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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
// This is a companion to System.swift that provides only Linux specials: either things that exist
// only on Linux, or things that have Linux-specific extensions.
#if os(Linux) || os(Android)
import CNIOLinux
internal enum TimerFd {
internal static let TFD_CLOEXEC = CNIOLinux.TFD_CLOEXEC
internal static let TFD_NONBLOCK = CNIOLinux.TFD_NONBLOCK
@inline(never)
internal static func timerfd_settime(fd: CInt, flags: CInt, newValue: UnsafePointer<itimerspec>, oldValue: UnsafeMutablePointer<itimerspec>?) throws {
_ = try syscall(blocking: false) {
CNIOLinux.timerfd_settime(fd, flags, newValue, oldValue)
}
}
@inline(never)
internal static func timerfd_create(clockId: CInt, flags: CInt) throws -> CInt {
return try syscall(blocking: false) {
CNIOLinux.timerfd_create(clockId, flags)
}.result
}
}
internal enum EventFd {
internal static let EFD_CLOEXEC = CNIOLinux.EFD_CLOEXEC
internal static let EFD_NONBLOCK = CNIOLinux.EFD_NONBLOCK
internal typealias eventfd_t = CNIOLinux.eventfd_t
@inline(never)
internal static func eventfd_write(fd: CInt, value: UInt64) throws -> CInt {
return try syscall(blocking: false) {
CNIOLinux.eventfd_write(fd, value)
}.result
}
@inline(never)
internal static func eventfd_read(fd: CInt, value: UnsafeMutablePointer<UInt64>) throws -> CInt {
return try syscall(blocking: false) {
CNIOLinux.eventfd_read(fd, value)
}.result
}
@inline(never)
internal static func eventfd(initval: CUnsignedInt, flags: CInt) throws -> CInt {
return try syscall(blocking: false) {
// Note: Please do _not_ remove the `numericCast`, this is to allow compilation in Ubuntu 14.04 and
// other Linux distros which ship a glibc from before this commit:
// https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=69eb9a183c19e8739065e430758e4d3a2c5e4f1a
// which changes the first argument from `CInt` to `CUnsignedInt` (from Sat, 20 Sep 2014).
CNIOLinux.eventfd(numericCast(initval), flags)
}.result
}
}
internal enum Epoll {
internal typealias epoll_event = CNIOLinux.epoll_event
internal static let EPOLL_CTL_ADD: CInt = numericCast(CNIOLinux.EPOLL_CTL_ADD)
internal static let EPOLL_CTL_MOD: CInt = numericCast(CNIOLinux.EPOLL_CTL_MOD)
internal static let EPOLL_CTL_DEL: CInt = numericCast(CNIOLinux.EPOLL_CTL_DEL)
#if os(Android)
internal static let EPOLLIN: CUnsignedInt = 1 //numericCast(CNIOLinux.EPOLLIN)
internal static let EPOLLOUT: CUnsignedInt = 4 //numericCast(CNIOLinux.EPOLLOUT)
internal static let EPOLLERR: CUnsignedInt = 8 // numericCast(CNIOLinux.EPOLLERR)
internal static let EPOLLRDHUP: CUnsignedInt = 8192 //numericCast(CNIOLinux.EPOLLRDHUP)
internal static let EPOLLHUP: CUnsignedInt = 16 //numericCast(CNIOLinux.EPOLLHUP)
internal static let EPOLLET: CUnsignedInt = 2147483648 //numericCast(CNIOLinux.EPOLLET)
#else
internal static let EPOLLIN: CUnsignedInt = numericCast(CNIOLinux.EPOLLIN.rawValue)
internal static let EPOLLOUT: CUnsignedInt = numericCast(CNIOLinux.EPOLLOUT.rawValue)
internal static let EPOLLERR: CUnsignedInt = numericCast(CNIOLinux.EPOLLERR.rawValue)
internal static let EPOLLRDHUP: CUnsignedInt = numericCast(CNIOLinux.EPOLLRDHUP.rawValue)
internal static let EPOLLHUP: CUnsignedInt = numericCast(CNIOLinux.EPOLLHUP.rawValue)
internal static let EPOLLET: CUnsignedInt = numericCast(CNIOLinux.EPOLLET.rawValue)
#endif
internal static let ENOENT: CUnsignedInt = numericCast(CNIOLinux.ENOENT)
@inline(never)
internal static func epoll_create(size: CInt) throws -> CInt {
return try syscall(blocking: false) {
CNIOLinux.epoll_create(size)
}.result
}
@inline(never)
@discardableResult
internal static func epoll_ctl(epfd: CInt, op: CInt, fd: CInt, event: UnsafeMutablePointer<epoll_event>) throws -> CInt {
return try syscall(blocking: false) {
CNIOLinux.epoll_ctl(epfd, op, fd, event)
}.result
}
@inline(never)
internal static func epoll_wait(epfd: CInt, events: UnsafeMutablePointer<epoll_event>, maxevents: CInt, timeout: CInt) throws -> CInt {
return try syscall(blocking: false) {
CNIOLinux.epoll_wait(epfd, events, maxevents, timeout)
}.result
}
}
internal enum Linux {
static let cfsQuotaPath = "/sys/fs/cgroup/cpu/cpu.cfs_quota_us"
static let cfsPeriodPath = "/sys/fs/cgroup/cpu/cpu.cfs_period_us"
static let cpuSetPath = "/sys/fs/cgroup/cpuset/cpuset.cpus"
#if os(Android)
static let SOCK_CLOEXEC = Glibc.SOCK_CLOEXEC
static let SOCK_NONBLOCK = Glibc.SOCK_NONBLOCK
#else
static let SOCK_CLOEXEC = CInt(bitPattern: Glibc.SOCK_CLOEXEC.rawValue)
static let SOCK_NONBLOCK = CInt(bitPattern: Glibc.SOCK_NONBLOCK.rawValue)
#endif
@inline(never)
internal static func accept4(descriptor: CInt,
addr: UnsafeMutablePointer<sockaddr>?,
len: UnsafeMutablePointer<socklen_t>?,
flags: CInt) throws -> CInt? {
guard case let .processed(fd) = try syscall(blocking: true, {
CNIOLinux.CNIOLinux_accept4(descriptor, addr, len, flags)
}) else {
return nil
}
return fd
}
private static func firstLineOfFile(path: String) throws -> Substring {
let fh = try NIOFileHandle(path: path)
defer { try! fh.close() }
// linux doesn't properly report /sys/fs/cgroup/* files lengths so we use a reasonable limit
var buf = ByteBufferAllocator().buffer(capacity: 1024)
try buf.writeWithUnsafeMutableBytes(minimumWritableBytes: buf.capacity) { ptr in
let res = try fh.withUnsafeFileDescriptor { fd -> IOResult<ssize_t> in
return try Posix.read(descriptor: fd, pointer: ptr.baseAddress!, size: ptr.count)
}
switch res {
case .processed(let n):
return n
case .wouldBlock:
preconditionFailure("read returned EWOULDBLOCK despite a blocking fd")
}
}
return String(buffer: buf).prefix(while: { $0 != "\n" })
}
private static func countCoreIds(cores: Substring) -> Int {
let ids = cores.split(separator: "-", maxSplits: 1)
guard
let first = ids.first.flatMap({ Int($0, radix: 10) }),
let last = ids.last.flatMap({ Int($0, radix: 10) }),
last >= first
else { preconditionFailure("cpuset format is incorrect") }
return 1 + last - first
}
static func coreCount(cpuset cpusetPath: String) -> Int? {
guard
let cpuset = try? firstLineOfFile(path: cpusetPath).split(separator: ","),
!cpuset.isEmpty
else { return nil }
return cpuset.map(countCoreIds).reduce(0, +)
}
static func coreCount(quota quotaPath: String, period periodPath: String) -> Int? {
guard
let quota = try? Int(firstLineOfFile(path: quotaPath)),
quota > 0
else { return nil }
guard
let period = try? Int(firstLineOfFile(path: periodPath)),
period > 0
else { return nil }
return (quota - 1 + period) / period // always round up if fractional CPU quota requested
}
}
#endif
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