checks termios size in the baud test

usamoi · tgross35 · commit 52fcf32016d6 · 2026-02-09T12:53:53.000Z
(backport <#4938>) (cherry picked from commit 44b709c)
diff --git a/libc-test/tests/linux_gnu_baud.rs b/libc-test/tests/linux_gnu_baud.rs
@@ -13,21 +13,24 @@ fn baud() {
     assert!(ret >= 0);
     let terminal_fd = unsafe { open(buffer.as_ptr(), O_RDWR | O_NOCTTY) };
     assert!(terminal_fd >= 0);
-    let mut tio: termios = unsafe { std::mem::zeroed() };
-    let ret = unsafe { tcgetattr(terminal_fd, &mut tio) };
+    #[repr(C)]
+    struct Protector(termios, [u8; 512]);
+    let mut tio: Protector = unsafe { Protector(std::mem::zeroed(), [0xcc; _]) };
+    let ret = unsafe { tcgetattr(terminal_fd, &raw mut tio.0) };
     assert!(ret >= 0);
-    assert_eq!(unsafe { cfgetispeed(&tio) }, B38400);
-    assert_eq!(unsafe { cfgetospeed(&tio) }, B38400);
-    let ret = unsafe { cfsetspeed(&mut tio, B1000000) };
+    assert_eq!(tio.1, [0xcc; _]);
+    assert_eq!(unsafe { cfgetispeed(&tio.0) }, B38400);
+    assert_eq!(unsafe { cfgetospeed(&tio.0) }, B38400);
+    let ret = unsafe { cfsetspeed(&mut tio.0, B1000000) };
     assert!(ret >= 0);
-    assert_eq!(unsafe { cfgetispeed(&tio) }, B1000000);
-    assert_eq!(unsafe { cfgetospeed(&tio) }, B1000000);
-    let ret = unsafe { cfsetispeed(&mut tio, B9600) };
+    assert_eq!(unsafe { cfgetispeed(&tio.0) }, B1000000);
+    assert_eq!(unsafe { cfgetospeed(&tio.0) }, B1000000);
+    let ret = unsafe { cfsetispeed(&mut tio.0, B9600) };
     assert!(ret >= 0);
-    assert_eq!(unsafe { cfgetispeed(&tio) }, B9600);
-    assert!(matches!(unsafe { cfgetospeed(&tio) }, B9600 | B1000000));
-    let ret = unsafe { cfsetospeed(&mut tio, B19200) };
+    assert_eq!(unsafe { cfgetispeed(&tio.0) }, B9600);
+    assert!(matches!(unsafe { cfgetospeed(&tio.0) }, B9600 | B1000000));
+    let ret = unsafe { cfsetospeed(&mut tio.0, B19200) };
     assert!(ret >= 0);
-    assert!(matches!(unsafe { cfgetispeed(&tio) }, B9600 | B19200));
-    assert_eq!(unsafe { cfgetospeed(&tio) }, B19200);
+    assert!(matches!(unsafe { cfgetispeed(&tio.0) }, B9600 | B19200));
+    assert_eq!(unsafe { cfgetospeed(&tio.0) }, B19200);
 }
