1 /* $OpenBSD: startdaemon.c,v 1.13 2009/10/27 23:59:51 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/param.h> 34 #include <sys/socket.h> 35 #include <sys/un.h> 36 37 #include <dirent.h> 38 #include <err.h> 39 #include <errno.h> 40 #include <stdio.h> 41 #include <unistd.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 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_LOCAL, 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_LOCAL; 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, SUN_LEN(&un)) < 0) { 70 if (errno == EINTR && gotintr) { 71 PRIV_END; 72 siginterrupt(SIGINT, 0); 73 close(s); 74 return(0); 75 } 76 PRIV_END; 77 siginterrupt(SIGINT, 0); 78 warn("connect"); 79 (void)close(s); 80 return(0); 81 } 82 PRIV_END; 83 siginterrupt(SIGINT, 0); 84 if ((n = snprintf(buf, sizeof(buf), "\1%s\n", printer)) >= sizeof(buf) || 85 n == -1) { 86 close(s); 87 return (0); 88 } 89 90 /* XXX atomicio inside siginterrupt? */ 91 if (write(s, buf, n) != n) { 92 warn("write"); 93 (void)close(s); 94 return(0); 95 } 96 if (read(s, buf, 1) == 1) { 97 if (buf[0] == '\0') { /* everything is OK */ 98 (void)close(s); 99 return(1); 100 } 101 putchar(buf[0]); 102 } 103 while ((n = read(s, buf, sizeof(buf))) > 0) 104 fwrite(buf, 1, n, stdout); 105 (void)close(s); 106 return(0); 107 } 108