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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 | |
29 | support_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 | } |