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/* Return whether socket supports 64-bit timestamps.
Copyright (C) 2022-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/socket.h>
#include <support/support.h>
#ifdef __linux__
# include <socket-constants-time64.h>
#endif
bool
support_socket_so_timestamp_time64 (int fd)
{
#ifdef __linux__
# if __LINUX_KERNEL_VERSION >= 0x050100 \
|| __WORDSIZE == 64 \
|| (defined __SYSCALL_WORDSIZE && __SYSCALL_WORDSIZE == 64)
return true;
# else
int level = SOL_SOCKET;
int optname = COMPAT_SO_TIMESTAMP_NEW;
int optval;
socklen_t len = sizeof (optval);
int r = syscall (__NR_getsockopt, fd, level, optname, &optval, &len);
return r != -1;
# endif
#else
return false;
#endif
}
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