This function checks the status of an external program and to release the handle once the program exits.
Input:
handle : SYSHANDLE
A handle to the program to check the status of.
Output:
handle : SYSHANDLE
If the program is stopped, the handle is released and made invalid.
code : DINT
The status code of an exited program or the signal that caused the status of the program to change.
Returns: INT
3
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- The program is stopped. Code contains the signal that made it stop.
|
2
|
- The program is terminated because of a signal. Code contains the signal that made it terminate. Handle has been made invalid.
|
1
|
- The program has exited normally. Code contains the status code from the program. Handle has been made invalid.
|
0
|
- The program is still running.
|
-1
|
- Handle is not valid.
|
-2
|
- Error checking the status. A likely cause is that the process has ended and the status has already been checked.
|
Declaration:
FUNCTION extProgramStatus : INT;
VAR_INPUT
handle : ACCESS SYSHANDLE;
code : ACCESS DINT;
END_VAR;
Example:
INCLUDE rtcu.inc
PROGRAM test;
VAR
rc : INT;
signal : DINT;
handle : SYSHANDLE;
END_VAR;
BEGIN
...
fsMediaOpen(media := 1);
rc := extProgramStart(handle := handle, path := "B:\SYSTEM\EXT\SERVER.RPX",
args := "-port 3490 -name $"test server$"");
DebugFmt(message := "Server started: \1", v1 := rc);
...
rc := extProgramSignal(handle := handle, signal := 9);
DebugFmt(message := "Send kill: \1", v1 := rc);
rc := extProgramStatus(handle := handle, code := signal);
IF rc = 2 THEN
DebugFmt(message := "Program was terminated with the \4 signal", v4 := signal);
END_IF;
END;
END_PROGRAM;
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