Hello Sebastian,
Sebastian Kienzl wrote:
> Hello!
>
> There's a bug in the select_tut man-page in the chapter "Combining
> Signal and Data Events", which should illustrate pselect()-usage.
>
> See the attachments for detailed information, proof-code and a proposed
> fix.
>
> Regards,
> Seb.
What do you think of the revised (but still incomplete)
program below?
Cheers,
Michael
static volatile sig_atomic_t got_SIGCHILD = 0;
void
child_sig_handler(int sig)
{
got_SIGCHILD = 1;
}
int
main(int argc, char *argv[])
{
sigset_t sigmask, empty_mask;
struct sigaction sa;
fd_set readfs, writefds, exceptfds;
int r;
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGCHLD);
if (sigprocmask(SIG_BLOCK, &sigmask, NULL) == -1) {
perror("sigprocmask");
exit(EXIT_FAILURE);
}
sa.sa_flags = 0;
sa.sa_handler = child_sig_handler;
sigemptyset(&sa.sa_mask);
if (sigaction(SIGCHILD, &sa, NULL) == -1) {
perror("sigaction");
exit(EXIT_FAILURE);
}
sigemptyset(empty_mask);
for (;;) { /* main loop */
/* Initialize readfds, writefds, and exceptfds
before the pselect() call. (Code omitted.) */
r = pselect(nfds, &readfs, &writefds, &exceptfd,
0, &empty_mask);
if (r == -1 && errno != EINTR) {
/* Handle error */
}
if (got_SIGCHILD) {
got_SIGCHILD = 0;
/* Handle signalled event here; e.g., wait() for all
terminated children. (Code omitted.) */
}
/* main body of program */
}
}
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