syslog.h
definitions for system error logging
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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.1‐2008, closelog()
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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 .