how to programing daemon to create log record every second

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# 1  
Old 03-12-2012
how to programing daemon to create log record every second

i write .....

#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>

#define RUNNING_DIR     "/tmp"
#define LOCK_FILE       "exampled.lock"
#define LOG_FILE        "exampled.log"

void log_message(filename,message)
char *filename;
char *message;
FILE *logfile;
        if(!logfile) return;

void signal_handler(sig)
int sig;
        switch(sig) {
        case SIGHUP:
                log_message(LOG_FILE,"hangup signal catched");
        case SIGTERM:
                log_message(LOG_FILE,"terminate signal catched");

void daemonize()
int i,lfp;
char str[10];
        if(getppid()==1) return; /* already a daemon */
        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 */
        if (lfp<0) exit(1); /* can not open */
        if (lockf(lfp,F_TLOCK,0)<0) exit(0); /* can not lock */
        /* first instance continues */
        write(lfp,str,strlen(str)); /* record pid to lockfile */

        signal(SIGCHLD,SIG_IGN); /* ignore child */
        signal(SIGTSTP,SIG_IGN); /* ignore tty signals */
        signal(SIGHUP,signal_handler); /* catch hangup signal */
        signal(SIGTERM,signal_handler); /* catch kill signal */



        sleep(1); /* run */

it's work for daemon and how to programing for this daemon create log record every second (exampled.log)

log record data like this....


and loop count infinity

thank you for advanced.

Last edited by pludi; 03-12-2012 at 06:16 AM..
# 2  
Old 03-12-2012
static int  i;
    char *buf;
        buf = malloc(10*sizeof(char));

            sleep(1); /* run */

# 3  
Old 03-13-2012
thank you very much
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