vfs_test_lock(9) centos man page | unix.com

VFS_TEST_LOCK(9)						   The Linux VFS						  VFS_TEST_LOCK(9)

NAME
       vfs_test_lock - test file byte range lock

SYNOPSIS
       int vfs_test_lock(struct file * filp, struct file_lock * fl);

ARGUMENTS
       filp
	   The file to test lock for

       fl
	   The lock to test; also used to hold result

DESCRIPTION
       Returns -ERRNO on failure. Indicates presence of conflicting lock by setting conf->fl_type to something other than F_UNLCK.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  VFS_TEST_LOCK(9)