/* 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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This file is part of OpenRISC 1000 Architectural Simulator.
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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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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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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(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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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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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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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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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if HAVE_CONFIG_H
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#if HAVE_CONFIG_H
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#include <config.h>
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#include <config.h>
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#endif
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#endif
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#define _GNU_SOURCE /* for strndup */
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#define _GNU_SOURCE /* for strndup */
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#include <sys/types.h> /* open() */
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#include <sys/types.h> /* open() */
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#include <sys/stat.h> /* open() */
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#include <sys/stat.h> /* open() */
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#include <fcntl.h> /* open() */
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#include <fcntl.h> /* open() */
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#if HAVE_MALLOC_H
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#if HAVE_MALLOC_H
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#include <malloc.h> /* calloc, free */
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#include <malloc.h> /* calloc, free */
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#endif
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#endif
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#include <string.h> /* strndup(), strchr() */
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#include <string.h> /* strndup(), strchr() */
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#include <errno.h> /* errno */
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#include <errno.h> /* errno */
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#include <unistd.h> /* close() */
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#include <unistd.h> /* close() */
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#include "channel.h" /* struct channel_ops */
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#include "channel.h" /* struct channel_ops */
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#include "fd.h" /* struct fd_channel, fd_read(), fd_write() */
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#include "fd.h" /* struct fd_channel, fd_read(), fd_write() */
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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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static void * file_init(const char * args)
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static void * 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 file_open(void * data)
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static int 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 file_close(void * data)
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static void 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 file_free(void * data)
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static void 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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struct channel_ops file_channel_ops =
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struct channel_ops file_channel_ops =
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{
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{
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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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/*
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/*
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* Local variables:
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* Local variables:
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* c-file-style: "linux"
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* c-file-style: "linux"
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* End:
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* End:
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*/
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*/
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