1 /* Return whether socket supports 64-bit timestamps. 2 Copyright (C) 2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <errno.h> 20 #include <unistd.h> 21 #include <sys/syscall.h> 22 #include <sys/socket.h> 23 #include <support/support.h> 24 #ifdef __linux__ 25 # include <socket-constants-time64.h> 26 #endif 27 28 bool support_socket_so_timestamp_time64(int fd)29support_socket_so_timestamp_time64 (int fd) 30 { 31 #ifdef __linux__ 32 # if __LINUX_KERNEL_VERSION >= 0x050100 \ 33 || __WORDSIZE == 64 \ 34 || (defined __SYSCALL_WORDSIZE && __SYSCALL_WORDSIZE == 64) 35 return true; 36 # else 37 int level = SOL_SOCKET; 38 int optname = COMPAT_SO_TIMESTAMP_NEW; 39 int optval; 40 socklen_t len = sizeof (optval); 41 42 int r = syscall (__NR_getsockopt, fd, level, optname, &optval, &len); 43 return r != -1; 44 # endif 45 #else 46 return false; 47 #endif 48 } 49