From ff2d528a0a6943bd4247f3c122c145a5b19f0387 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Wed, 4 Jul 2018 18:49:03 -0500
Subject: Add xgetrandom() with probe for new system call (else open/read
 /dev/{,u}random)

---
 lib/portability.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'lib/portability.c')

diff --git a/lib/portability.c b/lib/portability.c
index 38cf5cb9..c42a052e 100644
--- a/lib/portability.c
+++ b/lib/portability.c
@@ -30,6 +30,17 @@ pid_t xfork(void)
 }
 #endif
 
+void xgetrandom(void *buf, unsigned buflen, unsigned flags)
+{
+#if CFG_TOYBOX_GETRANDOM
+  if (buflen != getrandom(buf, buflen, flags)) perror_exit("getrandom");
+#else
+  int fd = xopen(flags ? "/dev/random" : "/dev/urandom", O_RDONLY);
+  xreadall(fd, buf, buflen);
+  close(fd);
+#endif
+}
+
 #if defined(__APPLE__)
 ssize_t getdelim(char **linep, size_t *np, int delim, FILE *stream)
 {
-- 
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