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path: root/polux/devkit/plcd/src/plcd_main.c
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/* Polux projet {{{
 *
 * Copyright (C) 2013 MStar Semiconductor
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    polux/devkit/plcd/src/plcd_main.c
 * \ingroup polux_devkit_plcd
 */
#include "inc/plcd_main.h"
#include "inc/plcd_autoswitch.h"
#include "plc-drv/ioctl-interface.h" /* ioctl_plcd_t */
#include <linux/sockios.h> /* SIOCDEVPRIVATE for plc_ioctl.h */
#include "plc-drv/plc_ioctl.h" /* SIOC_PLC_DAEMON */

#include <syslog.h> /* syslog */
#include <stdlib.h> /* EXIT_SUCCESS */
#include <signal.h> /* signal */
#include <sys/types.h> /* pid_t */
#include <unistd.h> /* getpid */
#include <net/if.h>
#include <assert.h>


volatile sig_atomic_t exit_requested;
static int plc_sock;

static int
plcd_send_ioctl (ioctl_plcd_t *ioctl_plcd)
{
    int fd;
    struct ifreq ifr;

    assert (plc_sock);

    memset (&ifr,0,sizeof(struct ifreq));
    strcpy (ifr.ifr_name, "plc0");
    ifr.ifr_data = (char *) ioctl_plcd;

    if (0 > ioctl (plc_sock, SIOC_PLC_DAEMON, &ifr))
    {
        syslog (LOG_WARNING, "ioctl send failed");
        return -1;
    }

    return 0;
}

static int
plcd_register_to_plcdrv (void)
{
    ioctl_plcd_t ioctl;
    ioctl.subcmd = IOC_PLCD_REGISTER;
    ioctl.pid = getpid ();

    plcd_send_ioctl (&ioctl);
}

static int
plcd_unregister_to_plcdrv (void)
{
    ioctl_plcd_t ioctl;
    ioctl.subcmd = IOC_PLCD_UNREGISTER;

    plcd_send_ioctl (&ioctl);
}

static void
plcd_signal_handler (int event)
{
    /* Check received signal. */
    switch (event)
    {
    case SIGTERM:
        exit_requested = 1;
        break;

    default:
        syslog (LOG_WARNING, "PLCD: unexpected signal %d dropped\n", event);
        break;
    }
}

static int
plcd_init (void)
{
    exit_requested = 0;

    signal (SIGTERM, plcd_signal_handler);

    if (0 > (plc_sock = socket (AF_INET, SOCK_DGRAM, 0)))
    {
        syslog (LOG_WARNING, "socket open failed");
        return -1;
    }

    return 0;
}

static void
plcd_uninit (void)
{
    close (plc_sock);
}

int
main (int argc, char **argv)
{
    if (0 > plcd_init ())
        exit (EXIT_FAILURE);

    plcd_autoswitch_timer_init ();

    /* show PLCD version */
    syslog (LOG_NOTICE, "PLC Daemon (%s) Running\n", PLCD_VERSION);

    /* Terminate the daemon when no feature is enable. */
    if (plcd_autoswitch_timer_is_enable ())
    {
        plcd_register_to_plcdrv ();
        while (!exit_requested)
            pause ();
        plcd_unregister_to_plcdrv ();
    }

    syslog (LOG_NOTICE, "PLC Daemon exiting\n");

    plcd_autoswitch_timer_uninit ();
    plcd_uninit ();
    exit (EXIT_SUCCESS);
}