The Open Group Base Specifications Issue 8
IEEE Std 1003.1-2024
Copyright © 2001-2024 The IEEE and The Open Group

NAME

syslog.h — definitions for system error logging

SYNOPSIS

[XSI] [Option Start] #include <syslog.h> [Option End]

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.
LOG_UPTO(pri)
A mask for all priorities from LOG_EMERG through pri inclusive in the order listed in the list of priority symbolic constants below. Any additional implementation-defined priorities not included in the list below shall not be included in the mask.

The <syslog.h> header shall define the following symbolic constants for use as the severity level portion of the priority argument of syslog() and the pri argument of the LOG_MASK(pri) and LOG_UPTO(pri) macros:

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.

Issue 8

Austin Group Defect 1033 is applied, adding the LOG_UPTO macro.

End of informative text.

 

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