From 44395654d8691c800abf0421f4b8270ace288529 Mon Sep 17 00:00:00 2001
From: Simon Lieb <simon@e5150.fr>
Date: Tue, 25 Oct 2016 20:54:16 +0200
Subject: [PATCH] Fix signal bursts blocking the counter

As sleep() would only detect a minimum of 1 second of sleeping, using
nanosleep() solves this problem. But we now required to define
POSIX_C_SOURCE >= 199309
---
 config.mk |  2 +-
 spt.c     | 18 ++++++++++--------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/config.mk b/config.mk
index 0c96010..0371286 100644
--- a/config.mk
+++ b/config.mk
@@ -16,7 +16,7 @@ INCS+= `pkg-config --cflags libnotify`
 LIBS+= `pkg-config --libs libnotify`
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\" -D_POSIX_C_SOURCE
+CPPFLAGS = -DVERSION=\"${VERSION}\" -D_POSIX_C_SOURCE=199309
 CFLAGS += -g -std=c99 -pedantic -Wall -Os ${INCS} ${DEFS} ${CPPFLAGS}
 LDFLAGS += -g ${LIBS}
 
diff --git a/spt.c b/spt.c
index dfe2728..15b83f1 100644
--- a/spt.c
+++ b/spt.c
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <signal.h>
+#include <time.h>
 #ifdef NOTIFY
 #include <libnotify/notify.h>
 #endif /* NOTIFY */
@@ -112,9 +113,10 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
+	struct timespec remaining;
 	struct sigaction sa;
 	sigset_t emptymask;
-	int i, timecount;
+	int i;
 
 	ARGBEGIN {
 		case 'e':
@@ -149,17 +151,17 @@ main(int argc, char *argv[])
 
 	for (i = 0; ; i = (i + 1) % LEN(timers)) {
 		notify_send(timers[i].cmt);
-		timecount = 0;
-		while (timecount < timers[i].tmr) {
+		remaining.tv_sec = timers[i].tmr;
+		remaining.tv_nsec = 0;
+		while (remaining.tv_sec) {
 			if (display)
-				display_time(timecount);
+				display_time(remaining.tv_sec);
 
 			if (suspend)
 				sigsuspend(&emptymask);
-			else {
-				sleep(1);
-				timecount++;
-			}
+			else
+				if (nanosleep(&remaining, &remaining) == 0)
+					remaining.tv_sec = remaining.tv_nsec = 0;
 		}
 	}