fileStatWasi

fn fileStatWasi(userdata: ?*anyopaque, file: File) File.StatError!File.Stat {
    if (builtin.link_libc) return fileStatPosix(userdata, file);

    const t: *Threaded = @ptrCast(@alignCast(userdata));
    _ = t;

    const syscall: Syscall = try .start();
    while (true) {
        var stat: std.os.wasi.filestat_t = undefined;
        switch (std.os.wasi.fd_filestat_get(file.handle, &stat)) {
            .SUCCESS => {
                syscall.finish();
                return statFromWasi(&stat);
            },
            .INTR => {
                try syscall.checkCancel();
                continue;
            },
            else => |e| {
                syscall.finish();
                switch (e) {
                    .INVAL => |err| return errnoBug(err),
                    .BADF => |err| return errnoBug(err), // File descriptor used after closed.
                    .NOMEM => return error.SystemResources,
                    .ACCES => return error.AccessDenied,
                    .NOTCAPABLE => return error.AccessDenied,
                    else => |err| return posix.unexpectedErrno(err),
                }
            },
        }
    }
}