mirror of https://github.com/mkerrisk/man-pages
iopl.2: Minor tweaks to Thomas Piekarski's patch
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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man2/iopl.2
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man2/iopl.2
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@ -46,10 +46,11 @@ as specified by the two least significant bits in
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The I/O privilege level for a normal thread is 0.
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Permissions are inherited from parents to children.
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.PP
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This call is deprecated, significantly slower than
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.BR ioperm(2)
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This call is deprecated, is significantly slower than
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.BR ioperm (2),
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and is only provided for older X servers which require
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access to all 65536 I/O ports. It is mostly for the i386 architecture.
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access to all 65536 I/O ports.
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It is mostly for the i386 architecture.
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On many other architectures it does not exist or will always
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return an error.
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.SH RETURN VALUE
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@ -90,8 +91,8 @@ Avoid the latter, it is available on i386 only.
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Prior to Linux 5.5
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.BR iopl ()
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allowed the thread to disable interrupts while running
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at a higher I/O privilege level. This will probably crash
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the system, and is not recommended.
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at a higher I/O privilege level.
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This will probably crash the system, and is not recommended.
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.PP
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Prior to Linux 3.7,
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on some architectures (such as i386), permissions
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