fwrite() 没有完成写入文件

Question

Trying to send a file from client to server.

This is how I receive it:

printf("Server receiving file...\n");
while((bytes_read = read(sd, buf, sizeof(buf))) > 0){ //second read now retrieving the file size
  printf("writing");
  fwrite(buf, 1, bytes_read, fp);
  printf("checking if reached here");
}

For some reason, the second print statement "checking if reached here" is never reached, and the program just doesn't exit the loop. What could be the issue?

PS. My client sends all the bytes so there is no issue with sending. Its only the writing to the file

Answer 1

Is the socket blocking (the default) ?

If it is, whenever there is no data to read, the read() will hang, waiting for more data (or for the socket to close, in which case it will return 0 bytes).

Answer 2

Did you open the file using the fopen function? Here is a small example regarding a piece of code you should have somewhere in your script.

fp = fopen( "file", "w" );

Check if you have a similar line somewhere, otherwise you will need to add this.