Move prctl test to the same file as other libc tests.

Author: Vytautas Astrauskas

tests/run-pass/concurrency/libc_prctl_thread_name.rs

@@ -141,6 +141,20 @@ fn test_rwlock_libc_static_initializer() {
     }
 }
 
+/// Test whether the `prctl` shim correctly sets the thread name.
+///
+/// Note: `prctl` exists only on Linux.
+fn test_prctl_thread_name() {
+    use std::ffi::CString;
+    unsafe {
+        let thread_name = CString::new("hello").expect("CString::new failed");
+        assert_eq!(libc::prctl(libc::PR_SET_NAME, thread_name.as_ptr() as libc::c_long, 0 as libc::c_long, 0 as libc::c_long, 0 as libc::c_long), 0);
+        let mut buf = [0; 6];
+        assert_eq!(libc::prctl(libc::PR_GET_NAME, buf.as_mut_ptr() as libc::c_long, 0 as libc::c_long, 0 as libc::c_long, 0 as libc::c_long), 0);
+        assert_eq!(thread_name.as_bytes_with_nul(), buf);
+    }
+}
+
 fn main() {
     #[cfg(target_os = "linux")]
     test_posix_fadvise();
@@ -152,4 +166,7 @@ fn main() {
 
     #[cfg(target_os = "linux")]
     test_mutex_libc_static_initializer_recursive();
+
+    #[cfg(target_os = "linux")]
+    test_prctl_thread_name();
 }