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/* fd.c -- Definition of functions and structures for
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/* fd.c -- Definition of functions and structures for
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peripheral to communicate with host through file descriptors
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peripheral to communicate with host through file descriptors
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Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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Copyright (C) 2008 Embecosm Limited
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This file is part of OpenRISC 1000 Architectural Simulator.
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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This program is free software; you can redistribute it and/or modify
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/time.h> /* struct timeval */
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#include <sys/types.h> /* fd_set */
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#include <stdio.h> /* perror */
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#include <stdlib.h> /* atoi */
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#include <unistd.h> /* read, write, select */
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#if HAVE_MALLOC_H
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#include <malloc.h> /* calloc, free */
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#endif
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#include <string.h> /* strchr */
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#include <errno.h> /* errno */
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This program is commented throughout in a fashion suitable for processing
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with Doxygen. */
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/* Autoconf and/or portability configuration */
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#include "config.h"
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#include "port.h"
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/* System includes */
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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/* Package includes */
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#include "fd.h"
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#include "channel.h"
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#include "channel.h"
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#include "generic.h"
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#include "generic.h"
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#include "fd.h"
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static void * fd_init(const char * args)
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/* Forward declarations of static functions */
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static void *fd_init (const char *args);
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static int fd_isok (void *data);
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static char *fd_status (void *data);
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/*! Global data structure representing the operations for communicating
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through a file descriptor channel */
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struct channel_ops fd_channel_ops = {
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.init = fd_init,
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.open = generic_open,
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.close = generic_close,
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.read = fd_read,
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.write = fd_write,
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.free = generic_free,
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.isok = fd_isok,
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.status = fd_status,
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};
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static void *
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fd_init (const char *args)
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{
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{
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struct fd_channel * retval;
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struct fd_channel * retval;
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retval = (struct fd_channel*)calloc(1, sizeof(struct fd_channel));
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retval = (struct fd_channel*)calloc(1, sizeof(struct fd_channel));
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}
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}
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return (void*)retval;
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return (void*)retval;
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}
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}
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int fd_read(void * data, char * buffer, int size)
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int
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fd_read (void *data, char *buffer, int size)
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{
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{
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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struct timeval timeout = { 0, 0 };
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struct timeval timeout = { 0, 0 };
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fd_set rfds;
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fd_set rfds;
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int retval;
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int retval;
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return retval;
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return retval;
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return read(fds->fdin, buffer, size);
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return read(fds->fdin, buffer, size);
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}
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}
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int fd_write(void * data, const char * buffer, int size)
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int
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fd_write (void *data, const char *buffer, int size)
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{
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{
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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if(fds)
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if(fds)
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{
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{
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return write(fds->fdout, buffer, size);
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return write(fds->fdout, buffer, size);
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}
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}
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errno = ENODEV;
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errno = ENODEV;
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return -1;
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return -1;
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}
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}
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static int fd_isok(void * data)
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static int
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fd_isok (void *data)
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{
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{
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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if(fds)
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if(fds)
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{
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{
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return fds->fdout != -1 && fds->fdin != -1;
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return fds->fdout != -1 && fds->fdin != -1;
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}
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}
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return 0;
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return 0;
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}
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}
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static int fd_status_fd(int fd, char * str, int size)
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static int
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fd_status_fd (int fd, char *str, int size)
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{
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{
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if(fd == -1)
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if(fd == -1)
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return snprintf(str, size, "closed");
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return snprintf(str, size, "closed");
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return snprintf(str, size, "opened(fd=%d)", fd);
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return snprintf(str, size, "opened(fd=%d)", fd);
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}
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}
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char * fd_status(void * data)
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static char *
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fd_status (void *data)
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{
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{
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static char retval[256];
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static char retval[256];
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int index = 0;
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int index = 0;
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struct fd_channel * fds = (struct fd_channel *)data;
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struct fd_channel * fds = (struct fd_channel *)data;
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if(fds)
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if(fds)
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{
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{
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index += snprintf(retval + index, sizeof(retval) - index, "in ");
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index += snprintf(retval + index, sizeof(retval) - index, "in ");
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index += fd_status_fd(fds->fdin, retval + index, sizeof(retval) - index);
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index +=
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fd_status_fd (fds->fdin, retval + index, sizeof (retval) - index);
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index += snprintf(retval + index, sizeof(retval) - index, "out ");
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index += snprintf(retval + index, sizeof(retval) - index, "out ");
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index += fd_status_fd(fds->fdout, retval + index, sizeof(retval) - index);
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index +=
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fd_status_fd (fds->fdout, retval + index, sizeof (retval) - index);
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}
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}
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else
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else
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{
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{
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snprintf(retval, sizeof(retval), "(null)");
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snprintf(retval, sizeof(retval), "(null)");
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}
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}
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return retval;
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return retval;
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}
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}
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struct channel_ops fd_channel_ops =
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{
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init: fd_init,
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open: generic_open,
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close: generic_close,
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read: fd_read,
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write: fd_write,
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free: generic_free,
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isok: fd_isok,
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status: fd_status,
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};
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/*
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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No newline at end of file
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No newline at end of file
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