udevd: print warning if CONFIG_SYSFS_DEPRECATED is used

[elogind.git] / udev / udevd.c

diff --git a/udev/udevd.c b/udev/udevd.c
index 1f8483c301dde3c91e7e775ffede2332c903ca6d..9783fe4e7c545db6bc37e450c06050ea57747870 100644 (file)
--- a/udev/udevd.c
+++ b/udev/udevd.c
@@ -953,9 +953,21 @@ int main(int argc, char *argv[])
 
        fd = open("/dev/kmsg", O_WRONLY);
        if (fd > 0) {
-               const char *str = "<6>udevd version " VERSION " started\n";
-
-               write(fd, str, strlen(str));
+               const char *ver_str = "<6>udev: starting version " VERSION "\n";
+               char path[UTIL_PATH_SIZE];
+               struct stat statbuf;
+
+               write(fd, ver_str, strlen(ver_str));
+               util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
+               util_strlcat(path, "/class/mem/null", sizeof(path));
+               if (lstat(path, &statbuf) == 0) {
+                       if (S_ISDIR(statbuf.st_mode)) {
+                               const char *depr_str = "<6>udev: deprecated sysfs layout "
+                                                      "(CONFIG_SYSFS_DEPRECATED) is unsupported\n";
+
+                               write(fd, depr_str, strlen(depr_str));
+                       }
+               }
                close(fd);
        }