pandada8/main.md

Created September 24, 2016 01:48

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preload in mac

Raw

#include <stdlib.h>
#include <stdio.h>
#include <time.h>

int main() {
	srand(time(NULL));
	int i = 10;
	while (i --) {
		printf("%d\n", rand() * 100);
	}
	return 0;
}

preload.c

int rand() {
	return 42;
}

to run

gcc random_num.c -o random_num
gcc -dynamiclib preload.c -o preload.dylib
DYLD_FORCE_FLAT_NAMESPACE=1 DYLD_INSERT_LIBRARIES=preload.dylib ./random_num