The I/O privilege level for a normal thread is 0.
Permissions are inherited from parents to children.
.PP
-This call is deprecated, significantly slower than
-.BR ioperm(2)
+This call is deprecated, is significantly slower than
+.BR ioperm (2),
and is only provided for older X servers which require
-access to all 65536 I/O ports. It is mostly for the i386 architecture.
+access to all 65536 I/O ports.
+It is mostly for the i386 architecture.
On many other architectures it does not exist or will always
return an error.
.SH RETURN VALUE
Prior to Linux 5.5
.BR iopl ()
allowed the thread to disable interrupts while running
-at a higher I/O privilege level. This will probably crash
-the system, and is not recommended.
+at a higher I/O privilege level.
+This will probably crash the system, and is not recommended.
.PP
Prior to Linux 3.7,
on some architectures (such as i386), permissions