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Replace signal(2) with sigaction(2) for portability

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It also require defining _POSIX_C_SOURCE constant to 1 (see config.mk).

Depending on wether you only want to rely on C99 standard or POSIX 1.
This commit is contained in:
Simon Lieb 2016-10-22 20:06:23 +02:00 committed by Ivan Tham
parent 22f35d5af4
commit 50ed6952f2
1 changed files with 20 additions and 12 deletions
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32
spt.c
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@ -81,9 +81,9 @@ void
remaining_time(int sigint)
{
char buf[17];
if (signal(SIGUSR1, SIG_IGN) != SIG_IGN)
signal(SIGUSR1, remaining_time);
// FIXME: signal handlers should only do very few things, like
// setting volatile sig_atomic_t
snprintf(buf, 17, "Remaining: %02d:%02d\n",
(timers[i].tmr - timecount) / 60,
(timers[i].tmr - timecount) % 60);
@ -93,9 +93,6 @@ remaining_time(int sigint)
void
toggle(int sigint) {
if (signal(SIGUSR2, SIG_IGN) != SIG_IGN)
signal(SIGUSR2, toggle);
suspend ^= 1;
}
@ -108,8 +105,8 @@ usage(void)
int
main(int argc, char *argv[])
{
sigset_t *emptymask = 0;
suspend = 0;
struct sigaction sa;
sigset_t emptymask;
ARGBEGIN {
case 'e':
@ -126,17 +123,28 @@ main(int argc, char *argv[])
break;
} ARGEND;
if (signal(SIGUSR1, SIG_IGN) != SIG_IGN)
signal(SIGUSR1, remaining_time);
if (signal(SIGUSR2, SIG_IGN) != SIG_IGN)
signal(SIGUSR2, toggle);
/* add SIGUSR1 handler: remaining_time */
sa.sa_handler = remaining_time;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGUSR1, &sa, NULL) == -1)
die("cannot associate SIGUSR1 to handler\n");
/* add SIGUSR2 handler: toggle */
sa.sa_handler = toggle;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGUSR2, &sa, NULL) == -1)
die("cannot associate SIGUSR2 to handler\n");
for (i = 0; ; i = (i + 1) % LEN(timers)) {
notify_send(timers[i].cmt);
timecount = 0;
while (timecount < timers[i].tmr)
if (suspend)
sigsuspend(emptymask);
sigsuspend(&emptymask);
else {
sleep(1);
timecount++;