sysdeps/unix/sparc/fork.S

   1 /* Copyright (C) 1991, 92, 94, 95, 97, 99, 2002 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19
  20 SYSCALL__ (fork, 0)
  21         /* %o1 is now 0 for the parent and 1 for the child.  Decrement it to
  22            make it -1 (all bits set) for the parent, and 0 (no bits set)
  23            for the child.  Then AND it with %o0, so the parent gets
  24            %o0&-1==pid, and the child gets %o0&0==0.  */
  25         sub %o1, 1, %o1
  26         retl
  27         and %o0, %o1, %o0
  28 libc_hidden_def (__fork)
  29
  30 weak_alias (__fork, fork)