openlog()

Updated: May 06, 2022

Open the syslogd system log

Synopsis:

#include <syslog.h>

void openlog( const char * ident, 
              int logopt, 
              int facility );

Arguments:

ident
A string that you want to prepend to every message.
logopt
A bit field specifying logging options; a combination of one or more of the following values with an OR operation:
LOG_CONS
If syslog() can't pass the message to syslogd, it attempts to write the message to the /dev/console device. The /dev/console device is usually a symlink (see the ln command) to a real device (e.g., /dev/text, /dev/con1, or /dev/ser1).

(QNX Neutrino 7.0 or later) You can also use this flag to redirect syslogd output to slogger2.

LOG_NDELAY
Open the connection to syslogd immediately. Normally the opening is delayed until the first message is logged.
LOG_PERROR
Write the message to standard error output as well to the system log.
LOG_PID
Log the process ID with each message. This is useful for identifying instantiations of daemons.
facility
Encode a default facility to be assigned to all messages that don't have an explicit facility encoded. In the following list, parameter values marked with an asterisk (*) aren't used by any of the QNX Neutrino standard utilities.
LOG_AUTH *
Authorization system.
LOG_AUTHPRIV *
Same as LOG_AUTH, but logged to a file readable only by selected individuals.
LOG_CRON *
Clock daemon.
LOG_DAEMON
System daemons (such as routed) that aren't explicitly provided for by other facilities.
LOG_FTP
File transfer protocol daemon.
LOG_KERN *
Messages generated by the kernel. These can't be generated by any user processes.
LOG_LPR
Line printer spooling system.
LOG_MAIL
Mail system.
LOG_NEWS *
Network news system.
LOG_SYSLOG
Messages generated internally by syslogd.
LOG_USER*
Messages generated by random user processes. This is the default facility identifier if none is specified.
LOG_UUCP *
The UUCP system.
LOG_LOCAL0 through LOG_LOCAL7 *
Reserved for local use.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The openlog() function opens the syslogd system log and provides for more specialized processing of the messages sent by syslog() and vsyslog().

Examples:

See syslog().

Classification:

POSIX 1003.1

Safety:  
Cancellation point Yes
Interrupt handler No
Signal handler No
Thread Yes