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support: Add support_socket_so_timestamp_time64

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Check if the socket support 64-bit network packages timestamps
(SO_TIMESTAMP and SO_TIMESTAMPNS).  This will be used on recvmsg
and recvmmsg tests to check if the timestamp should be generated.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

(cherry picked from 38bc0f4e78)
This commit is contained in:
Adhemerval Zanella 2021-12-13 11:36:42 -03:00
parent aa601d0244
commit e09e7b1492
3 changed files with 53 additions and 0 deletions
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1
support/Makefile
View File

@ -78,6 +78,7 @@ libsupport-routines = \
support_set_small_thread_stack_size \
support_shared_allocate \
support_small_stack_thread_attribute \
support_socket_so_timestamp_time64 \
support_stat_nanoseconds \
support_subprocess \
support_test_compare_blob \

4
support/support.h
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@ -164,6 +164,10 @@ extern bool support_select_modifies_timeout (void);
tv_usec larger than 1000000. */
extern bool support_select_normalizes_timeout (void);
/* Return true if socket FD supports 64-bit timestamps with the SOL_SOCKET
and SO_TIMESTAMP/SO_TIMESTAMPNS. */
extern bool support_socket_so_timestamp_time64 (int fd);
/* Create a timer that trigger after SEC seconds and NSEC nanoseconds. If
REPEAT is true the timer will repeat indefinitely. If CALLBACK is not
NULL, the function will be called when the timer expires; otherwise a

48
support/support_socket_so_timestamp_time64.c Normal file
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@ -0,0 +1,48 @@
/* Return whether socket supports 64-bit timestamps.
Copyright (C) 2022 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
}