src/shared/udev-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2017 Zbigniew Jędrzejewski-Szmek
   6 ***/
   7
   8 #include <string.h>
   9
  10 #include "fileio.h"
  11 #include "log.h"
  12 #include "string-util.h"
  13 #include "udev-util.h"
  14
  15 int udev_parse_config(void) {
  16         _cleanup_free_ char *val = NULL;
  17         const char *log;
  18         size_t n;
  19         int r;
  20
  21         r = parse_env_file(NULL, "/etc/udev/udev.conf", NEWLINE, "udev_log", &val, NULL);
  22         if (r == -ENOENT || !val)
  23                 return 0;
  24         if (r < 0)
  25                 return r;
  26
  27         /* unquote */
  28         n = strlen(val);
  29         if (n >= 2 &&
  30             ((val[0] == '"' && val[n-1] == '"') ||
  31              (val[0] == '\'' && val[n-1] == '\''))) {
  32                 val[n - 1] = '\0';
  33                 log = val + 1;
  34         } else
  35                 log = val;
  36
  37         /* we set the udev log level here explicitly, this is supposed
  38          * to regulate the code in libudev/ and udev/. */
  39         r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log);
  40         if (r < 0)
  41                 log_debug_errno(r, "/etc/udev/udev.conf: failed to set udev log level '%s', ignoring: %m", log);
  42
  43         return 0;
  44 }
  45
  46 int udev_device_new_from_stat_rdev(struct udev *udev, const struct stat *st, struct udev_device **ret) {
  47         struct udev_device *nd;
  48         char type;
  49
  50         assert(udev);
  51         assert(st);
  52         assert(ret);
  53
  54         if (S_ISBLK(st->st_mode))
  55                 type = 'b';
  56         else if (S_ISCHR(st->st_mode))
  57                 type = 'c';
  58         else
  59                 return -ENOTTY;
  60
  61         nd = udev_device_new_from_devnum(udev, type, st->st_rdev);
  62         if (!nd)
  63                 return -errno;
  64
  65         *ret = nd;
  66         return 0;
  67 }