path-util: paths_check_timestamp() opimizations

[elogind.git] / src / shared / path-util.c

diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 45099eeda8d6dc3898467bd31a5b8a087bcdb901..6c4efbfd9442058c7c74c404468871996e89cd2b 100644 (file)
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -428,6 +428,8 @@ int path_is_os_tree(const char *path) {
 
 int find_binary(const char *name, char **filename) {
         assert(name);
+        assert(filename);
+
         if (strchr(name, '/')) {
                 char *p;
 
@@ -473,3 +475,38 @@ int find_binary(const char *name, char **filename) {
                 return -ENOENT;
         }
 }
+
+bool paths_check_timestamp(char **paths, usec_t *timestamp, bool update) {
+        bool changed = false;
+        char **i;
+
+        assert(timestamp);
+
+        if (paths == NULL)
+                return false;
+
+        STRV_FOREACH(i, paths) {
+                struct stat stats;
+                usec_t u;
+
+                if (stat(*i, &stats) < 0)
+                        continue;
+
+                u = timespec_load(&stats.st_mtim);
+
+                /* first check */
+                if (*timestamp >= u)
+                        continue;
+
+                log_debug("timestamp of '%s' changed\n", *i);
+
+                /* update timestamp */
+                if (update) {
+                        *timestamp = u;
+                        changed = true;
+                } else
+                        return true;
+        }
+
+        return changed;
+}