src/shared/udev-util.c

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