In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator used to access a file or other input/output resource, such as a pipe or network socket. File descriptors form part of the POSIX application programming interface.
Socket Programming in C/C++ - GeeksforGeeks int new_socket= accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen); It extracts the first connection request on the queue of pending connections for the listening socket, sockfd, creates a new connected socket, and returns a new file descriptor referring to that socket. GSocket: GIO Reference Manual - GNOME g_socket_get_fd () int g_socket_get_fd (GSocket *socket); Returns the underlying OS socket object. On unix this is a socket file descriptor, and on Windows this is a Winsock2 SOCKET handle. This may be useful for doing platform specific or otherwise unusual operations on the socket.
A socket is one end of an interprocess communication channel. The two processes each establish their own socket. The steps involved in establishing a socket on the client side are as follows: Create a socket with the socket() system call Connect the socket to the address of the server using the connect() system call Send and receive data.
FD_CLR(fd, &fdset) − Clears the bit for the file descriptor fd in the file descriptor set fdset. FD_ISSET(fd, &fdset) − Returns a non-zero value if the bit for the file descriptor fd is set in the file descriptor set pointed to by fdset, and 0 otherwise. FD_SET(fd, &fdset) − Sets the bit for the file descriptor fd in the file descriptor The newly created socket is not in the listening state. The original socket sd is unaffected by this call. The argument sd is a socket that has been created with sl_Socket(), bound to a local address with sl_Bind(), and is listening for connections after a sl_Listen(). The argument addr is a pointer to a sockaddr structure. This structure is
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We have created a fd_set variable readfds, which will monitor all the active file descriptors of the clients plus that of the main server listening socket. Whenever a new client will connect, master_socket will be activated and a new fd will be open for that client. socket(7) - Linux manual page