use signalfd instead

lisgd.c

@@ -3,6 +3,7 @@
 #include <libinput.h>
 #include <math.h>
 #include <signal.h>
+#include <sys/signalfd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -39,10 +40,12 @@ typedef struct {
 
 /* Globals */
 Gesture *gestsarr;
+Gesture *originalgestures;
 int gestsarrlen;
 Swipe pendingswipe;
 double xstart[MAXSLOTS], xend[MAXSLOTS], ystart[MAXSLOTS], yend[MAXSLOTS];
 unsigned nfdown = 0, nfpendingswipe = 0;
+unsigned orientationdirty = 0;
 struct timespec timedown;
 
 void
@@ -141,6 +144,22 @@ swipereorient(Swipe swipe, int orientation) {
 	return swipe;
 }
 
+void
+reorientgestures(int orientation) {
+	for (int i = 0; i < gestsarrlen; i++)
+		gestsarr[i].swipe = swipereorient(originalgestures[i].swipe, orientation);
+}
+
+void
+changeorientation(int _signal, siginfo_t *info, void *_none) {
+	int new_orientation = (info->si_value).sival_int;
+
+	if (orientation != new_orientation) {
+		orientation = new_orientation;
+		orientationdirty = 1;
+	}
+}
+
 void
 touchdown(struct libinput_event *e)
 {
@@ -212,6 +231,25 @@ touchup(struct libinput_event *e)
 	}
 }
 
+int
+sigusr1fd() {
+	sigset_t mask;
+	int sfd;
+
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGUSR1);
+	if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1) {
+		die("Can't block SIGUSR1.");
+	}
+
+	sfd = signalfd(-1, &mask, 0);
+	if (sfd == -1) {
+		die("Can't open signalfd on SIGUSR1.");
+	}
+
+	return sfd;
+}
+
 void
 run()
 {
@@ -221,7 +259,12 @@ run()
 	struct libinput_event_touch *tevent;
 	struct libinput_device *d;
 	int selectresult;
+
 	fd_set fdset;
+	int li_fd;
+	int sig_fd;
+	int sfdrsize;
+	struct signalfd_siginfo sfdinfo;
 
 	const static struct libinput_interface interface = {
 		.open_restricted = libinputopenrestricted,
@@ -246,21 +289,37 @@ run()
 		ystart[i] = NOMOTION;
 	}
 
-	FD_ZERO(&fdset);
-	FD_SET(libinput_get_fd(li), &fdset);
+	sig_fd = sigusr1fd();
+	li_fd = libinput_get_fd(li);
+
 	for (;;) {
+		FD_ZERO(&fdset);
+		FD_SET(sig_fd, &fdset);
+		FD_SET(li_fd, &fdset);
 		selectresult = select(FD_SETSIZE, &fdset, NULL, NULL, NULL);
+
 		if (selectresult == -1) {
 			die("Can't select on device node?");
-		} else {
-			libinput_dispatch(li);
-			while ((event = libinput_get_event(li)) != NULL) {
-				switch(libinput_event_get_type(event)) {
-					case LIBINPUT_EVENT_TOUCH_DOWN: touchdown(event); break;
-					case LIBINPUT_EVENT_TOUCH_UP: touchup(event); break;
-					case LIBINPUT_EVENT_TOUCH_MOTION: touchmotion(event); break;
+		}
+		else {
+			if (FD_ISSET(sig_fd, &fdset)) {
+				sfdrsize = read(sig_fd, &sfdinfo, sizeof(struct signalfd_siginfo));
+
+				if (sfdrsize != sizeof(struct signalfd_siginfo)) {
+					die("Couldn't read reorient signal.");
+				}
+				reorientgestures(sfdinfo.ssi_int);
+			}
+			if (FD_ISSET(li_fd, &fdset)) {
+				libinput_dispatch(li);
+				while ((event = libinput_get_event(li)) != NULL) {
+					switch(libinput_event_get_type(event)) {
+						case LIBINPUT_EVENT_TOUCH_DOWN: touchdown(event); break;
+						case LIBINPUT_EVENT_TOUCH_UP: touchup(event); break;
+						case LIBINPUT_EVENT_TOUCH_MOTION: touchmotion(event); break;
+					}
+					libinput_event_destroy(event);
 				}
-				libinput_event_destroy(event);
 			}
 		}
 	}
@@ -329,9 +388,12 @@ main(int argc, char *argv[])
 		memcpy(gestsarr, gestures, sizeof(gestures));
 	}
 
-  // Modify gestures swipes based on orientation provided
-	for (i = 0; i < gestsarrlen; i++)
-		gestsarr[i].swipe = swipereorient(gestsarr[i].swipe, orientation);
+	// Save original gestures for runtime orientation change
+	originalgestures = malloc(sizeof(Gesture) * gestsarrlen);
+	memcpy(originalgestures, gestsarr, sizeof(Gesture) * gestsarrlen);
+
+	// Modify gestures swipes based on orientation provided
+	reorientgestures(orientation);
 
 	run();
 	return 0;