At 03:29 AM 8/6/2008, Matthew Woodcraft wrote:
In article <[EMAIL PROTECTED]>,
> How do I redirect ALL stderr stuff to syslog, even stderr from
> external programs that don't explicitly change their own stderr?
Sending messages to syslog involves more than writing to a file
descriptor, so there's no way to make this happen without having some
process read the external programs' output and send it to syslog (which
is basically the 'logger' method that you said you didn't like).
I actually don't mind resorting to logger, I just don't want to wrap
the python program in a shell script.
Anyway the following appears to work, not sure if there are any
gotchas (I'm new to this).
(a,b)=popen2.popen2('/bin/logger -t "test[%u]: STDERR"' % os.getpid())
os.dup2(b.fileno(),sys.stderr.fileno())
(a,b1)=popen2.popen2('/bin/logger -t "test[%u]: STDOUT"' % os.getpid())
os.dup2(b1.fileno(),sys.stdout.fileno())
It seems subprocess is to be preferred over popen2. subprocess is
more verbose for this.
With perl I normally do (close your eyes if you are allergic to perl :) ):
open(STDERR,"|/bin/logger -t \"${PROGNAME}[$$]: STDERR\"") or die
"Error: Unable to redirect STDERR to logger!";
open(STDOUT,"|/bin/logger -t \"${PROGNAME}[$$]: STDOUT\"") or die
"Error: Unable to redirect STDOUT to logger!";
You'd do that with something like this (untested):
STDERR = 2
se = os.open("breakage.log", os.O_WRONLY|os.O_APPEND)
os.dup2(se, STDERR)
os.close(se)
You can also use this breakage log for errors from your own program, if
there are any cases where you think things might be too messed up for
you to want to rely on your normal logging routines.
I've seen that but rejected it because it will not provide
timestamps, and the logs end up in different places - some to syslog
and some to this file.
Having the logs go to the same place also gives a hint on the order
of events - it's not 100% in order of course, but usually good
enough, and much better than not even knowing what hour each line occurred.
Regards,
Link.
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