src/shared/udev-util.c

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