Forking -each kid read and sort array and free it when done

[Despairy]

i have an assigment to fork the main program to 4 sons
each will sort an array in a different way

for (sonID=0;sonID<4;sonID++)
	{	
		status=fork();
		if (status<0)
			error("Can't Fork!");
		if (status==0)
		{
			checkFiles(argc,argv,&in,&out,sonID);// opening the files for use
			readFromFile(&nameList,&sizeOfList,&numOfStrings,in);
			sortArray(numOfStrings,&nameList,sonID);
			outputToFile(nameList,numOfStrings,out); //output the array to out file
			freeArray(sizeOfList,nameList); //freeing the whole array cells
			closeFiles(&in,&out); // closing the files		
		}
	}
	for (sonID=0;sonID<4;sonID++)
	{
		wait(&status);
	}

now if i call freeArray i get

*** glibc detected *** double free or corruption (fasttop): 0x09fb94e8 ***

and first file has the array 2nd file has 2xarray 3rd has 4xarrays etc...
and if i dont call it the files dont have anything in them except the first one
any ideas?

freeArray is simple

void freeArray(const int sizeOfList,char **nameList)
{
	int index;
	for (index=0;index<sizeOfList;index++)
		free (nameList[index]);
	free(nameList);
}

and here is the opening file function (dont think the problam is there but who knows )

char *fileName;
	switch(sonID){
		case(SONONE):fileName="id_up.out";
			break;
		case(SONTWO):fileName="name_down.out";
			break;
		case(SONTHREE):fileName="name_up.out";
			break;
		case(SONFOUR):fileName="id_down.out";
			break;
		default:break;
	}
	if (argc!=CORRECT_PARAMETERS) error("Bad Number of parameters");
		
	if (argc>FIRST_INPUT)
	{	
		*in = fopen(argv[FIRST_INPUT], "r");
		
		if (*in==NULL)
			error("Can't open input file");
	}
	else
			error("No 1st Input. go to README for insturctions.");

	*out = fopen(fileName, "w");

	if (*out==NULL) error("Can't open output file");

cheers thanks!

[Despairy]

i moved everything from the loop into a function and now it works
without errors .... any idea why?
thought i now encounter another problem after the output to files
this is the main

for (sonID=0;sonID<4;sonID++)
	{	
		status=fork();
		if (status<0)
			error("Can't Fork!");
		if (status==0)
		{
			doSon(argc,argv,sonID);
		}
	}
	for (sonID=0;sonID<4;sonID++)
	{
		wait(&status);
	}
	
	for (sonID=0;sonID<4;sonID++)
	{	
		status=fork();
		if (status<0)
			error("Can't Fork!");
		if (status==0)
		{
			doSonPrint(sonID);
		}
	}
	for (sonID=0;sonID<4;sonID++)
	{
		wait(&status);
	}

and dosonprint is

void doSonPrint(sonID)
{
	printf("son number %d\n",sonID);
	if (sonID==0)
		if((execlp("cat","cat","id_up.out",NULL)!=0))
								perror("execlp error");
}

now this should be called only once but i get the file posted in my stdout
like 15 times.
thanks for trying ... :(

[Despairy]

the whole problem... is because i forgot one thing
found out just now .... exit(1) at end of each child
thanks and sorry for being dumb wasting too many hours
and your time reading