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/*
* alix-switchd.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <sys/io.h>
#include <sys/stat.h>
#include <sys/types.h>
#define SCRIPT "/etc/alix-switch"
#define GPIOBASE 0x6100
typedef void (*sighandler_t)(int);
static sighandler_t handle_signal (int sig_nr, sighandler_t signalhandler) {
struct sigaction neu_sig, alt_sig;
neu_sig.sa_handler = signalhandler;
sigemptyset(&neu_sig.sa_mask);
neu_sig.sa_flags = SA_RESTART;
if (sigaction (sig_nr, &neu_sig, &alt_sig) < 0)
return SIG_ERR;
return alt_sig.sa_handler;
}
static void start_daemon (void) {
int i;
pid_t pid, sid;
handle_signal(SIGHUP, SIG_IGN);
if ((pid = fork ()) != 0)
exit(EXIT_FAILURE);
umask(0);
if ((sid = setsid()) < 0)
exit(EXIT_FAILURE);
chdir("/");
for (i = sysconf(_SC_OPEN_MAX); i > 0; i--)
close(i);
}
int main(int argc, char *argv[]) {
int i;
unsigned long bPort = 0;
struct timespec sleep;
int bDaemon = 0, bSwitch = 0, bState = 0;
for(i = 1; i < argc; i++) {
if (!strcasecmp(argv[i], "-d") || !strcasecmp(argv[i], "--daemon")) {
bDaemon = 1;
} else {
printf( "\nusage: %s [-d | --daemon]\n", argv[0]);
exit(EXIT_FAILURE);
}
}
if (iopl(3)) {
fprintf( stderr, "Could not set I/O permissions to level 3\n");
exit(EXIT_FAILURE);
}
if (bDaemon)
start_daemon();
sleep.tv_sec = 0;
sleep.tv_nsec = 50000000;
while(1) {
bPort = inl(GPIOBASE + 0xB0);
if ((bPort & 0x100) == 0)
bState = 1;
else
bState = 0;
if (bState && !bSwitch)
system(SCRIPT " on");
bSwitch = bState;
nanosleep(&sleep, NULL);
}
if (iopl(0)) {
fprintf(stderr, "Could not set I/O permissions to level 0");
exit(EXIT_FAILURE);
}
return EXIT_SUCCESS;
}
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