diff options
Diffstat (limited to 'usr/src/lib/efcode/efdaemon/efdaemon.c')
| -rw-r--r-- | usr/src/lib/efcode/efdaemon/efdaemon.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/usr/src/lib/efcode/efdaemon/efdaemon.c b/usr/src/lib/efcode/efdaemon/efdaemon.c new file mode 100644 index 0000000000..7aba030848 --- /dev/null +++ b/usr/src/lib/efcode/efdaemon/efdaemon.c @@ -0,0 +1,185 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2000-2002 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +/* + * efdaemon - Emebbed Fcode Interpreter daemon. + * + * Opens /dev/fcode, detaches from tty and reads a request. Upon successful + * return, invokes the Fcode interpreter via the shell script: + * /usr/lib/efcode/efcode.sh Waits for completion of the interpreter. + */ + +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> +#include <strings.h> +#include <syslog.h> +#include <errno.h> +#include <sys/wait.h> + +char efcode_sh_file[] = "/usr/lib/efcode/efcode.sh"; +char dev_fcode_file[] = "/dev/fcode"; + +int debug = 0; + +int +main(int argc, char **argv) +{ + extern char *optarg; + extern int optind, opterr, optopt; + int c, fd, nbytes, status; + char tc; + pid_t pid, tpid; + long nerr = 0; + + openlog("efdaemon", LOG_PID|LOG_CONS, LOG_DAEMON); + + while ((c = getopt(argc, argv, "d")) != EOF) { + switch (c) { + + case 'd': + debug++; + break; + + case '?': + syslog(LOG_ERR, "Usage: efdaemon [ -d ]\n"); + exit(1); + } + } + + /* + * Ensure we can open /dev/fcode + */ + if ((fd = open(dev_fcode_file, O_RDONLY)) < 0) { + /* + * Only output message if debug is on. On most systems, + * /dev/fcode will not exist, so this message would pollute the + * console. + */ + if (debug) + syslog(LOG_ERR, "Can't open %s: %s\n", dev_fcode_file, + strerror(errno)); + exit(1); + } + close(fd); + + /* + * Ensure that /usr/lib/efcode/efcode.sh exists and is executable. + */ + if (access(efcode_sh_file, X_OK | R_OK)) { + syslog(LOG_ERR, "%s: %s\n", efcode_sh_file, strerror(errno)); + exit(1); + } + + /* + * Fork a child then parent exits so we're a child of initd. + */ + if ((pid = fork()) < 0) { + syslog(LOG_ERR, "Fork failed: %s\n", strerror(errno)); + exit(1); + } + if (pid) + exit(0); + + + /* + * detach from tty here. + */ + setpgrp(); + close(0); + close(1); + close(2); + (void) open("/dev/null", O_RDWR); + (void) dup(0); + (void) dup(0); + + for (;;) { + while ((fd = open(dev_fcode_file, O_RDONLY)) < 0) { + nerr++; + if (nerr == 1) + syslog(LOG_ERR, "Can't open %s: %s\n", + dev_fcode_file, strerror(errno)); + sleep(1); + } + if (nerr > 1) { + syslog(LOG_ERR, "Open on %s failed %d times\n", + dev_fcode_file, nerr); + } + nerr = 0; + nbytes = read(fd, &tc, sizeof (tc)); + if (nbytes < 0) { + syslog(LOG_ERR, "Read of %s: %s\n", dev_fcode_file, + strerror(errno)); + close(fd); + continue; + } + if (debug) + syslog(LOG_DEBUG, "Got request\n"); + while ((pid = fork()) < 0) { + nerr++; + if (nerr == 1) + syslog(LOG_ERR, "Fork failed: %s\n", + strerror(errno)); + sleep(1); + } + if ((nerr > 1) && pid) { + syslog(LOG_ERR, "Fork failed %d times\n", nerr); + } + nerr = 0; + if (pid) { + tpid = wait(&status); + if (tpid < 0) + syslog(LOG_ERR, "Wait error: %s\n", + strerror(errno)); + else if (pid != tpid) + syslog(LOG_ERR, "Wait error, expect pid: %d" + " got %d, status: %x\n", pid, tpid, status); + else if (status) + syslog(LOG_ERR, "Wait pid: %d status: %x\n", + pid, status); + else if (debug) + syslog(LOG_DEBUG, "Wait: pid: %d\n", pid); + close(fd); + continue; + } + if (debug) + syslog(LOG_DEBUG, "Child: %d processing request\n", + getpid()); + fcntl(fd, F_DUP2FD, 0); + while (execl("/bin/sh", "sh", efcode_sh_file, NULL)) { + nerr++; + if (nerr == 1) + syslog(LOG_ERR, "execl(/bin/sh) failed: %s\n", + strerror(errno)); + sleep(1); + } + } + + return (0); +} |