A socket option from BSD UNIX included for backward compatibility. This option sets the minimum number of bytes to process for socket output operations. SO_TYPE: int: Returns the socket type for the given socket (SOCK_STREAM or SOCK_DGRAM, for example This socket option is not supported for the setting the socket type.
It waits here until a client contacts it. At that point, it receives a new socket, c, which it can use to communicate with this particular client. It uses the C function fdopen to turn the socket from a low-level file descriptor to a C-style FILE pointer. This will allow the use of fprintf later on. from the socket file descriptor using fdopen. After understanding I need two streams (one for reading and on for writing), now I'm able to send messages over socket using fprintf. Now the problem is the reception that I wanted to do with getline() function or similar. The big problem is I don't want it to block the RETURN VALUES. If successful, fdopen() returns a pointer to a stream. On failure, it returns a NULL pointer and errno is set to one of the following values: . EBADF . The fildes argument is not a valid file descriptor.. EINVAL . The value of the type argument is invalid.. EMFILE . Too many file descriptors are open in the calling process. By the way, socket.fdopen duplicates the descriptor, so it doesn't need to be explicitly discarded. The above code leaks rawfd. I'll accept a patch that adds an option to tell .fdopen to take ownership of the existing descriptor number. But because stale descriptors are perhaps the biggest source of bugs in asynchronous networking software, I Windows Sockets 2 is designed for use by C/C++ programmers. Familiarity with Windows networking is required. Run-time requirements. Windows Sockets 2 can be used on all Windows platforms. Where certain implementations or capabilities of Windows Sockets 2 platform restrictions do exist, they are clearly noted in the documentation. In this section
For socket programming, however, there is no stdio(3) call available to open a socket. How then does a programmer accomplish associating a stream with a socket? Read the next section to find out. Using fdopen(3) to Associate a Socket with a Stream. The function call fopen(3) should be quite familiar to you.
The t, c, and n mode options are Microsoft extensions for fopen and _fdopen.Do not use them if you want to preserve ANSI portability. If t or b is not given in mode, the default translation mode is defined by the global variable _fmode.If t or b is prefixed to the argument, the function fails and returns NULL. For a discussion of text and binary modes, see Text and Binary Mode File I/O. The fopen(), fdopen() and freopen() functions may also fail and set errno for any of the errors specified for the routine malloc(3). The fopen() function may also fail and set errno for any of the errors specified for the routine open(2). The fdopen() function may also fail and set errno for any of the errors specified for the routine fcntl(2). The fdopen() function shall associate a stream with a file descriptor. The mode argument is a character string having one of the following values: such as the 4.3 BSD socket() call. The meanings of the mode arguments of fdopen() and fopen() differ. With fdopen(), open for write (w or w+) does not truncate, and append (a or a+) cannot create 166 struct mnl_socket *mnl_socket_fdopen(int fd) 167 {168 int ret; 169 struct mnl_socket *nl; 170 struct sockaddr_nl addr; 171 socklen_t addr_len = sizeof (struct sockaddr_nl); 172 173 ret
Dec 15, 2008 · Third and the last one, in consequence of the above differences, I can't fdopen() a socket descriptor, at least in unix sometimes it is helpful to use buffered I/O functions specially when communicating in text mode with CRLF ending, fdopen() and fgets() disabling buffer to allow immediate reception of strings helped me to get line by line
fdopen is like an ordinary open except that its first parameter is not a filename but rather a file handle name, an IO::Handle object, or a file descriptor number. (For the documentation of the open method, see IO::File .) fdopen() on a socket. 3. fdopen'ed file ptr to a socket and select() 4. fdopen on socket. 5. Help on Design: Socket, fdopen, alarm() 6. Sockets and fdopen. 7. Using fdopen on a socket. 8. fdopen and sockets. 9. fdopen() on a socket. 10. fdopen and socket descriptors