main.c   [plain text]

// BUILD:  $CC foo.c -dynamiclib -o $BUILD_DIR/libfoo.dylib -install_name $RUN_DIR/libfoo.dylib
// BUILD:  $CC main.c $BUILD_DIR/libfoo.dylib -o $BUILD_DIR/interpose-malloc.exe
// BUILD:  $DYLD_ENV_VARS_ENABLE $BUILD_DIR/interpose-malloc.exe
// BUILD:  $CC interposer.c -dynamiclib -o $BUILD_DIR/libmyalloc.dylib -install_name libmyalloc.dylib

// RUN:    DYLD_INSERT_LIBRARIES=libmyalloc.dylib   ./interpose-malloc.exe



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

extern void* myalloc1(size_t);
extern void* myalloc2(size_t);

int main()
{
    printf("[BEGIN] interpose-malloc\n");

    char* p1 = malloc(10);
    if ( strncmp(p1+10, "##########", 10) != 0 ) {
        printf("[FAIL] interpose-malloc malloc() from main executable not interposed\n");
        return 0;
    }

    void* p2 = myalloc1(6);
    if ( strncmp(p2+6, "######", 6) != 0 ) {
        printf("[FAIL] interpose-malloc myalloc1() from libfoo.dylib not interposed\n");
        return 0;
    }

    void* p3 = myalloc2(10);
    if ( strncmp(p3+10, "##########", 10) != 0 ) {
        printf("[FAIL] interpose-malloc myalloc2() from libfoo.dylib not interposed\n");
        return 0;
    }

    void* p4 = strdup("hello");
     if ( strncmp(p4+6, "#######", 6) != 0 ) {
        printf("[FAIL] interpose-malloc malloc() from strdup not interposed\n");
        return 0;
    }

    //printf("%p %p %p %p\n", p1, p2, p3, p4);
    printf("[PASS] interpose-malloc\n");
	return 0;
}