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 #include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
33 #include <sys/param.h>
34 #include <sys/socket.h>
35 #include <sys/uio.h>
36 #include <sys/un.h>
37
38 #include <dirent.h>
39 #include <err.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <unistd.h>
43 #include "lp.h"
44 #include "pathnames.h"
45
46 /*
47 * Tell the printer daemon that there are new files in the spool directory.
48 */
49
50 int
startdaemon(const struct printer * pp)51 startdaemon(const struct printer *pp)
52 {
53 struct sockaddr_un un;
54 register int s, n;
55 int connectres;
56 char c;
57
58 s = socket(PF_LOCAL, SOCK_STREAM, 0);
59 if (s < 0) {
60 warn("socket");
61 return(0);
62 }
63 memset(&un, 0, sizeof(un));
64 un.sun_family = AF_LOCAL;
65 strcpy(un.sun_path, _PATH_SOCKETNAME);
66 #ifndef SUN_LEN
67 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
68 #endif
69 PRIV_START
70 connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un));
71 PRIV_END
72 if (connectres < 0) {
73 warn("Unable to connect to %s", _PATH_SOCKETNAME);
74 warnx("Check to see if the master 'lpd' process is running.");
75 (void) close(s);
76 return(0);
77 }
78
79 /*
80 * Avoid overruns without putting artificial limitations on
81 * the length.
82 */
83 if (writel(s, "\1", pp->printer, "\n", (char *)0) <= 0) {
84 warn("write");
85 (void) close(s);
86 return(0);
87 }
88 if (read(s, &c, 1) == 1) {
89 if (c == '\0') { /* everything is OK */
90 (void) close(s);
91 return(1);
92 }
93 putchar(c);
94 }
95 while ((n = read(s, &c, 1)) > 0)
96 putchar(c);
97 (void) close(s);
98 return(0);
99 }
100