sysdeps/unix/sysv/linux/powerpc/powerpc64/vfork.S

   1 /* Copyright (C) 2003 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 #include <sysdep.h>
  20 #define _ERRNO_H        1
  21 #include <bits/errno.h>
  22 #include <kernel-features.h>
  23
  24 /* Clone the calling process, but without copying the whole address space.
  25    The calling process is suspended until the new process exits or is
  26    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
  27    and the process ID of the new process to the old process.  */
  28
  29 ENTRY (__vfork)
  30         CALL_MCOUNT 0
  31
  32 #ifdef __NR_vfork
  33
  34         DO_CALL (SYS_ify (vfork))
  35
  36 # ifdef __ASSUME_VFORK_SYSCALL
  37         PSEUDO_RET
  38 # else
  39         bnslr+
  40         /* Check if vfork syscall is known at all.  */
  41         cmpdi   r3,ENOSYS
  42         bne     .Local_syscall_error
  43
  44 # endif
  45 #endif
  46
  47 #ifndef __ASSUME_VFORK_SYSCALL
  48         /* If we don't have vfork, fork is close enough.  */
  49
  50         DO_CALL (SYS_ify (fork))
  51         PSEUDO_RET
  52 #endif
  53
  54 PSEUDO_END (__vfork)
  55 libc_hidden_def (__vfork)
  56
  57 weak_alias (__vfork, vfork)