sewardj | 8eb8bab | 2015-07-21 14:44:28 +0000 | [diff] [blame] | 1 | /* Test whether /proc/{self,$PID}/path/a.out is correctly simulated. */ |
| 2 | |
| 3 | #include <limits.h> |
| 4 | #include <stdio.h> |
| 5 | #include <strings.h> |
| 6 | #include <unistd.h> |
| 7 | #include <sys/fcntl.h> |
| 8 | |
| 9 | static void test_readlink(const char *cwd, const char *label, |
| 10 | const char *path) |
| 11 | { |
| 12 | char buf[PATH_MAX]; |
| 13 | int n; |
| 14 | |
| 15 | if ((n = readlink(path, buf, sizeof(buf) - 1)) >= 0) { |
| 16 | const char *p; |
| 17 | size_t len = strlen(cwd); |
| 18 | |
| 19 | buf[n] = '\0'; |
| 20 | |
| 21 | p = buf; |
| 22 | if (!strncmp(buf, cwd, len)) |
| 23 | p += len; |
| 24 | printf("Result of readlink(\"%s\"): %s\n", label, p); |
| 25 | } |
| 26 | else |
| 27 | perror("readlink"); |
| 28 | } |
| 29 | |
| 30 | static void test_readlinkat(const char *cwd, const char *label, |
| 31 | const char *path) |
| 32 | { |
| 33 | char buf[PATH_MAX]; |
| 34 | int n; |
| 35 | |
| 36 | if ((n = readlinkat(AT_FDCWD, path, buf, sizeof(buf) - 1)) >= 0) { |
| 37 | const char *p; |
| 38 | size_t len = strlen(cwd); |
| 39 | |
| 40 | buf[n] = '\0'; |
| 41 | |
| 42 | p = buf; |
| 43 | if (!strncmp(buf, cwd, len)) |
| 44 | p += len; |
| 45 | printf("Result of readlinkat(\"%s\"): %s\n", label, p); |
| 46 | } |
| 47 | else |
| 48 | perror("readlinkat"); |
| 49 | } |
| 50 | |
| 51 | int main(void) |
| 52 | { |
| 53 | char cwd[PATH_MAX]; |
| 54 | char path[PATH_MAX]; |
| 55 | |
| 56 | cwd[0] = '\0'; |
| 57 | if (!getcwd(cwd, sizeof(cwd) - 1)) /* '-1' to make room for '/' */ |
| 58 | perror("getcwd"); |
| 59 | strcat(cwd, "/"); |
| 60 | |
| 61 | snprintf(path, sizeof(path), "/proc/%ld/path/a.out", (long)getpid()); |
| 62 | |
| 63 | test_readlink(cwd, "/proc/self/path/a.out", "/proc/self/path/a.out"); |
| 64 | test_readlink(cwd, "/proc/<pid>/path/a.out", path); |
| 65 | |
| 66 | test_readlinkat(cwd, "/proc/self/path/a.out", "/proc/self/path/a.out"); |
| 67 | test_readlinkat(cwd, "/proc/<pid>/path/a.out", path); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |