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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

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