1/* vfork for Linux. 2 Copyright (C) 2022 Free Software Foundation, Inc. 3 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public License as 8 published by the Free Software Foundation; either version 2.1 of the 9 License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <https://www.gnu.org/licenses/>. */ 19 20#include <sysdep.h> 21#define _ERRNO_H 1 22#include <bits/errno.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 29ENTRY (__vfork) 30 31 li.d a0, 0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ 32 add.d a1, zero, sp 33 34 /* Do the system call. */ 35 li.d a7, __NR_clone 36 syscall 0 37 38 blt a0, zero ,L (error) 39 40 ret 41 42L (error): 43 b __syscall_error 44 45END (__vfork) 46 47libc_hidden_def (__vfork) 48 49weak_alias (__vfork, vfork) 50strong_alias (__vfork, __libc_vfork) 51