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| author | Andreas Schwab <schwab@suse.de> | 1999-01-13 01:43:33 +0000 |
|---|---|---|
| committer | Andreas Schwab <schwab@suse.de> | 1999-01-13 01:43:33 +0000 |
| commit | 9ddcbe57b0727d9c222c10ac1484b76d2cd4b1e8 (patch) | |
| tree | 56c0fc2940a0f706fa71a13857fe1e2b7b4d9508 /sysdeps/unix/sysv/linux/m68k | |
| parent | 7c97addd6fbb44818b6e4d219cdbd189554a10f3 (diff) | |
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* sysdeps/unix/sysv/linux/m68k/vfork.S: New file.
1999-01-13 Andreas Schwab <schwab@issan.cs.uni-dortmund.de>
* sysdeps/unix/sysv/linux/m68k/vfork.S: New file.
Diffstat (limited to 'sysdeps/unix/sysv/linux/m68k')
| -rw-r--r-- | sysdeps/unix/sysv/linux/m68k/vfork.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/vfork.S b/sysdeps/unix/sysv/linux/m68k/vfork.S new file mode 100644 index 0000000000..e5761f9371 --- /dev/null +++ b/sysdeps/unix/sysv/linux/m68k/vfork.S @@ -0,0 +1,65 @@ +/* Copyright (C) 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.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 __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@- + + /* Check if vfork syscall is known at all. */ + movel #-ENOSYS,%d1 + cmpl %d0,%d1 + jne SYSCALL_ERROR_LABEL + +#endif + + /* If we don't have vfork, fork is close enough. */ + + movel #SYS_ify (fork), %d0 + trap #0 + jmi SYSCALL_ERROR_LABEL + rts + +PSEUDO_END (__vfork) + +weak_alias (__vfork, vfork) |