c - continously allocate the memory to crash the system and how to block it for standard users -

hi tried allocate memory continuously using calloc function . system memory gets filled , crashed. worst part if standard user , if able run program system crashing . how can block happen standard user.

code used :

#include <stdio.h> #include <stdlib.h>  int main() {   while(1)   {     int *abc;     abc=(int*)calloc(1000,sizeof(int));    } } 

there might way block , or else user gets ssh access can crash system .

you can set various memory limits.

ulimit springs mind. can set shell (see http://unixhelp.ed.ac.uk/cgi/man-cgi?ulimit). there way of setting them system wide. there file stores these off top of head cannot remember located. need google it.