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