kernel/system/do_endksig.c

   1 /* The kernel call that is implemented in this file:
   2  *   m_type:    SYS_ENDKSIG
   3  *
   4  * The parameters for this kernel call are:
   5  *     m2_i1:   SIG_PROC        # process for which PM is done
   6  */
   7
   8 #include "../system.h"
   9 #include <signal.h>
  10 #include <sys/sigcontext.h>
  11
  12 #if USE_ENDKSIG
  13
  14 /*===========================================================================*
  15  *                            do_endksig                                     *
  16  *===========================================================================*/
  17 PUBLIC int do_endksig(m_ptr)
  18 message *m_ptr;                 /* pointer to request message */
  19 {
  20 /* Finish up after a kernel type signal, caused by a SYS_KILL message or a
  21  * call to cause_sig by a task. This is called by the PM after processing a
  22  * signal it got with SYS_GETKSIG.
  23  */
  24   register struct proc *rp;
  25
  26   /* Get process pointer and verify that it had signals pending. If the
  27    * process is already dead its flags will be reset.
  28    */
  29   rp = proc_addr(m_ptr->SIG_PROC);
  30   if (! (rp->p_rts_flags & SIG_PENDING)) return(EINVAL);
  31
  32   /* PM has finished one kernel signal. Perhaps process is ready now? */
  33   if (! (rp->p_rts_flags & SIGNALED))           /* new signal arrived */
  34      if ((rp->p_rts_flags &= ~SIG_PENDING)==0)  /* remove pending flag */
  35          lock_enqueue(rp);                      /* ready if no flags */
  36   return(OK);
  37 }
  38
  39 #endif /* USE_ENDKSIG */
  40