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scope_daemon.c
119 lines (98 loc) · 2.34 KB
/
scope_daemon.c
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#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "scope_server.h"
/**
* @brief Signal handler for server.
*
* @param sig - Signal No. provided by system
*/
void server_sig_handler(int sig)
{
switch(sig) {
case SIGTERM:
server_stop();
break;
default:
break;
}
}
/**
* @brief Main function of whole server.
*
* @return EXIT_SUCCESS - when forked properly
* @return EXIT_FAILURE - on error during server initialization
* @return 0 - on application exit
*/
int main(void)
{
pid_t pid, sid;
int fd;
int ret = 0;
struct sigaction sa;
char buff[16] = {0};
sa.sa_handler = server_sig_handler;
sigemptyset(&sa.sa_mask);
sigaction(SIGTERM, &sa, NULL);
openlog("ScopeServer", LOG_PID | LOG_LOCAL0, LOG_LOCAL0);
pid = fork();
if(pid < 0) {
syslog(LOG_ERR, "Fork failed, daemon couldn't start! (errno = %d)\n", -errno);
return EXIT_FAILURE;
} else if(pid > 0){
return EXIT_SUCCESS;
}
openlog("ScopeServer", LOG_PID | LOG_LOCAL0, LOG_LOCAL0);
umask(0);
syslog(LOG_INFO, "[ScopeServer]: Daemon started!\n");
sid = setsid();
if(sid < 0) {
syslog(LOG_ERR, "Setsid failed, couldn't create new sid! (errno = %d)\n", -errno);
return EXIT_FAILURE;
}
sprintf(buff, "%ld", (long)getpid());
fd = open(SCOPE_FILE_PID, O_CREAT | O_WRONLY);
if(fd <0) {
syslog(LOG_ERR, "Couldn't create pid file! (errno = %d)\n", -errno);
ret = EXIT_FAILURE;
goto init_fail;
}
if(write(fd, buff, strlen(buff)+1) < 0) {
syslog(LOG_ERR, "Couldn't save pid file for ScopeServer! (errno = %d)\n", -errno);
close(fd);
ret = EXIT_FAILURE;
goto init_fail;
}
close(fd);
if(mkfifo(SCOPE_FILE_FIFO, O_RDWR) < 0) {
syslog(LOG_ERR, "Couldn't create fifo file: %s! (errno = %d)\n", SCOPE_FILE_FIFO, -errno);
ret = EXIT_FAILURE;
goto init_fail;
}
if(chdir("/") < 0) {
syslog(LOG_ERR, "Chdir failed! (errno = %d)\n", -errno);
ret = EXIT_FAILURE;
goto init_fail;
}
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
if(server_init() < 0) {
syslog(LOG_ERR, "Unable to initizalize the server! (errno = %d)\n", -errno);
ret = EXIT_FAILURE;
goto init_fail;
}
server_start();
init_fail:
unlink(SCOPE_FILE_FIFO);
unlink(SCOPE_FILE_PID);
closelog();
return ret;
}