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SYSLOG(3)		   Linux Programmer's Manual		     SYSLOG(3)

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

       #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

       closelog() closes the descriptor being used to write to the system log‐
       ger.  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 typi‐
       cally set to the program name.  The  option  argument  specifies	 flags
       which  control  the operation of openlog() and subsequent calls to sys‐
       log().  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  sys‐
       logd(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 dif‐
       ference 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.

       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 connec‐
		      tion is opened when the first message is logged).

       LOG_NOWAIT     Don't wait for child processes that may have  been  cre‐
		      ated 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.

       The  facility  argument is used to specify what type of program is log‐
       ging the message.  This lets the configuration file specify  that  mes‐
       sages 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 generated from user pro‐

       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

       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.

       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.

       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

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

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

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

       This  page  is  part of release 3.22 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2008-11-12			     SYSLOG(3)

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