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
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// 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.


/// A cgroup name.
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[derive(Deserialize, Serialize)]
#[repr(transparent)]
pub struct CgroupName(OsString);

impl TryFrom<OsString> for CgroupName
{
	type Error = &'static str;
	
	#[inline(always)]
	fn try_from(value: OsString) -> Result<Self, Self::Error>
	{
		if unlikely!(value.is_empty())
		{
			return Err("Can not be empty")
		}
		
		let bytes = value.as_bytes();
		match memchr2(b'/', b'.', bytes)
		{
			None => Ok(Self(value)),
			
			Some(index) => match bytes.get_unchecked_value_safe(index)
			{
				b'/' => Err("Can not contain the directory separator '/'"),
				
				b'.' => if Controller::is_controller(&bytes[.. index])
				{
					Err("Can not use a prefix reserved for a controller (this isn't a perfect check)")
				}
				else
				{
					Ok(Self(value))
				}
				
				_ => unreachable_code(format_args!("")),
			}
		}
	}
}

impl AsRef<Path> for CgroupName
{
	#[inline(always)]
	fn as_ref(&self) -> &Path
	{
		self.0.as_ref()
	}
}