You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gproc_comm_send.go
    path of file: ./repos/gf/os/gproc
    
    the code of the file until where you have to start completion: // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

package gproc

import (
	"io"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/internal/json"
	"github.com/gogf/gf/v2/net/gtcp"
)

// Send sends data to specified process of given pid.
func Send(pid int, data []byte, group ...string) error {
	msg := MsgRequest{
		SenderPid:   Pid
    
func Send(pid int, data []byte, group ...string) error {
	msg := MsgRequest{
		SenderPid:   Pid(),
		ReceiverPid: pid,
		Group:       defaultGroupNameForProcComm,
		Data:        data,
	}
	if len(group) > 0 {
		msg.Group = group[0]
	}
	msgBytes, err := json.Marshal(msg)
	if err != nil {
		return err
	}
	var conn *gtcp.PoolConn
	conn, err = getConnByPid(pid)
	if err != nil {
		return err
	}
	defer conn.Close()
	// Do the sending.
	var result []byte
	result, err = conn.SendRecvPkg(msgBytes, gtcp.PkgOption{
		Retry: gtcp.Retry{
			Count: 3,
		},
	})
	if len(result) > 0 {
		response := new(MsgResponse)
		if err = json.UnmarshalUseNumber(result, response); err == nil {
			if response.Code != 1 {
				err = gerror.New(response.Message)
			}
		}
	}
	// EOF is not really an error.
	if err == io.EOF {
		err = nil
	}
	return err
}