1 //! io-lifetimes provides safe, convenient, and portable ways to temporarily
2 //! view an I/O resource as a `File`, `Socket`, or other types.
3
4 use io_lifetimes::AsFilelike;
5 use std::fs::File;
6 use std::io::{self, stdout};
7
mainnull8 fn main() -> io::Result<()> {
9 let stdout = stdout();
10
11 // With `AsFilelike`, any type implementing `AsFd`/`AsHandle` can be viewed
12 // as any type supporting `FromFilelike`, so you can call `File` methods on
13 // `Stdout` or other things.
14 //
15 // Whether or not you can actually do this is up to the OS, of course. In
16 // this case, Unix can do this, but it appears Windows can't.
17 let metadata = stdout.as_filelike_view::<File>().metadata()?;
18
19 if metadata.is_file() {
20 println!("stdout is a file!");
21 } else {
22 println!("stdout is not a file!");
23 }
24
25 Ok(())
26 }
27