+++ /dev/null
-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <ctype.h>
-#include <time.h>
-
-#include "libudev.h"
-#include "libudev-private.h"
-
-/**
- * SECTION:libudev
- * @short_description: libudev context
- *
- * The context contains the default values read from the udev config file,
- * and is passed to all library operations.
- */
-
-/**
- * udev:
- *
- * Opaque object representing the library context.
- */
-struct udev {
- int refcount;
- void (*log_fn)(struct udev *udev,
- int priority, const char *file, int line, const char *fn,
- const char *format, va_list args);
- void *userdata;
- char *sys_path;
- char *dev_path;
- char *rules_path[4];
- unsigned long long rules_path_ts[4];
- int rules_path_count;
- char *run_path;
- struct udev_list properties_list;
- int log_priority;
-};
-
-void udev_log(struct udev *udev,
- int priority, const char *file, int line, const char *fn,
- const char *format, ...)
-{
- va_list args;
-
- va_start(args, format);
- udev->log_fn(udev, priority, file, line, fn, format, args);
- va_end(args);
-}
-
-static void log_stderr(struct udev *udev,
- int priority, const char *file, int line, const char *fn,
- const char *format, va_list args)
-{
- fprintf(stderr, "libudev: %s: ", fn);
- vfprintf(stderr, format, args);
-}
-
-/**
- * udev_get_userdata:
- * @udev: udev library context
- *
- * Retrieve stored data pointer from library context. This might be useful
- * to access from callbacks like a custom logging function.
- *
- * Returns: stored userdata
- **/
-_public_ void *udev_get_userdata(struct udev *udev)
-{
- if (udev == NULL)
- return NULL;
- return udev->userdata;
-}
-
-/**
- * udev_set_userdata:
- * @udev: udev library context
- * @userdata: data pointer
- *
- * Store custom @userdata in the library context.
- **/
-_public_ void udev_set_userdata(struct udev *udev, void *userdata)
-{
- if (udev == NULL)
- return;
- udev->userdata = userdata;
-}
-
-static char *set_value(char **s, const char *v)
-{
- free(*s);
- *s = strdup(v);
- util_remove_trailing_chars(*s, '/');
- return *s;
-}
-
-/**
- * udev_new:
- *
- * Create udev library context. This reads the udev configuration
- * file, and fills in the default values.
- *
- * The initial refcount is 1, and needs to be decremented to
- * release the resources of the udev library context.
- *
- * Returns: a new udev library context
- **/
-_public_ struct udev *udev_new(void)
-{
- struct udev *udev;
- const char *env;
- char *config_file = NULL;
- FILE *f;
-
- udev = calloc(1, sizeof(struct udev));
- if (udev == NULL)
- return NULL;
- udev->refcount = 1;
- udev->log_fn = log_stderr;
- udev->log_priority = LOG_ERR;
- udev_list_init(udev, &udev->properties_list, true);
-
- /* custom config file */
- env = getenv("UDEV_CONFIG_FILE");
- if (env != NULL) {
- if (set_value(&config_file, env) == NULL)
- goto err;
- udev_add_property(udev, "UDEV_CONFIG_FILE", config_file);
- }
-
- /* default config file */
- if (config_file == NULL)
- config_file = strdup(SYSCONFDIR "/udev/udev.conf");
- if (config_file == NULL)
- goto err;
-
- f = fopen(config_file, "re");
- if (f != NULL) {
- char line[UTIL_LINE_SIZE];
- int line_nr = 0;
-
- while (fgets(line, sizeof(line), f)) {
- size_t len;
- char *key;
- char *val;
-
- line_nr++;
-
- /* find key */
- key = line;
- while (isspace(key[0]))
- key++;
-
- /* comment or empty line */
- if (key[0] == '#' || key[0] == '\0')
- continue;
-
- /* split key/value */
- val = strchr(key, '=');
- if (val == NULL) {
- err(udev, "missing <key>=<value> in '%s'[%i], skip line\n", config_file, line_nr);
- continue;
- }
- val[0] = '\0';
- val++;
-
- /* find value */
- while (isspace(val[0]))
- val++;
-
- /* terminate key */
- len = strlen(key);
- if (len == 0)
- continue;
- while (isspace(key[len-1]))
- len--;
- key[len] = '\0';
-
- /* terminate value */
- len = strlen(val);
- if (len == 0)
- continue;
- while (isspace(val[len-1]))
- len--;
- val[len] = '\0';
-
- if (len == 0)
- continue;
-
- /* unquote */
- if (val[0] == '"' || val[0] == '\'') {
- if (val[len-1] != val[0]) {
- err(udev, "inconsistent quoting in '%s'[%i], skip line\n", config_file, line_nr);
- continue;
- }
- val[len-1] = '\0';
- val++;
- }
-
- if (strcmp(key, "udev_log") == 0) {
- udev_set_log_priority(udev, util_log_priority(val));
- continue;
- }
- if (strcmp(key, "udev_root") == 0) {
- set_value(&udev->dev_path, val);
- continue;
- }
- if (strcmp(key, "udev_run") == 0) {
- set_value(&udev->run_path, val);
- continue;
- }
- if (strcmp(key, "udev_sys") == 0) {
- set_value(&udev->sys_path, val);
- continue;
- }
- if (strcmp(key, "udev_rules") == 0) {
- set_value(&udev->rules_path[0], val);
- udev->rules_path_count = 1;
- continue;
- }
- }
- fclose(f);
- }
-
- /* environment overrides config */
- env = getenv("UDEV_LOG");
- if (env != NULL)
- udev_set_log_priority(udev, util_log_priority(env));
-
- /* set defaults */
- if (udev->dev_path == NULL)
- if (set_value(&udev->dev_path, "/dev") == NULL)
- goto err;
-
- if (udev->sys_path == NULL)
- if (set_value(&udev->sys_path, "/sys") == NULL)
- goto err;
-
- if (udev->run_path == NULL)
- if (set_value(&udev->run_path, "/run/udev") == NULL)
- goto err;
-
- if (udev->rules_path[0] == NULL) {
- /* /usr/lib/udev -- system rules */
- udev->rules_path[0] = strdup(UDEVLIBEXECDIR "/rules.d");
- if (!udev->rules_path[0])
- goto err;
-
- /* /run/udev -- runtime rules */
- if (asprintf(&udev->rules_path[1], "%s/rules.d", udev->run_path) < 0)
- goto err;
-
- /* /etc/udev -- local administration rules */
- udev->rules_path[2] = strdup(SYSCONFDIR "/udev/rules.d");
- if (!udev->rules_path[2])
- goto err;
-
- udev->rules_path_count = 3;
- }
-
- free(config_file);
- return udev;
-err:
- free(config_file);
- err(udev, "context creation failed\n");
- udev_unref(udev);
- return NULL;
-}
-
-/**
- * udev_ref:
- * @udev: udev library context
- *
- * Take a reference of the udev library context.
- *
- * Returns: the passed udev library context
- **/
-_public_ struct udev *udev_ref(struct udev *udev)
-{
- if (udev == NULL)
- return NULL;
- udev->refcount++;
- return udev;
-}
-
-/**
- * udev_unref:
- * @udev: udev library context
- *
- * Drop a reference of the udev library context. If the refcount
- * reaches zero, the resources of the context will be released.
- *
- **/
-_public_ void udev_unref(struct udev *udev)
-{
- if (udev == NULL)
- return;
- udev->refcount--;
- if (udev->refcount > 0)
- return;
- udev_list_cleanup(&udev->properties_list);
- free(udev->dev_path);
- free(udev->sys_path);
- free(udev->rules_path[0]);
- free(udev->rules_path[1]);
- free(udev->rules_path[2]);
- free(udev->run_path);
- free(udev);
-}
-
-/**
- * udev_set_log_fn:
- * @udev: udev library context
- * @log_fn: function to be called for logging messages
- *
- * The built-in logging writes to stderr. It can be
- * overridden by a custom function, to plug log messages
- * into the users' logging functionality.
- *
- **/
-_public_ void udev_set_log_fn(struct udev *udev,
- void (*log_fn)(struct udev *udev,
- int priority, const char *file, int line, const char *fn,
- const char *format, va_list args))
-{
- udev->log_fn = log_fn;
- dbg(udev, "custom logging function %p registered\n", log_fn);
-}
-
-/**
- * udev_get_log_priority:
- * @udev: udev library context
- *
- * The initial logging priority is read from the udev config file
- * at startup.
- *
- * Returns: the current logging priority
- **/
-_public_ int udev_get_log_priority(struct udev *udev)
-{
- return udev->log_priority;
-}
-
-/**
- * udev_set_log_priority:
- * @udev: udev library context
- * @priority: the new logging priority
- *
- * Set the current logging priority. The value controls which messages
- * are logged.
- **/
-_public_ void udev_set_log_priority(struct udev *udev, int priority)
-{
- char num[32];
-
- udev->log_priority = priority;
- snprintf(num, sizeof(num), "%u", udev->log_priority);
- udev_add_property(udev, "UDEV_LOG", num);
-}
-
-int udev_get_rules_path(struct udev *udev, char **path[], unsigned long long *stamp_usec[])
-{
- *path = udev->rules_path;
- if (stamp_usec)
- *stamp_usec = udev->rules_path_ts;
- return udev->rules_path_count;
-}
-
-/**
- * udev_get_sys_path:
- * @udev: udev library context
- *
- * Retrieve the sysfs mount point. The default is "/sys". For
- * testing purposes, it can be overridden with udev_sys=
- * in the udev configuration file.
- *
- * Returns: the sys mount point
- **/
-_public_ const char *udev_get_sys_path(struct udev *udev)
-{
- if (udev == NULL)
- return NULL;
- return udev->sys_path;
-}
-
-/**
- * udev_get_dev_path:
- * @udev: udev library context
- *
- * Retrieve the device directory path. The default value is "/dev",
- * the actual value may be overridden in the udev configuration
- * file.
- *
- * Returns: the device directory path
- **/
-_public_ const char *udev_get_dev_path(struct udev *udev)
-{
- if (udev == NULL)
- return NULL;
- return udev->dev_path;
-}
-
-/**
- * udev_get_run_path:
- * @udev: udev library context
- *
- * Retrieve the udev runtime directory path. The default is "/run/udev".
- *
- * Returns: the runtime directory path
- **/
-_public_ const char *udev_get_run_path(struct udev *udev)
-{
- if (udev == NULL)
- return NULL;
- return udev->run_path;
-}
-
-struct udev_list_entry *udev_add_property(struct udev *udev, const char *key, const char *value)
-{
- if (value == NULL) {
- struct udev_list_entry *list_entry;
-
- list_entry = udev_get_properties_list_entry(udev);
- list_entry = udev_list_entry_get_by_name(list_entry, key);
- if (list_entry != NULL)
- udev_list_entry_delete(list_entry);
- return NULL;
- }
- return udev_list_entry_add(&udev->properties_list, key, value);
-}
-
-struct udev_list_entry *udev_get_properties_list_entry(struct udev *udev)
-{
- return udev_list_get_entry(&udev->properties_list);
-}
~ianmdlvl / elogind.git / blobdiff