waitpid.s

Glibc 2.3.2源代码(解压后有100多M)

/* Copyright (C) 1993,94,95,97,2002 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>

ENTRY (__waitpid)
	/* The `waitpid' system call is distinguished from plain
	   `wait' by setting lots of bits in the processor flags.  */
	pushfl			/* Push the flags word.  */
	popl %eax		/* Pop it into the accumulator.  */
	orl $0x8c4, %eax	/* Set lots of bits.  */
	pushl %eax		/* Push the new flags word.  */
	popfl			/* Pop it into the flags.  */
	DO_CALL (wait, 2)
	movl 8(%esp), scratch	/* Put status pointer in scratch register.  */
	testl scratch, scratch	/* Is it non-nil?  */
	je null
	movl r1, (scratch)	/* Yes; store the status there.  */
null:	ret

libc_hidden_def (__waitpid)
weak_alias (__waitpid, waitpid)