1 /* $OpenBSD: startdaemon.c,v 1.18 2019/07/03 03:24:03 deraadt Exp $ */
2 /* $NetBSD: startdaemon.c,v 1.10 1998/07/18 05:04:39 lukem Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/socket.h>
34 #include <sys/un.h>
35
36 #include <dirent.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <stdio.h>
40 #include <unistd.h>
41 #include <limits.h>
42 #include <string.h>
43 #include <signal.h>
44
45 #include "lp.h"
46 #include "pathnames.h"
47
48 /*
49 * Tell the printer daemon that there are new files in the spool directory.
50 */
51 int
startdaemon(char * printer)52 startdaemon(char *printer)
53 {
54 struct sockaddr_un un;
55 int s;
56 size_t n;
57 char buf[BUFSIZ];
58
59 s = socket(AF_UNIX, SOCK_STREAM, 0);
60 if (s < 0) {
61 warn("socket");
62 return(0);
63 }
64 memset(&un, 0, sizeof(un));
65 un.sun_family = AF_UNIX;
66 strlcpy(un.sun_path, _PATH_SOCKETNAME, sizeof(un.sun_path));
67 siginterrupt(SIGINT, 1);
68 PRIV_START;
69 if (connect(s, (struct sockaddr *)&un, sizeof(un)) < 0) {
70 int saved_errno = errno;
71 if (errno == EINTR && gotintr) {
72 PRIV_END;
73 siginterrupt(SIGINT, 0);
74 close(s);
75 return(0);
76 }
77 PRIV_END;
78 siginterrupt(SIGINT, 0);
79 warnc(saved_errno, "connect");
80 (void)close(s);
81 return(0);
82 }
83 PRIV_END;
84 siginterrupt(SIGINT, 0);
85 if ((n = snprintf(buf, sizeof(buf), "\1%s\n", printer)) < 0 ||
86 n >= sizeof(buf)) {
87 close(s);
88 return (0);
89 }
90
91 /* XXX atomicio inside siginterrupt? */
92 if (write(s, buf, n) != n) {
93 warn("write");
94 (void)close(s);
95 return(0);
96 }
97 if (read(s, buf, 1) == 1) {
98 if (buf[0] == '\0') { /* everything is OK */
99 (void)close(s);
100 return(1);
101 }
102 putchar(buf[0]);
103 }
104 while ((n = read(s, buf, sizeof(buf))) > 0)
105 fwrite(buf, 1, n, stdout);
106 (void)close(s);
107 return(0);
108 }
109