remove signal handling

src/main.c

@@ -2,7 +2,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include <signal.h>
 #include <jack/jack.h>
 #include <jack/midiport.h>
 #include <stdatomic.h>
@@ -172,13 +171,6 @@ static void jack_shutdown(void *arg)
     exit(0);
 }
 
-static void sigusr1_handler(int signo) {
-    (void)signo;
-    int state = atomic_load(&current_state);
-    int code = state + 1;
-    _exit(code);
-}
-
 int main(int argc, char *argv[])
 {
     (void)argc;
@@ -229,8 +221,6 @@ int main(int argc, char *argv[])
 
     fprintf(stderr, "looper running (client name '%s')\n", client_name);
 
-    /* allow SIGUSR1 to report state and exit */
-    signal(SIGUSR1, sigusr1_handler);
 
     prev_state = -1;   /* initialise change detection */