syslog functions and Syslog configuration

syslog function prototypes

#include <syslog.h>

void Openlog (const char *ident, int option, int facility);

void syslog (int priority, const char *format, ...);

void Closelog (void);

#include <stdarg.h>

void Vsyslog (int priority, const char *format, va_list AP);

1#include <stdio.h>2#include <sys/types.h>3#include <unistd.h>4#include <signal.h>5#include <sys/param.h>6#include <sys/stat.h>7#include <time.h>8#include <syslog.h>9  Ten intInit_daemon (void)  One {  A   -     intpid; -     inti; the   -signal (sigttou,sig_ign); -signal (sigttin,sig_ign); -signal (sigtstp,sig_ign); +signal (sighup,sig_ign); -   +PID =fork (); A     if(PID >0)  at     {  -Exit0);//ends the parent process, making the child process a background process  -     }  -     Else if(PID <0)  -     {  -         return-1;  in     }  -     //set up a new process group, in which the child process becomes the first process in the process group so that the process is detached from all endpoints  toSetsid (); +     /*Create a new child process again, exit the parent process, ensure that the process is not the process leader, and that the process cannot open a new terminal*/  -PID =fork (); the     if(PID >0)  *     {  $Exit0); Panax Notoginseng     }  -     Else if(PID <0)  the     {  +         return-1;  A     }  the     /*Close any re-required file descriptors inherited from the parent process*/  +      for(i=0; i < Nofile; Close (i++));  -   $     /*change the working directory so that the process does not contact any file system*/  $ChDir"/");  -   -     /*Set the text screen Word to 0*/  the   -Umask0); Wuyi   the     /*mandatory slightly sigchld signal*/  -signal (sigchld,sig_ign); Wu     return 0;  - }  About   $   - intMain () - {  -time_t now; AInit_daemon (); +Syslog (log_user| Log_info,"Test Daemon! \ n");  the      while(1)  -     {  $Sleep8);  theTime (&Now );  theSyslog (log_user| Log_info,"system time: \t%s\t\t\n", CTime (&Now ));  the     }  the}

Note: Before using syslog, you need to first configure/etc/syslog.conf (/etc/rsyslog.conf in the Linux version) to add the last line of the file

User.*/var/log/test.log, and then restart the Syslog service with the following commands:/etc/init.d/syslog stop (or/etc/init.d/rsyslog stop)/etc/init.d/ Syslog start (or/etc/init.d/rsyslog start)

For syslog Configuration Please refer to the following information

Http://www.lvtao.net/server/linux-syslog.html

http://blog.csdn.net/needle2/article/details/6826523

　　

syslog functions and Syslog configuration