GetExitCodeProcess() zwraca wartości których nie rozumiem

Question

Cześć. Tak jak w temacie - nie potrafię poprawnie wyświetlić wartości które chcę dostać z GetExitCodeProcess(). Po uruchomieniu programu z argumentem 5, w ostatniej kolumnie powinny być to cyfry od 1 do 5:

 

 

 

 

 

 

 

 

 

#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[]) {
STARTUPINFO si;
    PROCESS_INFORMATION pi1;
	PROCESS_INFORMATION pi2;
	char argline[20];
    memset(&si, 0, sizeof(si));
    memset(&pi1, 0, sizeof(pi1));
    memset(&pi2, 0, sizeof(pi2));
	unsigned int currentID = GetCurrentProcessId();
	unsigned int child2ID;
	unsigned int child1ID;
    si.cb = sizeof(si);
	int pass1 = d - 1;
	int pass2 = d - 2;
    sprintf(argline, "lab09.exe %d", pass1);
    if (CreateProcessA(NULL, argline, NULL, NULL, 0, 0, NULL, NULL, &si, &pi1) == 0) {
		fprintf(stderr, "wywolanie procesu 1 niepowiodlo sie");
    }else{
		child1ID = GetProcessId(pi1.hProcess);
	}
    sprintf(argline, "lab09.exe %d", pass2);
    if (CreateProcessA(
					NULL,		//lpApplicationName
					argline,	//lpCommandLine
					NULL,		//lpProcessAttributes
					NULL,		//lpThreadAttributes
					0,			//bInheritHandles
					0,			//dwCreationFlags
					NULL, 		//lpEnvironment
					NULL, 		//lpCurrentDirectory
					&si, 		//lpStartupInfo
					&pi2		//lpProcessInformation
					) == 0) {
		fprintf(stderr, "wywolanie procesu 2 niepowiodlo sie");
    }else{
		child2ID = GetProcessId(pi2.hProcess);
	}
	
	DWORD exit1;
	GetExitCodeProcess(pi1.hProcess, &exit1);
	DWORD exit2;
	GetExitCodeProcess(pi2.hProcess, &exit2);
	
    WaitForSingleObject(pi1.hProcess, INFINITE);
    CloseHandle(pi1.hProcess);
    CloseHandle(pi1.hThread);

    WaitForSingleObject(pi2.hProcess, INFINITE);
    CloseHandle(pi2.hProcess);
    CloseHandle(pi2.hThread);

	fprintf(stdout, "\n%d\t%d\t%d\t%d", currentID, child1ID, pass1, exit1);
	fprintf(stdout, "\n%d\t%d\t%d\t%d", currentID, child2ID, pass2, exit2);
	fprintf(stdout, "\n%d\t\t\t%d\n", currentID, exit1+exit2);

	exit(exit1+exit2);
}

 

Comments

exit(exit1+exit2);

Po co to? Nie wystarczy po prostu return exit1 + exit2; ?

Answer 1

Oj. Nie doczytałeś dokumentacji!
https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getexitcodeprocess

Important  The GetExitCodeProcess function returns a valid error code defined by the application only after the thread terminates. Therefore, an application should not use STILL_ACTIVE (259) as an error code. If a thread returns STILL_ACTIVE (259) as an error code, applications that test for this value could interpret it to mean that the thread is still running and continue to test for the completion of the thread after the thread has terminated, which could put the application into an infinite loop.

Comments

[...]
    DWORD exit1;
	GetExitCodeProcess(pi1.hProcess, &exit1);
	DWORD exit2;
	GetExitCodeProcess(pi2.hProcess, &exit2);
	
    WaitForSingleObject(pi1.hProcess, INFINITE);
    WaitForSingleObject(pi2.hProcess, INFINITE);
	
	if (GetExitCodeProcess(pi1.hProcess, &exit1) == FALSE){
		fprintf(stderr, "GetExitCodeProcess() zwrocil blad\n");
	}else{
        fprintf(stdout, "\n%d\t%d\t%d\t%d", currentID, child1ID, pass1, exit1);
	}	
	if (GetExitCodeProcess(pi2.hProcess, &exit2) == FALSE){
		fprintf(stderr, "GetExitCodeProcess() zwrocil blad\n");
	}else{
		fprintf(stdout, "\n%d\t%d\t%d\t%d", currentID, child2ID, pass2, exit2);
	}
	
	fprintf(stdout, "\n%d\t\t\t%d\n", currentID, exit1+exit2);
	
	CloseHandle(pi1.hProcess);
    CloseHandle(pi1.hThread);
	CloseHandle(pi2.hProcess);
    CloseHandle(pi2.hThread);

	return exit1+exit2;

Tak wygląda rozwiązanie mojego problemu, może komuś kiedyś się przyda.