+ return execData.exitcode;
+#else // !wxUSE_SELECT_DISPATCHER
+ wxFAIL_MSG( wxS("Can't block until child exit without wxSelectDispatcher") );
+
+ return -1;
+#endif // wxUSE_SELECT_DISPATCHER/!wxUSE_SELECT_DISPATCHER
+}
+
+} // anonymous namespace
+
+// wxExecute: the real worker function
+long wxExecute(char **argv, int flags, wxProcess *process,
+ const wxExecuteEnv *env)
+{
+ // for the sync execution, we return -1 to indicate failure, but for async
+ // case we return 0 which is never a valid PID
+ //
+ // we define this as a macro, not a variable, to avoid compiler warnings
+ // about "ERROR_RETURN_CODE value may be clobbered by fork()"
+ #define ERROR_RETURN_CODE ((flags & wxEXEC_SYNC) ? -1 : 0)
+
+ wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
+
+#if wxUSE_THREADS
+ // fork() doesn't mix well with POSIX threads: on many systems the program
+ // deadlocks or crashes for some reason. Probably our code is buggy and
+ // doesn't do something which must be done to allow this to work, but I
+ // don't know what yet, so for now just warn the user (this is the least we
+ // can do) about it
+ wxASSERT_MSG( wxThread::IsMain(),
+ wxT("wxExecute() can be called only from the main thread") );
+#endif // wxUSE_THREADS
+
+#if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
+ // wxMacLaunch() only executes app bundles and only does it asynchronously.
+ // It returns false if the target is not an app bundle, thus falling
+ // through to the regular code for non app bundles.
+ if ( !(flags & wxEXEC_SYNC) && wxMacLaunch(argv) )
+ {
+ // we don't have any PID to return so just make up something non null
+ return -1;
+ }
+#endif // __DARWIN__
+
+ // this struct contains all information which we use for housekeeping
+ wxScopedPtr<wxExecuteData> execDataPtr(new wxExecuteData);
+ wxExecuteData& execData = *execDataPtr;
+
+ execData.flags = flags;
+ execData.process = process;
+
+ // create pipes for inter process communication
+ wxPipe pipeIn, // stdin
+ pipeOut, // stdout
+ pipeErr; // stderr
+
+ if ( process && process->IsRedirected() )
+ {
+ if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
+ {
+ wxLogError( _("Failed to execute '%s'\n"), *argv );
+
+ return ERROR_RETURN_CODE;
+ }
+ }
+
+ // priority: we need to map wxWidgets priority which is in the range 0..100
+ // to Unix nice value which is in the range -20..19. As there is an odd
+ // number of elements in our range and an even number in the Unix one, we
+ // have to do it in this rather ugly way to guarantee that:
+ // 1. wxPRIORITY_{MIN,DEFAULT,MAX} map to -20, 0 and 19 respectively.
+ // 2. The mapping is monotonously increasing.
+ // 3. The mapping is onto the target range.
+ int prio = process ? process->GetPriority() : 0;
+ if ( prio <= 50 )
+ prio = (2*prio)/5 - 20;
+ else if ( prio < 55 )
+ prio = 1;
+ else
+ prio = (2*prio)/5 - 21;
+
projects / wxWidgets.git / blobdiff