functional programming ftw

1 files changed, 47 insertions, 31 deletions

diff --git a/src/main.c b/src/main.c
index d66f483..70424d3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -71,60 +71,52 @@ void backlight_on(void) {
 	usleep(BACKLIGHT_TIME);
 }
 
-void light_thread(void) {
-	// check last_press vs time, do the thing
-	backlight_fp = fopen(BACKLIGHT_FILE, "w");
-
-//	FILE* backlight_fp = BACKLIGHT_FILE;
-
+uint64_t time_since_press(void) {
 	struct timeval now;
 
 	uint64_t now_usec;
 	uint64_t press_usec;
 	uint64_t diff;
 
-	while (1) {
-		gettimeofday(&now, NULL);
+	gettimeofday(&now, NULL);
 
-		now_usec = now.tv_sec * 1000000L;
-		now_usec += now.tv_usec;
+	now_usec = now.tv_sec * 1000000L;
+	now_usec += now.tv_usec;
 
-		press_usec = last_press->tv_sec * 1000000L;
-		press_usec += last_press->tv_usec;
+	press_usec = last_press->tv_sec * 1000000L;
+	press_usec += last_press->tv_usec;
 
-		diff = now_usec - press_usec;
+	diff = now_usec - press_usec;
 
-		if (diff > BACKLIGHT_TIME)	backlight_off();
-		else						backlight_on();
-
-		usleep(THREAD_WAIT);
-
-		fflush(stdout);
-	}
+	return diff;
 }
 
 void on_press(void) {
 	gettimeofday(last_press, NULL);
 }
 
-void daemonize(void) {
-	daemon(0, 0);
+int light_thread(void) {
+	// check last_press vs time, do the thing
+	backlight_fp = fopen(BACKLIGHT_FILE, "w");
+
+//	FILE* backlight_fp = BACKLIGHT_FILE;
+
+	while (1) {
+		if (time_since_press() > BACKLIGHT_TIME) backlight_off();
+		else									 backlight_on();
+
+		usleep(THREAD_WAIT);
+	}
+
+	return 0;
 }
 
-int main(int argc, const char* argv[]) {
+int keypress_thread(void) {
 	FILE* fp = fopen(KEYBOARD_FILE, "r");
 	fseek(fp, 0, SEEK_END);
 
 	void* discard = malloc(KEYPRESS_SIZE);
 
-	// shared mem b/c new proc doesn't share mem space
-	last_press = mmap(NULL, sizeof(last_press), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
-
-	if (fork() == 0) {
-		daemonize();
-		light_thread();
-	} else daemonize();
-
 	while (1) {
 		fseek(fp, 0, SEEK_END);
 		fread(discard, 1, KEYPRESS_SIZE, fp);
@@ -136,3 +128,27 @@ int main(int argc, const char* argv[]) {
 
 	return 0;
 }
+
+void daemonize(void) {
+	daemon(0, 0);
+}
+
+int shared_mem_setup(void) {
+	last_press = mmap(NULL, sizeof(last_press), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+
+	return 0; // XXX error handling
+}
+
+int setup(void) {
+	daemonize();
+	shared_mem_setup();
+
+	return 0;
+}
+
+int main(int argc, const char* argv[]) {
+	setup();
+
+	if (fork() == 0) return light_thread();
+	else			 return keypress_thread();
+}