posix_lock_file (9) - Linux Manuals

posix_lock_file: Apply a POSIX-style lock to a file

Command to display posix_lock_file manual in Linux: $ man 9 posix_lock_file

NAME

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

: 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.