.TH "sys_flock" 9 "sys_flock" "25 May 1998" "Kernel Hacker's Manual" LINUX
.SH NAME
sys_flock \-  flock() system call.
.SH SYNOPSIS
.B "asmlinkage long" sys_flock
.BI "(unsigned int " fd ","
.BI "unsigned int " cmd ");"
.SH ARGUMENTS
.IP "fd" 12
 the file descriptor to lock.
.IP "cmd" 12
 the type of lock to apply.
.SH "DESCRIPTION"
Apply a FL_FLOCK style lock to an open file descriptor.
The \fIcmd\fP 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.