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[/] [or1k/] [tags/] [nog_patch_47/] [or1ksim/] [peripheral/] [channels/] [tcp.c] - Rev 1419
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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> This file is part of 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <fcntl.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "channel.h" #include "generic.h" #include "fd.h" 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 */ }; 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, 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); } struct channel_ops tcp_channel_ops = { init: tcp_init, open: tcp_open, close: generic_close, read: tcp_read, write: tcp_write, free: generic_free, }; /* * Local variables: * c-file-style: "linux" * End: */
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