Fix tests on illumos. (#1238)

Fix the layout of `epoll::Event` on x86 and x86_64 on illumos to match
libc's layout.

Adjust tests in tests/net/sockopt.rs to avoid using a buffer larger than
supported on illumos.

And change tests/pty/openpty.rs to avoid expecting we can write an EOF
to a pty on illumos, as that doesn't appear to work.

src/event/epoll.rs

@@ -259,6 +259,10 @@ impl<'a> Iterator for Iter<'a> {
     repr(packed)
 )]
 #[derive(Copy, Clone, Eq, PartialEq, Hash)]
+#[cfg_attr(
+    all(solarish, any(target_arch = "x86", target_arch = "x86_64")),
+    repr(packed(4))
+)]
 pub struct Event {
     /// Which specific event(s) occurred.
     pub flags: EventFlags,
@@ -451,7 +455,6 @@ mod tests {
 
     #[test]
     fn test_epoll_layouts() {
-        check_renamed_type!(Event, epoll_event);
         check_renamed_type!(Event, epoll_event);
         check_renamed_struct_renamed_field!(Event, epoll_event, flags, events);
         #[cfg(libc)]

tests/net/sockopt.rs

@@ -128,10 +128,10 @@ fn test_sockopts_socket(s: &OwnedFd) {
 
     // Set the send buffer size.
     let size = sockopt::get_socket_send_buffer_size(s).unwrap();
-    sockopt::set_socket_send_buffer_size(s, size * 4).unwrap();
+    sockopt::set_socket_send_buffer_size(s, size * 2).unwrap();
 
     // Check that the send buffer size is set.
-    assert!(sockopt::get_socket_send_buffer_size(s).unwrap() >= size * 4);
+    assert!(sockopt::get_socket_send_buffer_size(s).unwrap() >= size * 2);
 
     // Check that the oobinline flag is not initially set.
     assert!(!sockopt::get_socket_oobinline(s).unwrap());

tests/pty/openpty.rs

@@ -1,3 +1,5 @@
+#![allow(unused_mut, unused_imports)]
+
 use rustix::fs::{openat, Mode, OFlags, CWD};
 use rustix::pty::*;
 use std::fs::File;
@@ -37,7 +39,24 @@ fn openpty_basic() {
     controller.write_all(b"Hello, world!\n\x04").unwrap();
 
     let mut s = String::new();
-    user.read_to_string(&mut s).unwrap();
+
+    // Read the string back. Our `\x04` above ended the stream, so we can
+    // read to the end of the stream.
+    #[cfg(not(target_os = "illumos"))]
+    {
+        user.read_to_string(&mut s).unwrap();
+    }
+
+    // Except on illumos, where the `\0x04` doesn't seem to translate into an
+    // EOF, so we didn't end the stream, so just the line.
+    #[cfg(target_os = "illumos")]
+    use std::io::{BufRead, BufReader};
+    #[cfg(target_os = "illumos")]
+    let mut user = BufReader::new(user);
+    #[cfg(target_os = "illumos")]
+    {
+        user.read_line(&mut s).unwrap();
+    }
 
     assert_eq!(s, "Hello, world!\n");
 }
@@ -70,6 +89,9 @@ fn openpty_get_peer() {
     controller.write_all(b"Hello, world!\n\x04").unwrap();
 
     let mut s = String::new();
+
+    // Read the string back. Our `\x04` above ended the stream, so we can
+    // read to the end of the stream.
     user.read_to_string(&mut s).unwrap();
 
     assert_eq!(s, "Hello, world!\n");