kill.c

来自「操作系统SunOS 4.1.3版本的源码」· C语言 代码 · 共 36 行

#if !defined(lint) && defined(SCCSIDS)
static	char sccsid[] = "@(#)kill.c 1.1 92/07/30 SMI";
#endif

/*
	kill -- system call emulation for 4.2BSD

	last edit:	02-Jan-1985	D A Gwyn
*/

#include	<errno.h>
#include	<sys/signal.h>

extern int	_kill(), killpg(), getpid();

int
kill( pid, sig )
	register int	pid;		/* process ID or special code */
	register int	sig;		/* signal to be sent */
	{
	register int	retval;		/* function return value */

	if ( sig == SIGKILL && pid == 1	/* undocumented kernel check */
	   )	{
		errno = EINVAL;		/* kernel would've allowed it */
		return -1;
		}

	if ( pid < -1 )
		return killpg( -pid, sig );
	else	if ( (retval = _kill( pid, sig )) == 0 && pid == -1 )
			return _kill( getpid(), sig );
		else
			return retval;
	}