sysdeps/unix/sysv/irix4/sigtramp.c

   1 /* Copyright (C) 1992, 1997, 2004 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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 (int sig, __sighandler_t func,
  40                                     void (*)(int sig, int code,
  41                                              struct sigcontext *,
  42                                              handler_type));
  43
  44 extern void __handler (int sig, int code, struct sigcontext *,
  45                        handler_type);
  46
  47 __sighandler_t
  48 signal (sig, func)
  49      int sig;
  50      __sighandler_t func;
  51 {
  52   return __raw_signal (sig, func, __handler);
  53 }