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#include <syslog.h>
The <syslog.h> header defines the following symbolic constants, zero or more of which can 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 following symbolic constants are defined as possible values of 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 following is declared as a macro for constructing the maskpri argument to setlogmask(). The following macro expands to an expression of type int when the argument pri is an expre ssion of type int:
LOG_MASK(pri)
a mask for priority pri
The following constants are defined as possible values for 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.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
syslog(3C), attributes(5), standards(5)