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- /* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Andreas Schwab <schwab@gnu.org>.
- 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, see
- <http://www.gnu.org/licenses/>. */
- #include <sysdep-cancel.h>
- #define _ERRNO_H 1
- #include <bits/errno.h>
- #include <bits/kernel-features.h>
- /* Clone the calling process, but without copying the whole address space.
- The calling process is suspended until the new process exits or is
- replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
- and the process ID of the new process to the old process. */
- ENTRY (__vfork)
- #ifdef SHARED
- tstl (__libc_pthread_functions@GOTPC, %pc)
- #else
- .weak pthread_create
- movel #pthread_create, %d0
- #endif
- jbne HIDDEN_JUMPTARGET (fork)
- #ifdef __NR_vfork
- /* Pop the return PC value into A0. */
- movel %sp@+, %a0
- /* Stuff the syscall number in D0 and trap into the kernel. */
- movel #SYS_ify (vfork), %d0
- trap #0
- tstl %d0
- jmi .Lerror /* Branch forward if it failed. */
- /* Jump to the return PC. */
- jmp %a0@
- .Lerror:
- /* Push back the return PC. */
- movel %a0,%sp@-
- # ifdef __ASSUME_VFORK_SYSCALL
- # ifndef __PIC__
- jbra SYSCALL_ERROR_LABEL
- # endif
- # else
- /* Check if vfork syscall is known at all. */
- movel #-ENOSYS,%d1
- cmpl %d0,%d1
- jne SYSCALL_ERROR_LABEL
- # endif
- #endif
- #ifndef __ASSUME_VFORK_SYSCALL
- /* If we don't have vfork, fork is close enough. */
- movel #SYS_ify (fork), %d0
- trap #0
- tstl %d0
- jmi SYSCALL_ERROR_LABEL
- rts
- #endif
- PSEUDO_END (__vfork)
- libc_hidden_def (__vfork)
- weak_alias (__vfork, vfork)
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