Get position bug fixed (#465)

CHANGELOG.md

@@ -1,3 +1,6 @@
+# Version 0.17.7
+- Fix cursor position retrieval bug linux.
+
 # Version 0.17.6
 - Add functionality to retrieve color based on passed ansi code. 
 - Switch from 'futures' to 'futures-util' crate to reduce dependency count

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "crossterm"
-version = "0.17.6"
+version = "0.17.7"
 authors = ["T. Post"]
 description = "An crossplatform terminal library for manipulating terminals."
 repository = "https://github.com/crossterm-rs/crossterm"

src/event/source/unix.rs

@@ -79,7 +79,16 @@ impl EventSource for UnixInternalEventSource {
         let timeout = PollTimeout::new(timeout);
 
         loop {
-            self.poll.poll(&mut self.events, timeout.leftover())?;
+            if let Err(e) = self.poll.poll(&mut self.events, timeout.leftover()) {
+                // Mio will throw an interrupted error in case of cursor position retrieval. We need to retry until it succeeds.
+                // Previous versions of Mio (< 0.7) would automatically retry the poll call if it was interrupted (if EINTR was returned).
+                // https://docs.rs/mio/0.7.0/mio/struct.Poll.html#notes
+                if e.kind() == io::ErrorKind::Interrupted {
+                    continue;
+                } else {
+                    return Err(ErrorKind::IoError(e));
+                }
+            };
 
             if self.events.is_empty() {
                 // No readiness events = timeout