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OSCL-LXR

 
 

    


0001 /*
0002  * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
0003  *
0004  * Permission to use, copy, modify, and distribute this software for any
0005  * purpose with or without fee is hereby granted, provided that the above
0006  * copyright notice and this permission notice appear in all copies.
0007  *
0008  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
0009  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
0010  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
0011  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
0012  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
0013  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
0014  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0015  */
0016 /* Test readlink /proc/self/map_files/... */
0017 #include <errno.h>
0018 #include <sys/types.h>
0019 #include <sys/stat.h>
0020 #include <fcntl.h>
0021 #include <stdio.h>
0022 #include <unistd.h>
0023 #include <sys/mman.h>
0024 #include <stdlib.h>
0025 
0026 static void pass(const char *fmt, unsigned long a, unsigned long b)
0027 {
0028     char name[64];
0029     char buf[64];
0030 
0031     snprintf(name, sizeof(name), fmt, a, b);
0032     if (readlink(name, buf, sizeof(buf)) == -1)
0033         exit(1);
0034 }
0035 
0036 static void fail(const char *fmt, unsigned long a, unsigned long b)
0037 {
0038     char name[64];
0039     char buf[64];
0040 
0041     snprintf(name, sizeof(name), fmt, a, b);
0042     if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
0043         return;
0044     exit(1);
0045 }
0046 
0047 int main(void)
0048 {
0049     const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
0050     void *p;
0051     int fd;
0052     unsigned long a, b;
0053 
0054     fd = open("/dev/zero", O_RDONLY);
0055     if (fd == -1)
0056         return 1;
0057 
0058     p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE, fd, 0);
0059     if (p == MAP_FAILED)
0060         return 1;
0061 
0062     a = (unsigned long)p;
0063     b = (unsigned long)p + PAGE_SIZE;
0064 
0065     pass("/proc/self/map_files/%lx-%lx", a, b);
0066     fail("/proc/self/map_files/ %lx-%lx", a, b);
0067     fail("/proc/self/map_files/%lx -%lx", a, b);
0068     fail("/proc/self/map_files/%lx- %lx", a, b);
0069     fail("/proc/self/map_files/%lx-%lx ", a, b);
0070     fail("/proc/self/map_files/0%lx-%lx", a, b);
0071     fail("/proc/self/map_files/%lx-0%lx", a, b);
0072     if (sizeof(long) == 4) {
0073         fail("/proc/self/map_files/100000000%lx-%lx", a, b);
0074         fail("/proc/self/map_files/%lx-100000000%lx", a, b);
0075     } else if (sizeof(long) == 8) {
0076         fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
0077         fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
0078     } else
0079         return 1;
0080 
0081     return 0;
0082 }