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syslog()使用和例程

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通过在命令行中输入man openlog即可查阅相关文档；内容阐述得极为详尽，仔细阅读后便能充分理解其含义。

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    NAME
       closelog, openlog, syslog, vsyslog - send messages to the system logger
    
    SYNOPSIS
       #include <syslog.h>
    
       void openlog(const char *ident, int option, int facility);
       void syslog(int priority, const char *format, ...);
       void closelog(void);
    
       void vsyslog(int priority, const char *format, va_list ap);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
       vsyslog():
           Since glibc 2.19:
               _DEFAULT_SO

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