SYS_FLOCK(9) The Linux VFS SYS_FLOCK(9)NAMEsys_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.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 SYS_FLOCK(9)