sysdeps/unix/sysv/linux/powerpc/powerpc32/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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #define _ERRNO_H        1
  20 #include <bits/errno.h>
  21 #include <kernel-features.h>
  22
  23 /* Clone the calling process, but without copying the whole address space.
  24    The calling process is suspended until the new process exits or is
  25    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
  26    and the process ID of the new process to the old process.  */
  27
  28 ENTRY (__vfork)
  29
  30 #ifdef __NR_vfork
  31
  32         DO_CALL (SYS_ify (vfork))
  33
  34 # ifdef __ASSUME_VFORK_SYSCALL
  35         PSEUDO_RET
  36 # else
  37         bnslr+
  38         /* Check if vfork syscall is known at all.  */
  39         cmpwi   r3,ENOSYS
  40         bne-    .Lsyscall_error
  41
  42 # endif
  43 #endif
  44
  45 #ifndef __ASSUME_VFORK_SYSCALL
  46         /* If we don't have vfork, fork is close enough.  */
  47
  48         DO_CALL (SYS_ify (fork))
  49         bnslr+
  50
  51 .Lsyscall_error:
  52         b       __syscall_error@local
  53 #endif
  54
  55 PSEUDO_END (__vfork)
  56 libc_hidden_def (__vfork)
  57
  58 weak_alias (__vfork, vfork)