X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Futil.c;h=71409034a4e15cb0c35fbbd2994e520cccfbea7c;hp=2bc90da3d2b20bf92ad239c265d42f924e968e77;hb=d3782d60cd47f57f48a9229bdd3badbd2f4bae44;hpb=10e87ee7f66b59a504c0ed2025463ba5faa69923;ds=sidebyside

diff --git a/src/util.c b/src/util.c
index 2bc90da3d..71409034a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -2141,6 +2141,26 @@ int dir_is_empty(const char *path) {
         return r;
 }
 
+unsigned long long random_ull(void) {
+        int fd;
+        uint64_t ull;
+        ssize_t r;
+
+        if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
+                goto fallback;
+
+        r = loop_read(fd, &ull, sizeof(ull));
+        close_nointr_nofail(fd);
+
+        if (r != sizeof(ull))
+                goto fallback;
+
+        return ull;
+
+fallback:
+        return random() * RAND_MAX + random();
+}
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",