clouseau: Created clouseau daemon clouseaud.c stab

Signed-off-by: Aharon Hillel <a.hillel@partner.samsung.com>

SVN revision: 71003

src/bin/clouseaud.c

@@ -0,0 +1,78 @@
+/*
+ * UNIX Daemon Server Programming Sample Program
+ * Levent Karakas <levent at mektup dot at> May 2001
+ *
+ * To compile: cc -o clouseaud clouseaud.c
+ * To run:     ./clouseaud
+ * To test daemon:   ps -ef|grep clouseaud (or ps -aux on BSD systems)
+ * To test log:   tail -f /tmp/clouseaud.log
+ * To test signal:   kill -HUP `cat /tmp/clouseaud.lock`
+ * To terminate:  kill `cat /tmp/clouseaud.lock`
+ * */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+
+#define RUNNING_DIR  "/tmp"
+#define LOCK_FILE "clouseaud.lock"
+#define LOG_FILE  "clouseaud.log"
+
+void log_message(char *filename, char *message)
+{
+   FILE *logfile;
+   logfile=fopen(filename,"a");
+   if(!logfile) return;
+   fprintf(logfile,"%s\n",message);
+   fclose(logfile);
+}
+
+void signal_handler(int sig)
+{
+   switch(sig) {
+      case SIGHUP:
+         log_message(LOG_FILE,"hangup signal catched");
+         break;
+      case SIGTERM:
+         log_message(LOG_FILE,"terminate signal catched");
+         exit(0);
+         break;
+   }
+}
+
+void daemonize(void)
+{
+   int i,lfp;
+   char str[10];
+   if(getppid()==1) return; /* already a daemon */
+   i=fork();
+   if (i<0) exit(1); /* fork error */
+   if (i>0) exit(0); /* parent exits */
+   /* child (daemon) continues */
+   setsid(); /* obtain a new process group */
+   for (i=getdtablesize();i>=0;--i) close(i); /* close all descriptors */
+   i=open("/dev/null",O_RDWR); dup(i); dup(i); /* handle standart I/O */
+   umask(027); /* set newly created file permissions */
+   chdir(RUNNING_DIR); /* change running directory */
+   lfp=open(LOCK_FILE,O_RDWR|O_CREAT,0640);
+   if (lfp<0) exit(1); /* can not open */
+   if (lockf(lfp,F_TLOCK,0)<0) exit(0); /* can not lock */
+   /* first instance continues */
+   sprintf(str,"%d\n",getpid());
+   write(lfp,str,strlen(str)); /* record pid to lockfile */
+   signal(SIGCHLD,SIG_IGN); /* ignore child */
+   signal(SIGTSTP,SIG_IGN); /* ignore tty signals */
+   signal(SIGTTOU,SIG_IGN);
+   signal(SIGTTIN,SIG_IGN);
+   signal(SIGHUP,signal_handler); /* catch hangup signal */
+   signal(SIGTERM,signal_handler); /* catch kill signal */
+}
+
+int main(int argc, char **argv)
+{
+   daemonize();
+   while(1) sleep(1); /* run */
+}