fix killing bspc processes on exit

src/barline.c

@@ -5,6 +5,7 @@
 
 #include "config.h"
 #include "format.h"
+#include "bspwm.h"
 
 char fname[256];
 char * monitor;
@@ -92,8 +93,7 @@ int main(int argc, char * argv[]) {
 			run = 0;
 	}
 
-	kill(0, SIGTERM);
-
+	bspwm_close();
 	format_free(format);
 	config_free(config);
 }

src/bspwm.c

@@ -1,12 +1,21 @@
 #include <poll.h>
 #include <signal.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <sys/wait.h>
 
 #include "bspwm.h"
 
+struct bspwm_pid {
+	int pid;
+	struct bspwm_pid * next;
+};
+
+struct bspwm_pid seed = {0, NULL};
+struct bspwm_pid * bspwm_pids = &seed;
+
 int bspwm_subscribe(const char * events) {
 	int bspwm[2];
 
@@ -26,6 +35,14 @@ int bspwm_subscribe(const char * events) {
 		// close write end of bspwm
 		close(bspwm[1]);
 
+		// add pid to list
+		struct bspwm_pid * pid = bspwm_pids;
+		while (pid->next != NULL)
+			pid = pid->next;
+		pid->next = malloc(sizeof(struct bspwm_pid));
+		pid->next->pid = ret;
+		pid->next->next = NULL;
+
 		// return the read end
 		return bspwm[0];
 	}
@@ -215,3 +232,21 @@ int bspwm_monitor(char ** report, const char * monitor) {
 
 	return chars;
 }
+
+void bspwm_close() {
+	// skip first pid
+	struct bspwm_pid * pid = bspwm_pids->next;
+	struct bspwm_pid * next = pid;
+
+	while (pid != NULL) {
+		// kill process
+		kill(pid->pid, SIGTERM);
+
+		// free pid
+		next = pid->next;
+		free(pid);
+
+		// go to next pid
+		pid = next;
+	}
+}

src/bspwm.h

@@ -9,4 +9,5 @@ void bspwm_id(enum bspwm_domain domain, const char * name, char * buf, size_t si
 int bspwm_readline(int bspwmfd, char * buf, size_t size);
 int bspwm_next(char ** report);
 int bspwm_monitor(char ** report, const char * monitor);
+void bspwm_close();
 #endif