rom/exec/setsignal.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Examine and/or modify the signals of a task.
   6     Lang: english
   7 */
   8
   9 #define DEBUG 0
  10
  11 #include <exec/execbase.h>
  12 #include <aros/libcall.h>
  13 #include <proto/exec.h>
  14
  15 #include "exec_intern.h"
  16 #if defined(__AROSEXEC_SMP__)
  17 #include "etask.h"
  18 #endif
  19
  20 /*****************************************************************************
  21
  22     NAME */
  23
  24         AROS_LH2(ULONG, SetSignal,
  25
  26 /*  SYNOPSIS */
  27         AROS_LHA(ULONG, newSignals, D0),
  28         AROS_LHA(ULONG, signalSet,  D1),
  29
  30 /*  LOCATION */
  31         struct ExecBase *, SysBase, 51, Exec)
  32
  33 /*  FUNCTION
  34         Change or read the set of signals sent to the current task.
  35
  36     INPUTS
  37         newSignals - New values for the signals.
  38         signalSet  - Mask of signals affected by 'newSignals'.
  39
  40     RESULT
  41         Old signal set.
  42
  43     NOTES
  44
  45     EXAMPLE
  46
  47     BUGS
  48
  49     SEE ALSO
  50         AllocSignal(), FreeSignal(), Wait(), Signal(), SetExcept()
  51
  52     INTERNALS
  53
  54 ******************************************************************************/
  55 {
  56     AROS_LIBFUNC_INIT
  57
  58     struct Task *thisTask = GET_THIS_TASK;
  59     ULONG *sig;
  60     ULONG old = 0;
  61
  62     if (thisTask)
  63     {
  64         /* Protect the signal mask against access by other tasks. */
  65         Disable();
  66
  67         /* Get address */
  68         sig = &thisTask->tc_SigRecvd;
  69
  70         /* Change only the bits in 'mask' */
  71         old = *sig;
  72         *sig = (old & ~signalSet) | (newSignals & signalSet);
  73
  74         Enable();
  75     }
  76
  77     return old;
  78     AROS_LIBFUNC_EXIT
  79 } /* SetSignal() */
  80