Handle file descriptors as usize #3
Description
File descriptors are handled as i32 in WASI functions arguments, like this.
pub export fn fd_close(fd: i32) callconv(.C) WasiErrorWe pass them around as i32. But indices must be usize in Zig, so we must cast them every time we index the file descriptor table.
pub fn get(self: *Self, fd: i32) ?*Stream {
const streams = self.streams.acquire();
defer self.streams.release();
const s = &streams.*[@as(usize, @intCast(fd))];
if (s.* == null) {
return null;
}
return @as(*Stream, @ptrCast(s));
}To avoid it, we want to cast fd to usize in WASI functions, and handle it as usize in stream module.