The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> syslog.h - definitions for system error logging

#### SYNOPSIS

> `[XSI] #include <syslog.h>`

#### DESCRIPTION

> The <syslog.h> header shall define the following symbolic constants, zero or more of which may be OR'ed together to form the logopt option of openlog():

> LOG_PID
>   Log the process ID with each message.
> LOG_CONS
>   Log to the system console on error.
> LOG_NDELAY
>   Connect to syslog daemon immediately.
> LOG_ODELAY
>   Delay open until syslog() is called.
> LOG_NOWAIT
>   Do not wait for child processes.

> The <syslog.h> header shall define the following symbolic constants for use as the facility argument to openlog():

> LOG_KERN
>   Reserved for message generated by the system.
> LOG_USER
>   Message generated by a process.
> LOG_MAIL
>   Reserved for message generated by mail system.
> LOG_NEWS
>   Reserved for message generated by news system.
> LOG_UUCP
>   Reserved for message generated by UUCP system.
> LOG_DAEMON
>   Reserved for message generated by system daemon.
> LOG_AUTH
>   Reserved for message generated by authorization daemon.
> LOG_CRON
>   Reserved for message generated by clock daemon.
> LOG_LPR
>   Reserved for message generated by printer system.
> LOG_LOCAL0
>   Reserved for local use.
> LOG_LOCAL1
>   Reserved for local use.
> LOG_LOCAL2
>   Reserved for local use.
> LOG_LOCAL3
>   Reserved for local use.
> LOG_LOCAL4
>   Reserved for local use.
> LOG_LOCAL5
>   Reserved for local use.
> LOG_LOCAL6
>   Reserved for local use.
> LOG_LOCAL7
>   Reserved for local use.

> The <syslog.h> header shall define the following macros for constructing the maskpri argument to setlogmask(). The following macros expand to an expression of type int when the argument pri is an expression of type int:

> LOG_MASK(pri)
>   A mask for priority pri.

> The <syslog.h> header shall define the following symbolic constants for use as the priority argument of syslog():

> LOG_EMERG
>   A panic condition was reported to all processes.
> LOG_ALERT
>   A condition that should be corrected immediately.
> LOG_CRIT
>   A critical condition.
> LOG_ERR
>   An error message.
> LOG_WARNING
>   A warning message.
> LOG_NOTICE
>   A condition requiring special handling.
> LOG_INFO
>   A general information message.
> LOG_DEBUG
>   A message useful for debugging programs.

> The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

>     void  closelog(void);
>     void  openlog(const char *, int, int);
>     int   setlogmask(int);
>     void  syslog(int, const char *, ...);

The following sections are informative.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> XSH closelog

#### CHANGE HISTORY

> First released in Issue 4, Version 2.

#### Issue 5

> Moved from X/Open UNIX to BASE.

#### Issue 7

> This reference page is clarified with respect to macros and symbolic constants.

End of informative text.

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