posix_lock_file (9) Linux Manual Page
posix_lock_file – Apply a POSIX-style lock to a file
Synopsis
int posix_lock_file(struct file *filp, struct file_lock *fl, struct file_lock *conflock);Arguments
filp
-
- The file to apply the lock to
fl
- The lock to be applied
conflock
- Place to return a copy of the conflicting lock, if found.
Description
Add a POSIX style lock to a file. We merge adjacent & overlapping locks whenever possible. POSIX locks are sorted by owner task, then by starting address
Note that if called with an FL_EXISTS argument, the caller may determine whether or not a lock was successfully freed by testing the return value for -ENOENT.