1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2000-2002 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * efdaemon - Emebbed Fcode Interpreter daemon. 31 * 32 * Opens /dev/fcode, detaches from tty and reads a request. Upon successful 33 * return, invokes the Fcode interpreter via the shell script: 34 * /usr/lib/efcode/efcode.sh Waits for completion of the interpreter. 35 */ 36 37 #include <stdio.h> 38 #include <fcntl.h> 39 #include <unistd.h> 40 #include <stdlib.h> 41 #include <strings.h> 42 #include <syslog.h> 43 #include <errno.h> 44 #include <sys/wait.h> 45 46 char efcode_sh_file[] = "/usr/lib/efcode/efcode.sh"; 47 char dev_fcode_file[] = "/dev/fcode"; 48 49 int debug = 0; 50 51 int 52 main(int argc, char **argv) 53 { 54 extern char *optarg; 55 extern int optind, opterr, optopt; 56 int c, fd, nbytes, status; 57 char tc; 58 pid_t pid, tpid; 59 long nerr = 0; 60 61 openlog("efdaemon", LOG_PID|LOG_CONS, LOG_DAEMON); 62 63 while ((c = getopt(argc, argv, "d")) != EOF) { 64 switch (c) { 65 66 case 'd': 67 debug++; 68 break; 69 70 case '?': 71 syslog(LOG_ERR, "Usage: efdaemon [ -d ]\n"); 72 exit(1); 73 } 74 } 75 76 /* 77 * Ensure we can open /dev/fcode 78 */ 79 if ((fd = open(dev_fcode_file, O_RDONLY)) < 0) { 80 /* 81 * Only output message if debug is on. On most systems, 82 * /dev/fcode will not exist, so this message would pollute the 83 * console. 84 */ 85 if (debug) 86 syslog(LOG_ERR, "Can't open %s: %s\n", dev_fcode_file, 87 strerror(errno)); 88 exit(1); 89 } 90 close(fd); 91 92 /* 93 * Ensure that /usr/lib/efcode/efcode.sh exists and is executable. 94 */ 95 if (access(efcode_sh_file, X_OK | R_OK)) { 96 syslog(LOG_ERR, "%s: %s\n", efcode_sh_file, strerror(errno)); 97 exit(1); 98 } 99 100 /* 101 * Fork a child then parent exits so we're a child of initd. 102 */ 103 if ((pid = fork()) < 0) { 104 syslog(LOG_ERR, "Fork failed: %s\n", strerror(errno)); 105 exit(1); 106 } 107 if (pid) 108 exit(0); 109 110 111 /* 112 * detach from tty here. 113 */ 114 setpgrp(); 115 close(0); 116 close(1); 117 close(2); 118 (void) open("/dev/null", O_RDWR); 119 (void) dup(0); 120 (void) dup(0); 121 122 for (;;) { 123 while ((fd = open(dev_fcode_file, O_RDONLY)) < 0) { 124 nerr++; 125 if (nerr == 1) 126 syslog(LOG_ERR, "Can't open %s: %s\n", 127 dev_fcode_file, strerror(errno)); 128 sleep(1); 129 } 130 if (nerr > 1) { 131 syslog(LOG_ERR, "Open on %s failed %d times\n", 132 dev_fcode_file, nerr); 133 } 134 nerr = 0; 135 nbytes = read(fd, &tc, sizeof (tc)); 136 if (nbytes < 0) { 137 syslog(LOG_ERR, "Read of %s: %s\n", dev_fcode_file, 138 strerror(errno)); 139 close(fd); 140 continue; 141 } 142 if (debug) 143 syslog(LOG_DEBUG, "Got request\n"); 144 while ((pid = fork()) < 0) { 145 nerr++; 146 if (nerr == 1) 147 syslog(LOG_ERR, "Fork failed: %s\n", 148 strerror(errno)); 149 sleep(1); 150 } 151 if ((nerr > 1) && pid) { 152 syslog(LOG_ERR, "Fork failed %d times\n", nerr); 153 } 154 nerr = 0; 155 if (pid) { 156 tpid = wait(&status); 157 if (tpid < 0) 158 syslog(LOG_ERR, "Wait error: %s\n", 159 strerror(errno)); 160 else if (pid != tpid) 161 syslog(LOG_ERR, "Wait error, expect pid: %d" 162 " got %d, status: %x\n", pid, tpid, status); 163 else if (status) 164 syslog(LOG_ERR, "Wait pid: %d status: %x\n", 165 pid, status); 166 else if (debug) 167 syslog(LOG_DEBUG, "Wait: pid: %d\n", pid); 168 close(fd); 169 continue; 170 } 171 if (debug) 172 syslog(LOG_DEBUG, "Child: %d processing request\n", 173 getpid()); 174 fcntl(fd, F_DUP2FD, 0); 175 while (execl("/bin/sh", "sh", efcode_sh_file, NULL)) { 176 nerr++; 177 if (nerr == 1) 178 syslog(LOG_ERR, "execl(/bin/sh) failed: %s\n", 179 strerror(errno)); 180 sleep(1); 181 } 182 } 183 184 return (0); 185 } 186