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 26 static 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 36 static 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 47 int 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