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Diffstat (limited to 'nuttx/net/listen.c')
-rw-r--r-- | nuttx/net/listen.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/nuttx/net/listen.c b/nuttx/net/listen.c new file mode 100644 index 000000000..bddb0ab08 --- /dev/null +++ b/nuttx/net/listen.c @@ -0,0 +1,149 @@ +/**************************************************************************** + * net/listen.c + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 + +#include <sys/socket.h> +#include <errno.h> +#include <debug.h> + +#include "net_internal.h" + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: listen + * + * Description: + * To accept connections, a socket is first created with socket(), a + * willingness to accept incoming connections and a queue limit for incoming + * connections are specified with listen(), and then the connections are + * accepted with accept(). The listen() call applies only to sockets of + * type SOCK_STREAM or SOCK_SEQPACKET. + * + * Parameters: + * sockfd Socket descriptor of the bound socket + * backlog The maximum length the queue of pending connections may grow. + * If a connection request arrives with the queue full, the client + * may receive an error with an indication of ECONNREFUSED or, + * if the underlying protocol supports retransmission, the request + * may be ignored so that retries succeed. + * + * Returned Value: + * On success, zero is returned. On error, -1 is returned, and errno is set + * appropriately. + * + * EADDRINUSE + * Another socket is already listening on the same port. + * EBADF + * The argument 'sockfd' is not a valid descriptor. + * ENOTSOCK + * The argument 'sockfd' is not a socket. + * EOPNOTSUPP + * The socket is not of a type that supports the listen operation. + * + * Assumptions: + * + ****************************************************************************/ + +int listen(int sockfd, int backlog) +{ + FAR struct socket *psock = sockfd_socket(sockfd); + struct uip_conn *conn; + int err; + + /* Verify that the sockfd corresponds to valid, allocated socket */ + + if (!psock || psock->s_crefs <= 0) + { + /* It is not a valid socket description. Distinguish between the cases + * where sockfd is a just invalid and when it is a valid file descriptor used + * in the wrong context. + */ + +#if CONFIG_NFILE_DESCRIPTORS > 0 + if ((unsigned int)sockfd < CONFIG_NFILE_DESCRIPTORS) + { + err = ENOTSOCK; + } + else +#endif + { + err = EBADF; + } + goto errout; + } + + /* Verify that the sockfd corresponds to a connected SOCK_STREAM */ + + conn = (struct uip_conn *)psock->s_conn; + if (psock->s_type != SOCK_STREAM || !psock->s_conn || conn->lport <= 0) + { + err = EOPNOTSUPP; + goto errout; + } + + /* Set up the backlog for this connection */ + +#ifdef CONFIG_NET_TCPBACKLOG + err = uip_backlogcreate(conn, backlog); + if (err < 0) + { + err = -err; + goto errout; + } +#endif + + /* Start listening to the bound port. This enables callbacks when accept() + * is called and enables poll()/select() logic. + */ + + uip_listen(conn); + psock->s_flags |= _SF_LISTENING; + return OK; + +errout: + errno = err; + return ERROR; +} + +#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */ |