syslog.h
Section: POSIX Programmer's Manual (0P)
Updated: 2017
Page Index
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
syslog.h
--- definitions for system error logging
SYNOPSIS
#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
The System Interfaces volume of POSIX.1-2017,
closelog()
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .