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 file-descriptors. 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/file-descriptors/master/COPYRIGHT. No part of file-descriptors, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2018-2019 The developers of file-descriptors. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/file-descriptors/master/COPYRIGHT.


#[link(name = "c")]
extern "C"
{
	/// `flags` is either zero or a bitwise or of `EFD_CLOEXEC`, `EFD_NONBLOCK` or `EFD_SEMAPHORE`.
	///
	/// As its return value, `eventfd()` returns a new file descriptor that can be used to refer to the eventfd object.
	/// On error, -1 is returned and errno is set to indicate the error.
	///
	/// Documented errors are:-
	///
	/// * `EINVAL`: An unsupported value was specified in `flags`.
	/// * `EMFILE`: The per-process limit on the number of open file descriptors has been reached.
	/// * `ENFILE`: The system-wide limit on the total number of open files has been reached.
	/// * `ENODEV`: Could not mount (internal) anonymous inode device.
	/// * `ENOMEM`: There was insufficient kernel memory to create the event data structures.
	pub(crate) fn eventfd(initval: eventfd_t, flags: c_int) -> c_int;
}

/// Provide semaphore-like semantics for reads from the new file descriptor.
///
/// Since Linux 2.6.30.
pub(crate) const EFD_SEMAPHORE: c_int = 1;

/// Set the close-on-exec (`FD_CLOEXEC`) flag on the new file descriptor.
///
/// Since Linux 2.6.27.
pub(crate) const EFD_CLOEXEC: c_int = O_CLOEXEC;

/// Set the `O_NONBLOCK` file status flag on the new file descriptor.
///
/// Since Linux 2.6.27.
pub(crate) const EFD_NONBLOCK: c_int = O_NONBLOCK;