1
2 #include <signal.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <unistd.h>
6
7 static struct sigaction oldChildHandlerData;
8
theHandler(int arg)9 void theHandler(int arg)
10 {
11 printf("handled %s\n", arg == SIGCHLD ? "SIGCHLD" : "?!unexpected signal?!" );
12 }
13
setupHandlers()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
main()41 int main()
42 {
43 int i;
44 char buffer[200];
45 size_t dummy_size_t;
46 setupHandlers();
47 FILE *p = popen("echo Hallo World", "r");
48 while (!feof(p)) {
49 int n = fread(buffer, 200, 1, p);
50 dummy_size_t = write(2, buffer, n);
51 }
52 fclose(p);
53 for (i = 0; i < 1000000; i++) ;
54 return 0;
55 }
56