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/* Channel tee.
Copyright (C) 2007 Free Software Foundation, Inc.
Written by Carl Fredrik Hammar <hammy.lite@gmail.com>
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "channel.h"
static error_t
tee_read (struct channel *channel, size_t amount, void **buf, size_t *len)
{
return EOPNOTSUPP;
}
static error_t
tee_write (struct channel *channel, void *buf, size_t len, size_t *amount)
{
struct channel **ch, **channels = channel->class_hook;
error_t err;
size_t n, m;
if (! channels[0])
return 0;
err = channel_write (channels[0], buf, len, amount);
if (err)
return err;
for (ch = channels + 1; *ch; ch++)
for (n = 0; n < *amount; n += m)
{
err = channel_write (*ch, buf, len, &m);
if (err)
{
*amount = 0;
return err;
}
}
return 0;
}
static error_t
tee_flush (struct channel *channel)
{
struct channel **ch, **channels = channel->class_hook;
error_t err = 0;
for (ch = channels; *ch && !err; ch++)
channel_flush (*ch);
return err;
}
static error_t
tee_open (struct channel *channel, int flags)
{
error_t err = 0;
int i;
struct channel **channels = malloc (sizeof (struct channel *)
* (channel->hub->num_children + 1));
if (! channels)
return ENOMEM;
for (i = 0; i < channel->hub->num_children && !err; i++)
err = channel_open (channel->hub->children[i], flags, &channels[i]);
channels[channel->hub->num_children] = 0;
channel->class_hook = channels;
return err;
}
static void
tee_close (struct channel *channel)
{
free (channel->class_hook);
}
const struct channel_class
channel_tee_class = {
name: "tee",
read: tee_read,
write: tee_write,
flush: tee_flush,
open: tee_open,
close: tee_close,
create_hub: channel_create_tee_hub,
};
CHANNEL_STD_CLASS (tee);
error_t
channel_create_tee_hub (const char *name, int flags,
const struct channel_class *const *classes,
struct channel_hub **hub)
{
struct channel_hub *new;
error_t err;
flags |= CHANNEL_HARD_WRITEONLY | CHANNEL_ENFORCED;
err = channel_alloc_hub (&channel_tee_class, name, flags, &new);
if (err)
return err;
err = channel_create_hub_children (name, flags, classes,
&new->children, &new->num_children);
if (! err)
*hub = new;
return err;
}
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