<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <HTML ><HEAD ><TITLE >sys_flock</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="The Linux Kernel API" HREF="book1.html"><LINK REL="UP" TITLE="File Locks" HREF="x4323.html"><LINK REL="PREVIOUS" TITLE="fcntl_setlease" HREF="r4610.html"><LINK REL="NEXT" TITLE="get_locks_status" HREF="r4699.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Linux Kernel API</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="r4610.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="r4699.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="AEN4651" ></A ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >sys_flock</SPAN ></SPAN ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN4655" ></A ><H2 >Name</H2 >sys_flock -- <TT CLASS="FUNCTION" >flock</TT > system call. </DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN4659" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN4661" ></A ><P ></P ><P ><CODE ><CODE CLASS="FUNCDEF" >asmlinkage long <TT CLASS="FUNCTION" >sys_flock </TT ></CODE >(unsigned int <TT CLASS="PARAMETER" ><I >fd</I ></TT >, unsigned int <TT CLASS="PARAMETER" ><I >cmd</I ></TT >);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4669" ></A ><H2 >Arguments</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="PARAMETER" ><I >fd</I ></TT ></DT ><DD ><P > the file descriptor to lock. </P ></DD ><DT ><TT CLASS="PARAMETER" ><I >cmd</I ></TT ></DT ><DD ><P > the type of lock to apply. </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4682" ></A ><H2 >Description</H2 ><P > Apply a <TT CLASS="CONSTANT" >FL_FLOCK</TT > style lock to an open file descriptor. The <TT CLASS="PARAMETER" ><I >cmd</I ></TT > can be one of </P ><P > <TT CLASS="CONSTANT" >LOCK_SH</TT > -- a shared lock. </P ><P > <TT CLASS="CONSTANT" >LOCK_EX</TT > -- an exclusive lock. </P ><P > <TT CLASS="CONSTANT" >LOCK_UN</TT > -- remove an existing lock. </P ><P > <TT CLASS="CONSTANT" >LOCK_MAND</TT > -- a `mandatory' flock. This exists to emulate Windows Share Modes. </P ><P > <TT CLASS="CONSTANT" >LOCK_MAND</TT > can be combined with <TT CLASS="CONSTANT" >LOCK_READ</TT > or <TT CLASS="CONSTANT" >LOCK_WRITE</TT > to allow other processes read and write access respectively. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="r4610.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="book1.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="r4699.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >fcntl_setlease</SPAN ></SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="x4323.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >get_locks_status</SPAN ></SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >