1 files changed, 87 insertions, 2 deletions
diff --git a/test/sys/test_termios.rs b/test/sys/test_termios.rs
index a41304d7..0a2d1855 100644
--- a/test/sys/test_termios.rs
+++ b/test/sys/test_termios.rs
@@ -1,6 +1,18 @@
+use std::os::unix::prelude::*;
+
+use nix::{Error, fcntl, unistd};
 use nix::errno::Errno;
-use nix::sys::termios;
-use nix::{Error, unistd};
+use nix::pty::openpty;
+use nix::sys::termios::{self, ECHO, OPOST, OCRNL, tcgetattr};
+use nix::unistd::{read, write, close};
+
+/// Helper function analogous to std::io::Write::write_all, but for `RawFd`s
+fn write_all(f: RawFd, buf: &[u8]) {
+    let mut len = 0;
+    while len < buf.len() {
+        len += write(f, &buf[len..]).unwrap();
+    }
+}
 
 #[test]
 fn test_tcgetattr() {
@@ -19,3 +31,76 @@ fn test_tcgetattr() {
         }
     }
 }
+
+// Test modifying output flags
+#[test]
+fn test_output_flags() {
+    // Open one pty to get attributes for the second one
+    let mut termios = {
+        let pty = openpty(None, None).unwrap();
+        assert!(pty.master > 0);
+        assert!(pty.slave > 0);
+        let termios = tcgetattr(pty.master).unwrap();
+        termios
+    };
+
+    // Make sure postprocessing '\r' isn't specified by default or this test is useless.
+    assert!(!termios.output_flags.contains(OPOST | OCRNL));
+
+    // Specify that '\r' characters should be transformed to '\n'
+    // OPOST is specified to enable post-processing
+    termios.output_flags.insert(OPOST | OCRNL);
+
+    // Open a pty
+    let pty = openpty(None, &termios).unwrap();
+    assert!(pty.master > 0);
+    assert!(pty.slave > 0);
+
+    // Write into the master
+    let string = "foofoofoo\r";
+    write_all(pty.master, string.as_bytes());
+
+    // Read from the slave verifying that the output has been properly transformed
+    let mut buf = [0u8; 10];
+    ::read_exact(pty.slave, &mut buf);
+    let transformed_string = "foofoofoo\n";
+    assert_eq!(&buf, transformed_string.as_bytes());
+}
+
+// Test modifying local flags
+#[test]
+fn test_local_flags() {
+    // Open one pty to get attributes for the second one
+    let mut termios = {
+        let pty = openpty(None, None).unwrap();
+        assert!(pty.master > 0);
+        assert!(pty.slave > 0);
+        let termios = tcgetattr(pty.master).unwrap();
+        termios
+    };
+
+    // Make sure echo is specified by default or this test is useless.
+    assert!(termios.local_flags.contains(ECHO));
+
+    // Disable local echo
+    termios.local_flags.remove(ECHO);
+
+    // Open a new pty with our modified termios settings
+    let pty = openpty(None, &termios).unwrap();
+    assert!(pty.master > 0);
+    assert!(pty.slave > 0);
+
+    // Set the master is in nonblocking mode or reading will never return.
+    let flags = fcntl::fcntl(pty.master, fcntl::F_GETFL).unwrap();
+    let new_flags = fcntl::OFlag::from_bits(flags).unwrap() | fcntl::O_NONBLOCK;
+    fcntl::fcntl(pty.master, fcntl::F_SETFL(new_flags)).unwrap();
+
+    // Write into the master
+    let string = "foofoofoo\r";
+    write_all(pty.master, string.as_bytes());
+
+    // Try to read from the master, which should not have anything as echoing was disabled.
+    let mut buf = [0u8; 10];
+    let read = read(pty.master, &mut buf).unwrap_err();
+    assert_eq!(read, Error::Sys(Errno::EAGAIN));
+}