allocation problem [static stack storage]

kranti · 10-18-2005, 01:26 AM

I've written a UDP client server multithreaded application in C in which I've declared one global char array which is a 2 dimensional array of size 10 by 256.
I'm processing this array in a function in which i'm opening one log file. This file gets opened successfully for 8 out of 10 times. If i increase the size from 10 to 50 the failure occures at 48th position. When i try to debug, the string (char array) containing the file path gets corrupted at the mentioned positions as the flow goes on & hence the file doesn't get opened.

Why does the file path get lost? Can there be any problem with respect to stack or heap storage?

jim mcnamara · 10-18-2005, 09:10 AM

You are overwriting your storage.
stack grows downward (toward larger addresses).

Code:

char tmp[32]={0x0};
int j=0;
memset(tmp,' ',34);

the memset call puts too many characters into tmp. The extra characters will end up in the "j" variable's memory space, depending on alignment.