udevtrigger: add device_has_attribute helper

[project/procd.git] / udevtrigger.c

diff --git a/udevtrigger.c b/udevtrigger.c
index be611c7385488a27e39c6beb715a309163c7dd0e..c5628bdce03147b2420010f6320028ce258433bc 100644 (file)
--- a/udevtrigger.c
+++ b/udevtrigger.c
@@ -5,12 +5,12 @@
  *     This program is free software; you can redistribute it and/or modify it
  *     under the terms of the GNU General Public License as published by the
  *     Free Software Foundation version 2 of the License.
- * 
+ *
  *     This program is distributed in the hope that it will be useful, but
  *     WITHOUT ANY WARRANTY; without even the implied warranty of
  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *     General Public License for more details.
- * 
+ *
  *     You should have received a copy of the GNU General Public License along
  *     with this program; if not, write to the Free Software Foundation, Inc.,
  *     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
@@ -21,6 +21,7 @@
 #include <stddef.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdbool.h>
 #include <unistd.h>
 #include <getopt.h>
 #include <errno.h>
@@ -135,21 +136,33 @@ static int sysfs_resolve_link(char *devpath, size_t size)
        return 0;
 }
 
+static bool device_has_attribute(const char *path, const char *attr,
+                                mode_t mode)
+{
+       char filename[PATH_SIZE];
+       struct stat statbuf;
+
+       strlcpy(filename, path, sizeof(filename));
+       strlcat(filename, attr, sizeof(filename));
+
+       if (stat(filename, &statbuf) < 0)
+               return false;
+
+       if (!(statbuf.st_mode & mode))
+               return false;
+
+       return true;
+}
 
 static int device_list_insert(const char *path)
 {
-       char filename[PATH_SIZE];
        char devpath[PATH_SIZE];
        struct stat statbuf;
 
        dbg("add '%s'" , path);
 
        /* we only have a device, if we have an uevent file */
-       strlcpy(filename, path, sizeof(filename));
-       strlcat(filename, "/uevent", sizeof(filename));
-       if (stat(filename, &statbuf) < 0)
-               return -1;
-       if (!(statbuf.st_mode & S_IWUSR))
+       if (!device_has_attribute(path, "/uevent", S_IWUSR))
                return -1;
 
        strlcpy(devpath, &path[4], sizeof(devpath));