libtopo/common/topo_file.c

	topo_file.c revision 0eb822a1c0c2bea495647510b75f77f0e57633eb
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <limits.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <topo_error.h>
#include <topo_tree.h>
#include <topo_subr.h>
#include <topo_file.h>

/*
 * topo_file.c
 *
 *  This file hides the details of any file manipulation to
 *  establish topology for a given enumerator.
 */

#define TOPO_DEFAULT_FILE   "maps/%s-%s-topology.xml"
#define TOPO_COMMON_FILE    "maps/%s-topology.xml"

static void
topo_file_unload(topo_file_t *tfp)
{

    if (tfp == NULL)
        return;

    if (tfp->tf_filenm != NULL)
        topo_mod_strfree(tfp->tf_mod, tfp->tf_filenm);

    if (tfp->tf_tmap != NULL)
        tf_info_free(tfp->tf_mod, tfp->tf_tmap);

    topo_mod_free(tfp->tf_mod, tfp, sizeof (topo_file_t));
}

int
topo_file_load(topo_mod_t *mod, tnode_t *node, const char *name,
    const char *scheme)
{
    topo_file_t *tfp;
    char fp[MAXNAMELEN];

    if ((tfp = topo_mod_zalloc(mod, sizeof (topo_file_t))) == NULL)
        return (topo_mod_seterrno(mod, ETOPO_NOMEM));

    tfp->tf_mod = mod;

    if (name != NULL)
        (void) snprintf(fp, MAXNAMELEN, TOPO_DEFAULT_FILE, name,
            scheme);
    else
        (void) snprintf(fp, MAXNAMELEN, TOPO_COMMON_FILE, scheme);

    if ((tfp->tf_filenm = topo_search_path(mod, mod->tm_rootdir, fp))
        == NULL) {
        topo_file_unload(tfp);
        return (topo_mod_seterrno(mod, ETOPO_MOD_NOENT));
    }

    if ((tfp->tf_tmap = topo_xml_read(mod, tfp->tf_filenm, scheme))
        == NULL) {
        topo_dprintf(mod->tm_hdl, TOPO_DBG_ERR,
            "failed to load topology file %s: "
            "%s\n", tfp->tf_filenm, topo_strerror(ETOPO_MOD_XRD));
        topo_file_unload(tfp);
        return (topo_mod_seterrno(mod, ETOPO_MOD_XRD));
    }

    if (topo_xml_enum(mod, tfp->tf_tmap, node) < 0) {
        topo_dprintf(mod->tm_hdl, TOPO_DBG_ERR,
            "Failed to enumerate topology: %s\n",
            topo_strerror(ETOPO_MOD_XENUM));
        topo_file_unload(tfp);
        return (topo_mod_seterrno(mod, ETOPO_MOD_XENUM));
    }

    topo_file_unload(tfp);

    return (0);
}