Target

to find out something interesting in Go runtime

• insert code into runtime
• add a pipe in runtime

now we change direction to leverage ast package to preprocess the source project, so that we could finish the task

1.insert code into runtime

you can use the file in runtime_change to test after inserting code

2.process_communicate

Add a pipe runtime

/usr/lib/go-1.18/src/runtime/sys_netbsd_386.s:// func pipe2(flags int32) (r, w int32, errno int32)

/usr/lib/go-1.18/src/runtime/syscall_solaris.go

func syscall_write(fd, buf, nbyte uintptr) (n, err uintptr) 

/usr/lib/go-1.18/src/os

func Pipe() (r *File, w *File, err error) {
	var p [2]syscall.Handle
	e := syscall.Pipe(p[:])
	if e != nil {
		return nil, nil, NewSyscallError("pipe", e)
	}
	return newFile(p[0], "|0", "pipe"), newFile(p[1], "|1", "pipe"), nil
}

/usr/lib/go-1.18/src/syscall/syscall_windows.go

func Pipe(p []Handle) (err error) {
	if len(p) != 2 {
		return EINVAL
	}
	var r, w Handle
	e := CreatePipe(&r, &w, makeInheritSa(), 0)
	if e != nil {
		return e
	}
	p[0] = r
	p[1] = w
	return nil
}

3 go hook