Re: Need logging facilities

On Fri, Jan 24, 2003 at 09:26:19AM -0500, Greg Ward wrote:
 Huh? Pardon my ignorance, but I thought the whole point of Unix'
 append mode was to avoid this -- ie. I thought that the kernel always
 guarantees you're at eof when you write() to a file opened with
 O_APPEND.

open(2) on Linux says:

       O_APPEND
              The file is opened in append mode. Before each write, the file
              pointer is positioned at the end of the file, as if with lseek.
              O_APPEND may lead to corrupted files on NFS file systems if more
              than one process appends data to a file at once. This is
              because NFS does not support appending to a file, so the client
              kernel has to simulate it, which can't be done without a race
              condition.

So, you're horked for NFS at least.

-- 
Edward S. Marshall esm@logic.net
http://esm.logic.net/
Felix qui potuit rerum cognoscere causas.
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