From f5e2ab0edb7ca64e3682ae305d0c04ef0eb37f6b Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Sun, 12 Jan 2003 09:16:06 +0000 Subject: [PATCH] vfork implementation for LinuxThreads/Arm. --- .../unix/sysv/linux/arm/linuxthreads/vfork.S | 57 +++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/arm/linuxthreads/vfork.S diff --git a/sysdeps/unix/sysv/linux/arm/linuxthreads/vfork.S b/sysdeps/unix/sysv/linux/arm/linuxthreads/vfork.S new file mode 100644 index 0000000000..6092bd9fd4 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/linuxthreads/vfork.S @@ -0,0 +1,57 @@ +/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Philip Blundell . + + 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 +#define _ERRNO_H 1 +#include + +/* Clone the calling process, but without copying the whole address +pace. + 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 +rocess, + and the process ID of the new process to the old process. */ + + PSEUDO_PROLOGUE + +ENTRY (__vfork) + +#ifdef __NR_vfork + SINGLE_THREAD_P + bne HIDDEN_JUMPTARGET (__fork) + swi __NR_vfork + cmn a1, #4096 + RETINSTR(movcc, pc, lr) + + /* Check if vfork syscall is known at all. */ + ldr a2, =-ENOSYS + teq a1, a2 + bne PLTJMP(C_SYMBOL_NAME(__syscall_error)) +#endif + + /* If we don't have vfork, fork is close enough. */ + swi __NR_fork + cmn a1, #4096 + RETINSTR(movcc, pc, lr) + b PLTJMP(C_SYMBOL_NAME(__syscall_error)) + +PSEUDO_END (__vfork) +libc_hidden_def (__vfork) + +weak_alias (__vfork, vfork)