[common/client] platform: add portable worker primitives

common/src/platform/linux/random.c

@@ -0,0 +1,43 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "common/random.h"
+
+#include <errno.h>
+#include <stdint.h>
+#include <sys/random.h>
+
+bool lgRandomBytes(void * buffer, size_t size)
+{
+  uint8_t * output = buffer;
+  while (size)
+  {
+    const ssize_t received = getrandom(output, size, 0);
+    if (received < 0 && errno == EINTR)
+      continue;
+    if (received <= 0)
+      return false;
+
+    output += (size_t)received;
+    size   -= (size_t)received;
+  }
+
+  return true;
+}