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/* Hurd /proc filesystem, concatenation of two directories.
Copyright (C) 2010 Free Software Foundation, Inc.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdlib.h>
#include <string.h>
#include "procfs.h"
struct dircat_node
{
int num_dirs;
struct node *dirs[0];
};
static error_t
dircat_get_contents (void *hook, char **contents, ssize_t *contents_len)
{
struct dircat_node *dcn = hook;
int i, sz, pos;
error_t err;
pos = 0;
*contents = malloc (sz = 512);
for (i=0; i < dcn->num_dirs; i++)
{
char *subcon;
ssize_t sublen;
/* Make sure we're not getting some old stuff. */
procfs_refresh (dcn->dirs[i]);
err = procfs_get_contents (dcn->dirs[i], &subcon, &sublen);
if (err)
{
free (*contents);
*contents = NULL;
return err;
}
while (pos + sublen > sz)
*contents = realloc (*contents, sz *= 2);
memcpy (*contents + pos, subcon, sublen);
pos += sublen;
}
*contents_len = pos;
return 0;
}
static error_t
dircat_lookup (void *hook, const char *name, struct node **np)
{
struct dircat_node *dcn = hook;
error_t err;
int i;
err = ENOENT;
for (i=0; err && i < dcn->num_dirs; i++)
err = procfs_lookup (dcn->dirs[i], name, np);
return err;
}
static void
dircat_release_dirs (struct node *const *dirs, int num_dirs)
{
int i;
for (i=0; i < num_dirs; i++)
if (dirs[i])
netfs_nrele (dirs[i]);
}
static void
dircat_cleanup (void *hook)
{
struct dircat_node *dcn = hook;
dircat_release_dirs (dcn->dirs, dcn->num_dirs);
free (dcn);
}
struct node *
dircat_make_node (struct node *const *dirs, int num_dirs)
{
static struct procfs_node_ops ops = {
.get_contents = dircat_get_contents,
.cleanup_contents = procfs_cleanup_contents_with_free,
.lookup = dircat_lookup,
.cleanup = dircat_cleanup,
};
struct dircat_node *dcn;
int i;
for (i=0; i < num_dirs; i++)
if (! dirs[i])
goto fail;
dcn = malloc (sizeof *dcn + num_dirs * sizeof dcn->dirs[0]);
if (! dcn)
goto fail;
dcn->num_dirs = num_dirs;
memcpy (dcn->dirs, dirs, num_dirs * sizeof dcn->dirs[0]);
return procfs_make_node (&ops, dcn);
fail:
dircat_release_dirs (dirs, num_dirs);
return NULL;
}
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