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/* libjodycode: cross-platform alarms
*
* Copyright (C) 2023-2026 by Jody Bruchon <jody@jodybruchon.com>
* Released under The MIT License
*/
#ifdef ON_WINDOWS
#define _WIN32_WINNT 0x0500
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <errno.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef ON_WINDOWS
#include <unistd.h>
#endif
#include "likely_unlikely.h"
#include "libjodycode.h"
int jc_alarm_ring = 0;
#ifdef ON_WINDOWS
static HANDLE hTimer;
#else
static int jc_alarm_repeat = 0;
#endif /* ON_WINDOWS */
#ifdef ON_WINDOWS
void CALLBACK jc_catch_alarm(PVOID arg1, BOOLEAN arg2)
{
(void)arg1; (void)arg2;
jc_alarm_ring++;
return;
}
int jc_start_alarm(const unsigned int seconds, const int repeat)
{
unsigned int secs = seconds * 1000;
unsigned int period = 0;
if (repeat != 0) period = secs;
if (!CreateTimerQueueTimer(&hTimer, NULL, (WAITORTIMERCALLBACK)jc_catch_alarm, 0, secs, period, 0)) {
jc_errno = jc_GetLastError();
return JC_EALARM;
}
jc_alarm_ring++;
return 0;
}
int jc_stop_alarm(void)
{
if (CloseHandle(hTimer) == 0) {
jc_errno = jc_GetLastError();
return JC_EALARM;
}
return 0;
}
#else /* not ON_WINDOWS */
void jc_catch_alarm(const int signum)
{
(void)signum;
jc_alarm_ring++;
if (jc_alarm_repeat != 0) alarm(1);
return;
}
int jc_start_alarm(const unsigned int seconds, const int repeat)
{
struct sigaction sa_run;
memset(&sa_run, 0, sizeof(struct sigaction));
sa_run.sa_handler = jc_catch_alarm;
if (repeat != 0) jc_alarm_repeat = 1;
if (sigaction(SIGALRM, &sa_run, NULL) != 0) {
jc_errno = errno;
return JC_EALARM;
}
alarm(seconds);
return 0;
}
int jc_stop_alarm(void)
{
struct sigaction sa_stop;
alarm(0);
memset(&sa_stop, 0, sizeof(struct sigaction));
sa_stop.sa_handler = SIG_IGN;
jc_alarm_repeat = 0;
if (sigaction(SIGALRM, &sa_stop, NULL) != 0) {
jc_errno = errno;
return JC_EALARM;
}
return 0;
}
#endif /* ON_WINDOWS */
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