diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/vfork.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/vfork.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/vfork.S b/sysdeps/unix/sysv/linux/x86_64/vfork.S new file mode 100644 index 0000000000..0b5a90a6c8 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/vfork.S @@ -0,0 +1,52 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, 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) + + /* Pop the return PC value into RBX. */ + popq %rbx + + /* Stuff the syscall number in RAX and enter into the kernel. */ + movl $SYS_ify (vfork), %eax + syscall + cmpl $-4095, %eax + jae .Lerror /* Branch forward if it failed. */ + + /* Jump to the return PC. */ + jmp *%rbx + +.Lerror: + /* Push back the return PC. */ + pushq %rbx + jmp SYSCALL_ERROR_LABEL + +.Lpseudo_end: + ret + +PSEUDO_END (__vfork) + +weak_alias (__vfork, vfork) |