#include<syslog.h>
syslog(LOG_INFO, "Start logging");
The above syslog command is not logging in the syslog. So I tried,
openlog("Logs", "", LOG_USER);
syslog(LOG_INFO, "Start logging");
closelog();
This fails to log anything and I get the following error:
syslog: unknown facility/priority: 8049584
Answer
This line is wrong:
openlog("vyatta-conntrack", "", LOG_USER);
The "" should have been an integer:
void openlog(const char *ident, int option, int facility);
The integer should be any of these constants ORed together:
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.
Try again with something more like:
openlog("vyatta-conntrack", LOG_PID, LOG_USER);
Note that your syslogd configuration might not be set up to keep messages of log level LOG_INFO. Try LOG_ALERT or something for debugging this problem -- if it works, then drop back to LOG_INFO and configure your syslogd to keep the log messages that you want to keep. Adding a line like:
*.* /var/log/all_messages.log
will do the job for rsyslogd(8). Be sure to read the rsyslog.conf(5) manpage if your system uses rsyslogd(8). If your system uses a different syslog daemon, then check your system's manpages for details.