| 1 | #include <stdlib.h> |
| 2 | #include <stdio.h> |
| 3 | #include <unistd.h> |
| 4 | #include <fcntl.h> |
| 5 | #include <sys/ioctl.h> |
| 6 | |
| 7 | void usage(void) |
| 8 | { |
| 9 | fprintf(stderr, "usage: notty PROGRAM [-r] [ARGS...]\n"); |
| 10 | } |
| 11 | |
| 12 | int main(int argc, char **argv) |
| 13 | { |
| 14 | int tty, retain; |
| 15 | int c; |
| 16 | |
| 17 | retain = 0; |
| 18 | while((c = getopt(argc, argv, "r")) >= 0) { |
| 19 | switch(c) { |
| 20 | case 'r': |
| 21 | retain = 1; |
| 22 | break; |
| 23 | case '?': |
| 24 | case ':': |
| 25 | default: |
| 26 | usage(); |
| 27 | exit(1); |
| 28 | } |
| 29 | } |
| 30 | if(argc - optind < 1) { |
| 31 | usage(); |
| 32 | exit(1); |
| 33 | } |
| 34 | if((tty = open("/dev/tty", O_RDWR)) < 0) { |
| 35 | perror("/dev/tty"); |
| 36 | exit(1); |
| 37 | } |
| 38 | if(ioctl(tty, TIOCNOTTY)) { |
| 39 | perror("TIOCNOTTY"); |
| 40 | exit(1); |
| 41 | } |
| 42 | if(retain) { |
| 43 | if(tty != 3) { |
| 44 | dup2(tty, 3); |
| 45 | close(tty); |
| 46 | } |
| 47 | } else { |
| 48 | close(tty); |
| 49 | } |
| 50 | execvp(argv[optind], argv + optind); |
| 51 | perror(argv[optind]); |
| 52 | return(127); |
| 53 | } |