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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !illumos
package net
import (
"internal/syscall/unix"
"runtime"
"syscall"
"time"
)
// Some macros of TCP Keep-Alive options on Solaris 11.4 may
// differ from those on OpenSolaris-based derivatives.
const (
sysTCP_KEEPIDLE = 0x1D
sysTCP_KEEPINTVL = 0x1E
sysTCP_KEEPCNT = 0x1F
)
func setKeepAliveIdle(fd *netFD, d time.Duration) error {
if !unix.SupportTCPKeepAliveIdleIntvlCNT() {
return setKeepAliveIdleAndIntervalAndCount(fd, d, -1, -1)
}
if d == 0 {
d = defaultTCPKeepAliveIdle
} else if d < 0 {
return nil
}
// The kernel expects seconds so round to next highest second.
secs := int(roundDurationUp(d, time.Second))
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPIDLE, secs)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setKeepAliveInterval(fd *netFD, d time.Duration) error {
if !unix.SupportTCPKeepAliveIdleIntvlCNT() {
return syscall.EPROTOTYPE
}
if d == 0 {
d = defaultTCPKeepAliveInterval
} else if d < 0 {
return nil
}
// The kernel expects seconds so round to next highest second.
secs := int(roundDurationUp(d, time.Second))
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setKeepAliveCount(fd *netFD, n int) error {
if !unix.SupportTCPKeepAliveIdleIntvlCNT() {
return syscall.EPROTOTYPE
}
if n == 0 {
n = defaultTCPKeepAliveCount
} else if n < 0 {
return nil
}
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPCNT, n)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
// setKeepAliveIdleAndIntervalAndCount serves for Solaris prior to 11.4 by simulating
// the TCP_KEEPIDLE, TCP_KEEPINTVL, and TCP_KEEPCNT with `TCP_KEEPALIVE_THRESHOLD` + `TCP_KEEPALIVE_ABORT_THRESHOLD`.
func setKeepAliveIdleAndIntervalAndCount(fd *netFD, idle, interval time.Duration, count int) error {
if idle == 0 {
idle = defaultTCPKeepAliveIdle
}
// The kernel expects milliseconds so round to next highest
// millisecond.
if idle > 0 {
msecs := int(roundDurationUp(idle, time.Millisecond))
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE_THRESHOLD, msecs)
runtime.KeepAlive(fd)
if err != nil {
return wrapSyscallError("setsockopt", err)
}
}
if interval == 0 {
interval = defaultTCPKeepAliveInterval
}
if count == 0 {
count = defaultTCPKeepAliveCount
}
// TCP_KEEPINTVL and TCP_KEEPCNT are not available on Solaris
// prior to 11.4, so it's pointless to "leave it unchanged"
// with negative value for only one of them. On the other hand,
// setting both to negative values should pragmatically leave the
// TCP_KEEPALIVE_ABORT_THRESHOLD unchanged.
abortIdle := int(roundDurationUp(interval, time.Millisecond)) * count
if abortIdle < 0 {
return syscall.ENOPROTOOPT
}
if interval < 0 && count < 0 {
abortIdle = -1
}
if abortIdle > 0 {
// Note that the consequent probes will not be sent at equal intervals on Solaris,
// but will be sent using the exponential backoff algorithm.
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE_ABORT_THRESHOLD, abortIdle)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
return nil
}
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