254 lines
7.1 KiB
C
254 lines
7.1 KiB
C
/***
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This file is part of systemd.
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Copyright 2008-2014 Kay Sievers <kay@vrfy.org>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <ctype.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libudev.h"
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "libudev-private.h"
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#include "missing.h"
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#include "string-util.h"
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/**
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* SECTION:libudev
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* @short_description: libudev context
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*
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* The context contains the default values read from the udev config file,
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* and is passed to all library operations.
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*/
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/**
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* udev:
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*
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* Opaque object representing the library context.
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*/
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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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void *userdata;
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};
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/**
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* udev_get_userdata:
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* @udev: udev library context
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*
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* Retrieve stored data pointer from library context. This might be useful
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* to access from callbacks.
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*
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* Returns: stored userdata
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**/
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_public_ void *udev_get_userdata(struct udev *udev) {
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if (udev == NULL)
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return NULL;
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return udev->userdata;
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}
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/**
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* udev_set_userdata:
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* @udev: udev library context
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* @userdata: data pointer
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*
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* Store custom @userdata in the library context.
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**/
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_public_ void udev_set_userdata(struct udev *udev, void *userdata) {
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if (udev == NULL)
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return;
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udev->userdata = userdata;
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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. This reads the udev configuration
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* file, and fills in the default values.
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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 resources 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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_public_ struct udev *udev_new(void) {
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struct udev *udev;
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_cleanup_fclose_ FILE *f = NULL;
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udev = new0(struct udev, 1);
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if (udev == NULL)
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return NULL;
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udev->refcount = 1;
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f = fopen("/etc/udev/udev.conf", "re");
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if (f != NULL) {
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char line[UTIL_LINE_SIZE];
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unsigned 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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log_debug("/etc/udev/udev.conf:%u: missing assignment, skipping line.", 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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log_debug("/etc/udev/udev.conf:%u: inconsistent quoting, skipping line.", 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 (streq(key, "udev_log")) {
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int prio;
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prio = util_log_priority(val);
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if (prio < 0)
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log_debug("/etc/udev/udev.conf:%u: invalid log level '%s', ignoring.", line_nr, val);
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else
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log_set_max_level(prio);
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continue;
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}
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}
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}
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return udev;
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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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_public_ struct udev *udev_ref(struct udev *udev) {
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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 resources of the context will be released.
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*
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* Returns: the passed udev library context if it has still an active reference, or #NULL otherwise.
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**/
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_public_ struct udev *udev_unref(struct udev *udev) {
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if (udev == NULL)
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return NULL;
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udev->refcount--;
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if (udev->refcount > 0)
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return udev;
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free(udev);
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return NULL;
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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 log messages
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*
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* This function is deprecated.
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*
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**/
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_public_ 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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return;
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}
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/**
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* udev_get_log_priority:
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* @udev: udev library context
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*
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* This function is deprecated.
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*
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**/
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_public_ int udev_get_log_priority(struct udev *udev) {
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return log_get_max_level();
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}
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/**
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* udev_set_log_priority:
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* @udev: udev library context
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* @priority: the new log priority
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*
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* This function is deprecated.
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*
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**/
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_public_ void udev_set_log_priority(struct udev *udev, int priority) {
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log_set_max_level(priority);
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}
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