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I think i found some error in the source!   In the crypto\bio\bss_bio.c file there is the following function:   static size_t bio_nwrite0(BIO *bio, char **buf)  {  struct bio_bio_st *b;  size_t num;  size_t write_offset;    BIO_clear_retry_flags(bio);    if (!bio->init)   return 0;    b = bio->ptr;   assert(b != NULL);  assert(b->peer != NULL);  assert(b->buf != NULL);    b->request = 0;  if (b->closed)   {   BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE);   return -1;   }    assert(b->len <= b->size);    if (b->len == b->size)   {   BIO_set_retry_write(bio);   return -1;   }    num = b->size - b->len;  write_offset = b->offset + b->len;  if (write_offset >= b->size)   write_offset -= b->size;  if (write_offset + num > b->size)   /* no ring buffer wrap-around for non-copying interface    * (to fulfil the promise by BIO_ctrl_get_write_guarantee,    * BIO_nwrite may have to be called twice) */   num = b->size - write_offset;    if (buf != NULL)   *buf = b->buf + write_offset;  assert(write_offset + num <= b->size);    return num;  }   I tried to compile by MS-VC it but I got error. The function tries to return -1 but the type of the return value is size_t which is declared as unsigned int. I dont know how to correct this. Is a good solution to return 0? Is there someone who maintains the code?   Thanks a lot!