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c07669bd66
Handle all events with rules. If udev is expected to handle hotplug.d/ the exernal helper must be called. Signed-off-by: Kay Sievers <kay.sievers@suse.de>
490 lines
11 KiB
C
490 lines
11 KiB
C
/*
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* udev_rules_parse.c
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*
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* Userspace devfs
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*
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* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2003-2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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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 <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "udev_utils.h"
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#include "logging.h"
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#include "udev_rules.h"
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LIST_HEAD(udev_rule_list);
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static int add_config_dev(struct udev_rule *rule)
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{
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struct udev_rule *tmp_rule;
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tmp_rule = malloc(sizeof(*tmp_rule));
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if (tmp_rule == NULL)
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return -ENOMEM;
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memcpy(tmp_rule, rule, sizeof(struct udev_rule));
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list_add_tail(&tmp_rule->node, &udev_rule_list);
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dbg("name='%s', symlink='%s', bus='%s', id='%s', "
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"sysfs_file[0]='%s', sysfs_value[0]='%s', "
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"kernel='%s', program='%s', result='%s', "
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"owner='%s', group='%s', mode=%#o, "
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"all_partions=%u, ignore_remove=%u, ignore_device=%u, last_rule=%u",
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rule->name, rule->symlink, rule->bus, rule->id,
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rule->sysfs_pair[0].name, rule->sysfs_pair[0].value,
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rule->kernel, rule->program, rule->result, rule->owner, rule->group, rule->mode,
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rule->partitions, rule->ignore_remove, rule->ignore_device, rule->last_rule);
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return 0;
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}
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static int get_key(char **line, char **key, enum key_operation *operation, char **value)
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{
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char *linepos;
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char *temp;
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linepos = *line;
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if (!linepos)
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return -1;
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/* skip whitespace */
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while (isspace(linepos[0]) || linepos[0] == ',')
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linepos++;
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/* get the key */
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*key = linepos;
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while (1) {
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linepos++;
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if (linepos[0] == '\0')
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return -1;
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if (isspace(linepos[0]))
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break;
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if (linepos[0] == '=')
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break;
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if (linepos[0] == '+')
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break;
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if (linepos[0] == '!')
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break;
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if (linepos[0] == ':')
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break;
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}
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/* remember end of key */
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temp = linepos;
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/* skip whitespace after key */
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while (isspace(linepos[0]))
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linepos++;
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/* get operation type */
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if (linepos[0] == '=' && linepos[1] == '=') {
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*operation = KEY_OP_MATCH;
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linepos += 2;
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dbg("operator=match");
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} else if (linepos[0] == '!' && linepos[1] == '=') {
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*operation = KEY_OP_NOMATCH;
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linepos += 2;
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dbg("operator=nomatch");
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} else if (linepos[0] == '+' && linepos[1] == '=') {
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*operation = KEY_OP_ADD;
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linepos += 2;
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dbg("operator=add");
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} else if (linepos[0] == '=') {
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*operation = KEY_OP_ASSIGN;
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linepos++;
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dbg("operator=assign");
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} else if (linepos[0] == ':' && linepos[1] == '=') {
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*operation = KEY_OP_ASSIGN_FINAL;
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linepos += 2;
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dbg("operator=assign_final");
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} else
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return -1;
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/* terminate key */
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temp[0] = '\0';
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dbg("key='%s'", *key);
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/* skip whitespace after operator */
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while (isspace(linepos[0]))
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linepos++;
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/* get the value*/
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if (linepos[0] == '"')
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linepos++;
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else
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return -1;
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*value = linepos;
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temp = strchr(linepos, '"');
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if (!temp)
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return -1;
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temp[0] = '\0';
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temp++;
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dbg("value='%s'", *value);
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/* move line to next key */
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*line = temp;
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return 0;
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}
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/* extract possible KEY{attr} */
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static char *get_key_attribute(char *str)
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{
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char *pos;
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char *attr;
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attr = strchr(str, '{');
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if (attr != NULL) {
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attr++;
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pos = strchr(attr, '}');
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if (pos == NULL) {
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err("missing closing brace for format");
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return NULL;
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}
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pos[0] = '\0';
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dbg("attribute='%s'", attr);
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return attr;
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}
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return NULL;
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}
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static int rules_parse(const char *filename)
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{
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char line[LINE_SIZE];
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char *bufline;
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int lineno;
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char *linepos;
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char *attr;
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char *buf;
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size_t bufsize;
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size_t cur;
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size_t count;
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int program_given = 0;
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int valid;
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int retval = 0;
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struct udev_rule rule;
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if (file_map(filename, &buf, &bufsize) != 0) {
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err("can't open '%s' as rules file", filename);
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return -1;
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}
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dbg("reading '%s' as rules file", filename);
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/* loop through the whole file */
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cur = 0;
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lineno = 0;
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while (cur < bufsize) {
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unsigned int i, j;
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count = buf_get_line(buf, bufsize, cur);
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bufline = &buf[cur];
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cur += count+1;
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lineno++;
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if (count >= sizeof(line)) {
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info("line too long, rule skipped %s, line %d", filename, lineno);
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continue;
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}
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/* eat the whitespace */
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while ((count > 0) && isspace(bufline[0])) {
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bufline++;
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count--;
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}
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if (count == 0)
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continue;
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/* see if this is a comment */
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if (bufline[0] == COMMENT_CHARACTER)
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continue;
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/* skip backslash and newline from multi line rules */
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for (i = j = 0; i < count; i++) {
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if (bufline[i] == '\\' && bufline[i+1] == '\n')
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continue;
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line[j++] = bufline[i];
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}
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line[j] = '\0';
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dbg("read '%s'", line);
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/* get all known keys */
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memset(&rule, 0x00, sizeof(struct udev_rule));
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linepos = line;
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valid = 0;
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while (1) {
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char *key;
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char *value;
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enum key_operation operation = KEY_OP_UNSET;
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retval = get_key(&linepos, &key, &operation, &value);
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if (retval)
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break;
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if (strcasecmp(key, KEY_KERNEL) == 0) {
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strlcpy(rule.kernel, value, sizeof(rule.kernel));
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rule.kernel_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_SUBSYSTEM) == 0) {
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strlcpy(rule.subsystem, value, sizeof(rule.subsystem));
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rule.subsystem_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_ACTION) == 0) {
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strlcpy(rule.action, value, sizeof(rule.action));
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rule.action_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_BUS) == 0) {
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strlcpy(rule.bus, value, sizeof(rule.bus));
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rule.bus_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_ID) == 0) {
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strlcpy(rule.id, value, sizeof(rule.id));
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rule.id_operation = operation;
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valid = 1;
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continue;
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}
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if (strncasecmp(key, KEY_SYSFS, sizeof(KEY_SYSFS)-1) == 0) {
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struct key_pair *pair;
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if (rule.sysfs_pair_count >= KEY_SYSFS_PAIRS_MAX) {
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err("skip rule, to many " KEY_SYSFS " keys in a single rule");
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goto error;
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}
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pair = &rule.sysfs_pair[rule.sysfs_pair_count];
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attr = get_key_attribute(key + sizeof(KEY_SYSFS)-1);
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if (attr == NULL) {
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err("error parsing " KEY_SYSFS " attribute");
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goto error;
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}
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strlcpy(pair->name, attr, sizeof(pair->name));
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strlcpy(pair->value, value, sizeof(pair->value));
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pair->operation = operation;
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rule.sysfs_pair_count++;
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valid = 1;
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continue;
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}
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if (strncasecmp(key, KEY_ENV, sizeof(KEY_ENV)-1) == 0) {
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struct key_pair *pair;
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if (rule.env_pair_count >= KEY_ENV_PAIRS_MAX) {
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err("skip rule, to many " KEY_ENV " keys in a single rule");
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goto error;
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}
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pair = &rule.env_pair[rule.env_pair_count];
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attr = get_key_attribute(key + sizeof(KEY_ENV)-1);
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if (attr == NULL) {
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err("error parsing " KEY_ENV " attribute");
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continue;
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}
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strlcpy(pair->name, attr, sizeof(pair->name));
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strlcpy(pair->value, value, sizeof(pair->value));
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pair->operation = operation;
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rule.env_pair_count++;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_DRIVER) == 0) {
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strlcpy(rule.driver, value, sizeof(rule.driver));
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rule.driver_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_RESULT) == 0) {
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strlcpy(rule.result, value, sizeof(rule.result));
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rule.result_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_PROGRAM) == 0) {
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strlcpy(rule.program, value, sizeof(rule.program));
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rule.program_operation = operation;
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program_given = 1;
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valid = 1;
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continue;
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}
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if (strncasecmp(key, KEY_NAME, sizeof(KEY_NAME)-1) == 0) {
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attr = get_key_attribute(key + sizeof(KEY_NAME)-1);
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if (attr != NULL) {
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if (strstr(attr, OPTION_PARTITIONS) != NULL) {
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dbg("creation of partition nodes requested");
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rule.partitions = DEFAULT_PARTITIONS_COUNT;
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}
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/* FIXME: remove old style option and make OPTIONS= mandatory */
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if (strstr(attr, OPTION_IGNORE_REMOVE) != NULL) {
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dbg("remove event should be ignored");
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rule.ignore_remove = 1;
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}
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}
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rule.name_operation = operation;
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strlcpy(rule.name, value, sizeof(rule.name));
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_SYMLINK) == 0) {
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strlcpy(rule.symlink, value, sizeof(rule.symlink));
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rule.symlink_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_OWNER) == 0) {
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strlcpy(rule.owner, value, sizeof(rule.owner));
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rule.owner_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_GROUP) == 0) {
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strlcpy(rule.group, value, sizeof(rule.group));
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rule.group_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_MODE) == 0) {
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rule.mode = strtol(value, NULL, 8);
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rule.mode_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_RUN) == 0) {
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strlcpy(rule.run, value, sizeof(rule.run));
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rule.run_operation = operation;
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valid = 1;
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continue;
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}
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if (strcasecmp(key, KEY_OPTIONS) == 0) {
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if (strstr(value, OPTION_LAST_RULE) != NULL) {
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dbg("last rule to be applied");
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rule.last_rule = 1;
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}
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if (strstr(value, OPTION_IGNORE_DEVICE) != NULL) {
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dbg("device should be ignored");
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rule.ignore_device = 1;
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}
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if (strstr(value, OPTION_IGNORE_REMOVE) != NULL) {
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dbg("remove event should be ignored");
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rule.ignore_remove = 1;
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}
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if (strstr(value, OPTION_PARTITIONS) != NULL) {
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dbg("creation of partition nodes requested");
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rule.partitions = DEFAULT_PARTITIONS_COUNT;
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}
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valid = 1;
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continue;
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}
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err("unknown key '%s'", key);
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goto error;
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}
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/* skip line if not any valid key was found */
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if (!valid)
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goto error;
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if ((rule.result[0] != '\0') && (program_given == 0)) {
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info(KEY_RESULT " is only useful when " KEY_PROGRAM " is called in any rule before");
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goto error;
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}
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rule.config_line = lineno;
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strlcpy(rule.config_file, filename, sizeof(rule.config_file));
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retval = add_config_dev(&rule);
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if (retval) {
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dbg("add_config_dev returned with error %d", retval);
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continue;
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error:
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err("parse error %s, line %d:%d, rule skipped",
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filename, lineno, (int) (linepos - line));
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}
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}
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file_unmap(buf, bufsize);
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return retval;
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}
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int udev_rules_init(void)
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{
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struct stat stats;
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int retval;
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if (stat(udev_rules_filename, &stats) != 0)
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return -1;
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if ((stats.st_mode & S_IFMT) != S_IFDIR)
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retval = rules_parse(udev_rules_filename);
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else {
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struct name_entry *name_loop, *name_tmp;
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LIST_HEAD(name_list);
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retval = add_matching_files(&name_list, udev_rules_filename, RULEFILE_SUFFIX);
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list_for_each_entry_safe(name_loop, name_tmp, &name_list, node) {
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rules_parse(name_loop->name);
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list_del(&name_loop->node);
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}
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}
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return retval;
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}
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void udev_rules_close(void)
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{
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struct udev_rule *rule;
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struct udev_rule *temp_rule;
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list_for_each_entry_safe(rule, temp_rule, &udev_rule_list, node) {
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list_del(&rule->node);
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free(rule);
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}
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}
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