github.com/dolthub/go-mysql-server@v0.18.0/internal/sockstate/netstat_unix.go (about)

     1  // Copyright 2020-2021 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build linux || darwin || freebsd
    16  // +build linux darwin freebsd
    17  
    18  package sockstate
    19  
    20  import (
    21  	"net"
    22  	"syscall"
    23  )
    24  
    25  func getConnFd(c *net.TCPConn) (fd uintptr, err error) {
    26  	f, err := c.File()
    27  	if err != nil {
    28  		return 0, err
    29  	}
    30  
    31  	fd = f.Fd()
    32  
    33  	// We have to set this file back to non-blocking or we get things like
    34  	// blocking Close() in some cases.
    35  	syscall.SetNonblock(int(fd), true)
    36  
    37  	f.Close()
    38  
    39  	return fd, nil
    40  }