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           #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.  If ident is NULL, the program name is
           used.  (POSIX.1-2008 does not specify the behavior when ident is NULL.)
           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  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-
           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
           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
           able 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), syslog.conf(5), syslogd(8)

    Linux 2012-08-17 SYSLOG(3)


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