git.ozlabs.org Git - ccan/blob - ccan/breakpoint/breakpoint.c

   1 /* CC0 (Public domain) - see LICENSE file for details
   2  *
   3  * Idea for implementation thanks to stackoverflow.com:
   4  *      http://stackoverflow.com/questions/3596781/detect-if-gdb-is-running
   5  */
   6 #include <ccan/breakpoint/breakpoint.h>
   7
   8 bool breakpoint_initialized;
   9 bool breakpoint_under_debug;
  10
  11 /* This doesn't get called if we're under GDB. */
  12 static void trap(int signum)
  13 {
  14         breakpoint_initialized = true;
  15 }
  16
  17 void breakpoint_init(void)
  18 {
  19         struct sigaction old, new;
  20
  21         new.sa_handler = trap;
  22         new.sa_flags = 0;
  23         sigemptyset(&new.sa_mask);
  24         sigaction(SIGTRAP, &new, &old);
  25         kill(getpid(), SIGTRAP);
  26         sigaction(SIGTRAP, &old, NULL);
  27
  28         if (!breakpoint_initialized) {
  29                 breakpoint_initialized = true;
  30                 breakpoint_under_debug = true;
  31         }
  32 }