Make getrandom() platform-compatible

1 files changed, 13 insertions, 1 deletions

diff --git a/src/stdlib/threads.c b/src/stdlib/threads.c
index 9ad68c81..05f5a941 100644
--- a/src/stdlib/threads.c
+++ b/src/stdlib/threads.c
@@ -10,7 +10,6 @@
 #include <stdlib.h>
 #include <pthread.h>
 #include <sys/param.h>
-#include <sys/random.h>
 
 #include "arrays.h"
 #include "datatypes.h"
@@ -21,6 +20,19 @@
 #include "types.h"
 #include "util.h"
 
+#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
+static ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
+    (void)flags;
+    arc4random_buf(buf, buflen);
+    return buflen;
+}
+#elif defined(__linux__)
+// Use getrandom()
+#   include <sys/random.h>
+#else
+    #error "Unsupported platform for secure random number generation"
+#endif
+
 static void *run_thread(Closure_t *closure)
 {
     uint8_t *random_bytes = GC_MALLOC_ATOMIC(40);