Fix test compilation on Redox. (#1130)

Author: sunfishcode

tests/fs/seek.rs

@@ -61,9 +61,9 @@ fn test_seek_holes() {
 
 #[test]
 fn test_seek_offsets() {
-    use rustix::fs::{openat, seek, Mode, OFlags, SeekFrom, CWD};
+    use rustix::fs::{open, seek, Mode, OFlags, SeekFrom};
 
-    let f = openat(CWD, "Cargo.toml", OFlags::RDONLY, Mode::empty()).unwrap();
+    let f = open("Cargo.toml", OFlags::RDONLY, Mode::empty()).unwrap();
 
     match seek(&f, SeekFrom::Start(0)) {
         Ok(_) => {}

tests/termios/pgrp.rs

@@ -19,8 +19,8 @@ fn pgrp_notty() {
 }
 
 // Disable on illumos where `tcgetattr` doesn't appear to support
-// pseudoterminals.
-#[cfg(not(target_os = "illumos"))]
+// pseudoterminals. And on Redox which lacks `NOCTTY`.
+#[cfg(not(any(target_os = "illumos", target_os = "redox")))]
 #[cfg(feature = "pty")]
 #[test]
 fn pgrp_pseudoterminal() {

tests/termios/sid.rs

@@ -17,6 +17,8 @@ fn sid_notty() {
     assert_eq!(tcgetsid(&fd), Err(Errno::NOTTY));
 }
 
+// Disable on Redox which lacks `getsid`.
+#[cfg(not(target_os = "redox"))]
 #[cfg(all(feature = "stdio", feature = "process"))]
 #[test]
 fn sid_match() {