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Manpages SYSLOGSection: Linux Programmer's Manual (3)Updated: 1999-12-19 Index Return to Main Contents NAMEcloselog, openlog, syslog - send messages to the system loggerSYNOPSIS#include <syslog.h>void openlog( char *ident, int option, int facility) void syslog( int priority, char *format, ...) void closelog( void ) DESCRIPTIONcloselog() closes the descriptor being used to write to the system logger. The use of closelog() is optional.openlog() opens a connection to the system logger for a program. The string pointed to by ident is added to each message, and is typically set to the program name. Values for option and facility are given in the next section. The use of openlog() is optional; It will automatically be called by syslog() if necessary, in which case ident will default to NULL. syslog() generates a log message, which will be distributed by syslogd(8). priority is a combination of the facility and the level, values for which are given in the next section. The remaining arguments are a format, as in printf(3) and any arguments required by the format, except that the two character %m will be replaced by the error message string (strerror) corresponding to the present value of errno. PARAMETERSThis section lists the parameters used to set the values of option, facility, and priority.optionThe option argument to openlog() is an OR of any of these:
facilityThe facility argument is used to specify what type of program is logging the message. This lets the configuration file specify that messages from different facilities will be handled differently.
levelThis determines the importance of the message. The levels are, in order of decreasing importance:
HISTORYA syslog function call appeared in BSD 4.2.SEE ALSOlogger(1), syslog.conf(5), syslogd(8)
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