* src/process.c (wait_reading_process_output): Handle pty disconnect

by refraining from sending oneself a SIGCHLD.

Fixes: debbugs:10933

src/ChangeLog

+2012-03-23  Troels Nielsen  <bn.troels@gmail.com>  (tiny change)
+
+	* process.c (wait_reading_process_output): Handle pty disconnect
+	by refraining from sending oneself a SIGCHLD (bug#10933).
+
 2012-03-22  Chong Yidong  <cyd@gnu.org>
 
 	* dispextern.h (struct it): New member string_from_prefix_prop_p.
 
-	* xdisp.c (push_prefix_prop): Renamed from push_display_prop.
+	* xdisp.c (push_prefix_prop): Rename from push_display_prop.
 	Mark string as coming from a prefix property.
 	(handle_face_prop): Use default face for prefix strings (Bug#4281).
 	(pop_it, reseat_1): Save and restore string_from_prefix_prop_p.
@@ -14,8 +19,8 @@
 2012-03-20  Eli Zaretskii  <eliz@gnu.org>
 
 	* w32proc.c (Fw32_set_console_codepage)
-	(Fw32_set_console_output_codepage, Fw32_get_codepage_charset): Doc
-	fixes.
+	(Fw32_set_console_output_codepage, Fw32_get_codepage_charset):
+	Doc fixes.
 
 2012-03-20  Chong Yidong  <cyd@gnu.org>
 

src/process.c

@@ -4888,15 +4888,20 @@ wait_reading_process_output (int time_limit, int microsecs, int read_kbd,
 		 It can't hurt.  */
 	      else if (nread == -1 && errno == EIO)
 		{
-		  /* Clear the descriptor now, so we only raise the signal once.  */
-		  FD_CLR (channel, &input_wait_mask);
-		  FD_CLR (channel, &non_keyboard_wait_mask);
-
-		  kill (getpid (), SIGCHLD);
+                  /* Don't do anything if only a pty, with no associated
+		     process (bug#10933).  */
+                  if (XPROCESS (proc)->pid != -2) {
+                    /* Clear the descriptor now, so we only raise the signal
+		       once.  */
+                    FD_CLR (channel, &input_wait_mask);
+                    FD_CLR (channel, &non_keyboard_wait_mask);
+                    
+                    kill (getpid (), SIGCHLD);
+                  }
 		}
 #endif /* HAVE_PTYS */
-	      /* If we can detect process termination, don't consider the process
-		 gone just because its pipe is closed.  */
+	      /* If we can detect process termination, don't consider the
+		 process gone just because its pipe is closed.  */
 #ifdef SIGCHLD
 	      else if (nread == 0 && !NETCONN_P (proc) && !SERIALCONN_P (proc))
 		;