/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 2002-2003, Network Appliance, Inc. All rights reserved.
 */

/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 *
 * MODULE: dat_osd.c
 *
 * PURPOSE: Operating System Dependent layer
 * Description:
 *      Provide OS dependent functions with a canonical DAPL
 *      interface. Designed to be portable and hide OS specific quirks
 *      of common functions.
 *
 * $Id: dat_osd.c,v 1.8 2003/08/15 20:09:52 jlentini Exp $
 */

#include "dat_osd.h"


/*
 *
 * Constants
 *
 */

#define DAT_DBG_TYPE_ENV        "DAT_DBG_TYPE"
#define DAT_DBG_DEST_ENV        "DAT_DBG_DEST"


/*
 *
 * Enumerations
 *
 */

typedef int                     DAT_OS_DBG_DEST;

typedef enum
{
    DAT_OS_DBG_DEST_STDOUT              = 0x1,
    DAT_OS_DBG_DEST_SYSLOG              = 0x2,
    DAT_OS_DBG_DEST_ALL                 = 0x3
} DAT_OS_DBG_DEST_TYPE;


/*
 *
 * Global Variables
 *
 */

static DAT_OS_DBG_TYPE_VAL      g_dbg_type = 0;
static DAT_OS_DBG_DEST          g_dbg_dest = DAT_OS_DBG_DEST_STDOUT;


/*
 * Function: dat_os_dbg_init
 */

void
dat_os_dbg_init(void)
{
        char *dbg_type;
        char *dbg_dest;

        if (NULL != (dbg_type = dat_os_getenv(DAT_DBG_TYPE_ENV))) {
                g_dbg_type = dat_os_strtol(dbg_type, NULL, 0);
        }

        if (NULL != (dbg_dest = dat_os_getenv(DAT_DBG_DEST_ENV))) {
                g_dbg_dest = dat_os_strtol(dbg_dest, NULL, 0);
        }
}


/*
 * Function: dat_os_dbg_print
 */

void
dat_os_dbg_print(
        DAT_OS_DBG_TYPE_VAL             type,
        const char                      *fmt,
        ...)
{
        if ((DAT_OS_DBG_TYPE_ERROR == type) || (type & g_dbg_type)) {
                va_list args;

                va_start(args, fmt);

                if (DAT_OS_DBG_DEST_STDOUT & g_dbg_dest) {
                        (void) vfprintf(stdout, fmt, args);
                        (void) fflush(stdout);
                }

                if (DAT_OS_DBG_DEST_SYSLOG & g_dbg_dest) {
                        vsyslog(LOG_USER | LOG_DEBUG, fmt, args);
                }

                va_end(args);
        }
}


/*
 * Function: dat_os_library_load
 */

DAT_RETURN
dat_os_library_load(
    const char                  *library_path,
    DAT_OS_LIBRARY_HANDLE       *library_handle_ptr)
{
        DAT_OS_LIBRARY_HANDLE   library_handle;

        if (NULL != (library_handle = dlopen(library_path, RTLD_NOW))) {
                if (NULL != library_handle_ptr) {
                        *library_handle_ptr = library_handle;
                }

                return (DAT_SUCCESS);
        } else {
                dat_os_dbg_print(DAT_OS_DBG_TYPE_ERROR,
                    "DAT: library load failure: %s\n",
                    dlerror());
                return (DAT_INTERNAL_ERROR);
        }
}


/*
 * Function: dat_os_library_unload
 */

DAT_RETURN
dat_os_library_unload(
        const DAT_OS_LIBRARY_HANDLE library_handle)
{
        if (0 != dlclose(library_handle)) {
                return (DAT_INTERNAL_ERROR);
        } else {
                return (DAT_SUCCESS);
        }
}