Used pthread name functions returning result for FreeBSD and DragonFly

Author: YohDeadfall

library/std/src/sys/pal/unix/thread.rs

@@ -129,25 +129,27 @@ impl Thread {
 }
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly"))]
 pubfnset_name(name:&CStr){
-constTASK_COMM_LEN:usize = 16;
-
 unsafe{
-// Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20.
-let name = truncate_cstr::<{TASK_COMM_LEN}>(name);
+ cfg_if::cfg_if! {
+if #[cfg(target_os = "linux")]{
+// Linux limits the allowed length of the name.
+constTASK_COMM_LEN:usize = 16;
+let name = truncate_cstr::<{TASK_COMM_LEN}>(name);
+} else {
+// FreeBSD and DragonFly BSD do not enforce length limits.
+}
+};
+// Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20 for Linux,
+// FreeBSD 12.2 and 13.0, and DragonFly BSD 6.0.
 let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr());
 // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked.
 debug_assert_eq!(res,0);
 }
 }
 
-#[cfg(any(
- target_os = "freebsd",
- target_os = "dragonfly",
- target_os = "openbsd",
- target_os = "nuttx"
-))]
+#[cfg(any(target_os = "openbsd", target_os = "nuttx"))]
 pubfnset_name(name:&CStr){
 unsafe{
  libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr());