openlog() opens a connection to the system logger for a program.
The string ident is added to each message.
The option argument is used to indicate what logging options will be used when generating a log message.
|if there is an error while sending data to the system logger, write directly to the system console|
|open the connection to the logger immediately|
|(default) delay opening the connection until the first message is logged|
|print log message also to standard error|
|include PID with each message|
You can use one or more of this options. When using multiple options you need to
OR them, i.e. to open the connection
immediately, write to the console and include the PID in each message,
you will use:
LOG_CONS | LOG_NDELAY | LOG_PID
The facility argument is used to specify what type of program is logging the message. This allows you to specify (in your machine's syslog configuration) how messages coming from different facilities will be handled.
security/authorization messages (use
|security/authorization messages (private)|
|clock daemon (cron and at)|
|other system daemons|
|reserved for local use, these are not available in Windows|
|line printer subsystem|
|USENET news subsystem|
|messages generated internally by syslogd|
|generic user-level messages|
LOG_USER is the only valid log type under Windows