Fix server crash due to /dev/urandom

Author: jart

llama.cpp/random.cpp

@@ -0,0 +1,35 @@
+#include <random>
+#include <unistd.h>
+
+// TODO(jart): delete this with next cosmocc update
+
+namespace std {
+
+random_device::random_device(const string& __token)
+{
+    if (__token != "/dev/urandom")
+        __throw_system_error(ENOENT, ("random device not supported " + __token).c_str());
+}
+
+random_device::~random_device()
+{
+}
+
+unsigned
+random_device::operator()()
+{
+    unsigned r;
+    size_t n = sizeof(r);
+    int err = getentropy(&r, n);
+    if (err)
+        __throw_system_error(errno, "random_device getentropy failed");
+    return r;
+}
+
+double
+random_device::entropy() const noexcept
+{
+    return 0;
+}
+
+} // namespace std