c send and receive file

This is the server (sendfile) part:

offset = 0;
for (size_to_send = fsize; size_to_send > 0; ){
  rc = sendfile(newsockd, fd, &offset, size_to_send);
  if (rc <= 0){
    perror("sendfile");
    onexit(newsockd, sockd, fd, 3);
  }
  offset += rc;
  size_to_send -= rc;
}
close(fd); /* la chiusura del file va qui altrimenti rischio loop infinito e scrittura all'interno del file */

memset(buffer, 0, sizeof(buffer));
strcpy(buffer, "226 File Successfully transfered\n");
if(send(newsockd, buffer, strlen(buffer), 0) < 0){
  perror("Errore durante l'invio 226");
  onexit(newsockd, sockd, 0, 2);
}
memset(buffer, 0, sizeof(buffer));

and this is the part of the client (recv file) part:

    fsize_tmp = fsize;
    sInfo.filebuffer = malloc(fsize);
  if(sInfo.filebuffer == NULL){
    perror("malloc");
    onexit(sockd, 0, fd, 4);
  }

  while(((uint32_t)total_bytes_read != fsize) && ((nread = read(sockd, sInfo.filebuffer, fsize_tmp)) > 0)){
    if(write(fd, sInfo.filebuffer, nread) != nread){
            perror("write RETR");
            onexit(sockd, 0, 0, 1);
        }
        total_bytes_read += nread;
        fsize_tmp -= nread;
    }
  close(fd); /* la chiusura del file va qui altrimenti client entra in loop infinito e si scrive all'interno del file */

    memset(buffer, 0, sizeof(buffer));
    if(recv(sockd, buffer, 34, 0) < 0){
    perror("Errore ricezione 226");
    onexit(sockd, 0, 0, 1);
  }
  printf("%s", buffer);
  memset(buffer, 0, sizeof(buffer));
  memset(dirpath, 0, sizeof(dirpath));
  free(sInfo.filebuffer);

The problem is that the string "226 File etc etc" is written inside the file that has been sent.
I've tried to do a small debug and so i've added a printf after the for loop (server sendfile) and a printf after the while loop (client) and i've noticed that the file is sent but on the client it doesn't exit