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* sysdeps/unix/sysv/linux/i386/vfork.S: Rewrite to use clone.

	* sysdeps/unix/sysv/linux/bits/sched.h: Define CLONE_VFORK.
This commit is contained in:
Ulrich Drepper 1999-01-19 15:34:49 +00:00
parent 3ef4002b3f
commit d53afacb55
3 changed files with 19 additions and 29 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
1999-01-19 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/i386/vfork.S: Rewrite to use clone.
* sysdeps/unix/sysv/linux/bits/sched.h: Define CLONE_VFORK.
* timezone/zdump.c: Update from tzcode1999a.
* timezone/zic.c: Likewise.

4
sysdeps/unix/sysv/linux/bits/sched.h
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@ -1,6 +1,6 @@
/* Definitions of constants and data structure for POSIX 1003.1b-1993
scheduling interface.
Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1996, 1997, 1998, 1999 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
@ -39,6 +39,8 @@
# define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared. */
# define CLONE_PID 0x00001000 /* Set if pid shared. */
# define CLONE_PTRACE 0x00002000 /* Set if tracing continues on the child. */
# define CLONE_VFORK 0x00004000 /* Set if the parent wants the child to
wake it up on mm_release. */
#endif
/* The official definition. */

40
sysdeps/unix/sysv/linux/i386/vfork.S
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@ -1,6 +1,6 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Schwab <schwab@gnu.org>.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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
@ -28,37 +28,21 @@
ENTRY (__vfork)
#ifdef __NR_vfork
/* We have to use the clone() system call. The flags to use are
CLONE_VFORK | CLONE_VM
and we send SIGCHLD on termination (i.e., flags = 0x4111). */
/* 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
popl %edx /* Pop return address. */
pushl %ebx
movl %esp, %ecx
movl $0x4111, %ebx
movl $SYS_ify(clone), %eax
int $0x80
popl %ebx
pushl %edx
cmpl $-4095, %eax
jae SYSCALL_ERROR_LABEL
.Lpseudo_end:
L(pseudo_end):
ret
PSEUDO_END (__vfork)