lib/libdevinfo/devinfo_finddev.c

	devinfo_finddev.c revision facf4a8d7b59fde89a8662b4f4c73a758e6c402c
/*
 * 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 <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <thread.h>
#include <synch.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <dirent.h>
#include <regex.h>
#include <errno.h>
#include <stdarg.h>
#include <libdevinfo.h>
#include <sys/modctl.h>
#include <syslog.h>

#include <assert.h>


struct finddevhdl {
    int npaths;
    int curpath;
    char    **paths;
};


int
device_exists(const char *devname)
{
    int rv;

    rv = modctl(MODDEVEXISTS, devname, strlen(devname));
    return ((rv == 0) ? 1 : 0);
}

int
finddev_readdir(const char *dir, finddevhdl_t *handlep)
{
    struct finddevhdl   *handle;
    int         n;
    int         rv;
    int64_t         bufsiz;
    char            *pathlist;
    char            *p;
    int         len;

    *handlep = NULL;
    handle = calloc(1, sizeof (struct finddevhdl));
    if (handle == NULL)
        return (ENOMEM);

    handle->npaths = 0;
    handle->curpath = 0;
    handle->paths = NULL;

    rv = modctl(MODDEVREADDIR, dir, strlen(dir), NULL, &bufsiz);
    if (rv != 0) {
        free(handle);
        return (rv);
    }

    for (;;) {
        assert(bufsiz != 0);
        if ((pathlist = malloc(bufsiz)) == NULL) {
            free(handle);
            return (ENOMEM);
        }

        rv = modctl(MODDEVREADDIR, dir, strlen(dir),
            pathlist, &bufsiz);
        if (rv == 0) {
            for (n = 0, p = pathlist;
                (len = strlen(p)) > 0; p += len+1) {
                n++;
            }
            handle->npaths = n;
            handle->paths = calloc(n, sizeof (char *));
            if (handle->paths == NULL) {
                free(handle);
                free(pathlist);
                return (ENOMEM);
            }
            for (n = 0, p = pathlist;
                (len = strlen(p)) > 0; p += len+1, n++) {
                handle->paths[n] = strdup(p);
                if (handle->paths[n] == NULL) {
                    finddev_close((finddevhdl_t)handle);
                    free(pathlist);
                    return (ENOMEM);
                }
            }
            *handlep = (finddevhdl_t)handle;
            free(pathlist);
            return (0);
        }
        free(pathlist);
        switch (errno) {
        case EAGAIN:
            break;
        case ENOENT:
        default:
            free(handle);
            return (errno);
        }
    }
    /*NOTREACHED*/
}

void
finddev_close(finddevhdl_t arg)
{
    struct finddevhdl *handle = (struct finddevhdl *)arg;
    int i;

    for (i = 0; i < handle->npaths; i++) {
        if (handle->paths[i])
            free(handle->paths[i]);
    }
    free(handle->paths);
    free(handle);
}

const char *
finddev_next(finddevhdl_t arg)
{
    struct finddevhdl *handle = (struct finddevhdl *)arg;
    const char *path = NULL;

    if (handle->curpath < handle->npaths) {
        path = handle->paths[handle->curpath];
        handle->curpath++;
    }
    return (path);
}