sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1 | |
| 2 | #include <signal.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <unistd.h> |
| 6 | |
| 7 | static struct sigaction oldChildHandlerData; |
| 8 | |
| 9 | void theHandler(int arg) |
| 10 | { |
| 11 | printf("handled %d\n", arg); |
| 12 | } |
| 13 | |
| 14 | void setupHandlers() |
| 15 | { |
| 16 | struct sigaction act; |
| 17 | act.sa_handler=theHandler; |
| 18 | sigemptyset(&(act.sa_mask)); |
| 19 | sigaddset(&(act.sa_mask), SIGCHLD); |
| 20 | // Make sure we don't block this signal. gdb tends to do that :-( |
| 21 | sigprocmask(SIG_UNBLOCK, &(act.sa_mask), 0); |
| 22 | |
| 23 | act.sa_flags = SA_NOCLDSTOP; |
| 24 | |
| 25 | // CC: take care of SunOS which automatically restarts interrupted system |
| 26 | // calls (and thus does not have SA_RESTART) |
| 27 | |
| 28 | #ifdef SA_RESTART |
| 29 | act.sa_flags |= SA_RESTART; |
| 30 | #endif |
| 31 | |
| 32 | sigaction( SIGCHLD, &act, &oldChildHandlerData ); |
| 33 | |
| 34 | act.sa_handler=SIG_IGN; |
| 35 | sigemptyset(&(act.sa_mask)); |
| 36 | sigaddset(&(act.sa_mask), SIGPIPE); |
| 37 | act.sa_flags = 0; |
| 38 | sigaction( SIGPIPE, &act, 0L); |
| 39 | } |
| 40 | |
| 41 | int main() |
| 42 | { |
| 43 | int i; |
| 44 | char buffer[200]; |
| 45 | setupHandlers(); |
| 46 | FILE *p = popen("echo Hallo World", "r"); |
| 47 | while (!feof(p)) { |
| 48 | int n = fread(buffer, 200, 1, p); |
| 49 | write(2, buffer, n); |
| 50 | } |
| 51 | fclose(p); |
| 52 | for (i = 0; i < 1000000; i++) ; |
| 53 | return 0; |
| 54 | } |