minix/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  *      m_sigcalls.endpt        # process for which PM is done
   6  */
   7
   8 #include "kernel/system.h"
   9
  10 #if USE_ENDKSIG
  11
  12 /*===========================================================================*
  13  *                            do_endksig                                     *
  14  *===========================================================================*/
  15 int do_endksig(struct proc * caller, message * m_ptr)
  16 {
  17 /* Finish up after a kernel type signal, caused by a SYS_KILL message or a
  18  * call to cause_sig by a task. This is called by a signal manager after
  19  * processing a signal it got with SYS_GETKSIG.
  20  */
  21   register struct proc *rp;
  22   int proc_nr;
  23
  24   /* Get process pointer and verify that it had signals pending. If the
  25    * process is already dead its flags will be reset.
  26    */
  27   if(!isokendpt(m_ptr->m_sigcalls.endpt, &proc_nr))
  28         return EINVAL;
  29
  30   rp = proc_addr(proc_nr);
  31   if (caller->p_endpoint != priv(rp)->s_sig_mgr) return(EPERM);
  32   if (!RTS_ISSET(rp, RTS_SIG_PENDING)) return(EINVAL);
  33
  34   /* The signal manager has finished one kernel signal. Is the process ready? */
  35   if (!RTS_ISSET(rp, RTS_SIGNALED))             /* new signal arrived */
  36         RTS_UNSET(rp, RTS_SIG_PENDING); /* remove pending flag */
  37   return(OK);
  38 }
  39
  40 #endif /* USE_ENDKSIG */
  41