kernel/utility.c

   1 /* This file contains a collection of miscellaneous procedures:
   2  *   panic:         abort MINIX due to a fatal error
   3  *   kprintf:       (from lib/sysutil/kprintf.c)
   4  *   kputc:         buffered putc used by kernel kprintf
   5  */
   6
   7 #include "kernel.h"
   8 #include "proc.h"
   9
  10 #include <unistd.h>
  11 #include <signal.h>
  12
  13 /*===========================================================================*
  14  *                              panic                                        *
  15  *===========================================================================*/
  16 PUBLIC void panic(mess,nr)
  17 _CONST char *mess;
  18 int nr;
  19 {
  20 /* The system has run aground of a fatal kernel error. Terminate execution. */
  21   static int panicking = 0;
  22   if (panicking ++) return;             /* prevent recursive panics */
  23
  24   if (mess != NULL) {
  25         kprintf("\nKernel panic: %s", mess);
  26         if (nr != NO_NUM) kprintf(" %d", nr);
  27         kprintf("\n",NO_NUM);
  28   }
  29
  30   /* Abort MINIX. */
  31   prepare_shutdown(RBT_PANIC);
  32 }
  33
  34
  35 /* Include system printf() implementation named kprintf() */
  36
  37 #define printf kprintf
  38 #include "../lib/sysutil/kprintf.c"
  39 #define END_OF_KMESS    0
  40
  41 /*===========================================================================*
  42  *                              kputc                                        *
  43  *===========================================================================*/
  44 PUBLIC void kputc(c)
  45 int c;                                  /* character to append */
  46 {
  47 /* Accumulate a single character for a kernel message. Send a notification
  48  * to the output driver if an END_OF_KMESS is encountered.
  49  */
  50   if (c != END_OF_KMESS) {
  51       if (do_serial_debug)
  52         ser_putc(c);
  53       kmess.km_buf[kmess.km_next] = c;  /* put normal char in buffer */
  54       if (kmess.km_size < KMESS_BUF_SIZE)
  55           kmess.km_size += 1;
  56       kmess.km_next = (kmess.km_next + 1) % KMESS_BUF_SIZE;
  57   } else {
  58       int p, outprocs[] = OUTPUT_PROCS_ARRAY;
  59       for(p = 0; outprocs[p] != NONE; p++) {
  60          if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
  61            send_sig(outprocs[p], SIGKMESS);
  62          }
  63       }
  64   }
  65 }
  66