Cygwin: drop PROC_DETACHED_CHILD flag

pinfo::remember with the detach parameter set to true is
the only way to call proc_subproc with PROC_DETACHED_CHILD.
This call is exclusively used in spawn to set up a pinfo for
a detached child, and that pinfo goes out of scope right
afterwards without any further action.

Drop the flag and drop the detach parameter from pinfo::remember.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/fork.cc

@@ -415,7 +415,7 @@ frok::parent (volatile char * volatile stack_here)
      it in afterwards.  This requires more bookkeeping than I like, though,
      so we'll just do it the easy way.  So, terminate any child process if
      we can't actually record the pid in the internal table. */
-  if (!child.remember (false))
+  if (!child.remember ())
     {
       this_errno = EAGAIN;
 #ifdef DEBUGGING0

winsup/cygwin/pinfo.h

@@ -196,10 +196,9 @@ public:
     destroy = res ? false : true;
     return res;
   }
-  int remember (bool detach)
+  int remember ()
   {
-    int res = proc_subproc (detach ? PROC_DETACHED_CHILD : PROC_ADD_CHILD,
-			    (uintptr_t) this);
+    int res = proc_subproc (PROC_ADD_CHILD, (uintptr_t) this);
     destroy = res ? false : true;
     return res;
   }

winsup/cygwin/sigproc.cc

@@ -205,9 +205,6 @@ proc_subproc (DWORD what, uintptr_t val)
 	  set_errno (EAGAIN);
 	  break;
 	}
-      fallthrough;
-
-    case PROC_DETACHED_CHILD:
       if (vchild != myself)
 	{
 	  vchild->uid = myself->uid;
@@ -217,8 +214,7 @@ proc_subproc (DWORD what, uintptr_t val)
 	  vchild->ctty = myself->ctty;
 	  vchild->cygstarted = true;
 	  vchild->process_state |= PID_INITIALIZING;
-	  vchild->ppid = what == PROC_DETACHED_CHILD
-				 ? 1 : myself->pid;	/* always set last */
+	  vchild->ppid = myself->pid;	/* always set last */
 	}
       break;
 
@@ -879,7 +875,7 @@ void
 child_info_spawn::wait_for_myself ()
 {
   postfork (myself);
-  if (myself.remember (false))
+  if (myself.remember ())
     myself.attach ();
   WaitForSingleObject (ev, INFINITE);
 }

winsup/cygwin/sigproc.h

@@ -33,11 +33,10 @@ enum procstuff
   PROC_ADD_CHILD	  = 1,	// set up a new child
   PROC_ATTACH_CHILD	  = 2,	// attach child or reattach after exec
   PROC_EXEC_CLEANUP	  = 3,	// cleanup waiting children after exec
-  PROC_DETACHED_CHILD	  = 4,	// set up a detached child
-  PROC_CLEARWAIT	  = 5,	// clear all waits - signal arrived
-  PROC_WAIT		  = 6,	// setup for wait() for subproc
-  PROC_EXECING		  = 7,	// used to get a lock when execing
-  PROC_NOTHING		  = 8	// nothing, really
+  PROC_CLEARWAIT	  = 4,	// clear all waits - signal arrived
+  PROC_WAIT		  = 5,	// setup for wait() for subproc
+  PROC_EXECING		  = 6,	// used to get a lock when execing
+  PROC_NOTHING		  = 7	// nothing, really
 };
 
 struct sigpacket

winsup/cygwin/spawn.cc

@@ -867,9 +867,8 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
 	  child->start_time = time (NULL); /* Register child's starting time. */
 	  child->nice = myself->nice;
 	  postfork (child);
-	  if (mode == _P_DETACH
-	      ? !child.remember (true)
-	      : !(child.remember (false) && child.attach ()))
+	  if (mode != _P_DETACH
+	      && (!child.remember () || !child.attach ()))
 	    {
 	      /* FIXME: Child in strange state now */
 	      CloseHandle (pi.hProcess);