/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version. Copyright (C) 2003, 2004 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/>. */ #include <errno.h> #include <sysdep.h> #include <time.h> #include <sys/time.h> #include "kernel-posix-cpu-timers.h" #define SYSCALL_GETTIME \ retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \ break /* The REALTIME and MONOTONIC clock are definitely supported in the kernel. */ #define SYSDEP_GETTIME \ SYSDEP_GETTIME_CPUTIME \ case CLOCK_REALTIME: \ case CLOCK_MONOTONIC: \ SYSCALL_GETTIME /* We handled the REALTIME clock here. */ #define HANDLED_REALTIME 1 #define HANDLED_CPUTIME 1 #define SYSDEP_GETTIME_CPU SYSCALL_GETTIME #define SYSDEP_GETTIME_CPUTIME /* Default catches them too. */ static inline int realtime_gettime (struct timespec *tp) { struct timeval tv; int retval = gettimeofday (&tv, NULL); if (retval == 0) /* Convert into `timespec'. */ TIMEVAL_TO_TIMESPEC (&tv, tp); return retval; } /* Get current value of CLOCK and store it in TP. */ int clock_gettime (clockid_t clock_id, struct timespec *tp) { int retval = -1; #ifndef HANDLED_REALTIME struct timeval tv; #endif switch (clock_id) { #ifdef SYSDEP_GETTIME SYSDEP_GETTIME; #endif #ifndef HANDLED_REALTIME case CLOCK_REALTIME: retval = gettimeofday (&tv, NULL); if (retval == 0) TIMEVAL_TO_TIMESPEC (&tv, tp); break; #endif default: #ifdef SYSDEP_GETTIME_CPU SYSDEP_GETTIME_CPU; #endif __set_errno (EINVAL); break; } return retval; }