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// Code generated by go generate. DO NOT EDIT.
// Source: sys_conn_buffers.go
package quic
import (
"errors"
"fmt"
"net"
"syscall"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/utils"
)
func setSendBuffer(c net.PacketConn) error {
conn, ok := c.(interface{ SetWriteBuffer(int) error })
if !ok {
return errors.New("connection doesn't allow setting of send buffer size. Not a *net.UDPConn?")
}
var syscallConn syscall.RawConn
if sc, ok := c.(interface {
SyscallConn() (syscall.RawConn, error)
}); ok {
var err error
syscallConn, err = sc.SyscallConn()
if err != nil {
syscallConn = nil
}
}
// The connection has a SetWriteBuffer method, but we couldn't obtain a syscall.RawConn.
// This shouldn't happen for a net.UDPConn, but is possible if the connection just implements the
// net.PacketConn interface and the SetWriteBuffer method.
// We have no way of checking if increasing the buffer size actually worked.
if syscallConn == nil {
return conn.SetWriteBuffer(protocol.DesiredSendBufferSize)
}
size, err := inspectWriteBuffer(syscallConn)
if err != nil {
return fmt.Errorf("failed to determine send buffer size: %w", err)
}
if size >= protocol.DesiredSendBufferSize {
utils.DefaultLogger.Debugf("Conn has send buffer of %d kiB (wanted: at least %d kiB)", size/1024, protocol.DesiredSendBufferSize/1024)
return nil
}
// Ignore the error. We check if we succeeded by querying the buffer size afterward.
_ = conn.SetWriteBuffer(protocol.DesiredSendBufferSize)
newSize, err := inspectWriteBuffer(syscallConn)
if newSize < protocol.DesiredSendBufferSize {
// Try again with RCVBUFFORCE on Linux
_ = forceSetSendBuffer(syscallConn, protocol.DesiredSendBufferSize)
newSize, err = inspectWriteBuffer(syscallConn)
if err != nil {
return fmt.Errorf("failed to determine send buffer size: %w", err)
}
}
if err != nil {
return fmt.Errorf("failed to determine send buffer size: %w", err)
}
if newSize == size {
return fmt.Errorf("failed to increase send buffer size (wanted: %d kiB, got %d kiB)", protocol.DesiredSendBufferSize/1024, newSize/1024)
}
if newSize < protocol.DesiredSendBufferSize {
return fmt.Errorf("failed to sufficiently increase send buffer size (was: %d kiB, wanted: %d kiB, got: %d kiB)", size/1024, protocol.DesiredSendBufferSize/1024, newSize/1024)
}
utils.DefaultLogger.Debugf("Increased send buffer size to %d kiB", newSize/1024)
return nil
}
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