libstd: rustdoc: correct note on fds 0/1/2 pre-main

Closes: #137490
2025-02-23 18:57:10 +01:00
parent b522e7c5ea
commit 74ec86248a
1 changed files with 3 additions and 1 deletions
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -174,7 +174,9 @@
 //!
 //! - after-main use of thread-locals, which also affects additional features:
 //!   - [`thread::current()`]
-//! - before-main stdio file descriptors are not guaranteed to be open on unix platforms
+//! - under UNIX, before main, file descriptors 0, 1, and 2 may be unchanged
+//!   (they are guaranteed to be open during main,
+//!    and are opened to /dev/null O_RDWR if they weren't open on program start)
 //!
 //!
 //! [I/O]: io