kernel/system/do_abort.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_ABORT
   3  *
   4  * The parameters for this kernel call are:
   5  *    m1_i1:    ABRT_HOW        (how to abort, possibly fetch monitor params)
   6  *    m1_i2:    ABRT_MON_ENDPT  (proc nr to get monitor params from)
   7  *    m1_i3:    ABRT_MON_LEN    (length of monitor params)
   8  *    m1_p1:    ABRT_MON_ADDR   (virtual address of params)
   9  */
  10
  11 #include "kernel/system.h"
  12 #include <unistd.h>
  13
  14 #if USE_ABORT
  15
  16 /*===========================================================================*
  17  *                              do_abort                                     *
  18  *===========================================================================*/
  19 int do_abort(struct proc * caller, message * m_ptr)
  20 {
  21 /* Handle sys_abort. MINIX is unable to continue. This can originate e.g.
  22  * in the PM (normal abort) or TTY (after CTRL-ALT-DEL).
  23  */
  24   int how = m_ptr->ABRT_HOW;
  25
  26   /* See if the monitor is to run the specified instructions. */
  27   if (how == RBT_MONITOR) {
  28       int p;
  29       static char paramsbuffer[512];
  30       int len;
  31       len = MIN(m_ptr->ABRT_MON_LEN, sizeof(paramsbuffer)-1);
  32
  33       if((p=data_copy(m_ptr->ABRT_MON_ENDPT, (vir_bytes) m_ptr->ABRT_MON_ADDR,
  34                 KERNEL, (vir_bytes) paramsbuffer, len)) != OK) {
  35                 return p;
  36       }
  37       paramsbuffer[len] = '\0';
  38   }
  39
  40   /* Now prepare to shutdown MINIX. */
  41   prepare_shutdown(how);
  42   return(OK);                           /* pro-forma (really EDISASTER) */
  43 }
  44
  45 #endif /* USE_ABORT */
  46