github.com/qichengzx/mattermost-server@v4.5.1-0.20180604164826-2c75247c97d0+incompatible/plugin/rpcplugin/ipc.go (about)

     1  // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
     2  // See License.txt for license information.
     3  
     4  package rpcplugin
     5  
     6  import (
     7  	"io"
     8  	"os"
     9  )
    10  
    11  // Returns a new IPC for the parent process and a set of files to pass on to the child.
    12  //
    13  // The returned files must be closed after the child process is started.
    14  func NewIPC() (io.ReadWriteCloser, []*os.File, error) {
    15  	parentReader, childWriter, err := os.Pipe()
    16  	if err != nil {
    17  		return nil, nil, err
    18  	}
    19  	childReader, parentWriter, err := os.Pipe()
    20  	if err != nil {
    21  		parentReader.Close()
    22  		childWriter.Close()
    23  		return nil, nil, err
    24  	}
    25  	return NewReadWriteCloser(parentReader, parentWriter), []*os.File{childReader, childWriter}, nil
    26  }
    27  
    28  // Returns the IPC instance inherited by the process from its parent.
    29  func InheritedIPC(fd0, fd1 uintptr) (io.ReadWriteCloser, error) {
    30  	return NewReadWriteCloser(os.NewFile(fd0, ""), os.NewFile(fd1, "")), nil
    31  }