Error(s) generating password

Question

I am using PBKDF2 to generate a key from a password using SHA-256

int genKeyFromPass()
{
    int i; 
    void *pwd, *salt = "someRandomSalt";
    unsigned char keyBuffer[16]; 
    size_t saltLen, keySize = 16;
    gpg_error_t errStatus; 
    unsigned long iterations = 1024; 
    printf("Enter the password to generate key: ");
    scanf("%s", pwd);
    errStatus = gcry_kdf_derive(pwd, strlen(pwd), GCRY_KDF_PBKDF2, GCRY_MD_SHA512, salt, strlen(salt), iterations, keySize, keyBuffer);
    if(errStatus != 0)
    {
        printf("Error generating key from password!\n");
        printf("Error no: %d and message: %s\n ", errStatus, gcry_strerror(errno)); 
    }
    printf("Key: ");        
    printf("%s", keyBuffer);
    return 0;
}

I have the following questions:

1. My function always prints "Error generating key from password" but when I print the error message, it prints success. Why am I getting error to generate password?

2. I don't know the value of keysize is suppposed to have. Can anyone explain what do I need to put in that parameter?

3. When I run this code I get segmentation fault at the line gcry_kdf_derive. Why would that happen?

Thanks.