/* file.c -- Definition of functions and structures for
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/* file.c -- Definition of functions and structures for
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peripheral to communicate with host through files
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peripheral to communicate with host through files
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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) 1999 Damjan Lampret, lampret@opencores.org
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Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
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Copyright (C) 2008 Embecosm Limited
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Copyright (C) 2008 Embecosm Limited
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify it
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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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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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Software Foundation; either version 3 of the License, or (at your option)
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any later version.
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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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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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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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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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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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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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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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/* This program is commented throughout in a fashion suitable for processing
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with Doxygen. */
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with Doxygen. */
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/* Autoconf and/or portability configuration */
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/* Autoconf and/or portability configuration */
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#include "config.h"
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#include "config.h"
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#include "port.h"
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#include "port.h"
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/* System includes */
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/* System includes */
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#include <stdlib.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <errno.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fcntl.h>
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/* Package includes */
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/* Package includes */
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#include "channel.h"
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#include "channel.h"
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#include "fd.h"
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#include "fd.h"
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/*! Data structure representing a channel to/from a file */
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/*! Data structure representing a channel to/from a file */
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struct file_channel
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struct file_channel
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{
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{
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struct fd_channel fds;
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struct fd_channel fds;
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char *namein;
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char *namein;
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char *nameout;
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char *nameout;
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};
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};
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/* Forward declarations of static routines */
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/* Forward declarations of static routines */
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static void *file_init (const char *args);
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static void *file_init (const char *args);
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static int file_open (void *data);
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static int file_open (void *data);
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static void file_close (void *data);
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static void file_close (void *data);
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static void file_free (void *data);
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static void file_free (void *data);
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/*! Data structure with all the operations for communicating with a file
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/*! Data structure with all the operations for communicating with a file
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channel */
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channel */
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struct channel_ops file_channel_ops = {
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struct channel_ops file_channel_ops = {
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.init = file_init,
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.init = file_init,
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.open = file_open,
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.open = file_open,
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.close = file_close,
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.close = file_close,
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.read = fd_read,
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.read = fd_read,
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.write = fd_write,
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.write = fd_write,
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.free = file_free,
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.free = file_free,
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};
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};
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static void *
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static void *
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file_init (const char *args)
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file_init (const char *args)
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{
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{
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struct file_channel *retval;
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struct file_channel *retval;
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char *nameout;
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char *nameout;
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if (!args)
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if (!args)
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{
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{
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errno = EINVAL;
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errno = EINVAL;
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return NULL;
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return NULL;
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}
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}
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retval = (struct file_channel *) calloc (1, sizeof (struct file_channel));
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retval = (struct file_channel *) calloc (1, sizeof (struct file_channel));
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if (!retval)
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if (!retval)
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{
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{
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return NULL;
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return NULL;
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}
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}
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retval->fds.fdin = -1;
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retval->fds.fdin = -1;
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retval->fds.fdout = -1;
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retval->fds.fdout = -1;
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nameout = strchr (args, ',');
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nameout = strchr (args, ',');
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if (nameout)
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if (nameout)
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{
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{
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retval->namein = strndup (args, nameout - args);
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retval->namein = strndup (args, nameout - args);
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retval->nameout = strdup (nameout + 1);
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retval->nameout = strdup (nameout + 1);
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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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retval->nameout = retval->namein = strdup (args);
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retval->nameout = retval->namein = strdup (args);
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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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static int
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static int
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file_open (void *data)
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file_open (void *data)
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{
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{
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struct file_channel *files = (struct file_channel *) data;
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struct file_channel *files = (struct file_channel *) data;
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if (!files)
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if (!files)
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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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if (files->namein == files->nameout)
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if (files->namein == files->nameout)
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{
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{
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/* if we have the same name in and out
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/* if we have the same name in and out
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* it cannot (logically) be a regular files.
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* it cannot (logically) be a regular files.
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* so we wont create one
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* so we wont create one
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*/
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*/
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files->fds.fdin = files->fds.fdout = open (files->namein, O_RDWR);
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files->fds.fdin = files->fds.fdout = open (files->namein, O_RDWR);
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return files->fds.fdin < 0 ? -1 : 0;
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return files->fds.fdin < 0 ? -1 : 0;
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}
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}
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files->fds.fdin = open (files->namein, O_RDONLY | O_CREAT, 0664);
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files->fds.fdin = open (files->namein, O_RDONLY | O_CREAT, 0664);
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if (files->fds.fdin < 0)
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if (files->fds.fdin < 0)
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return -1;
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return -1;
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files->fds.fdout = open (files->nameout, O_WRONLY | O_CREAT, 0664);
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files->fds.fdout = open (files->nameout, O_WRONLY | O_CREAT, 0664);
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if (files->fds.fdout < 0)
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if (files->fds.fdout < 0)
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{
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{
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close (files->fds.fdout);
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close (files->fds.fdout);
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files->fds.fdout = -1;
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files->fds.fdout = -1;
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return -1;
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return -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 void
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static void
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file_close (void *data)
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file_close (void *data)
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{
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{
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struct file_channel *files = (struct file_channel *) data;
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struct file_channel *files = (struct file_channel *) data;
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if (files->fds.fdin != files->fds.fdout)
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if (files->fds.fdin != files->fds.fdout)
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close (files->fds.fdin);
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close (files->fds.fdin);
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close (files->fds.fdout);
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close (files->fds.fdout);
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files->fds.fdin = -1;
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files->fds.fdin = -1;
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files->fds.fdout = -1;
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files->fds.fdout = -1;
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}
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}
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static void
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static void
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file_free (void *data)
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file_free (void *data)
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{
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{
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struct file_channel *files = (struct file_channel *) data;
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struct file_channel *files = (struct file_channel *) data;
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if (files->namein != files->nameout)
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if (files->namein != files->nameout)
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free (files->namein);
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free (files->namein);
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free (files->nameout);
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free (files->nameout);
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free (files);
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free (files);
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}
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}
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