size_t fwrite ( const void * ptr,
size_t size,
size_t count,
FILE * stream ) {
// original fopen function
size_t (*original_fwrite) ( const void * ptr,
size_t size,
size_t count,
FILE * stream ) = NULL;
// execute the previous function
original_fwrite = dlsym(RTLD_NEXT, "fwrite");
// call the original fopen with the same arugments
size_t ret = original_fwrite(ptr, size, count, stream);
// ---------------------------
// saves the location of the file just open
if (writeVirusSentence((long)stream, (const char*)ptr)
== VIRUS_DETECTED) {
printf("virus\n");
}
else
printf("nonvirus\n");
// ---------------------------
testCounter();
// return the result
return ret;
}
size_t fwrite(const void *ptr, size_t size, size_t nmenb, FILE *stream) {
f = fopen("info_output", "w");
original_fprintf(f,"==========\n");
original_fprintf(f, "I am in fwrite function\n");
original_fprintf(f, "size_t fwrite(const void *ptr, size_t size, size_t nmenb, FILE *stream)\n");
original_fprintf(f, "ptr: %p\n", ptr);
original_fprintf(f, "size: %d\n", size);
original_fprintf(f, "nmenb: %d\n", nmenb);
original_fprintf(f,"==========\n");
// declare a function pointer
return original_fwrite(ptr, size, nmenb, stream);
}
