startdaemon.c revision 331722 
1/*
2 * Copyright (c) 1983, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
33#endif /* not lint */
34#endif
35
36#include "lp.cdefs.h"		/* A cross-platform version of <sys/cdefs.h> */
37__FBSDID("$FreeBSD: stable/11/usr.sbin/lpr/common_source/startdaemon.c 331722 2018-03-29 02:50:57Z eadler $");
38
39#include <sys/param.h>
40#include <sys/socket.h>
41#include <sys/uio.h>
42#include <sys/un.h>
43
44#include <dirent.h>
45#include <err.h>
46#include <stdio.h>
47#include <string.h>
48#include <unistd.h>
49#include "lp.h"
50#include "pathnames.h"
51
52/*
53 * Tell the printer daemon that there are new files in the spool directory.
54 */
55
56int
57startdaemon(const struct printer *pp)
58{
59	struct sockaddr_un un;
60	register int s, n;
61	int connectres;
62	char c;
63
64	s = socket(PF_LOCAL, SOCK_STREAM, 0);
65	if (s < 0) {
66		warn("socket");
67		return(0);
68	}
69	memset(&un, 0, sizeof(un));
70	un.sun_family = AF_LOCAL;
71	strcpy(un.sun_path, _PATH_SOCKETNAME);
72#ifndef SUN_LEN
73#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
74#endif
75	PRIV_START
76	connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un));
77	PRIV_END
78	if (connectres < 0) {
79		warn("Unable to connect to %s", _PATH_SOCKETNAME);
80		warnx("Check to see if the master 'lpd' process is running.");
81		(void) close(s);
82		return(0);
83	}
84
85	/*
86	 * Avoid overruns without putting artificial limitations on
87	 * the length.
88	 */
89	if (writel(s, "\1", pp->printer, "\n", (char *)0) <= 0) {
90		warn("write");
91		(void) close(s);
92		return(0);
93	}
94	if (read(s, &c, 1) == 1) {
95		if (c == '\0') {		/* everything is OK */
96			(void) close(s);
97			return(1);
98		}
99		putchar(c);
100	}
101	while ((n = read(s, &c, 1)) > 0)
102		putchar(c);
103	(void) close(s);
104	return(0);
105}
106