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.


/// Process state.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[derive(Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
pub enum ProcessState
{
	/// Running.
	Running,

	/// Sleeping in an interruptible wait.
	Sleeping,

	/// Waiting in uninterruptible disk sleep.
	SleepingInAnUninterruptibleWait,

	/// Stopped.
	///
	/// Before Linux 2.6.33, this also covered `TracingStop` below.
	Stopped,

	/// Stopped while Traching.
	///
	/// Linux 2.6.33 onward.
	TracingStop,

	/// Dead.
	Dead,

	/// Zombie.
	Zombie,

	/// Idle.
	///
	/// Not documented in manpage for `/proc/<N>/stat`.
	Idle,

	/// WakeKill.
	///
	/// Linux 3.9 to 3.13 only.
	///
	/// deprecated but not marked with `#[deprecated]` as interferes with automatic impls generated by `#[derive]`.
	WakeKill,

	/// Parked.
	///
	/// Linux 3.9 to 3.13 only.
	///
	/// deprecated but not marked with `#[deprecated]` as interferes with automatic impls generated by `#[derive]`.
	Parked,

	/// Paging before Linux 2.6.0.
	///
	/// Waking for Linux 2.6.33 to 3.13 only.
	///
	/// deprecated but not marked with `#[deprecated]` as interferes with automatic impls generated by `#[derive]`.
	PagingOrWaking,
}

impl FromBytes for ProcessState
{
	type Error = ParseNumberError;

	#[inline(always)]
	fn from_bytes(value: &[u8]) -> Result<Self, Self::Error>
	{
		use self::ParseNumberError::*;

		// Values are like `R (running)`.
		if unlikely!(value.len() < 1)
		{
			return Err(TooShort)
		}

		use self::ProcessState::*;

		let value = match value[0]
		{
			b'R' => Running,
			b'S' => Sleeping,
			b'D' => SleepingInAnUninterruptibleWait,
			b'Z' => Zombie,
			b'T' => Stopped,
			b'X' => Dead,
			b'I' => Idle,

			// Linux 2.6.33 onward.
			b't' => TracingStop,

			// Linux 2.6.33 to 3.13 only.
			b'x' => Dead,

			// Only before Linux 2.6.0, when it was used for Paging, and Linux Linux 2.6.33 to 3.13 only.
			#[allow(deprecated)] b'W' => PagingOrWaking,

			// Linux 3.9 to 3.13 only.
			#[allow(deprecated)] b'K' => WakeKill,

			// Linux 3.9 to 3.13 only.
			#[allow(deprecated)] b'P' => Parked,

			_ => return Err(OutOfRange)
		};

		Ok(value)
	}
}

impl TryFrom<i8> for ProcessState
{
	type Error = ParseNumberError;
	
	#[inline(always)]
	fn try_from(value: i8) -> Result<Self, Self::Error>
	{
		Self::try_from(value as u8)
	}
}

impl TryFrom<u8> for ProcessState
{
	type Error = ParseNumberError;
	
	#[inline(always)]
	fn try_from(value: u8) -> Result<Self, Self::Error>
	{
		use self::ParseNumberError::*;
		use self::ProcessState::*;

		let value = match value
		{
			b'R' => Running,
			b'S' => Sleeping,
			b'D' => SleepingInAnUninterruptibleWait,
			b'Z' => Zombie,
			b'T' => Stopped,
			b'X' => Dead,
			b'I' => Idle,

			// Linux 2.6.33 onward.
			b't' => TracingStop,

			// Linux 2.6.33 to 3.13 only.
			b'x' => Dead,

			// Only before Linux 2.6.0, when it was used for Paging, and Linux Linux 2.6.33 to 3.13 only.
			#[allow(deprecated)] b'W' => PagingOrWaking,

			// Linux 3.9 to 3.13 only.
			#[allow(deprecated)] b'K' => WakeKill,

			// Linux 3.9 to 3.13 only.
			#[allow(deprecated)] b'P' => Parked,

			_ => return Err(OutOfRange)
		};

		Ok(value)
	}
}