sysdeps/unix/sysv/irix4/sigtramp.c

   1 /* Copyright (C) 1992, 1997 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, 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 <signal.h>
  32 #include <stddef.h>
  33 #include <errno.h>
  34
  35 /* The user's signal handler is called with three arguments.  */
  36 typedef void (*handler_type) (int sig, int code, struct sigcontext *);
  37
  38 /* Defined in signal.S.  */
  39 extern __sighandler_t __raw_signal __P((int sig, __sighandler_t func,
  40                                         void (*)(int sig, int code,
  41                                                  struct sigcontext *,
  42                                                  handler_type)));
  43
  44 extern void __handler __P((int sig, int code,
  45                            struct sigcontext *,
  46                            handler_type));
  47
  48 __sighandler_t
  49 signal (sig, func)
  50      int sig;
  51      __sighandler_t func;
  52 {
  53   return __raw_signal (sig, func, __handler);
  54 }