--- a/src/process.c	Mon Aug 13 10:57:07 2007 +0200
+++ b/src/process.c	Mon Aug 13 10:57:55 2007 +0200
@@ -59,7 +59,7 @@
 #include "systty.h"
 #include "syswait.h"
 
-Lisp_Object Qprocessp;
+Lisp_Object Qprocessp, Qprocess_live_p;
 
 /* Process methods */
 struct process_methods the_process_methods;
@@ -256,6 +256,14 @@
   return PROCESSP (obj) ? Qt : Qnil;
 }
 
+DEFUN ("process-live-p", Fprocess_live_p, 1, 1, 0, /*
+Return t if OBJECT is a process that is alive.
+*/
+       (obj))
+{
+  return PROCESSP (obj) && PROCESS_LIVE_P (XPROCESS (obj)) ? Qt : Qnil;
+}
+
 DEFUN ("process-list", Fprocess_list, 0, 0, 0, /*
 Return a list of all processes.
 */
@@ -509,7 +517,7 @@
   pid = PROCMETH (create_process, (p, argv, nargv, program, cur_dir));
 
   p->pid = make_int (pid);
-  if (!NILP(p->pipe_instream))
+  if (PROCESS_LIVE_P (p))
     event_stream_select_process (p);
 }
 
@@ -815,7 +823,7 @@
      Really, the loop in execute_internal_event() should check itself
      for a process-filter change, like in status_notify(); but the
      struct Lisp_Process is not exported outside of this file. */
-  if (NILP(p->pipe_instream))
+  if (!PROCESS_LIVE_P (p))
     return -1; /* already closed */
 
   if (!NILP (p->filter) && (p->filter_does_read))
@@ -1024,7 +1032,7 @@
 set_process_filter (Lisp_Object proc, Lisp_Object filter, int filter_does_read)
 {
   CHECK_PROCESS (proc);
-  if (PROCESS_LIVE_P (proc)) {
+  if (PROCESS_LIVE_P (XPROCESS (proc))) {
     if (EQ (filter, Qt))
       event_stream_unselect_process (XPROCESS (proc));
     else
@@ -1113,6 +1121,7 @@
        (process))
 {
   process = get_process (process);
+  CHECK_LIVE_PROCESS (process);
   return decoding_stream_coding_system (XLSTREAM (XPROCESS (process)->coding_instream) );
 }
 
@@ -1122,6 +1131,7 @@
        (process))
 {
   process = get_process (process);
+  CHECK_LIVE_PROCESS (process);
   return encoding_stream_coding_system (XLSTREAM (XPROCESS (process)->coding_outstream));
 }
 
@@ -1131,6 +1141,7 @@
        (process))
 {
   process = get_process (process);
+  CHECK_LIVE_PROCESS (process);
   return Fcons (decoding_stream_coding_system
 		(XLSTREAM (XPROCESS (process)->coding_instream)),
 		encoding_stream_coding_system
@@ -1145,6 +1156,8 @@
 {
   codesys = Fget_coding_system (codesys);
   process = get_process (process);
+  CHECK_LIVE_PROCESS (process);
+
   set_decoding_stream_coding_system
     (XLSTREAM (XPROCESS (process)->coding_instream), codesys);
   return Qnil;
@@ -1158,6 +1171,8 @@
 {
   codesys = Fget_coding_system (codesys);
   process = get_process (process);
+  CHECK_LIVE_PROCESS (process);
+
   set_encoding_stream_coding_system
     (XLSTREAM (XPROCESS (process)->coding_outstream), codesys);
   return Qnil;
@@ -1519,9 +1534,7 @@
   if (network_connection_p (proc))
     error ("Network connection %s is not a subprocess",
 	   XSTRING_DATA (XPROCESS(proc)->name));
-  if (!PROCESS_LIVE_P (proc))
-    error ("Process %s is not active",
-	   XSTRING_DATA (XPROCESS(proc)->name));
+  CHECK_LIVE_PROCESS (proc);
 
   MAYBE_PROCMETH (kill_child_process, (proc, signo, current_group, nomsg));
 }
@@ -1875,7 +1888,7 @@
       p->tick++;
       process_tick++;
     }
-  else if (!NILP(p->pipe_instream))
+  else if (PROCESS_LIVE_P (p))
     {
       Fkill_process (proc, Qnil);
       /* Do this now, since remove_process will make sigchld_handler do nothing.  */
@@ -1907,7 +1920,7 @@
 	{
 	  if (network_connection_p (proc))
 	    Fdelete_process (proc);
-	  else if (!NILP (XPROCESS (proc)->pipe_instream))
+	  else if (PROCESS_LIVE_P (XPROCESS (proc)))
 	    process_send_signal (proc, SIGHUP, 0, 1);
 	}
     }
@@ -1966,6 +1979,7 @@
 syms_of_process (void)
 {
   defsymbol (&Qprocessp, "processp");
+  defsymbol (&Qprocess_live_p, "process-live-p");
   defsymbol (&Qrun, "run");
   defsymbol (&Qstop, "stop");
   defsymbol (&Qopen, "open");
@@ -1978,6 +1992,7 @@
 #endif
 
   DEFSUBR (Fprocessp);
+  DEFSUBR (Fprocess_live_p);
   DEFSUBR (Fget_process);
   DEFSUBR (Fget_buffer_process);
   DEFSUBR (Fdelete_process);