closelog(关闭信息记录)

#include <syslog.h>
void closelog(void);

openlog(准备做信息记录)

#include <syslog.h>
void openlog(const char *ident, int option, int facility);

syslog(将信息记录至系统日志文件)

#include <syslog.h>
void syslog(int priority, const char *format, ...);