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comparison: tools/reorder/rseed.c
tools/reorder/rseed.c
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:f1f2e6c49f35 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 /* | |
| 6 | |
| 7 A program that reads /dev/random to produce a seed for srand(3). | |
| 8 | |
| 9 */ | |
| 10 | |
| 11 #include <stdio.h> | |
| 12 #include <fcntl.h> | |
| 13 | |
| 14 int | |
| 15 main(int argc, char *argv[]) | |
| 16 { | |
| 17 int fd, ok, seed = 0; | |
| 18 | |
| 19 fd = open("/dev/random", O_RDONLY); | |
| 20 if (fd < 0) { | |
| 21 perror("/dev/random"); | |
| 22 return 1; | |
| 23 } | |
| 24 | |
| 25 ok = read(fd, &seed, sizeof seed); | |
| 26 if (ok > 0) | |
| 27 printf("%d\n", seed); | |
| 28 else | |
| 29 perror("/dev/random"); | |
| 30 | |
| 31 close(fd); | |
| 32 return 0; | |
| 33 } |
