sysdeps/unix/sysv/irix4/sigtramp.c

   1 /* Copyright (C) 1992 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /* The sigvec system call on MIPS Ultrix takes an additional
  20    parameter, which is the address that is actually called when the
  21    signal occurs.
  22
  23    When a signal occurs, we arrange for the kernel to call __handler.
  24    That will save the frame and stack pointers into the context, and
  25    then jump to this routine.  See __handler.S.
  26
  27    This code is based on sysdeps/unix/bsd/sun4/sigtramp.c, but it's
  28    different because since we get passed the user signal handler we
  29    don't actually need a trampoline.  */
  30
  31 #include <ansidecl.h>
  32 #include <signal.h>
  33 #include <stddef.h>
  34 #include <errno.h>
  35
  36 /* The user's signal handler is called with three arguments.  */
  37 typedef void (*handler_type) (int sig, int code, struct sigcontext *);
  38
  39 /* Defined in signal.S.  */
  40 extern __sighandler_t EXFUN(__raw_signal, (int sig, __sighandler_t func,
  41                                 void (*)(int sig, int code,
  42                                          struct sigcontext *,
  43                                          handler_type)));
  44
  45 extern void EXFUN(__handler, (int sig, int code,
  46                               struct sigcontext *,
  47                               handler_type));
  48
  49 __sighandler_t
  50 DEFUN(signal, (sig, func),
  51       int sig AND __sighandler_t func)
  52 {
  53   return __raw_signal (sig, func, __handler);
  54 }