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#include <stdio.h>
int tst(int len,char str[1024]){
printf("called c from perl len:'%i'  str:'%s'  \n",len, str);
...
tst(54,"char");
return 1;
}

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compiled well, but this 
use TST;
TST::test(4444,"ss");

prints called c from perl len:'4444'  str:'(null)'