Document aliases for functions like getuid()

Add the autocfg crate as a build dependency, and introduce
has_doc_alias as a conditional compilation symbol.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/dir.rs b/src/dir.rs
index c9b5af8f..8f9a2d6f 100644
--- a/src/dir.rs
+++ b/src/dir.rs
@@ -53,6 +53,7 @@ impl Dir {
     }
 
     /// Converts from a file descriptor, closing it on success or failure.
+    #[cfg_attr(has_doc_alias, doc(alias("fdopendir")))]
     pub fn from_fd(fd: RawFd) -> Result<Self> {
         let d = ptr::NonNull::new(unsafe { libc::fdopendir(fd) }).ok_or_else(|| {
             let e = Error::last();