Implement From<RawFd> for Stdio

Author: ariel-miculas

daemonize/src/lib.rs

@@ -65,6 +65,7 @@ use std::fs::File;
 use std::mem::transmute;
 use std::os::unix::ffi::OsStringExt;
 use std::os::unix::io::AsRawFd;
+use std::os::unix::io::RawFd;
 use std::path::{Path, PathBuf};
 use std::process::exit;
 
@@ -146,6 +147,7 @@ impl From<u32> for Mask {
 enum StdioImpl {
     Devnull,
     RedirectToFile(File),
+    RedirectToRawFd(RawFd),
     Keep,
 }
 
@@ -177,6 +179,14 @@ impl From<File> for Stdio {
     }
 }
 
+impl From<RawFd> for Stdio {
+    fn from(fd: RawFd) -> Self {
+        Self {
+            inner: StdioImpl::RedirectToRawFd(fd),
+        }
+    }
+}
+
 /// Parent process execution outcome.
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
 #[non_exhaustive]
@@ -483,6 +493,9 @@ unsafe fn redirect_standard_streams(
                 let raw_fd = file.as_raw_fd();
                 check_err(libc::dup2(raw_fd, fd), ErrorKind::RedirectStreams)?;
             }
+            StdioImpl::RedirectToRawFd(raw_fd) => {
+                check_err(libc::dup2(raw_fd, fd), ErrorKind::RedirectStreams)?;
+            }
             StdioImpl::Keep => (),
         };
         Ok(())