mirror of
https://github.com/systemd/systemd.git
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353 lines
7.7 KiB
C
353 lines
7.7 KiB
C
/*
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* libudev - interface to udev device information
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*
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* Copyright (C) 2008 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
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <ctype.h>
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#include "libudev.h"
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#include "libudev-private.h"
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#include "../udev.h"
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struct udev {
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int refcount;
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void (*log_fn)(struct udev *udev,
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int priority, const char *file, int line, const char *fn,
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const char *format, va_list args);
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char *sys_path;
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char *dev_path;
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char *rules_path;
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int log_priority;
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int run:1;
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};
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void udev_log(struct udev *udev,
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int priority, const char *file, int line, const char *fn,
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const char *format, ...)
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{
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va_list args;
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if (priority > udev->log_priority)
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return;
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va_start(args, format);
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udev->log_fn(udev, priority, file, line, fn, format, args);
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va_end(args);
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}
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static void log_stderr(struct udev *udev,
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int priority, const char *file, int line, const char *fn,
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const char *format, va_list args)
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{
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fprintf(stderr, "libudev: %s: ", fn);
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vfprintf(stderr, format, args);
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}
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/**
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* udev_new:
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*
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* Create udev library context.
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*
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* The initial refcount is 1, and needs to be decremented to
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* release the ressources of the udev library context.
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*
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* Returns: a new udev library context
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**/
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struct udev *udev_new(void)
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{
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struct udev *udev;
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const char *env;
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char *config_file;
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FILE *f;
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udev = malloc(sizeof(struct udev));
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if (udev == NULL)
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return NULL;
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memset(udev, 0x00, (sizeof(struct udev)));
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sysfs_init();
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/* defaults */
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udev->refcount = 1;
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udev->log_fn = log_stderr;
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udev->log_priority = LOG_ERR;
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udev->run = 1;
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udev->dev_path = strdup(UDEV_PREFIX "/dev");
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udev->sys_path = strdup("/sys");
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config_file = strdup(SYSCONFDIR "/udev/udev.conf");
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if (udev->dev_path == NULL ||
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udev->sys_path == NULL ||
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config_file == NULL)
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goto err;
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/* settings by environment and config file */
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env = getenv("SYSFS_PATH");
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if (env != NULL) {
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free(udev->sys_path);
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udev->sys_path = strdup(env);
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remove_trailing_chars(udev->sys_path, '/');
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}
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env = getenv("UDEV_RUN");
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if (env != NULL && !string_is_true(env))
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udev->run = 0;
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env = getenv("UDEV_CONFIG_FILE");
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if (env != NULL) {
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free(config_file);
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config_file = strdup(env);
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remove_trailing_chars(config_file, '/');
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}
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if (config_file == NULL)
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goto err;
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f = fopen(config_file, "r");
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if (f != NULL) {
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char line[LINE_SIZE];
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int line_nr = 0;
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while (fgets(line, sizeof(line), f)) {
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size_t len;
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char *key;
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char *val;
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line_nr++;
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/* find key */
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key = line;
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while (isspace(key[0]))
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key++;
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/* comment or empty line */
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if (key[0] == '#' || key[0] == '\0')
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continue;
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/* split key/value */
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val = strchr(key, '=');
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if (val == NULL) {
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err(udev, "missing <key>=<value> in '%s'[%i], skip line\n", config_file, line_nr);
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continue;
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}
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val[0] = '\0';
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val++;
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/* find value */
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while (isspace(val[0]))
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val++;
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/* terminate key */
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len = strlen(key);
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if (len == 0)
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continue;
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while (isspace(key[len-1]))
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len--;
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key[len] = '\0';
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/* terminate value */
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len = strlen(val);
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if (len == 0)
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continue;
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while (isspace(val[len-1]))
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len--;
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val[len] = '\0';
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if (len == 0)
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continue;
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/* unquote */
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if (val[0] == '"' || val[0] == '\'') {
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if (val[len-1] != val[0]) {
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err(udev, "inconsistent quoting in '%s'[%i], skip line\n", config_file, line_nr);
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continue;
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}
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val[len-1] = '\0';
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val++;
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}
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if (strcasecmp(key, "udev_log") == 0) {
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udev->log_priority = log_priority(val);
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continue;
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}
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if (strcasecmp(key, "udev_root") == 0) {
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free(udev->dev_path);
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udev->dev_path = strdup(val);
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remove_trailing_chars(udev->dev_path, '/');
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continue;
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}
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if (strcasecmp(key, "udev_rules") == 0) {
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free(udev->rules_path);
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udev->rules_path = strdup(val);
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remove_trailing_chars(udev->rules_path, '/');
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continue;
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}
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}
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fclose(f);
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}
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env = getenv("UDEV_ROOT");
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if (env != NULL) {
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free(udev->dev_path);
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udev->dev_path = strdup(env);
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remove_trailing_chars(udev->dev_path, '/');
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}
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env = getenv("UDEV_LOG");
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if (env != NULL)
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udev->log_priority = log_priority(env);
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if (udev->dev_path == NULL || udev->sys_path == NULL)
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goto err;
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info(udev, "context %p created\n", udev);
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info(udev, "log_priority=%d\n", udev->log_priority);
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info(udev, "config_file='%s'\n", config_file);
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info(udev, "dev_path='%s'\n", udev->dev_path);
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info(udev, "sys_path='%s'\n", udev->sys_path);
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if (udev->rules_path != NULL)
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info(udev, "rules_path='%s'\n", udev->rules_path);
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free(config_file);
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return udev;
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err:
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free(config_file);
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err(udev, "context creation failed\n");
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udev_unref(udev);
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return NULL;
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}
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/**
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* udev_ref:
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* @udev: udev library context
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*
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* Take a reference of the udev library context.
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*
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* Returns: the passed udev library context
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**/
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struct udev *udev_ref(struct udev *udev)
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{
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if (udev == NULL)
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return NULL;
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udev->refcount++;
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return udev;
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}
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/**
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* udev_unref:
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* @udev: udev library context
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*
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* Drop a reference of the udev library context. If the refcount
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* reaches zero, the ressources of the context will be released.
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*
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**/
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void udev_unref(struct udev *udev)
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{
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if (udev == NULL)
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return;
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udev->refcount--;
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if (udev->refcount > 0)
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return;
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sysfs_cleanup();
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free(udev->dev_path);
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free(udev->sys_path);
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free(udev->rules_path);
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info(udev, "context %p released\n", udev);
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free(udev);
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}
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/**
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* udev_set_log_fn:
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* @udev: udev library context
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* @log_fn: function to be called for logging messages
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*
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* The built-in logging, which writes to stderr if the
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* LIBUDEV_DEBUG environment variable is set, can be
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* overridden by a custom function, to plug log messages
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* into the users logging functionality.
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*
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**/
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void udev_set_log_fn(struct udev *udev,
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void (*log_fn)(struct udev *udev,
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int priority, const char *file, int line, const char *fn,
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const char *format, va_list args))
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{
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udev->log_fn = log_fn;
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info(udev, "custom logging function %p registered\n", udev);
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}
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int udev_get_log_priority(struct udev *udev)
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{
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return udev->log_priority;
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}
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void udev_set_log_priority(struct udev *udev, int priority)
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{
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udev->log_priority = priority;
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}
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const char *udev_get_rules_path(struct udev *udev)
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{
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return udev->rules_path;
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}
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int udev_get_run(struct udev *udev)
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{
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return udev->run;
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}
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/**
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* udev_get_sys_path:
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* @udev: udev library context
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*
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* Retrieve the sysfs mount point. The default is "/sys". For
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* testing purposes, it can be overridden with the environment
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* variable SYSFS_PATH.
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*
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* Returns: the sys mount point
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**/
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const char *udev_get_sys_path(struct udev *udev)
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{
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if (udev == NULL)
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return NULL;
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return udev->sys_path;
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}
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/**
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* udev_get_dev_path:
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* @udev: udev library context
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*
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* Retrieve the device directory path. The default value is "/dev",
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* the actual value may be overridden in the udev configuration
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* file.
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*
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* Returns: the device directory path
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**/
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const char *udev_get_dev_path(struct udev *udev)
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{
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if (udev == NULL)
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return NULL;
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return udev->dev_path;
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}
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