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| -rw-r--r-- | ChangeLog | 3 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/vfork.S | 66 |
2 files changed, 69 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 8b25523e8f..ad61443e9e 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,8 @@ 1999-01-21 Ulrich Drepper <drepper@cygnus.com> + * sysdeps/unix/sysv/linux/i386/vfork.S: Add back the first + implementation now that the syscall is back in 2.2.0. + * elf/Makefile: Change rule to make test module so that they are compiled using -fPIC. * elf/testobj1.c: Add missing prototype. diff --git a/sysdeps/unix/sysv/linux/i386/vfork.S b/sysdeps/unix/sysv/linux/i386/vfork.S new file mode 100644 index 0000000000..118fccb613 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/vfork.S @@ -0,0 +1,66 @@ +/* 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 ECX. */ + popl %ecx + + /* Stuff the syscall number in EAX and enter into the kernel. */ + movl $SYS_ify (vfork), %eax + int $0x80 + cmpl $-4095, %eax + jae .Lerror /* Branch forward if it failed. */ + + /* Jump to the return PC. */ + jmp *%ecx + +.Lerror: + /* Push back the return PC. */ + pushl %ecx + + /* Check if vfork syscall is known at all. */ + cmpl $-ENOSYS, %eax + jne SYSCALL_ERROR_LABEL + +#endif + + /* If we don't have vfork, fork is close enough. */ + + movl $SYS_ify (fork), %eax + int $0x80 + cmpl $-4095, %eax + jae SYSCALL_ERROR_LABEL +.Lpseudo_end: + ret + +PSEUDO_END (__vfork) + +weak_alias (__vfork, vfork) |