57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// +build linux
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package utils
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/*
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* Copyright 2016 SUSE LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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#include <errno.h>
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#include <stdlib.h>
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#include "cmsg.h"
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*/
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import "C"
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import (
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"os"
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"unsafe"
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)
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// RecvFd waits for a file descriptor to be sent over the given AF_UNIX
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// socket. The file name of the remote file descriptor will be recreated
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// locally (it is sent as non-auxiliary data in the same payload).
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func RecvFd(socket *os.File) (*os.File, error) {
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file, err := C.recvfd(C.int(socket.Fd()))
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if err != nil {
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return nil, err
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}
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defer C.free(unsafe.Pointer(file.name))
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return os.NewFile(uintptr(file.fd), C.GoString(file.name)), nil
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}
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// SendFd sends a file descriptor over the given AF_UNIX socket. In
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// addition, the file.Name() of the given file will also be sent as
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// non-auxiliary data in the same payload (allowing to send contextual
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// information for a file descriptor).
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func SendFd(socket, file *os.File) error {
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var cfile C.struct_file_t
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cfile.fd = C.int(file.Fd())
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cfile.name = C.CString(file.Name())
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defer C.free(unsafe.Pointer(cfile.name))
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_, err := C.sendfd(C.int(socket.Fd()), cfile)
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return err
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}
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