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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.
/// Can not exceed `u8::MAX`.
///
/// Number of times to retransmit `SYN-ACK`.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[derive(Deserialize, Serialize)]
#[repr(transparent)]
pub struct MaximumSynAckRetransmits(NonZeroU8);
impl TryFrom<NonZeroU8> for MaximumSynAckRetransmits
{
type Error = ParseNumberError;
#[inline(always)]
fn try_from(value: NonZeroU8) -> Result<Self, Self::Error>
{
if unlikely!(value > Self::InclusiveMaximum.0)
{
Err(ParseNumberError::TooLarge)
}
else
{
Ok(Self(value))
}
}
}
impl Default for MaximumSynAckRetransmits
{
#[inline(always)]
fn default() -> Self
{
Self::Default
}
}
impl MaximumSynAckRetransmits
{
/// Default is 5.
///
/// From `/proc/sys/net/ipv4/tcp_synack_retries`.
pub const Default: Self = Self(new_non_zero_u8(5));
/// Inclusive minimum.
pub const InclusiveMinimum: Self = Self(new_non_zero_u8(1));
/// Inclusive maximum.
pub const InclusiveMaximum: Self = Self(new_non_zero_u8(i8::MAX as u8));
/// Value of `/proc/sys/net/ipv4/tcp_synack_retries`.
#[inline(always)]
pub fn global_maximum(proc_path: &ProcPath) -> Self
{
Self(Self::sys_net_ipv4_tcp_synack_retries_file_path(proc_path).read_value().unwrap())
}
/// Set value of `/proc/sys/net/ipv4/tcp_synack_retries` if it exists.
#[inline(always)]
pub fn set_global_maximum(self, proc_path: &ProcPath) -> io::Result<()>
{
assert_effective_user_id_is_root("write to `/proc/sys/net/ipv4/tcp_synack_retries`");
let file_path = Self::sys_net_ipv4_tcp_synack_retries_file_path(proc_path);
if file_path.exists()
{
file_path.write_value(UnpaddedDecimalInteger(self.0))
}
else
{
Ok(())
}
}
#[inline(always)]
fn sys_net_ipv4_tcp_synack_retries_file_path(proc_path: &ProcPath) -> PathBuf
{
proc_path.sys_net_ipv4_file_path("tcp_synack_retries")
}
}