C Programming Sockets
Low-level I/O in C
Processes and signalling
5 code blocks total in server_getFileByFirstLetter. c
Please finish the server of a client-server application. The client asks the user for a letter (a character in {A-Z, a-z}), and then sends that letter to the server. The server fork()s a child to handle the client, and that child process:
1. Gets the letter from the client
2. Attempts to open the current directory ("."). If it cannot open that directory then it:
-sends CANT_READ_DIR_CODE back to the client (in network endian),
-prints "Cannot read directory\n",
-returns.
3. Iterates thru the directory to looking for a file (not a directory or anything else) whose name starts with the letter obtained from the client.
4. If the server finds no matching file then it
-sends NO_MATCH_CODE back to the client (in network endian),
-prints "No matching file\n",
-returns.
5. Attempts to open the file for reading. If it cannot open the file then it:
-sends CANT_READ_FILE_CODE back to the client (in network endian),
-prints "Cannot read file \n",
-returns.
6. Prints "Sending , bytes\n"
7. Sends the size of the file as a uint32_t integer to the client (in network endian)
8. Sends the bytes of the file to the client. It should send the file in buffers of bytes of size BUFFER_LEN.
9. close()s what it should close.
Code: Complete the five your code here sections in server_getFileByFirstLetter. c program. Two additonal files are below for reference: