__fsetlocking - Linux
Overview
__fsetlocking is a powerful Linux command used to set file locking options. It allows fine-grained control over file locking behavior, providing robust data integrity and preventing concurrent access conflicts.
Syntax
__fsetlocking [OPTIONS] FILE
Options/Flags
- -l: Lock the file.
- -u: Unlock the file.
- -s: Share the lock with other processes.
- -e: Exclusive lock; prevent other processes from accessing the file.
- -n: Non-blocking lock; return immediately with an error if the lock cannot be acquired.
- -t: Timeout; wait for the specified number of seconds before returning with an error if the lock cannot be acquired.
Examples
Acquire an exclusive lock:
sudo __fsetlocking -e test.txt
Unlock the file:
sudo __fsetlocking -u test.txt
Share the lock with other processes:
sudo __fsetlocking -s test.txt
Non-blocking lock with a 5-second timeout:
sudo __fsetlocking -n -t 5 test.txt
Common Issues
- Permission denied: Ensure that you have sufficient permissions to modify the file.
- File already locked: Another process may have already locked the file. Try waiting or using the
-n
flag. - Invalid argument: Verify that you have specified valid options and arguments.
Integration
flock: Use __fsetlocking to control file locking in a script or command pipeline using the flock
command.
Related Commands
lsof
: List open files and their locks.fsync
: Flush data and metadata to disk.chattr
: Change file attributes, including locking.