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   endpoint_t me = NONE;
  19   char name[20];
  20   void (*suicide)(void);
  21   static int panicing= 0;
  22   va_list args;
  23
  24   if(panicing) return;
  25   panicing= 1;
  26
  27   if(sys_whoami(&me, name, sizeof(name)) == OK && me != NONE)
  28         printf("%s(%d): panic: ", name, me);
  29   else
  30         printf("(sys_whoami failed): panic: ");
  31
  32   if(fmt) {
  33         va_start(args, fmt);
  34         vprintf(fmt, args);
  35         va_end(args);
  36   } else {
  37         printf("no message\n");
  38   }
  39   printf("\n");
  40
  41   printf("syslib:panic.c: stacktrace: ");
  42   util_stacktrace();
  43
  44   /* Try exit */
  45   _exit(1);
  46
  47   /* Try to signal ourself */
  48   abort();
  49
  50   /* If exiting nicely through PM fails for some reason, try to
  51    * commit suicide. E.g., message to PM might fail due to deadlock.
  52    */
  53   suicide = (void (*)(void)) -1;
  54   suicide();
  55
  56   /* If committing suicide fails for some reason, hang. */
  57   for(;;) { }
  58 }
  59