libtopo/common/topo_subr.c

	topo_subr.c revision 7aec1d6e253b21f9e9b7ef68b4d81ab9859b51fe
/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <alloca.h>
#include <syslog.h>
#include <strings.h>

#include <topo_error.h>
#include <topo_subr.h>

struct _rwlock;
struct _lwp_mutex;

int _topo_debug = 0;    /* debug messages enabled (off) */
int _topo_dbout = 0;    /* debug messages output mode */

int
topo_rw_read_held(pthread_rwlock_t *lock)
{
    extern int _rw_read_held(struct _rwlock *);
    return (_rw_read_held((struct _rwlock *)lock));
}

int
topo_rw_write_held(pthread_rwlock_t *lock)
{
    extern int _rw_write_held(struct _rwlock *);
    return (_rw_write_held((struct _rwlock *)lock));
}

int
topo_mutex_held(pthread_mutex_t *lock)
{
    extern int _mutex_held(struct _lwp_mutex *);
    return (_mutex_held((struct _lwp_mutex *)lock));
}

void
topo_hdl_lock(topo_hdl_t *thp)
{
    (void) pthread_mutex_lock(&thp->th_lock);
}

void
topo_hdl_unlock(topo_hdl_t *thp)
{
    (void) pthread_mutex_unlock(&thp->th_lock);
}

const char *
topo_stability_name(topo_stability_t s)
{
    switch (s) {
    case TOPO_STABILITY_INTERNAL:   return ("Internal");
    case TOPO_STABILITY_PRIVATE:    return ("Private");
    case TOPO_STABILITY_OBSOLETE:   return ("Obsolete");
    case TOPO_STABILITY_EXTERNAL:   return ("External");
    case TOPO_STABILITY_UNSTABLE:   return ("Unstable");
    case TOPO_STABILITY_EVOLVING:   return ("Evolving");
    case TOPO_STABILITY_STABLE: return ("Stable");
    case TOPO_STABILITY_STANDARD:   return ("Standard");
    default:            return (NULL);
    }
}

static const topo_debug_mode_t _topo_dbout_modes[] = {
    { "stderr", "send debug messages to stderr", TOPO_DBOUT_STDERR },
    { "syslog", "send debug messages to syslog", TOPO_DBOUT_SYSLOG },
    { NULL, NULL, 0 }
};

void
topo_debug_set(topo_hdl_t *thp, int mask, char *dout)
{
    int i;

    for (i = 0; i < 2; ++i) {
        if (strcmp(_topo_dbout_modes[i].tdm_name, dout) == 0) {
            thp->th_dbout = _topo_dbout =
                _topo_dbout_modes[i].tdm_mode;
            thp->th_debug = _topo_debug = mask;
            topo_dprintf(mask, _topo_dbout_modes[i].tdm_desc);
        }
    }
}

void
topo_vdprintf(int mask, const char *format, va_list ap)
{
    char *msg;
    size_t len;
    char c;

    if (!(_topo_debug & mask))
        return;

    len = vsnprintf(&c, 1, format, ap);
    msg = alloca(len + 2);
    (void) vsnprintf(msg, len + 1, format, ap);

    if (msg[len - 1] != '\n')
        (void) strcpy(&msg[len], "\n");

    if (_topo_dbout == TOPO_DBOUT_STDERR)
        (void) fprintf(stderr, "libtopo DEBUG: %s", msg);

    if (_topo_dbout == TOPO_DBOUT_SYSLOG)
        syslog(LOG_DEBUG | LOG_USER, "libtopo DEBUG: %s", msg);
}

/*PRINTFLIKE2*/
void
topo_dprintf(int mask, const char *format, ...)
{
    va_list ap;

    if (!(_topo_debug & mask))
        return;

    va_start(ap, format);
    topo_vdprintf(mask, format, ap);
    va_end(ap);
}

tnode_t *
topo_hdl_root(topo_hdl_t *thp, const char *scheme)
{
    ttree_t *tp;

    for (tp = topo_list_next(&thp->th_trees); tp != NULL;
        tp = topo_list_next(tp)) {
        if (strcmp(scheme, tp->tt_scheme) == 0)
            return (tp->tt_root);
    }

    return (NULL);
}