lib/libsys/panic.c

   1 #include <stdlib.h>
   2 #include <signal.h>
   3 #include <unistd.h>
   4 #include <stdarg.h>
   5 #include <minix/sysutil.h>
   6
   7 #include "syslib.h"
   8
   9 /*===========================================================================*
  10  *                              panic                                *
  11  *===========================================================================*/
  12 PUBLIC void panic(const char *fmt, ...)
  13 {
  14 /* Something awful has happened. Panics are caused when an internal
  15  * inconsistency is detected, e.g., a programming error or illegal
  16  * value of a defined constant.
  17  */
  18   message m;
  19   endpoint_t me = NONE;
  20   char name[20];
  21   void (*suicide)(void);
  22   static int panicing= 0;
  23   va_list args;
  24
  25   if(panicing) return;
  26   panicing= 1;
  27
  28   if(sys_whoami(&me, name, sizeof(name)) == OK && me != NONE)
  29         printf("%s(%d): panic: ", name, me);
  30   else
  31         printf("(sys_whoami failed): panic: ");
  32
  33   if(fmt) {
  34         va_start(args, fmt);
  35         vprintf(fmt, args);
  36         va_end(fmt);
  37   } else {
  38         printf("no message\n");
  39   }
  40   printf("\n");
  41
  42   printf("syslib:panic.c: stacktrace: ");
  43   util_stacktrace();
  44
  45   /* Try exit */
  46   _exit(1);
  47
  48   /* Try to signal ourself */
  49   abort();
  50
  51   /* If exiting nicely through PM fails for some reason, try to
  52    * commit suicide. E.g., message to PM might fail due to deadlock.
  53    */
  54   suicide = (void (*)(void)) -1;
  55   suicide();
  56
  57   /* If committing suicide fails for some reason, hang. */
  58   for(;;) { }
  59 }
  60