glibc_sanity_fdelt.cpp

// 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)
#ifdef HAVE_CSTRING_DEPENDENT_FD_ZERO
#include <cstring>
#endif
#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