Question: how to specify logging filenames? about google-glog HOT 9 CLOSED

If you want to change the destination directory, you can use --log_dir (or 
GLOG_log_dir if you don't have gflags installed). If you want to change the 
name of 
log files, you may need to call SetLogDestination():

  google::SetLogDestination(google::INFO, "/var/tmp/another_destination.INFO");

I don't know how to use --GLOG_log_dir. But SetLogDestination() works.
Thank you.

One can also try setting the GOOGLE_LOG_DIR environment variable to point to a
directory of choice.

Is it safe to direct different log levels to the same log file in a 
multithreaded 
application?

google::SetLogDestination(google::INFO, "/var/tmp/applog.log");
google::SetLogDestination(google::WARNING, "/var/tmp/applog.log");
google::SetLogDestination(google::ERROR, "/var/tmp/applog.log");

Thanks!

Actually, while trying to set to the same log file as mentioned above, I got 
runtime 
error as the following...

Could not create log file: File exists
COULD NOT CREATE LOGFILE '20100519-094242.22838'!

The reason I want to put them in the the same file is that I want to check the 
events sequence according to the timestamps.

INFO log file should have all log levels. Isn't it sufficient?

http://google-glog.googlecode.com/svn/trunk/doc/glog.html#severity

Note that messages of a given severity are logged not only in the logfile for 
that 
severity, but also in all logfiles of lower severity. E.g., a message of 
severity 
FATAL will be logged to the logfiles of severity FATAL, ERROR, WARNING, and 
INFO.

Yes, that is good enough. I did not read carefully.
Now while I am reading the INFO log carefully I do see Warnings and Errors.

Thanks and keep up the good work!

I really appreciate the smart robust and clean glog library.
I was fed up with the issues other c++ logging libraries.
I will would have been much happier if you guys would have given the better 
documentation.