fetch signals

1 files changed, 30 insertions, 2 deletions

diff --git a/anzeige.c b/anzeige.c
index 52116bf..60ac8f9 100644
--- a/anzeige.c
+++ b/anzeige.c
@@ -8,17 +8,20 @@
 #include <errno.h>
 #include <string.h>
 #include <pthread.h>
+#include <signal.h>
 
 #include "fonts.h"
 #include "input_gadgets.h"
 #include "multiplexer.h"
 
 void drop_privileges();
+void handle_signals(int signo);
+
+t_display_data display_data;
 
 int main(int argc, char **argv)
 {
   pthread_t thread_id;
-  t_display_data display_data;
   int ret_val;
   #define TEXT_BUFFER_LENGTH 256
   char *text_buffer;
@@ -33,6 +36,21 @@ int main(int argc, char **argv)
   // Drop root privileges
   drop_privileges();
 
+  // set up / register signal handler
+  struct sigaction new_action, old_action;
+  new_action.sa_handler = handle_signals;
+  sigemptyset (&new_action.sa_mask);
+  new_action.sa_flags = 0;
+  sigaction (SIGINT, NULL, &old_action);
+  if (old_action.sa_handler != SIG_IGN)
+    sigaction (SIGINT, &new_action, NULL);
+  sigaction (SIGHUP, NULL, &old_action);
+  if (old_action.sa_handler != SIG_IGN)
+    sigaction (SIGHUP, &new_action, NULL);
+  sigaction (SIGTERM, NULL, &old_action);
+  if (old_action.sa_handler != SIG_IGN)
+    sigaction (SIGTERM, &new_action, NULL);struct sigaction action;
+
  /************************************************************************\
   * You are about to change the GPIO settings of your computer.          *
   * Mess this up and it will stop working!                               *
@@ -77,11 +95,13 @@ int main(int argc, char **argv)
 
   scroll_buffers[0].scroll_len = render(text_buffer, TEXT_BUFFER_LENGTH, scroll_buffers[0].buf, sizeof(scroll_buffers[0].buf), 1);
 
-  for (i=0; i>=0; i++) {
+  i=0;
+  while (display_data.keep_running) {
     usleep(100000);
     for (j=0; j<40; j++)
       display_data.buf[(display_data.should_buf+1)%3][j] = scroll_buffers[0].buf[(i+j) % scroll_buffers[0].scroll_len];
     display_data.should_buf = (display_data.should_buf+1)%3;
+    i++;
   }
 
   free(text_buffer);
@@ -108,3 +128,11 @@ void drop_privileges()
       exit(-1);
    }
 } // drop_root
+
+void handle_signals(int signo)
+{
+  if ((signo == SIGINT) || (signo == SIGHUP) || (signo == SIGTERM)) {
+    fprintf(stderr, "stopping\n");
+    display_data.keep_running = 0;
+  }
+}