Add getrandom compat for MacOS, FreeBSD and Cygwin

[lttng-tools.git] / src / common / random.cpp

diff --git a/src/common/random.cpp b/src/common/random.cpp
index ec74688ec976df098f60ea330b3a7ae4eb4903e2..26f51d3a4a0a674e19c3721b69ee5ad23eefa2b0 100644 (file)
--- a/src/common/random.cpp
+++ b/src/common/random.cpp
@@ -72,6 +72,17 @@ void getrandom_nonblock(char *out_data, std::size_t size)
                        errno);
        }
 }
+#elif defined(HAVE_ARC4RANDOM)
+
+#include <stdlib.h>
+
+/*
+ * According to the MacOS / FreeBSD manpage, this function never fails nor blocks.
+ */
+void getrandom_nonblock(char *out_data, std::size_t size)
+{
+       arc4random_buf(out_data, size);
+}
 #else /* defined(__linux__) && defined(SYS_getrandom) && defined(HAVE_SYS_RANDOM_H) */
 __attribute__((noreturn)) void getrandom_nonblock(char *out_data __attribute__((unused)),
                                                  std::size_t size __attribute__((unused)))