cmd/hotplugd/hotplugd.c

269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * CDDL HEADER START
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan * The contents of this file are subject to the terms of the
269473047d747f7815af570197e4ef7322d3632cEvan Yan * Common Development and Distribution License (the "License").
269473047d747f7815af570197e4ef7322d3632cEvan Yan * You may not use this file except in compliance with the License.
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
269473047d747f7815af570197e4ef7322d3632cEvan Yan * or http://www.opensolaris.org/os/licensing.
269473047d747f7815af570197e4ef7322d3632cEvan Yan * See the License for the specific language governing permissions
269473047d747f7815af570197e4ef7322d3632cEvan Yan * and limitations under the License.
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan * When distributing Covered Code, include this CDDL HEADER in each
269473047d747f7815af570197e4ef7322d3632cEvan Yan * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
269473047d747f7815af570197e4ef7322d3632cEvan Yan * If applicable, add the following below this CDDL HEADER, with the
269473047d747f7815af570197e4ef7322d3632cEvan Yan * fields enclosed by brackets "[]" replaced with your own identifying
269473047d747f7815af570197e4ef7322d3632cEvan Yan * information: Portions Copyright [yyyy] [name of copyright owner]
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan * CDDL HEADER END
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
269473047d747f7815af570197e4ef7322d3632cEvan Yan * Use is subject to license terms.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <stdio.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <stdlib.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <unistd.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <errno.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <fcntl.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <signal.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <stdarg.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <strings.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <syslog.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <priv.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <wait.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <getopt.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <synch.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <sys/param.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <sys/stat.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <sys/types.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <libhotplug.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include <libhotplug_impl.h>
269473047d747f7815af570197e4ef7322d3632cEvan Yan#include "hotplugd_impl.h"
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * Define long options for command line.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic const struct option lopts[] = {
269473047d747f7815af570197e4ef7322d3632cEvan Yan    { "help",   no_argument,    0, '?' },
269473047d747f7815af570197e4ef7322d3632cEvan Yan    { "version",    no_argument,    0, 'V' },
269473047d747f7815af570197e4ef7322d3632cEvan Yan    { "debug",  no_argument,    0, 'd' },
269473047d747f7815af570197e4ef7322d3632cEvan Yan    { 0, 0, 0, 0 }
269473047d747f7815af570197e4ef7322d3632cEvan Yan};
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * Local functions.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void     usage(void);
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic boolean_t    check_privileges(void);
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic int      daemonize(void);
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void     init_signals(void);
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void     signal_handler(int signum);
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void     shutdown_daemon(void);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * Global variables.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic char     *prog;
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic char     version[] = "1.0";
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic boolean_t    log_flag = B_FALSE;
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic boolean_t    debug_flag = B_FALSE;
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic boolean_t    exit_flag = B_FALSE;
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic sema_t       signal_sem;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * main()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  The hotplug daemon is designed to be a background daemon
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  controlled by SMF.  So by default it will daemonize and
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  do some coordination with its parent process in order to
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  indicate proper success or failure back to SMF.  And all
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  output will be sent to syslog.
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  But if given the '-d' command line option, it will instead
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  run in the foreground in a standalone, debug mode.  Errors
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  and additional debug messages will be printed to the controlling
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  terminal instead of to syslog.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanint
269473047d747f7815af570197e4ef7322d3632cEvan Yanmain(int argc, char *argv[])
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    int opt;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    int pfd;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    int status;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if ((prog = strrchr(argv[0], '/')) == NULL)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        prog = argv[0];
269473047d747f7815af570197e4ef7322d3632cEvan Yan    else
269473047d747f7815af570197e4ef7322d3632cEvan Yan        prog++;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Check privileges */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (!check_privileges()) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) fprintf(stderr, "Insufficient privileges.  "
269473047d747f7815af570197e4ef7322d3632cEvan Yan            "(All privileges are required.)\n");
269473047d747f7815af570197e4ef7322d3632cEvan Yan        return (-1);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Process options  */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    while ((opt = getopt_clip(argc, argv, "dV?", lopts, NULL)) != -1) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        switch (opt) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        case 'd':
269473047d747f7815af570197e4ef7322d3632cEvan Yan            debug_flag = B_TRUE;
269473047d747f7815af570197e4ef7322d3632cEvan Yan            break;
269473047d747f7815af570197e4ef7322d3632cEvan Yan        case 'V':
269473047d747f7815af570197e4ef7322d3632cEvan Yan            (void) printf("%s: Version %s\n", prog, version);
269473047d747f7815af570197e4ef7322d3632cEvan Yan            return (0);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        default:
269473047d747f7815af570197e4ef7322d3632cEvan Yan            if (optopt == '?') {
269473047d747f7815af570197e4ef7322d3632cEvan Yan                usage();
269473047d747f7815af570197e4ef7322d3632cEvan Yan                return (0);
269473047d747f7815af570197e4ef7322d3632cEvan Yan            }
269473047d747f7815af570197e4ef7322d3632cEvan Yan            (void) fprintf(stderr, "Unrecognized option '%c'.\n",
269473047d747f7815af570197e4ef7322d3632cEvan Yan                optopt);
269473047d747f7815af570197e4ef7322d3632cEvan Yan            usage();
269473047d747f7815af570197e4ef7322d3632cEvan Yan            return (-1);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        }
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Initialize semaphore for daemon shutdown */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (sema_init(&signal_sem, 1, USYNC_THREAD, NULL) != 0)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        exit(EXIT_FAILURE);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Initialize signal handling */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    init_signals();
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Daemonize, if not in DEBUG mode */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (!debug_flag)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        pfd = daemonize();
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Initialize door service */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (!door_server_init()) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        if (!debug_flag) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan            status = EXIT_FAILURE;
269473047d747f7815af570197e4ef7322d3632cEvan Yan            (void) write(pfd, &status, sizeof (status));
269473047d747f7815af570197e4ef7322d3632cEvan Yan            (void) close(pfd);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        }
269473047d747f7815af570197e4ef7322d3632cEvan Yan        exit(EXIT_FAILURE);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Daemon initialized */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (!debug_flag) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        status = 0;
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) write(pfd, &status, sizeof (status));
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) close(pfd);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Note that daemon is running */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    log_info("hotplug daemon started.\n");
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Wait for shutdown signal */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    while (!exit_flag)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) sema_wait(&signal_sem);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    shutdown_daemon();
269473047d747f7815af570197e4ef7322d3632cEvan Yan    return (0);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * usage()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Print a brief usage synopsis for the command line options.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void
269473047d747f7815af570197e4ef7322d3632cEvan Yanusage(void)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) printf("Usage: %s [-d]\n", prog);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * check_privileges()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Check if the current process has enough privileges
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  to run the daemon.  Note that all privileges are
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  required in order for RCM interactions to work.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic boolean_t
269473047d747f7815af570197e4ef7322d3632cEvan Yancheck_privileges(void)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    priv_set_t  *privset;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    boolean_t   rv = B_FALSE;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if ((privset = priv_allocset()) != NULL) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        if (getppriv(PRIV_EFFECTIVE, privset) == 0) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan            rv = priv_isfullset(privset);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        }
269473047d747f7815af570197e4ef7322d3632cEvan Yan        priv_freeset(privset);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    return (rv);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * daemonize()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Fork the daemon process into the background, and detach from
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  the controlling terminal.  Setup a shared pipe that will later
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  be used to report startup status to the parent process.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic int
269473047d747f7815af570197e4ef7322d3632cEvan Yandaemonize(void)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    int     status;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    int     pfds[2];
269473047d747f7815af570197e4ef7322d3632cEvan Yan    pid_t       pid;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    sigset_t    set;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    sigset_t    oset;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /*
269473047d747f7815af570197e4ef7322d3632cEvan Yan     * Temporarily block all signals.  They will remain blocked in
269473047d747f7815af570197e4ef7322d3632cEvan Yan     * the parent, but will be unblocked in the child once it has
269473047d747f7815af570197e4ef7322d3632cEvan Yan     * notified the parent of its startup status.
269473047d747f7815af570197e4ef7322d3632cEvan Yan     */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigfillset(&set);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigdelset(&set, SIGABRT);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigprocmask(SIG_BLOCK, &set, &oset);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Create the shared pipe */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (pipe(pfds) == -1) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        log_err("Cannot create pipe (%s)\n", strerror(errno));
269473047d747f7815af570197e4ef7322d3632cEvan Yan        exit(EXIT_FAILURE);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Fork the daemon process */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if ((pid = fork()) == -1) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        log_err("Cannot fork daemon process (%s)\n", strerror(errno));
269473047d747f7815af570197e4ef7322d3632cEvan Yan        exit(EXIT_FAILURE);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Parent:  waits for exit status from child. */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (pid > 0) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) close(pfds[1]);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        if (read(pfds[0], &status, sizeof (status)) == sizeof (status))
269473047d747f7815af570197e4ef7322d3632cEvan Yan            _exit(status);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        if ((waitpid(pid, &status, 0) == pid) && WIFEXITED(status))
269473047d747f7815af570197e4ef7322d3632cEvan Yan            _exit(WEXITSTATUS(status));
269473047d747f7815af570197e4ef7322d3632cEvan Yan        log_err("Failed to spawn daemon process.\n");
269473047d747f7815af570197e4ef7322d3632cEvan Yan        _exit(EXIT_FAILURE);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Child continues... */
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) setsid();
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) chdir("/");
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) umask(CMASK);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) close(pfds[0]);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Detach from controlling terminal */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) close(0);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) close(1);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) close(2);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) open("/dev/null", O_RDONLY);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) open("/dev/null", O_WRONLY);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) open("/dev/null", O_WRONLY);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    /* Use syslog for future messages */
269473047d747f7815af570197e4ef7322d3632cEvan Yan    log_flag = B_TRUE;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    openlog(prog, LOG_PID, LOG_DAEMON);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    return (pfds[1]);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * init_signals()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Initialize signal handling.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void
269473047d747f7815af570197e4ef7322d3632cEvan Yaninit_signals(void)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    struct sigaction    act;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    sigset_t        set;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigfillset(&set);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigdelset(&set, SIGABRT);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigfillset(&act.sa_mask);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    act.sa_handler = signal_handler;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    act.sa_flags = 0;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigaction(SIGTERM, &act, NULL);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigaction(SIGHUP, &act, NULL);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigaction(SIGINT, &act, NULL);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigaction(SIGPIPE, &act, NULL);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigdelset(&set, SIGTERM);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigdelset(&set, SIGHUP);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigdelset(&set, SIGINT);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sigdelset(&set, SIGPIPE);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * signal_handler()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Most signals cause the hotplug daemon to shut down.
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Shutdown is triggered using a semaphore to wake up
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  the main thread for a clean exit.
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Except SIGPIPE is used to coordinate between the parent
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  and child processes when the daemon first starts.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void
269473047d747f7815af570197e4ef7322d3632cEvan Yansignal_handler(int signum)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    log_info("Received signal %d.\n", signum);
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    switch (signum) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan    case 0:
269473047d747f7815af570197e4ef7322d3632cEvan Yan    case SIGPIPE:
269473047d747f7815af570197e4ef7322d3632cEvan Yan        break;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    default:
269473047d747f7815af570197e4ef7322d3632cEvan Yan        exit_flag = B_TRUE;
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) sema_post(&signal_sem);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        break;
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * shutdown_daemon()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Perform a clean shutdown of the daemon.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yanstatic void
269473047d747f7815af570197e4ef7322d3632cEvan Yanshutdown_daemon(void)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    log_info("Hotplug daemon shutting down.\n");
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    door_server_fini();
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (log_flag)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        closelog();
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    (void) sema_destroy(&signal_sem);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * log_err()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Display an error message.  Use syslog if in daemon
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  mode, otherwise print to stderr when in debug mode.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*PRINTFLIKE1*/
269473047d747f7815af570197e4ef7322d3632cEvan Yanvoid
269473047d747f7815af570197e4ef7322d3632cEvan Yanlog_err(char *fmt, ...)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_list ap;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_start(ap, fmt);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (debug_flag || !log_flag)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) vfprintf(stderr, fmt, ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    else
269473047d747f7815af570197e4ef7322d3632cEvan Yan        vsyslog(LOG_ERR, fmt, ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_end(ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * log_info()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Display an information message.  Use syslog if in daemon
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  mode, otherwise print to stdout when in debug mode.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*PRINTFLIKE1*/
269473047d747f7815af570197e4ef7322d3632cEvan Yanvoid
269473047d747f7815af570197e4ef7322d3632cEvan Yanlog_info(char *fmt, ...)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_list ap;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_start(ap, fmt);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (debug_flag || !log_flag)
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) vfprintf(stdout, fmt, ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    else
269473047d747f7815af570197e4ef7322d3632cEvan Yan        vsyslog(LOG_INFO, fmt, ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_end(ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan}
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*
269473047d747f7815af570197e4ef7322d3632cEvan Yan * dprintf()
269473047d747f7815af570197e4ef7322d3632cEvan Yan *
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  Print a debug tracing statement.  Only works in debug
269473047d747f7815af570197e4ef7322d3632cEvan Yan *  mode, and always prints to stdout.
269473047d747f7815af570197e4ef7322d3632cEvan Yan */
269473047d747f7815af570197e4ef7322d3632cEvan Yan/*PRINTFLIKE1*/
269473047d747f7815af570197e4ef7322d3632cEvan Yanvoid
269473047d747f7815af570197e4ef7322d3632cEvan Yandprintf(char *fmt, ...)
269473047d747f7815af570197e4ef7322d3632cEvan Yan{
269473047d747f7815af570197e4ef7322d3632cEvan Yan    va_list ap;
269473047d747f7815af570197e4ef7322d3632cEvan Yan
269473047d747f7815af570197e4ef7322d3632cEvan Yan    if (debug_flag) {
269473047d747f7815af570197e4ef7322d3632cEvan Yan        va_start(ap, fmt);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        (void) vprintf(fmt, ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan        va_end(ap);
269473047d747f7815af570197e4ef7322d3632cEvan Yan    }
269473047d747f7815af570197e4ef7322d3632cEvan Yan}