Socket flow of events: Server that uses poll(). The following calls are used in the example: The socket() API returns a socket descriptor, which represents an endpoint. The statement also identifies that the AF_INET6 (Internet Protocol version 6) address family with the TCP transport (SOCK_STREAM) is used for this socket.
Socket flow of events: Server that uses poll(). The following calls are used in the example: The socket() API returns a socket descriptor, which represents an endpoint. The statement also identifies that the AF_INET6 (Internet Protocol version 6) address family with the TCP transport (SOCK_STREAM) is used for this socket. fd is connected to a pipe or socket whose reading end is closed. When this happens the writing process will also receive a SIGPIPE signal. (Thus, the write return value is seen only if the program catches, blocks or ignores this signal.) Other errors may occur, depending on the object connected to fd. Conforming to SVr4, 4.3BSD, POSIX.1-2001. Generally portable to/from non-BSD systems supporting clones of the BSD socket layer (including System V variants). However, note that the System V variant typically sets the timeout variable before exit, but the BSD variant does not. pselect() is defined in POSIX.1g, and in POSIX.1-2001. Notes. An fd_set is a fixed size buffer. The set of file descriptors to be monitored is specified in the fds argument, which is an array of structures of the following form: struct pollfd { int fd; /* file descriptor */ short events; /* requested events */ short revents; /* returned events */ }; The caller should specify the number of items in the fds array in nfds. Some web servers have passed accepted socket fd through sockets or pipes to pre-spawned helper processes on the same host. There is a procedure for turning the fd into a portable reference upstream and then back to a new fd on the downstream end. Socket option for putting received out-of-band data inline. protocol_type. The protocol type. receive_buffer_size. Socket option for the receive buffer size of a socket. receive_low_watermark. Socket option for the receive low watermark. reuse_address. Socket option to allow the socket to be bound to an address that is already in use. Nov 19, 2003 · int socket_select (int maxFDsExamined, fd_set *readFDs, fd_set *writeFDs, fd_set *exceptFDs, struct timeval *timeOut); socket_select() allows for conditions to be checked on one or more sockets. maxFDsExamined should be one greater than value of the largest valued socket descriptor in any of the lists.
c++ - Socket programming, what is FD and SD - Stack Overflow
File descriptor - Wikipedia 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 — Low-level networking interface — Python 3.8.4rc1 socket.fromfd (fd, family, type, proto=0) ¶ Duplicate the file descriptor fd (an integer as returned by a file object’s fileno() method) and build a socket object from the result. Address family, socket type and protocol number are as for the socket() function above. The file descriptor should refer to a socket, but this is not checked
c++ - Socket programming, what is FD and SD - Stack Overflow
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. The __WSAFDIsSet function specifies whether a socket is included in a set of socket descriptors. Syntax int __WSAFDIsSet( SOCKET , fd_set * ); Parameters. arg1. TBD. arg2. Pointer to an fd_set structure containing the set of socket descriptors. The __WSAFDIsSet function determines whether the socket specified in the fd parameter is a member of FD_CLOSE should only be posted after all data is read from a socket, but an application should check for remaining data upon receipt of FD_CLOSE to avoid any possibility of losing data. Be aware that the application will only receive an FD_CLOSE message to indicate closure of a virtual circuit, and only when all the received data has been read socket.fromfd (fd, family, type [, proto]) ¶ Duplicate the file descriptor fd (an integer as returned by a file object’s fileno() method) and build a socket object from the result. Address family, socket type and protocol number are as for the socket() function above. The file descriptor should refer to a socket, but this is not checked 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