08-25-2010
Quote:
Originally Posted by
rjhjr64
I used the "cat /dev/null > filename", and also tryed vi'ing the file and deleting contents with ":g/.*/d". Both seemed to work, inasmuch as deleting the contents; just won't get it back to a zero-size file (in the log's "live" environment). Thanks
Corona688 is right here. You will need to force the process to close and reopen the file.
When you redirect output onto the existing file (>logfile or cat /dev/null >logfile) you are causing the file to be unlinked from the filesystem, but if any processes still have an open file descriptor to the file, the disk space is not released and the process will continue to see the file that it has been using all along. This is why you see an empty file in the file system (reported by ls) but the space is still used (reported by du/df) and the application still has issues.
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LEARN ABOUT OPENDARWIN
mount_fdesc
MOUNT_FDESC(8) BSD System Manager's Manual MOUNT_FDESC(8)
NAME
mount_fdesc -- mount the file-descriptor file system
SYNOPSIS
mount_fdesc [-o options] fdesc mount_point
DESCRIPTION
The mount_fdesc command attaches an instance of the per-process file descriptor namespace to the global filesystem namespace. The conven-
tional mount point is /dev and the filesystem should be union mounted in order to augment, rather than replace, the existing entries in /dev.
This command is normally executed by mount(8) at boot time.
The options are as follows:
-o Options are specified with a -o flag followed by a comma separated string of options. See the mount(8) man page for possible options
and their meanings.
The contents of the mount point are fd, stderr, stdin, stdout and tty.
fd is a directory whose contents appear as a list of numbered files which correspond to the open files of the process reading the directory.
The files /dev/fd/0 through /dev/fd/# refer to file descriptors which can be accessed through the file system. If the file descriptor is
open and the mode the file is being opened with is a subset of the mode of the existing descriptor, the call:
fd = open("/dev/fd/0", mode);
and the call:
fd = fcntl(0, F_DUPFD, 0);
are equivalent.
The files /dev/stdin, /dev/stdout and /dev/stderr appear as symlinks to the relevant entry in the /dev/fd sub-directory. Opening them is
equivalent to the following calls:
fd = fcntl(STDIN_FILENO, F_DUPFD, 0);
fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are ignored.
The /dev/tty entry is an indirect reference to the current process's controlling terminal. It appears as a named pipe (FIFO) but behaves in
exactly the same way as the real controlling terminal device.
FILES
/dev/fd/#
/dev/stdin
/dev/stdout
/dev/stderr
/dev/tty
SEE ALSO
mount(2), unmount(2), tty(4), fstab(5), mount(8)
CAVEATS
No ~. and .. entries appear when listing the contents of the /dev/fd directory. This makes sense in the context of this filesystem, but is
inconsistent with usual filesystem conventions. However, it is still possible to refer to both ~. and .. in a pathname.
This filesystem may not be NFS-exported.
HISTORY
The mount_fdesc utility first appeared in 4.4BSD.
4.4BSD March 27, 1994 4.4BSD