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[/] [openrisc/] [tags/] [or1ksim/] [or1ksim-0.4.0/] [peripheral/] [channels/] [tcp.c] - Rev 756
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/* tcp.c -- Definition of functions for peripheral to * communicate with host via a tcp socket. Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca> Copyright (C) 2008 Embecosm Limited Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* This program is commented throughout in a fashion suitable for processing with Doxygen. */ /* Autoconf and/or portability configuration */ #include "config.h" #include "port.h" /* System includes */ #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <fcntl.h> #include <errno.h> /* Package includes */ #include "channel.h" #include "generic.h" #include "fd.h" /*! Structure to represent a TCP/IP channel */ struct tcp_channel { struct fd_channel fds; int socket_fd; /* Socket to listen to */ int port_number; /* TCP port number */ int connected; /* If 0, no remote endpoint yet */ int nonblocking; /* If 0, read/write will block until remote client connects */ }; /* Forward declarations of static functions */ static void *tcp_init (const char *input); static int tcp_open (void *data); static int tcp_read (void *data, char *buffer, int size); static int tcp_write (void *data, const char *buffer, int size); /*! Data structure holding all the operations for a TCP/IP channel */ struct channel_ops tcp_channel_ops = { .init = tcp_init, .open = tcp_open, .close = generic_close, .read = tcp_read, .write = tcp_write, .free = generic_free, }; static void * tcp_init (const char *input) { int port_number, fd, flags; struct sockaddr_in local_ip; struct tcp_channel *channel = (struct tcp_channel *) malloc (sizeof (struct tcp_channel)); if (!channel) return NULL; fd = 0; channel->nonblocking = 1; channel->fds.fdin = -1; channel->fds.fdout = -1; channel->socket_fd = -1; channel->port_number = -1; port_number = atoi (input); if (port_number == 0) goto error; fd = socket (AF_INET, SOCK_STREAM, 0); if (fd < 0) goto error; flags = 1; if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, (const char *) &flags, sizeof (int)) < 0) { perror ("Can not set SO_REUSEADDR option on channel socket"); goto error; } memset (&local_ip, 0, sizeof (local_ip)); local_ip.sin_family = AF_INET; local_ip.sin_addr.s_addr = htonl (INADDR_ANY); local_ip.sin_port = htons (port_number); if (bind (fd, (struct sockaddr *) &local_ip, sizeof (local_ip)) < 0) { perror ("Can't bind local address"); goto error; } if (channel->nonblocking) { if (fcntl (fd, F_SETFL, O_NONBLOCK) < 0) { perror ("Can not make channel socket non-blocking"); goto error; } } if (listen (fd, 1) < 0) goto error; channel->socket_fd = fd; channel->port_number = port_number; channel->connected = 0; return (void *) channel; error: if (fd) close (fd); free (channel); return NULL; } static int tcp_open (void *data) { /* Socket is opened lazily, upon first read or write, so do nothing here */ return 0; } static int wait_for_tcp_connect (struct tcp_channel *channel) { int fd; socklen_t sizeof_remote_ip; struct sockaddr_in remote_ip; sizeof_remote_ip = sizeof (remote_ip); fd = accept (channel->socket_fd, (struct sockaddr *) &remote_ip, &sizeof_remote_ip); if (fd < 0) { if (channel->nonblocking) { /* Not an error if there is not yet a remote connection - try again later */ if (errno == EAGAIN) return 0; } perror ("Couldn't accept connection"); return -1; } channel->fds.fdin = channel->fds.fdout = fd; close (channel->socket_fd); channel->socket_fd = -1; channel->connected = 1; return 1; } static int tcp_read (void *data, char *buffer, int size) { struct tcp_channel *channel = data; /* Lazily connect to tcp partner on read/write */ if (!channel->connected) { int retval = wait_for_tcp_connect (data); if (retval <= 0) return retval; } return fd_read (data, buffer, size); } static int tcp_write (void *data, const char *buffer, int size) { struct tcp_channel *channel = data; /* Lazily connect to tcp partner on read/write */ if (!channel->connected) { int retval = wait_for_tcp_connect (data); if (retval < 0) return retval; } return fd_write (data, buffer, size); }
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