minix/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 void panic_hook(void);
  10
  11 __weak_alias(panic_hook, __panic_hook);
  12
  13 void __panic_hook(void)
  14 {
  15         ;
  16 }
  17
  18 /*===========================================================================*
  19  *                              panic                                *
  20  *===========================================================================*/
  21 void panic(const char *fmt, ...)
  22 {
  23 /* Something awful has happened. Panics are caused when an internal
  24  * inconsistency is detected, e.g., a programming error or illegal
  25  * value of a defined constant.
  26  */
  27   endpoint_t me = NONE;
  28   char name[20];
  29   int priv_flags;
  30   int init_flags;
  31   void (*suicide)(void);
  32   va_list args;
  33
  34   if(sys_whoami(&me, name, sizeof(name), &priv_flags, &init_flags) == OK && me != NONE)
  35         printf("%s(%d): panic: ", name, me);
  36   else
  37         printf("(sys_whoami failed): panic: ");
  38
  39   if(fmt) {
  40         va_start(args, fmt);
  41         vprintf(fmt, args);
  42         va_end(args);
  43   } else {
  44         printf("no message\n");
  45   }
  46   printf("\n");
  47
  48   printf("syslib:panic.c: stacktrace: ");
  49   util_stacktrace();
  50
  51   panic_hook();
  52
  53   /* Try exit */
  54   _exit(1);
  55
  56   /* Try to signal ourself */
  57   abort();
  58
  59   /* If exiting nicely through PM fails for some reason, try to
  60    * commit suicide. E.g., message to PM might fail due to deadlock.
  61    */
  62   suicide = (void (*)(void)) -1;
  63   suicide();
  64
  65   /* If committing suicide fails for some reason, hang. */
  66   for(;;) { }
  67 }
  68