compiler/clib/raise.c

   1 /*
   2     Copyright © 2009-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include "__signal.h"
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11 #include <signal.h>
  12
  13         int raise(
  14
  15 /*  SYNOPSIS */
  16         int signum)
  17
  18 /*  FUNCTION
  19         Calls the handler of a signal
  20
  21     INPUTS
  22         Signal handler to be called.
  23
  24     RESULT
  25         0: OK
  26         -1: error calling handler, errno will be set.
  27
  28     NOTES
  29         The behaviour of raise() follows the BSD semantics.
  30         For each signal the system keeps track of a signal handler is already
  31         being called.
  32         If not, the signal handler is called; when yes this will logged and the
  33         handler will be recalled when the first handler returns. If the a new
  34         handler is registered that one will be used then.
  35
  36     EXAMPLE
  37
  38     BUGS
  39
  40     SEE ALSO
  41
  42     INTERNALS
  43
  44 ******************************************************************************/
  45 {
  46     struct signal_func_data *sigfuncdata = __sig_getfuncdata(signum);
  47
  48     if (!sigfuncdata)
  49         return -1;
  50
  51     /* If a signal handler raises it's own signal then the current
  52        signal handler will be called when the first handler completes.
  53     */
  54     sigfuncdata->flags |= __SIG_PENDING;
  55     while (!(sigfuncdata->flags & __SIG_RUNNING)
  56            && (sigfuncdata->flags & __SIG_PENDING)
  57     )
  58     {
  59         __sighandler_t *func = sigfuncdata->sigfunc;
  60         if (func == SIG_DFL)
  61             func = __sig_default;
  62
  63         sigfuncdata->flags |= __SIG_RUNNING; /* Signal handler is running ... */
  64         sigfuncdata->flags &= ~__SIG_PENDING; /* ... and not pending anymore */
  65
  66         if (func != SIG_IGN)
  67             func(signum);
  68
  69         sigfuncdata->flags &= ~__SIG_RUNNING; /* Signal is not running anymore */
  70     }
  71
  72     return 0;
  73 }