Category: <strong>DOS kernel</strong>
<p>
<pre><strong>INT 21 - DOS 2+ - "LSEEK" - SET CURRENT FILE POSITION</strong>
	AH = 42h
	AL = origin of move
	 00h start of file
	 01h current file position
	 02h end of file
	BX = file handle
	CX:DX = (signed) offset from origin of new file position
Return: CF clear if successful
	 DX:AX = new file position in bytes from start of file
	CF set on error
	 AX = error code (01h,06h) (see <a href="/index.cgi/speech/http://www.delorie.com/djgpp/doc/rbinter/id/10/../../it/80/16.html">#01680</a> at AH=59h/BX=0000h)
Notes:	for origins 01h and 02h, the pointer may be positioned before the
	 start of the file; no error is returned in that case (except under
	 Windows NT), but subsequent attempts at I/O will produce errors
	if the new position is beyond the current end of file, the file will
	 be extended by the next write (see AH=40h); for FAT32 drives, the
	 file must have been opened with AX=6C00h with the "extended size"
	 flag in order to expand the file beyond 2GB
BUG:	using this method to grow a file from zero bytes to a very large size
	 can corrupt the FAT in some versions of DOS; the file should first
	 be grown from zero to one byte and then to the desired large size
SeeAlso: AH=24h,INT 2F/AX=1228h
</pre>
</div><div class="naked_ctrl">
<form action="/index.cgi/speech" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="http://www.delorie.com/djgpp/doc/rbinter/id/10/28.html">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="http://www.delorie.com/djgpp/doc/rbinter/id/10/28.html" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech" selected="selected">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>