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Added JFT entries for handle 3 and 4 (I noticed the article says the first 5 are standard files, but only listed 0-2) |
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The '''Job File Table''' (JFT) is a [[DOS]] data structure in the [[Program Segment Prefix]] (PSP). It starts at PSP offset 0x18 and is 20 bytes long. For each open file handle, DOS stores the index into the [[System File Table]] (SFT). A file handle that is returned by <code>open</code>, <code>_open</code>, and other similar functions is simply an index into the JFT where DOS stored the SFT entry index for the file or device that the program opened.
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As of MS-DOS 3.30, the size of the JFT can be modified with a call to <code>INT 21h, 67h</code>.
==References==
<references />
[[Category:DOS technology]]
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