diff options
Diffstat (limited to 'support/support_socket_so_timestamp_time64.c')
-rw-r--r-- | support/support_socket_so_timestamp_time64.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/support/support_socket_so_timestamp_time64.c b/support/support_socket_so_timestamp_time64.c new file mode 100644 index 0000000000..eb8f8ef0cc --- /dev/null +++ b/support/support_socket_so_timestamp_time64.c @@ -0,0 +1,56 @@ +/* Return whether socket supports 64-bit timestamps. + Copyright (C) 2021 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); +# ifdef __NR_socketcall + if (r == -1 && errno == ENOSYS) + { + long int args[] = { fd, level, optname, (long int) &optval, + sizeof (optval) }; + r = syscall (__NR_socketcall, 15 /* SOCKOP_getsockopt */ , args); + } +# endif + return r != -1; +# endif +#else + return false; +#endif +} |