syslog(3C) (man pages section 3: Basic Library Functions)
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`man pages section 3: Basic Library Functions
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`syslog(3C)
`NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | EXAMPLES | ATTRIBUTES | SEE ALSO
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`NAME
`syslog, openlog, closelog, setlogmask- control system log
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`SYNOPSIS
`#include <syslog.h>
`void openlog(const char *ident, int logopt, int facility);
`void syslog(int priority, const char *message, .../* arguments */);
`void closelog(void);
`int setlogmask(int maskpri);
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`DESCRIPTION
`The syslog() function sends a message to syslogd(1M), which, depending on the configuration of /etc/syslog.conf , logs it in an
`appropriate system log, writes it to the system console, forwards it to a list of users, or forwards it to syslogd on another host over the
`network. The logged message includes a message header and a message body. The message header consists of a facility indicator, a severity
`level indicator, a timestamp, a tag string, and optionally the process ID.
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`The message body is generated from the message and following arguments in the same manner as if these were arguments to printf(3UCB),
`except that occurrences of %m in the format string pointed to by the message argument are replaced by the error message string associated
`with the current value of errno . A trailing NEWLINE character is added if needed.
`Values of the priority argument are formed by ORing together a severity level value and an optional facility value. If no facility value is specified,
`the current default facility value is used.
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`Possible values of severity level include:
`LOG_EMERG
`A panic condition. This is normally broadcast to all users.
`LOG_ALERT
`A condition that should be corrected immediately, such as a corrupted system database.
`LOG_CRIT
`Critical conditions, such as hard device errors.
`LOG_ERR
`Errors.
`LOG_WARNING
`Warning messages.
`LOG_NOTICE
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`https://docs.oracle.com/cd/E19683-01/816-0213/6m6ne38de/index.html
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`syslog(3C) (man pages section 3: Basic Library Functions)
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`Conditions that are not error conditions, but that may require special handling.
`LOG_INFO
`Informational messages.
`LOG_DEBUG
`Messages that contain information normally of use only when debugging a program.
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`The facility indicates the application or system component generating the message. Possible facility values include:
`LOG_KERN
`Messages generated by the kernel. These cannot be generated by any user processes.
`LOG_USER
`Messages generated by random user processes. This is the default facility identifier if none is specified.
`LOG_MAIL
`The mail system.
`LOG_DAEMON
`System daemons, such as in.ftpd(1M).
`LOG_AUTH
`The authorization system: login(1), su(1M), getty(1M).
`LOG_LPR
`The line printer spooling system: lpr(1B), lpc(1B).
`LOG_NEWS
`Reserved for the USENET network news system.
`LOG_UUCP
`Reserved for the UUCP system; it does not currently use syslog .
`LOG_CRON
`The cron / at facility; crontab(1), at(1), cron(1M).
`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
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`syslog(3C) (man pages section 3: Basic Library Functions)
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`Reserved for local use.
`The openlog() function sets process attributes that affect subsequent calls to syslog() . The ident argument is a string that is prepended
`to every message. The logopt argument indicates logging options. Values for logopt are constructed by a bitwise-inclusive OR of zero or more of
`the following:
`LOG_PID
`Log the process ID with each message. This is useful for identifying specific daemon processes (for daemons that fork).
`LOG_CONS
`Write messages to the system console if they cannot be sent to syslogd(1M). This option is safe to use in daemon processes that have
`no controlling terminal, since syslog() forks before opening the console.
`LOG_NDELAY
`Open the connection to syslogd(1M) immediately. Normally the open is delayed until the first message is logged. This is useful for
`programs that need to manage the order in which file descriptors are allocated.
`LOG_ODELAY
`Delay open until syslog() is called.
`LOG_NOWAIT
`Do not wait for child processes that have been forked to log messages onto the console. This option should be used by processes that
`enable notification of child termination using SIGCHLD , since syslog() may otherwise block waiting for a child whose exit status
`has already been collected.
`
`The facility argument encodes a default facility to be assigned to all messages that do not have an explicit facility already encoded. The initial
`default facility is LOG_USER .
`The openlog() and syslog() functions may allocate a file descriptor. It is not necessary to call openlog() prior to calling syslog
`() .
`The closelog() function closes any open file descriptors allocated by previous calls to openlog() or syslog() .
`The setlogmask() function sets the log priority mask for the current process to maskpri and returns the previous mask. If the maskpri
`argument is 0, the current log mask is not modified. Calls by the current process to syslog() with a priority not set in maskpri are rejected.
`The mask for an individual priority pri is calculated by the macro LOG_MASK(pri) ; the mask for all priorities up to and including toppri is given
`by the macro LOG_UPT(toppri) . The default log mask allows all priorities to be logged.
`Symbolic constants for use as values of the logopt, facility, priority, and maskpri arguments are defined in the < syslog.h > header.
`
`RETURN VALUES
`The setlogmask() function returns the previous log priority mask. The closelog() , openlog() and syslog() functions return no
`value.
`
`ERRORS
`No errors are defined.
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`EXAMPLES
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`Example 1 Example of LOG_ALERT message.
`
`This call logs a message at priority LOG_ALERT :
`
`syslog(LOG_ALERT, "who: internal error 23") ;
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`The FTP daemon ftpd would make this call to openlog() to indicate that all messages it logs should have an identifying string of ftpd ,
`should be treated by syslogd(1M) as other messages from system daemons are, should include the process ID of the process logging the
`message:
`
`openlog("ftpd", LOG_PID, LOG_DAEMON) ;
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`https://docs.oracle.com/cd/E19683-01/816-0213/6m6ne38de/index.html
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`syslog(3C) (man pages section 3: Basic Library Functions)
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`Then it would make the following call to setlogmask() to indicate that messages at priorities from LOG_EMERG through LOG_ERR should
`be logged, but that no messages at any other priority should be logged:
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`setlogmask(LOG_UPTO(LOG_ERR)) ;
`
`Then, to log a message at priority LOG_INFO , it would make the following call to syslog :
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`syslog(LOG_INFO, "Connection from host %d", CallingHost) ;
`
`A locally-written utility could use the following call to syslog() to log a message at priority LOG_INFO to be treated by syslogd(1M) as other
`messages to the facility LOG_LOCAL2 are:
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`syslog(LOG_INFO|LOG_LOCAL2, "error: %m") ;
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`ATTRIBUTES
`See attributes(5) for descriptions of the following attributes:
`
` ATTRIBUTE TYPE
`
` ATTRIBUTE VALUE
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` MT-Level
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` Safe
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`SEE ALSO
`at(1), crontab(1), logger(1), login(1), lpc(1B), lpr(1B), cron(1M), getty(1M), in.ftpd(1M), su(1M), syslogd(1M), printf(3UCB), syslog.conf(4),
`attributes(5)
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`SunOS 5.9 Last Revised 29 Dec 1996
`
`NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | EXAMPLES | ATTRIBUTES | SEE ALSO
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`© 2010, Oracle Corporation and/or its affiliates
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`https://docs.oracle.com/cd/E19683-01/816-0213/6m6ne38de/index.html
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`9/18/2015
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