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I can pump messages into with a syslogtag using the following from the command line using the -t option:

myprogram | logger -t MYTAG

And later filter based on that tag:

:syslogtag, contains, "MYTAG" /var/log/mylog

In the above example I am pumping stdout to the logger utility. However, I would like to push messages with that tag directly from myprogram to syslog but I can't seem to find anything related to adding tags in the syslog documentation.

Using the following call:

#include <syslog.h>
...
syslog(LOG_DAEMON | LOG_DEBUG, "mymessage");

The syslogtag simply ends up being:

syslog
0

Simple misunderstanding - before calling the syslog function I have to use the openlog function:

openlog("MYTAG", LOG_CONS | LOG_PID, LOG_DAEMON);

That does it!

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