsigned long a,unsigned long b)26*4882a593Smuzhiyun static void pass(const char *fmt, unsigned long a, unsigned long b)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun char name[64];
29*4882a593Smuzhiyun char buf[64];
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun snprintf(name, sizeof(name), fmt, a, b);
32*4882a593Smuzhiyun if (readlink(name, buf, sizeof(buf)) == -1)
33*4882a593Smuzhiyun exit(1);
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
fail(const char * fmt,unsigned long a,unsigned long b)36*4882a593Smuzhiyun static void fail(const char *fmt, unsigned long a, unsigned long b)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun char name[64];
39*4882a593Smuzhiyun char buf[64];
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun snprintf(name, sizeof(name), fmt, a, b);
42*4882a593Smuzhiyun if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
43*4882a593Smuzhiyun return;
44*4882a593Smuzhiyun exit(1);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
main(void)47*4882a593Smuzhiyun int main(void)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
50*4882a593Smuzhiyun void *p;
51*4882a593Smuzhiyun int fd;
52*4882a593Smuzhiyun unsigned long a, b;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun fd = open("/dev/zero", O_RDONLY);
55*4882a593Smuzhiyun if (fd == -1)
56*4882a593Smuzhiyun return 1;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE, fd, 0);
59*4882a593Smuzhiyun if (p == MAP_FAILED)
60*4882a593Smuzhiyun return 1;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun a = (unsigned long)p;
63*4882a593Smuzhiyun b = (unsigned long)p + PAGE_SIZE;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun pass("/proc/self/map_files/%lx-%lx", a, b);
66*4882a593Smuzhiyun fail("/proc/self/map_files/ %lx-%lx", a, b);
67*4882a593Smuzhiyun fail("/proc/self/map_files/%lx -%lx", a, b);
68*4882a593Smuzhiyun fail("/proc/self/map_files/%lx- %lx", a, b);
69*4882a593Smuzhiyun fail("/proc/self/map_files/%lx-%lx ", a, b);
70*4882a593Smuzhiyun fail("/proc/self/map_files/0%lx-%lx", a, b);
71*4882a593Smuzhiyun fail("/proc/self/map_files/%lx-0%lx", a, b);
72*4882a593Smuzhiyun if (sizeof(long) == 4) {
73*4882a593Smuzhiyun fail("/proc/self/map_files/100000000%lx-%lx", a, b);
74*4882a593Smuzhiyun fail("/proc/self/map_files/%lx-100000000%lx", a, b);
75*4882a593Smuzhiyun } else if (sizeof(long) == 8) {
76*4882a593Smuzhiyun fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
77*4882a593Smuzhiyun fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
78*4882a593Smuzhiyun } else
79*4882a593Smuzhiyun return 1;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun return 0;
82*4882a593Smuzhiyun }
83