136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
/*
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* udev-remove.c
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*
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* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "udev.h"
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static int delete_node(struct udevice *udev)
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{
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char filename[PATH_SIZE];
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char partitionname[PATH_SIZE];
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struct name_entry *name_loop;
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struct stat stats;
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int retval;
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int i;
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int num;
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if (!list_empty(&udev->symlink_list)) {
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char symlinks[512] = "";
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list_for_each_entry(name_loop, &udev->symlink_list, node) {
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snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
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filename[sizeof(filename)-1] = '\0';
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if (stat(filename, &stats) != 0) {
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dbg("symlink '%s' not found", filename);
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continue;
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}
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if (udev->devt && stats.st_rdev != udev->devt) {
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info("symlink '%s' points to a different device, skip removal", filename);
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continue;
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}
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info("removing symlink '%s'", filename);
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unlink(filename);
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if (strchr(filename, '/'))
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delete_path(filename);
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strlcat(symlinks, filename, sizeof(symlinks));
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strlcat(symlinks, " ", sizeof(symlinks));
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}
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remove_trailing_chars(symlinks, ' ');
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if (symlinks[0] != '\0')
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setenv("DEVLINKS", symlinks, 1);
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}
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snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
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filename[sizeof(filename)-1] = '\0';
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if (stat(filename, &stats) != 0) {
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dbg("device node '%s' not found", filename);
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return -1;
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}
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if (udev->devt && stats.st_rdev != udev->devt) {
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info("device node '%s' points to a different device, skip removal", filename);
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return -1;
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}
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info("removing device node '%s'", filename);
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retval = unlink_secure(filename);
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if (retval)
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return retval;
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setenv("DEVNAME", filename, 1);
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num = udev->partitions;
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if (num > 0) {
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info("removing all_partitions '%s[1-%i]'", filename, num);
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if (num > 255) {
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info("garbage from udev database, skip all_partitions removal");
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return -1;
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}
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for (i = 1; i <= num; i++) {
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snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
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partitionname[sizeof(partitionname)-1] = '\0';
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unlink_secure(partitionname);
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}
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}
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if (strchr(udev->name, '/'))
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delete_path(filename);
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return retval;
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}
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/*
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* look up the sysfs path in the database to get the node name to remove
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* If we can't find it, use kernel name for lack of anything else to know to do
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*/
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int udev_remove_device(struct udevice *udev)
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{
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if (major(udev->devt) == 0)
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return 0;
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if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
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if (udev->ignore_remove) {
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dbg("remove event for '%s' requested to be ignored by rule", udev->name);
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return 0;
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}
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dbg("remove name='%s'", udev->name);
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udev_db_delete_device(udev);
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} else {
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dbg("'%s' not found in database, using kernel name '%s'", udev->dev->devpath, udev->dev->kernel_name);
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strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name));
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}
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return delete_node(udev);
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}
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