syslog - definitions for system error logging
#include <syslog.h>
The <syslog.h> header defines 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
- Don't 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 authorisation daemon.
- LOG_CRON
- Reserved for message generated by the 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 are declared as 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 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.
The following are declared as functions and may also be defined as macros. Function prototypes must be provided for use with an ISO C compiler.
void closelog(void); void openlog(const char *, int, int); int setlogmask(int); void syslog(int, const char *, ...);
None.
None.
closelog().