1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if 0
33 #ifndef lint
34 static char sccsid[] = "@(#)startdaemon.c 8.2 (Berkeley) 4/17/94";
35 #endif /* not lint */
36 #endif
37
38 #include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
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
56 int
startdaemon(const struct printer * pp)57 startdaemon(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