From owner-freebsd-questions  Thu Apr 22  9:23: 4 1999
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Subject: Two questions about newsyslog(8)
From: "Ronald F. Guilmette" <rfg@monkeys.com>
Date: Thu, 22 Apr 1999 09:34:21 -0700
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I have a couple of system log files that would benefit from the magic
performed by newsyslog(8), however I am concerned about trying to
employ this program on these specific log files, because the man page
for newsyslog(8) is not clear about a few important details of what
this program actually does.  Specifically:

     #1) When the current log file is being archived, is that current log
     file (simply renamed and then gzipped), or are its current contents
     copied first to `logfile.0', followed by truncation to zero length
     of the existing `logfile' file?

     (The answer to this question may perhaps make a BIG difference as
     to whether I can use newsyslog(8) or not on the specific log files
     I am concerned about.  If it just tries to rename `logfile' to
     `logfile.0' and if the daemon process that is writing the log file
     is just holding `logfile' continuously open, then this may perhaps
     not produce the desited results.)

     #2) The man page for newsyslog(8) says that it will send a signal
     to the daemon process that is writing the log file.  But when exactly
     will it do this?  What I mean is:  Does newsyslog(8) send the signal
     to the daemon process just after it makes a copy of (or just after
     it renames) the current log file?  Is the assumption then that this
     signal should cause the daemon to close the current logfile and open
     a new one having the original (pre-archiving) filename?

     

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