cmd/modload/rem_drv.c

	rem_drv.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <libintl.h>
#include <string.h>
#include <fcntl.h>
#include <sys/buf.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <limits.h>
#include <malloc.h>
#include <locale.h>
#include <ftw.h>
#include <sys/types.h>
#include <sys/mkdev.h>
#include "addrem.h"
#include "errmsg.h"

#define FT_DEPTH    15  /* device tree depth for nftw() */

static void usage(void);

int
main(int argc, char *argv[])
{
    int opt;
    char *basedir = NULL, *driver_name = NULL;
    int server = 0, mod_unloaded = 0;
    int modid, found;
    char maj_num[MAX_STR_MAJOR + 1];
    int err;

    (void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)   /* Should be defined by cc -D */
#define TEXT_DOMAIN "SYS_TEST"  /* Use this only if it weren't */
#endif
    (void) textdomain(TEXT_DOMAIN);

    /*  must be run by root */

    if (getuid() != 0) {
        (void) fprintf(stderr, gettext(ERR_NOT_ROOT));
        exit(1);
    }

    while ((opt = getopt(argc, argv, "b:")) != -1) {
        switch (opt) {
        case 'b' :
            server = 1;
            basedir = calloc(strlen(optarg) + 1, 1);
            if (basedir == NULL) {
                (void) fprintf(stderr, gettext(ERR_NO_MEM));
                exit(1);
            }
            (void) strcat(basedir, optarg);
            break;
        case '?' :
            usage();
            exit(1);
        }
    }

    if (argv[optind] != NULL) {
        driver_name = calloc(strlen(argv[optind]) + 1, 1);
        if (driver_name == NULL) {
            (void) fprintf(stderr, gettext(ERR_NO_MEM));
            exit(1);

        }
        (void) strcat(driver_name, argv[optind]);
        /*
         * check for extra args
         */
        if ((optind + 1) != argc) {
            usage();
            exit(1);
        }

    } else {
        usage();
        exit(1);
    }

    /* set up add_drv filenames */
    if ((build_filenames(basedir)) == ERROR) {
        exit(1);
    }

    /* must be only running version of add_drv/mod_drv/rem_drv */
    enter_lock();

    if ((check_perms_aliases(1, 1)) == ERROR)
        err_exit();

    if ((check_name_to_major(R_OK | W_OK)) == ERROR)
        err_exit();

    /* look up the major number of the driver being removed. */
    if ((found = get_major_no(driver_name, name_to_major)) == ERROR) {
        (void) fprintf(stderr, gettext(ERR_MAX_MAJOR), name_to_major);
        err_exit();
    }
    if (found == UNIQUE) {
        (void) fprintf(stderr, gettext(ERR_NOT_INSTALLED),
            driver_name);
        err_exit();
    }

    if (!server) {
        mod_unloaded = 1;

        /* get the module id for this driver */
        get_modid(driver_name, &modid);

        /* module is installed */
        if (modid != -1) {
            if (modctl(MODUNLOAD, modid) < 0) {
                perror(NULL);
                (void) fprintf(stderr, gettext(ERR_MODUN),
                    driver_name);
                mod_unloaded = 0;
            }
        }
        /* unload driver.conf file */
        if (modctl(MODUNLOADDRVCONF, (major_t)found) < 0) {
            perror(NULL);
            (void) fprintf(stderr,
                gettext("cannot unload %s.conf\n"), driver_name);
        }
    }

    if (mod_unloaded && (modctl(MODREMMAJBIND, (major_t)found) < 0)) {
        perror(NULL);
        (void) fprintf(stderr, gettext(ERR_MODREMMAJ), found);
    }
    /*
     * add driver to rem_name_to_major; if this fails, don`t
     * delete from name_to_major
     */
    (void) sprintf(maj_num, "%d", found);

    if (append_to_file(driver_name, maj_num,
        rem_name_to_major, ' ', " ") == ERROR) {
        (void) fprintf(stderr, gettext(ERR_NO_UPDATE),
            rem_name_to_major);
        err_exit();
    }

    /*
     * If removing the driver from the running system, notify
     * kernel dynamically to remove minor perm entries.
     */
    if (basedir == NULL || (strcmp(basedir, "/") == 0)) {
        err = devfs_rm_minor_perm(driver_name, log_minorperm_error);
        if (err != 0) {
            (void) fprintf(stderr, gettext(ERR_UPDATE_PERM),
                driver_name, err);
        }
    }

    /*
     * delete references to driver in add_drv/rem_drv database
     */
    remove_entry(CLEAN_ALL, driver_name);

    /*
     * Clean up any dangling devfs shadow nodes for this
     * driver so that, in the event the driver is re-added
     * to the system, newly created nodes won't incorrectly
     * pick up these stale shadow node permissions.
     */
    if (basedir == NULL || (strcmp(basedir, "/") == 0)) {
        err = modctl(MODREMDRVCLEANUP, driver_name, 0, NULL);
        if (err != 0) {
            (void) fprintf(stderr, gettext(ERR_REMDRV_CLEANUP),
                driver_name, err);
        }
    }

    exit_unlock();

    return (NOERR);
}

static void
usage()
{
    (void) fprintf(stderr, gettext(REM_USAGE1));
}