startdaemon.c revision 15703 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
36#endif /* not lint */
37
38
39#include <sys/param.h>
40#include <sys/socket.h>
41#include <sys/un.h>
42
43#include <dirent.h>
44#include <errno.h>
45#include <stdio.h>
46#include <unistd.h>
47#include <string.h>
48#include "lp.h"
49#include "pathnames.h"
50
51static void perr __P((char *));
52
53/*
54 * Tell the printer daemon that there are new files in the spool directory.
55 */
56
57int
58startdaemon(printer)
59	char *printer;
60{
61	struct sockaddr_un un;
62	register int s, n;
63	char buf[BUFSIZ];
64
65	s = socket(AF_UNIX, SOCK_STREAM, 0);
66	if (s < 0) {
67		perr("socket");
68		return(0);
69	}
70	memset(&un, 0, sizeof(un));
71	un.sun_family = AF_UNIX;
72	strcpy(un.sun_path, _PATH_SOCKETNAME);
73#ifndef SUN_LEN
74#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
75#endif
76	if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) {
77		perr("connect");
78		(void) close(s);
79		return(0);
80	}
81	(void) sprintf(buf, "\1%s\n", printer);
82	n = strlen(buf);
83	if (write(s, buf, n) != n) {
84		perr("write");
85		(void) close(s);
86		return(0);
87	}
88	if (read(s, buf, 1) == 1) {
89		if (buf[0] == '\0') {		/* everything is OK */
90			(void) close(s);
91			return(1);
92		}
93		putchar(buf[0]);
94	}
95	while ((n = read(s, buf, sizeof(buf))) > 0)
96		fwrite(buf, 1, n, stdout);
97	(void) close(s);
98	return(0);
99}
100
101static void
102perr(msg)
103	char *msg;
104{
105	(void)printf("%s: %s: %s\n", name, msg, strerror(errno));
106}
107