[moveonly] Split glibc sanity_test_fdelt out

1 files changed, 23 insertions, 0 deletions

diff --git a/src/compat/glibc_sanity_fdelt.cpp b/src/compat/glibc_sanity_fdelt.cpp
new file mode 100644
index 0000000000..13661d3eef
--- /dev/null
+++ b/src/compat/glibc_sanity_fdelt.cpp
@@ -0,0 +1,23 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#if defined(HAVE_SYS_SELECT_H)
+#include <sys/select.h>
+
+// trigger: Call FD_SET to trigger __fdelt_chk. FORTIFY_SOURCE must be defined
+//   as >0 and optimizations must be set to at least -O2.
+// test: Add a file descriptor to an empty fd_set. Verify that it has been
+//   correctly added.
+bool sanity_test_fdelt()
+{
+    fd_set fds;
+    FD_ZERO(&fds);
+    FD_SET(0, &fds);
+    return FD_ISSET(0, &fds);
+}
+#endif