From 539618a0ddc2dc7f0fbe28de2ae0e07b34c81e60 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 29 Oct 2014 17:06:32 +0100
Subject: util: make use of the new getrandom() syscall if it is available when
 needing entropy

Doesn't require an fd, and could be a bit faster, so let's make use of
it, if it is available.
---
 src/shared/missing.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src/shared/missing.h')

diff --git a/src/shared/missing.h b/src/shared/missing.h
index bb4f8f23a8..5b87e23eec 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -140,6 +140,21 @@ static inline int memfd_create(const char *name, unsigned int flags) {
 }
 #endif
 
+#ifndef __NR_getrandom
+#  if defined __x86_64__
+#    define __NR_getrandom 278
+#  else
+#    warning "__NR_getrandom unknown for your architecture"
+#    define __NR_getrandom 0xffffffff
+#  endif
+#endif
+
+#if !HAVE_DECL_GETRANDOM
+static inline int getrandom(void *buffer, size_t count, unsigned flags) {
+        return syscall(__NR_getrandom, buffer, count, flags);
+}
+#endif
+
 #ifndef BTRFS_IOCTL_MAGIC
 #define BTRFS_IOCTL_MAGIC 0x94
 #endif
-- 
cgit v1.2.3-54-g00ecf