libproc/common/Putil.c

	Putil.c revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
 * 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 2005 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 <stdarg.h>
#include <stdio.h>
#include <errno.h>

#include "Pcontrol.h"
#include "Putil.h"

/*
 * Place the new element on the list prior to the existing element.
 */
void
list_link(void *new, void *existing)
{
    plist_t *p = new;
    plist_t *q = existing;

    if (q) {
        p->list_forw = q;
        p->list_back = q->list_back;
        q->list_back->list_forw = p;
        q->list_back = p;
    } else {
        p->list_forw = p->list_back = p;
    }
}

/*
 * Unchain the specified element from a list.
 */
void
list_unlink(void *old)
{
    plist_t *p = old;

    if (p->list_forw != p) {
        p->list_back->list_forw = p->list_forw;
        p->list_forw->list_back = p->list_back;
    }
    p->list_forw = p->list_back = p;
}

/*
 * Routines to manipulate sigset_t, fltset_t, or sysset_t.  These routines
 * are provided as equivalents for the <sys/procfs.h> macros prfillset,
 * premptyset, praddset, and prdelset.  These functions are preferable
 * because they are not macros which rely on using sizeof (*sp), and thus
 * can be used to create common code to manipulate event sets.  The set
 * size must be passed explicitly, e.g. : prset_fill(&set, sizeof (set));
 */
void
prset_fill(void *sp, size_t size)
{
    size_t i = size / sizeof (uint32_t);

    while (i != 0)
        ((uint32_t *)sp)[--i] = (uint32_t)0xFFFFFFFF;
}

void
prset_empty(void *sp, size_t size)
{
    size_t i = size / sizeof (uint32_t);

    while (i != 0)
        ((uint32_t *)sp)[--i] = (uint32_t)0;
}

void
prset_add(void *sp, size_t size, uint_t flag)
{
    if (flag - 1 < 32 * size / sizeof (uint32_t))
        ((uint32_t *)sp)[(flag - 1) / 32] |= 1U << ((flag - 1) % 32);
}

void
prset_del(void *sp, size_t size, uint_t flag)
{
    if (flag - 1 < 32 * size / sizeof (uint32_t))
        ((uint32_t *)sp)[(flag - 1) / 32] &= ~(1U << ((flag - 1) % 32));
}

int
prset_ismember(void *sp, size_t size, uint_t flag)
{
    return ((flag - 1 < 32 * size / sizeof (uint32_t)) &&
        (((uint32_t *)sp)[(flag - 1) / 32] & (1U << ((flag - 1) % 32))));
}

/*
 * If _libproc_debug is set, printf the debug message to stderr
 * with an appropriate prefix.
 */
/*PRINTFLIKE1*/
void
dprintf(const char *format, ...)
{
    if (_libproc_debug) {
        va_list alist;

        va_start(alist, format);
        (void) fputs("libproc DEBUG: ", stderr);
        (void) vfprintf(stderr, format, alist);
        va_end(alist);
    }
}

/*
 * Printf-style error reporting function.  This is used to supplement the error
 * return codes from various libproc functions with additional text.  Since we
 * are a library, and should not be spewing messages to stderr, we provide a
 * default version of this function that does nothing, but by calling this
 * function we allow the client program to define its own version of the
 * function that will interpose on our empty default.  This may be useful for
 * clients that wish to display such messages to the user.
 */
/*ARGSUSED*/
/*PRINTFLIKE2*/
void
Perror_printf(struct ps_prochandle *P, const char *format, ...)
{
    /* nothing to do here */
}