sysdeps/unix/sysv/linux/s390/s390-64/vfork.S

   1 /* Copyright (C) 2004-2024 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #define _ERRNO_H        1
  20 #include <bits/errno.h>
  21 #include <bits/wordsize.h>
  22 #include <tcb-offsets.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 (__libc_vfork)
  30         /* Do vfork system call.  */
  31         lghi    %r1,SYS_ify (vfork)
  32         svc     0
  33
  34         /* Check for error.  */
  35         lghi    %r4,-4095
  36         clgr    %r2,%r4
  37         jgnl    SYSCALL_ERROR_LABEL
  38
  39         /* Normal return.  */
  40         br      %r14
  41 PSEUDO_END (__libc_vfork)
  42
  43 #if IS_IN (libc)
  44 weak_alias (__libc_vfork, vfork)
  45 strong_alias (__libc_vfork, __vfork)
  46 libc_hidden_def (__vfork)
  47 #endif