06-16-2005
Quote:
Originally Posted by Javi
The command 'lsof' doesn't show the file that the 'vsftpd' process is writting. I get the same problem with 'fuser'.
I have made a C program that lock in exclusive mode the file. I thought that If I am able to lock the file then the file is not open by another process. But It doesn't work, the program is able to lock the file although the file is downloading.
The real problem appear to be that, nowhere in the Linux system reside information about the files than the vsftpd daemon is working with ...
Re paragraph 1: I find it very hard to believe that lsof can't do this. Your lsof could be broken, more more likely you are doing something wrong. Since you haven't mentioned stuff like precisely what command you used or precisely what result you got there's no way to tell. Could you take a bug report like: "'lsof' doesn't show the file" and do anything with it?
Re paragraph 2: "exclusive locks" are the only kind that exist. If you want a mandatory lock, read
mandatory.txt. But this won't help much. If you do it correctly, you will succeed, and vxftpd will experience failed writes. It will probably detect this and inform the ftp client of the error.
Re paragraph 3: I wonder how the data gets to the file?
I looked at the source code for vsftpd. I see it has a logging option. Turn that on and parse the log to see if the file is finished.
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FLOCK(1) H. Peter Anvin FLOCK(1)
NAME
flock - Manage locks from shell scripts
SYNOPSIS
flock [-sxon] [-w timeout] lockfile [-c] command...
flock [-sxon] [-w timeout] lockdir [-c] command...
flock [-sxun] [-w timeout] fd
DESCRIPTION
This utility manages flock(2) locks from within shell scripts or the command line.
The first and second forms wraps the lock around the executing a command, in a manner similar to su(1) or newgrp(1). It locks a specified
file or directory, which is created (assuming appropriate permissions), if it does not already exist.
The third form is convenient inside shell scripts, and is usually used the following manner:
(
flock -s 200
# ... commands executed under lock ...
) 200>/var/lock/mylockfile
The mode used to open the file doesn't matter to flock; using > or >> allows the lockfile to be created if it does not already exist, how-
ever, write permission is required; using < requires that the file already exists but only read permission is required.
By default, if the lock cannot be immediately acquired, flock waits until the lock is available.
OPTIONS
-s, --shared
Obtain a shared lock, sometimes called a read lock.
-x, -e, --exclusive
Obtain an exclusive lock, sometimes called a write lock. This is the default.
-u, --unlock
Drop a lock. This is usually not required, since a lock is automatically dropped when the file is closed. However, it may be
required in special cases, for example if the enclosed command group may have forked a background process which should not be hold-
ing the lock.
-n, --nb, --nonblock
Fail (with an exit code of 1) rather than wait if the lock cannot be immediately acquired.
-w, --wait, --timeout seconds
Fail (with an exit code of 1) if the lock cannot be acquired within seconds seconds. Decimal fractional values are allowed.
-o, --close
Close the file descriptor on which the lock is held before executing command. This is useful if command spawns a child process
which should not be hold ing the lock.
-c, --command command
Pass a single command to the shell with -c.
-h, --help
Print a help message.
AUTHOR
Written by H. Peter Anvin <hpa@zytor.com>.
COPYRIGHT
Copyright (C) 2003-2006 H. Peter Anvin.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
flock(2)
AVAILABILITY
The flock command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
flock utility 4 Feb 2006 FLOCK(1)