michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0: 
michael@0:   A program that reads /dev/random to produce a seed for srand(3).
michael@0: 
michael@0:  */
michael@0: 
michael@0: #include <stdio.h>
michael@0: #include <fcntl.h>
michael@0: 
michael@0: int
michael@0: main(int argc, char *argv[])
michael@0: {
michael@0:     int fd, ok, seed = 0;
michael@0: 
michael@0:     fd = open("/dev/random", O_RDONLY);
michael@0:     if (fd < 0) {
michael@0:         perror("/dev/random");
michael@0:         return 1;
michael@0:     }
michael@0: 
michael@0:     ok = read(fd, &seed, sizeof seed);
michael@0:     if (ok > 0)
michael@0:         printf("%d\n", seed);
michael@0:     else
michael@0:         perror("/dev/random");
michael@0: 
michael@0:     close(fd);
michael@0:     return 0;
michael@0: }