/* channel.c -- Definition of types and structures for
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/* channel.c -- Definition of types and structures for
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peripherals to communicate with host. Adapted from UML.
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peripherals to communicate with host. Adapted from UML.
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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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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 <stdio.h>
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#include <stdio.h>
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#include <errno.h>
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#include <errno.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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#include "file.h"
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#include "file.h"
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#include "tcp.h"
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#include "tcp.h"
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#include "tty.h"
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#include "tty.h"
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#include "xterm.h"
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#include "xterm.h"
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struct channel_factory
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struct channel_factory
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{
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{
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const char *name;
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const char *name;
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const struct channel_ops *ops;
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const struct channel_ops *ops;
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struct channel_factory *next;
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struct channel_factory *next;
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};
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};
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static struct channel_factory preloaded[] = {
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static struct channel_factory preloaded[] = {
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{"fd", &fd_channel_ops, &preloaded[1]},
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{"fd", &fd_channel_ops, &preloaded[1]},
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{"file", &file_channel_ops, &preloaded[2]},
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{"file", &file_channel_ops, &preloaded[2]},
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{"xterm", &xterm_channel_ops, &preloaded[3]},
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{"xterm", &xterm_channel_ops, &preloaded[3]},
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{"tcp", &tcp_channel_ops, &preloaded[4]},
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{"tcp", &tcp_channel_ops, &preloaded[4]},
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{"tty", &tty_channel_ops, NULL}
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{"tty", &tty_channel_ops, NULL}
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};
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};
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static struct channel_factory *head = &preloaded[0];
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static struct channel_factory *head = &preloaded[0];
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/* Forward declaration of static functions */
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/* Forward declaration of static functions */
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static struct channel_factory *find_channel_factory (const char *name);
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static struct channel_factory *find_channel_factory (const char *name);
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struct channel *
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struct channel *
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channel_init (const char *descriptor)
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channel_init (const char *descriptor)
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{
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{
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struct channel *retval;
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struct channel *retval;
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struct channel_factory *current;
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struct channel_factory *current;
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char *args, *name;
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char *args, *name;
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int count;
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int count;
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if (!descriptor)
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if (!descriptor)
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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 = (struct channel *) calloc (1, sizeof (struct channel));
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retval = (struct channel *) calloc (1, sizeof (struct 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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perror (descriptor);
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perror (descriptor);
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exit (1);
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exit (1);
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}
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}
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args = strchr (descriptor, ':');
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args = strchr (descriptor, ':');
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if (args)
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if (args)
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{
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{
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count = args - descriptor;
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count = args - descriptor;
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args++;
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args++;
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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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count = strlen (descriptor);
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count = strlen (descriptor);
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}
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}
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name = (char *) strndup (descriptor, count);
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name = (char *) strndup (descriptor, count);
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if (!name)
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if (!name)
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{
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{
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perror (name);
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perror (name);
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exit (1);
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exit (1);
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}
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}
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current = find_channel_factory (name);
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current = find_channel_factory (name);
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if (!current)
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if (!current)
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{
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{
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errno = ENODEV;
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errno = ENODEV;
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perror (descriptor);
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perror (descriptor);
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exit (1);
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exit (1);
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}
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}
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retval->ops = current->ops;
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retval->ops = current->ops;
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free (name);
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free (name);
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if (!retval->ops)
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if (!retval->ops)
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{
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{
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errno = ENODEV;
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errno = ENODEV;
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perror (descriptor);
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perror (descriptor);
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exit (1);
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exit (1);
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}
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}
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if (retval->ops->init)
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if (retval->ops->init)
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{
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{
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retval->data = (retval->ops->init) (args);
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retval->data = (retval->ops->init) (args);
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if (!retval->data)
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if (!retval->data)
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{
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{
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perror (descriptor);
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perror (descriptor);
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exit (1);
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exit (1);
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}
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}
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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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int
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int
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channel_open (struct channel *channel)
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channel_open (struct channel *channel)
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{
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{
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if (channel && channel->ops && channel->ops->open)
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if (channel && channel->ops && channel->ops->open)
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{
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{
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return (channel->ops->open) (channel->data);
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return (channel->ops->open) (channel->data);
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}
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}
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errno = ENOSYS;
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errno = ENOSYS;
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return -1;
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return -1;
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}
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}
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int
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int
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channel_read (struct channel *channel, char *buffer, int size)
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channel_read (struct channel *channel, char *buffer, int size)
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{
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{
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if (channel && channel->ops && channel->ops->read)
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if (channel && channel->ops && channel->ops->read)
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{
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{
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return (channel->ops->read) (channel->data, buffer, size);
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return (channel->ops->read) (channel->data, buffer, size);
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}
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}
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errno = ENOSYS;
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errno = ENOSYS;
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return -1;
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return -1;
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}
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}
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int
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int
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channel_write (struct channel *channel, const char *buffer, int size)
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channel_write (struct channel *channel, const char *buffer, int size)
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{
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{
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if (channel && channel->ops && channel->ops->write)
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if (channel && channel->ops && channel->ops->write)
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{
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{
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return (channel->ops->write) (channel->data, buffer, size);
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return (channel->ops->write) (channel->data, buffer, size);
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}
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}
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errno = ENOSYS;
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errno = ENOSYS;
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return -1;
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return -1;
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}
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}
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void
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void
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channel_close (struct channel *channel)
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channel_close (struct channel *channel)
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{
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{
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if (channel && channel->ops && channel->ops->close)
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if (channel && channel->ops && channel->ops->close)
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{
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{
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(channel->ops->close) (channel->data);
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(channel->ops->close) (channel->data);
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}
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}
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}
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}
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static struct channel_factory *
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static struct channel_factory *
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find_channel_factory (const char *name)
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find_channel_factory (const char *name)
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{
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{
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struct channel_factory *current = head;
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struct channel_factory *current = head;
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current = head;
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current = head;
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while (current && strcmp (current->name, name))
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while (current && strcmp (current->name, name))
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{
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{
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current = current->next;
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current = current->next;
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}
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}
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return current;
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return current;
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}
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}
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