Check all last error in test

Author: tiif

tests/pass-dep/libc/libc-eventfd.rs

@@ -41,6 +41,8 @@ fn test_read_write() {
     // value -1.
     let mut buf: [u8; 8] = [0; 8];
     let res = read_bytes(fd, &mut buf);
+    let e = std::io::Error::last_os_error();
+    assert_eq!(e.raw_os_error(), Some(libc::EAGAIN));
     assert_eq!(res, -1);
 
     // Write with supplied buffer bigger than 8 bytes should be allowed.
@@ -58,12 +60,16 @@ fn test_read_write() {
     // value -1.
     let mut buf: [u8; 7] = [1; 7];
     let res = read_bytes(fd, &mut buf);
+    let e = std::io::Error::last_os_error();
+    assert_eq!(e.raw_os_error(), Some(libc::EINVAL));
     assert_eq!(res, -1);
 
     // Write with supplied buffer smaller than 8 bytes should fail with return
     // value -1.
     let size_7_data: [u8; 7] = [1; 7];
     let res = write_bytes(fd, size_7_data);
+    let e = std::io::Error::last_os_error();
+    assert_eq!(e.raw_os_error(), Some(libc::EINVAL));
     assert_eq!(res, -1);
 
     // Read with supplied buffer bigger than 8 bytes should be allowed.
@@ -74,6 +80,8 @@ fn test_read_write() {
     // Write u64::MAX should fail.
     let u64_max_bytes: [u8; 8] = [255; 8];
     let res = write_bytes(fd, u64_max_bytes);
+    let e = std::io::Error::last_os_error();
+    assert_eq!(e.raw_os_error(), Some(libc::EINVAL));
     assert_eq!(res, -1);
 }