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29 lines
821 B
Go
29 lines
821 B
Go
//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd
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package machine
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import (
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"net"
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"syscall"
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)
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func getPortCheckListenConfig() *net.ListenConfig {
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return &net.ListenConfig{
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Control: func(network, address string, c syscall.RawConn) (cerr error) {
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if err := c.Control(func(fd uintptr) {
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// Prevent listening socket from holding over in TIME_WAIT in the rare case a connection
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// attempt occurs in the short window the socket is listening. This ensures the registration
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// will be gone when close() completes, freeing it up for the real subsequent listen by another
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// process
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cerr = syscall.SetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER, &syscall.Linger{
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Onoff: 1,
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Linger: 0,
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})
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}); err != nil {
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cerr = err
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}
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return
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},
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}
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}
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