_exit.c

来自「Glibc 2.3.2源代码(解压后有100多M)」· C语言 代码 · 共 51 行

/* Copyright (C) 1994, 1997, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Joel Sherrill ([e-mail]),
     On-Line Applications Research Corporation.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <unistd.h>
#include <stdlib.h>
#include "m68020.h"

/* Return control to 135Bug */

void
__exit_trap ()
{
  set_vbr( 0 );                     /* restore 135Bug vectors */
  asm volatile( "trap   #15"  );    /* trap to 135Bug */
  asm volatile( ".short 0x63" );    /* return to 135Bug (.RETURN) */
  asm volatile( "jmp    main" );    /* restart program */
}

/* The function `_exit' should take a status argument and simply
   terminate program execution, using the low-order 8 bits of the
   given integer as status.  */

void
__attribute__ ((noreturn))
_exit (status)
     int status;
{
  /* status is ignored */

  M68Kvec[ 45 ] = __exit_trap;   /* install exit_trap handler */
  asm volatile( "trap #13" );  /* insures SUPV mode */
}
weak_alias (_exit, _Exit)