startdaemon.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)startdaemon.c	4.1      ULTRIX 7/2/90";
#endif

/************************************************************************
 *									*
 *			Copyright (c) 1988 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 * startdaemon.c -- Cause new daemon to be spawned
 *
 * Description:
 *	Tell the printer daemon that there are new files in the
 *	spool directory.
 */

/* SCCS history beginning
 * ***************************************************************
 *                -- Revision History --
 * ***************************************************************
 * 
 * 1.1  01/11/83 -- sccs
 * date and time created 83/11/01 20:59:53 by sccs
 * 
 * ***************************************************************
 *
 * 1.2  19/07/88 -- thoms
 * Added copyright notice and modification history
 *
 * SCCS history end
 */


#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "lp.local.h"

startdaemon(printer)
	char *printer;
{
	struct sockaddr_un sun;
	register int s, n;
	char buf[BUFSIZ];

	s = socket(AF_UNIX, SOCK_STREAM, 0);
	if (s < 0) {
		perr("socket");
		return(0);
	}
	sun.sun_family = AF_UNIX;
	strcpy(sun.sun_path, SOCKETNAME);
	if (connect(s, &sun, strlen(sun.sun_path) + 2) < 0) {
		perr("connect");
		(void) close(s);
		return(0);
	}
	(void) sprintf(buf, "\1%s\n", printer);
	n = strlen(buf);
	if (write(s, buf, n) != n) {
		perr("write");
		(void) close(s);
		return(0);
	}
	if (read(s, buf, 1) == 1) {
		if (buf[0] == '\0') {		/* everything is OK */
			(void) close(s);
			return(1);
		}
		putchar(buf[0]);
	}
	while ((n = read(s, buf, sizeof(buf))) > 0)
		fwrite(buf, 1, n, stdout);
	(void) close(s);
	return(0);
}

static
perr(msg)
	char *msg;
{
	extern char *name;
	extern int sys_nerr;
	extern char *sys_errlist[];
	extern int errno;

	printf("%s: %s: ", name, msg);
	fputs(errno < sys_nerr ? sys_errlist[errno] : "Unknown error" , stdout);
	putchar('\n');
}