tom | aba260b | 2012-03-01 13:42:18 +0000 | [diff] [blame] | 1 | #define _LARGEFILE_SOURCE |
| 2 | #define _LARGEFILE64_SOURCE |
| 3 | |
| 4 | #include <errno.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <sys/resource.h> |
| 9 | #include <unistd.h> |
| 10 | #include "fdleak.h" |
| 11 | |
| 12 | int main(int argc, char **argv) |
| 13 | { |
| 14 | struct rlimit64 oldrlim; |
| 15 | struct rlimit64 newrlim; |
| 16 | int fd; |
| 17 | |
| 18 | CLOSE_INHERITED_FDS; |
| 19 | |
| 20 | if (getrlimit64(RLIMIT_NOFILE, &oldrlim) < 0) |
| 21 | { |
| 22 | perror("getrlimit"); |
| 23 | exit(1); |
| 24 | } |
| 25 | |
| 26 | newrlim.rlim_cur = oldrlim.rlim_max+1; |
| 27 | newrlim.rlim_max = oldrlim.rlim_max; |
| 28 | if (setrlimit64(RLIMIT_NOFILE, &newrlim) == -1) |
| 29 | { |
| 30 | if (errno != EINVAL) { |
| 31 | fprintf(stderr, "setrlimit64 exceeding hardlimit must set errno=EINVAL\n"); |
| 32 | exit(1); |
| 33 | } |
| 34 | } |
| 35 | else |
| 36 | { |
| 37 | fprintf(stderr, "setrlimit64 exceeding hardlimit must return -1\n"); |
| 38 | exit(1); |
| 39 | } |
| 40 | |
| 41 | newrlim.rlim_cur = oldrlim.rlim_max; |
| 42 | newrlim.rlim_max = oldrlim.rlim_max+1; |
| 43 | if (setrlimit64(RLIMIT_NOFILE, &newrlim) == -1) |
| 44 | { |
| 45 | if (errno != EPERM) { |
| 46 | fprintf(stderr, "setrlimit64 changing hardlimit must set errno=EPERM\n"); |
| 47 | exit(1); |
| 48 | } |
| 49 | } |
| 50 | else |
| 51 | { |
| 52 | fprintf(stderr, "setrlimit64 changing hardlimit must return -1\n"); |
| 53 | exit(1); |
| 54 | } |
| 55 | |
| 56 | newrlim.rlim_cur = oldrlim.rlim_cur / 2; |
| 57 | newrlim.rlim_max = oldrlim.rlim_max; |
| 58 | |
| 59 | if (setrlimit64(RLIMIT_NOFILE, &newrlim) < 0) |
| 60 | { |
| 61 | perror("setrlimit64"); |
| 62 | exit(1); |
| 63 | } |
| 64 | |
| 65 | if (getrlimit64(RLIMIT_NOFILE, &newrlim) < 0) |
| 66 | { |
| 67 | perror("getrlimit"); |
| 68 | exit(1); |
| 69 | } |
| 70 | |
| 71 | if (newrlim.rlim_cur != oldrlim.rlim_cur / 2) |
| 72 | { |
| 73 | fprintf(stderr, "rlim_cur is %llu (should be %llu)\n", |
| 74 | (unsigned long long)newrlim.rlim_cur, |
| 75 | (unsigned long long)oldrlim.rlim_cur / 2); |
| 76 | } |
| 77 | |
| 78 | if (newrlim.rlim_max != oldrlim.rlim_max) |
| 79 | { |
| 80 | fprintf(stderr, "rlim_max is %llu (should be %llu)\n", |
| 81 | (unsigned long long)newrlim.rlim_max, |
| 82 | (unsigned long long)oldrlim.rlim_max); |
| 83 | } |
| 84 | |
| 85 | newrlim.rlim_cur -= 3; /* allow for stdin, stdout and stderr */ |
| 86 | |
| 87 | while (newrlim.rlim_cur-- > 0) |
| 88 | { |
| 89 | if (open("/dev/null", O_RDONLY) < 0) |
| 90 | { |
| 91 | perror("open"); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | if ((fd = open("/dev/null", O_RDONLY)) >= 0) |
| 96 | { |
| 97 | fprintf(stderr, "open succeeded with fd %d - it should have failed!\n", fd); |
| 98 | } |
| 99 | else if (errno != EMFILE) |
| 100 | { |
| 101 | perror("open"); |
| 102 | } |
| 103 | |
| 104 | exit(0); |
| 105 | } |