libdat/common/dat_osd.c

/*
 * 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.
 */

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

/*
 *
 * 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);
    }
}