SYS_FLOCK(9)                              The Linux VFS                              SYS_FLOCK(9)



NAME
       sys_flock - flock system call.

SYNOPSIS
       long sys_flock(unsigned int fd, unsigned int cmd);

ARGUMENTS
       fd
           the file descriptor to lock.

       cmd
           the type of lock to apply.

DESCRIPTION
       Apply a FL_FLOCK style lock to an open file descriptor. The cmd can be one of

       LOCK_SH -- a shared lock.

       LOCK_EX -- an exclusive lock.

       LOCK_UN -- remove an existing lock.

       LOCK_MAND -- a `mandatory' flock. This exists to emulate Windows Share Modes.

       LOCK_MAND can be combined with LOCK_READ or LOCK_WRITE to allow other processes read and
       write access respectively.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                              SYS_FLOCK(9)