Is it possible to write to file descriptor opened in C from a Lua function?

Question

我有一个小的C程序调用Lua函数并向它发送一个文件描述符，是否可以从Lua写入这个文件描述符？

Answer 1

Have a look at the C function fdopen(). It takes a file descriptor and gives you back a stream/FILE*.

If you implement a Lua C extension for fdopen() to give you back a LuaStream then you can use the normal Lua io calls on the resulting Lua Stream.

Better than just implementing a one-off function for what you want to do.

see io_open in liolib.c of the Lua 5.2.1 sources for an example of creating a Lua Stream.

Answer 2

我认为在调用lua函数之前将标准输出重定向到套接字fd可能会起作用，但是返回字符串并将其写入C更容易。