linux-support 0.0.25

Comprehensive Linux support for namespaces, cgroups, processes, scheduling, parsing /proc, parsing /sys, signals, hyper threads, CPUS, NUMA nodes, unusual file descriptors, PCI devices and much, much more
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

// This file is part of linux-support. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/linux-support/master/COPYRIGHT. No part of linux-support, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2020 The developers of linux-support. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/linux-support/master/COPYRIGHT.


/// Remove I/O port permissions.
///
/// Ports above 0x3FF might not be supported.
///
/// If `enable` is `true` then the calling thread must have the `CAP_SYS_RAWIO` capability.
#[cfg(not(target_arch = "powerpc64"))]
#[inline(always)]
fn set_ioport_permissions(range: RangeInclusive<u16>, enable: bool) -> Result<(), &'static str>
{
	let start = *range.start() as u64;
	let end = *range.end() as u64;
	let result = unsafe { ioperm(start, end - start + 1, enable as i32) };
	if likely!(result == 0)
	{
		Ok(())
	}
	else if likely!(result == -1)
	{
		match errno().0
		{
			EINVAL => Err("Invalid values for from or num"),
			EPERM => Err("The calling thread has insufficient privilege"),
			ENOMEM => panic!("Out of memory"),

			unexpected @ _ => panic!("Unexpected error {} from ioperm()", unexpected),
		}
	}
	else
	{
		unreachable_code(format_args!("Unexpected result {} from ioperm()", result))
	}
}