8158 Want named threads API
9857 proc manpages should have LIBRARY section

*** 19,29 ****
   * CDDL HEADER END
   */
  
  /*
   * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2017, Joyent, Inc.
   * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
   */
  
  /*
   * DTrace - Dynamic Tracing for Solaris
--- 19,29 ----
   * CDDL HEADER END
   */
  
  /*
   * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2018, Joyent, Inc.
   * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
   */
  
  /*
   * DTrace - Dynamic Tracing for Solaris
*** 3537,3546 ****
--- 3537,3565 ----
                  if ((lwp = curthread->t_lwp) == NULL)
                          return (0);
  
                  return ((uint64_t)lwp->lwp_errno);
          }
+ 
+         case DIF_VAR_THREADNAME:
+                 /*
+                  * See comment in DIF_VAR_PID.
+                  */
+                 if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+                         return (0);
+ 
+                 if (curthread->t_name == NULL)
+                         return (0);
+ 
+                 /*
+                  * Once set, ->t_name itself is never changed: any updates are
+                  * made to the same buffer that we are pointing out.  So we are
+                  * safe to dereference it here.
+                  */
+                 return (dtrace_dif_varstr((uintptr_t)curthread->t_name,
+                     state, mstate));
+ 
          default:
                  DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
                  return (0);
          }
  }