| /* time system call for Linux/PowerPC. |
| Copyright (C) 2013-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #if defined(SHARED) && !defined(__clang__) |
| # ifndef __powerpc64__ |
| # define time __redirect_time |
| # else |
| # define __redirect_time time |
| # endif |
| |
| # include <time.h> |
| # include <sysdep.h> |
| # include <dl-vdso.h> |
| # include <libc-vdso.h> |
| # include <dl-machine.h> |
| |
| # ifndef __powerpc64__ |
| # undef time |
| |
| time_t |
| __time_vsyscall (time_t *t) |
| { |
| return INLINE_VSYSCALL (time, 1, t); |
| } |
| |
| /* __GI_time is defined as hidden and for ppc32 it enables the |
| compiler make a local call (symbol@local) for internal GLIBC usage. It |
| means the PLT won't be used and the ifunc resolver will be called directly. |
| For ppc64 a call to a function in another translation unit might use a |
| different toc pointer thus disallowing direct branchess and making internal |
| ifuncs calls safe. */ |
| # undef libc_hidden_def |
| # define libc_hidden_def(name) \ |
| __hidden_ver1 (__time_vsyscall, __GI_time, __time_vsyscall); |
| |
| # endif /* !__powerpc64__ */ |
| |
| static time_t |
| time_syscall (time_t *t) |
| { |
| struct timeval tv; |
| time_t result; |
| |
| if (INLINE_VSYSCALL (gettimeofday, 2, &tv, NULL) < 0) |
| result = (time_t) -1; |
| else |
| result = (time_t) tv.tv_sec; |
| |
| if (t != NULL) |
| *t = result; |
| return result; |
| } |
| |
| # define INIT_ARCH() \ |
| PREPARE_VERSION (linux2615, "LINUX_2.6.15", 123718565); \ |
| void *vdso_time = _dl_vdso_vsym ("__kernel_time", &linux2615); |
| |
| /* If the vDSO is not available we fall back to the syscall. */ |
| libc_ifunc_hidden (__redirect_time, time, |
| vdso_time |
| ? VDSO_IFUNC_RET (vdso_time) |
| : (void *) time_syscall); |
| libc_hidden_def (time) |
| |
| #else |
| |
| #include <sysdeps/posix/time.c> |
| |
| #endif /* !SHARED */ |