315 lines
9.0 KiB
C
315 lines
9.0 KiB
C
/***
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This file is part of systemd.
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Copyright 2008-2012 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 <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 <time.h>
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#include "libudev.h"
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#include "libudev-private.h"
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#include "missing.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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struct udev_list properties_list;
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int log_priority;
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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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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_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 like a custom logging function.
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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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{
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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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{
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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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{
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struct udev *udev;
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const char *env;
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FILE *f;
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udev = calloc(1, sizeof(struct udev));
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if (udev == NULL)
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return NULL;
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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_list_init(udev, &udev->properties_list, true);
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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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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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udev_err(udev, "missing <key>=<value> in /etc/udev/udev.conf[%i]; skip line\n", 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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udev_err(udev, "inconsistent quoting in /etc/udev/udev.conf[%i]; skip line\n", 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 (strcmp(key, "udev_log") == 0) {
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udev_set_log_priority(udev, util_log_priority(val));
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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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/* environment overrides config */
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env = secure_getenv("UDEV_LOG");
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if (env != NULL)
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udev_set_log_priority(udev, util_log_priority(env));
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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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{
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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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{
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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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udev_list_cleanup(&udev->properties_list);
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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 logging messages
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*
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* The built-in logging writes to stderr. It 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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_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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{
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udev->log_fn = log_fn;
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udev_dbg(udev, "custom logging function %p registered\n", log_fn);
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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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* The initial logging priority is read from the udev config file
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* at startup.
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*
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* Returns: the current logging priority
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**/
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_public_ 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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/**
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* udev_set_log_priority:
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* @udev: udev library context
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* @priority: the new logging priority
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*
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* Set the current logging priority. The value controls which messages
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* are logged.
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**/
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_public_ void udev_set_log_priority(struct udev *udev, int priority)
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{
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char num[32];
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udev->log_priority = priority;
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snprintf(num, sizeof(num), "%u", udev->log_priority);
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udev_add_property(udev, "UDEV_LOG", num);
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}
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struct udev_list_entry *udev_add_property(struct udev *udev, const char *key, const char *value)
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{
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if (value == NULL) {
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struct udev_list_entry *list_entry;
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list_entry = udev_get_properties_list_entry(udev);
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list_entry = udev_list_entry_get_by_name(list_entry, key);
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if (list_entry != NULL)
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udev_list_entry_delete(list_entry);
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return NULL;
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}
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return udev_list_entry_add(&udev->properties_list, key, value);
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}
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struct udev_list_entry *udev_get_properties_list_entry(struct udev *udev)
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{
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return udev_list_get_entry(&udev->properties_list);
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}
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