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closelog (3)
  • closelog (3) ( FreeBSD man: Библиотечные вызовы )
  • closelog (3) ( Русские man: Библиотечные вызовы )
  • >> closelog (3) ( Linux man: Библиотечные вызовы )
  • closelog (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    closelog, openlog, syslog, vsyslog - send messages to the system logger
     
    

    SYNOPSIS

    #include <syslog.h>

    void openlog(const char *ident, int option, int facility);
    void syslog(int priority, const char *format, ...);
    void closelog(void);

    #include <stdarg.h>

    void vsyslog(int priority, const char *format, va_list ap);

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    vsyslog(): _BSD_SOURCE  

    DESCRIPTION

    closelog() 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 prepended to every message, and is typically set to the program name. The option argument specifies flags which control the operation of openlog() and subsequent calls to syslog(). The facility argument establishes a default to be used if none is specified in subsequent calls to syslog(). Values for option and facility are given below. 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). The priority argument is formed by ORing the facility and the level values (explained below). The remaining arguments are a format, as in printf(3) and any arguments required by the format, except that the two character sequence %m will be replaced by the error message string strerror(errno). A trailing newline may be added if needed.

    The function vsyslog() performs the same task as syslog() with the difference that it takes a set of arguments which have been obtained using the stdarg(3) variable argument list macros.

    The subsections below list the parameters used to set the values of option, facility, and priority.  

    option

    The option argument to openlog() is an OR of any of these:
    LOG_CONS
    Write directly to system console if there is an error while sending to system logger.
    LOG_NDELAY
    Open the connection immediately (normally, the connection is opened when the first message is logged).
    LOG_NOWAIT
    Don't wait for child processes that may have been created while logging the message. (The GNU C library does not create a child process, so this option has no effect on Linux.)
    LOG_ODELAY
    The converse of LOG_NDELAY; opening of the connection is delayed until syslog() is called. (This is the default, and need not be specified.)
    LOG_PERROR
    (Not in POSIX.1-2001.) Print to stderr as well.
    LOG_PID
    Include PID with each message.
     

    facility

    The 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.
    LOG_AUTH
    security/authorization messages (DEPRECATED Use LOG_AUTHPRIV instead)
    LOG_AUTHPRIV
    security/authorization messages (private)
    LOG_CRON
    clock daemon (cron and at)
    LOG_DAEMON
    system daemons without separate facility value
    LOG_FTP
    ftp daemon
    LOG_KERN
    kernel messages (these can't be generage from user processes)
    LOG_LOCAL0 through LOG_LOCAL7
    reserved for local use
    LOG_LPR
    line printer subsystem
    LOG_MAIL
    mail subsystem
    LOG_NEWS
    USENET news subsystem
    LOG_SYSLOG
    messages generated internally by syslogd(8)
    LOG_USER (default)
    generic user-level messages
    LOG_UUCP
    UUCP subsystem
     

    level

    This determines the importance of the message. The levels are, in order of decreasing importance:
    LOG_EMERG
    system is unusable
    LOG_ALERT
    action must be taken immediately
    LOG_CRIT
    critical conditions
    LOG_ERR
    error conditions
    LOG_WARNING
    warning conditions
    LOG_NOTICE
    normal, but significant, condition
    LOG_INFO
    informational message
    LOG_DEBUG
    debug-level message

    The function setlogmask(3) can be used to restrict logging to specified levels only.  

    CONFORMING TO

    The functions openlog(), closelog(), and syslog() (but not vsyslog()) are specified in SUSv2 and POSIX.1-2001. POSIX.1-2001 specifies only the LOG_USER and LOG_LOCAL* values for facility. However, with the exception of LOG_AUTHPRIV and LOG_FTP, the other facility values appear on most Unix systems. The LOG_PERROR value for option is not specified by POSIX.1-2001, but is available in most versions of Unix.  

    NOTES

    The argument ident in the call of openlog() is probably stored as-is. Thus, if the string it points to is changed, syslog() may start prepending the changed string, and if the string it points to ceases to exist, the results are undefined. Most portable is to use a string constant.

    Never pass a string with user-supplied data as a format, use the following instead:

    
        syslog(priority, "%s", string);
    
     

    SEE ALSO

    logger(1), setlogmask(3), syslog.conf(5), syslogd(8)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    option
    facility
    level
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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