1 #include <stdio.h> 2 #include <unistd.h> 3 #include <sys/types.h> 4 #include <sys/stat.h> 5 #include <fcntl.h> 6 #include <stdlib.h> 7 8 #define BUF_SIZE 256 9 10 int main(int argc, char *argv[]) 11 { 12 int fd = open("/dev/urandom", O_RDONLY); 13 int i; 14 char buf[BUF_SIZE]; 15 int count = 4; 16 17 if (fd < 0) 18 return 1; 19 20 if (argc == 2) 21 count = atoi(argv[1]); 22 23 for (i = 0; i < count; ++i) 24 read(fd, buf, BUF_SIZE); 25 26 close(fd); 27 return 0; 28 } 29
