1 files changed, 22 insertions, 2 deletions

diff --git a/miscutils/seedrng.c b/miscutils/seedrng.c
index 967741dc7..3bf6e2ea7 100644
--- a/miscutils/seedrng.c
+++ b/miscutils/seedrng.c
@@ -42,11 +42,31 @@
 #include "libbb.h"
 
 #include <linux/random.h>
-#include <sys/random.h>
 #include <sys/file.h>
 
+/* Fix up glibc <= 2.24 not having getrandom() */
+#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ <= 24
+#include <sys/syscall.h>
+static ssize_t getrandom(void *buffer, size_t length, unsigned flags)
+{
+# if defined(__NR_getrandom)
+        return syscall(__NR_getrandom, buffer, length, flags);
+# else
+        errno = ENOSYS;
+        return -1;
+# endif
+}
+#else
+#include <sys/random.h>
+#endif
+
+/* Apparently some headers don't ship with this yet. */
+#ifndef GRND_NONBLOCK
+#define GRND_NONBLOCK 0x0001
+#endif
+
 #ifndef GRND_INSECURE
-#define GRND_INSECURE 0x0004 /* Apparently some headers don't ship with this yet. */
+#define GRND_INSECURE 0x0004
 #endif
 
 #define DEFAULT_SEED_DIR         "/var/lib/seedrng"