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 %s\n", arg == SIGCHLD ? "SIGCHLD" : "?!unexpected signal?!" ); 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 __attribute__((unused)) ssize_t nw = write(2, buffer, n); 50 } 51 fclose(p); 52 for (i = 0; i < 1000000; i++) ; 53 return 0; 54 } 55
