wxProcess fixes (Detach() added), cleared/corrected wxExecute() documentation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1709 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/function.tex

@@ -946,11 +946,12 @@ arguments, terminated by NULL.
 If {\it sync} is FALSE (the default), flow of control immediately returns.
 If TRUE, the current application waits until the other program has terminated.
 
-If execution is asynchronous, the return value is the process id,
-otherwise it is a status value.  A zero value indicates that the command could not
-be executed.
+The return value is the process id, not the exit code of invoked program (for
+this you should use wxProcess). A zero value indicates that the command could
+not be executed.
 
-If callback isn't NULL and if execution is asynchronous, 
+If callback isn't NULL and if execution is asynchronous (note that callback
+parameter can not be non NULL for synchronous execution), 
 \helpref{wxProcess::OnTerminate}{wxprocessonterminate} will be called when
 the process finishes.
 

docs/latex/wx/process.tex

@@ -1,8 +1,18 @@
 \section{\class{wxProcess}}\label{wxprocess}
 
-This class contains a method which is invoked when a process finishes.
-It can raise a \helpref{wxProcessEvent}{wxprocessevent} if wxProcess::OnTerminate
-isn't overriden.
+The objects of this class are used in conjonction with 
+\helpref{wxExecute}{wxexecute} function. When a wxProcess object is passed to
+wxExecute(), its \helpref{OnTerminate()}{wxprocessonterminate} virtual method
+is called when the process terminates. This allows the program to be
+(asynchronously) notified about the process termination and also retrieve its
+exit status which is unavailable from wxExecute() in the case of
+asynchronous execution.
+
+Please note that if the process termination notification is processed by the
+parent, it is responsible for deleting the wxProcess object which sent it.
+However, if it is not processed, the object will delete itself and so the
+library users should only delete those objects whose notifications have been
+processed (and call \helpref{Detach()}{wxprocessdetach} for others).
 
 \wxheading{Derived from}
 
@@ -22,6 +32,10 @@ Constructs a process object. {\it id} is only used in the case you want to
 use wxWindows events. It identifies this object, or another window that will
 receive the event.
 
+If the {\it parent} parameter is different from NULL, it will receive
+a wxEVT\_END\_PROCESS notification event (you should insert EVT\_END\_PROCESS
+macro in the event table of the parent to handle it) with the given {\it id}.
+
 \wxheading{Parameters}
 
 \docparam{parent}{The event handler parent.}
@@ -34,12 +48,28 @@ receive the event.
 
 Destroys the wxProcess object.
 
+\membersection{wxProcess::Detach}\label{wxprocessdetach}
+
+\func{void}{Detach}{\void}
+
+Normally, a wxProcess object is deleted by its parent when it receives the
+notification about the process termination. However, it might happen that the
+parent object is destroyed before the external process is terminated (e.g. a
+window from which this external process was launched is closed by the user)
+and in this case it {\bf should not delete} the wxProcess object, but 
+{\bf should call Detach()} instead. After the wxProcess object is detached
+from its parent, no notification events will be sent to the parent and the
+object will delete itself upon reception of the process termination
+notification.
+
 \membersection{wxProcess::OnTerminate}\label{wxprocessonterminate}
 
-\constfunc{void}{OnTerminate}{\param{int}{ pid}}
+\constfunc{void}{OnTerminate}{\param{int}{ pid}, \param{int}{ status}}
 
 It is called when the process with the pid {\it pid} finishes.
 It raises a wxWindows event when it isn't overriden.
 
-\docparam{pid}{The pid of the process which ends.}
+\docparam{pid}{The pid of the process which has just terminated.}
+
+\docparam{status}{The exit code of the process.}
 

include/wx/process.h

@@ -2,7 +2,7 @@
 // Name:        process.h
 // Purpose:     wxProcess class
 // Author:      Guilhem Lavaux
-// Modified by:
+// Modified by: Vadim Zeitlin to check error codes, added Detach() method
 // Created:     24/06/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Guilhem Lavaux
@@ -55,6 +55,10 @@ public:
 
     virtual void OnTerminate(int pid, int status);
 
+    // detach from the parent - should be called by the parent if it's deleted
+    // before the process it started terminates
+    void Detach();
+
 protected:
     int m_id;
 };

src/common/process.cpp

@@ -2,7 +2,7 @@
 // Name:        process.cpp
 // Purpose:     Process termination classes
 // Author:      Guilhem Lavaux
-// Modified by:
+// Modified by: Vadim Zeitlin to check error codes, added Detach() method
 // Created:     24/06/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
@@ -41,5 +41,13 @@ void wxProcess::OnTerminate(int pid, int status)
 {
     wxProcessEvent event(m_id, pid, status);
 
-  ProcessEvent(event);
+    if ( !ProcessEvent(event) )
+        delete this;
+    //else: the object which processed the event is responsible for deleting
+    //      us!
+}
+
+void wxProcess::Detach()
+{
+    SetNextHandler(NULL);
 }

src/gtk/utilsgtk.cpp

@@ -320,6 +320,7 @@ long wxExecute( char **argv, bool sync, wxProcess *process )
     {
         // we're in child
         close(end_proc_detect[0]); // close reading side
+
         // These three lines close the open file descriptors to
         // to avoid any input/output which might block the process
         // or irritate the user. If one wants proper IO for the sub-
@@ -328,6 +329,7 @@ long wxExecute( char **argv, bool sync, wxProcess *process )
         close(STDIN_FILENO);
         close(STDOUT_FILENO);
         close(STDERR_FILENO);
+
         // some programs complain about sterr not being open, so
         // redirect them:
         open("/dev/null", O_RDONLY);  // stdin
@@ -340,6 +342,7 @@ long wxExecute( char **argv, bool sync, wxProcess *process )
 #else
         execvp (*argv, argv);
 #endif
+
         // there is no return after successful exec()
         wxLogSysError( "Can't execute '%s'", *argv);
 

src/gtk1/utilsgtk.cpp

@@ -320,6 +320,7 @@ long wxExecute( char **argv, bool sync, wxProcess *process )
     {
         // we're in child
         close(end_proc_detect[0]); // close reading side
+
         // These three lines close the open file descriptors to
         // to avoid any input/output which might block the process
         // or irritate the user. If one wants proper IO for the sub-
@@ -328,6 +329,7 @@ long wxExecute( char **argv, bool sync, wxProcess *process )
         close(STDIN_FILENO);
         close(STDOUT_FILENO);
         close(STDERR_FILENO);
+
         // some programs complain about sterr not being open, so
         // redirect them:
         open("/dev/null", O_RDONLY);  // stdin
@@ -340,6 +342,7 @@ long wxExecute( char **argv, bool sync, wxProcess *process )
 #else
         execvp (*argv, argv);
 #endif
+
         // there is no return after successful exec()
         wxLogSysError( "Can't execute '%s'", *argv);