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<TITLE>Int 21/AH=5Ch
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Int 21/AH=5Ch - DOS 3.0+ - FLOCK - RECORD LOCKING -
AH = 5Ch
AL = subfunction
00h lock region of file
01h unlock region of file
BX = file handle
CX:DX = start offset of region within file
SI:DI = length of region in bytes
Return: CF clear if successful
CF set on error
AX = error code (01h,06h,21h,24h) (see #01680)
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<h2>Int 21/AH=5Ch
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<h3><font color=#C00040>DOS 3.0+ - FLOCK - RECORD LOCKING</font></h3>
<PRE>
AH = 5Ch
AL = subfunction
00h lock region of file
01h unlock region of file
BX = file handle
CX:DX = start offset of region within file
SI:DI = length of region in bytes<br>
<p><b>Return:</b><br>CF clear if successful
CF set on error
AX = error code (01h,06h,21h,24h) <a href="rb-3012.htm#Table1680" tppabs="http://www.ctyme.com/intr/rb-3012.htm#Table1680">(see #01680)</a>
</PRE>
<p><b>Notes:</b>
Error returned unless SHARE or network installed.
An unlock call must specify the same region as some prior lock call.
Locked regions become entirely inaccessible to other processes.
Duplicate handles created with AH=45h or AH=46h inherit locks, but
handles inherited by child processes (see AH=4Bh) do not.
Under DR DOS 3.41 and 5.0, if a process opens a file without the no-
inherit flag and then starts a child, any locks set by the parent
are ignored, and the child will only get an error if it tries to
lock an area previously locked by the parent process. Under Novell
DOS 7, this function is fully supported as in MS-DOS.
<p><b>See Also:</b>
<a href="rb-2893.htm" tppabs="http://www.ctyme.com/intr/rb-2893.htm">AX=440Bh</a> - <a href="rb-3324.htm" tppabs="http://www.ctyme.com/intr/rb-3324.htm">AH=BCh</a> - <a href="rb-3326.htm" tppabs="http://www.ctyme.com/intr/rb-3326.htm">AH=BEh</a> - <a href="rb-4314.htm" tppabs="http://www.ctyme.com/intr/rb-4314.htm">INT 2F/AX=110Ah</a
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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