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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | /* 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" #ifdef __VDSO_SUPPORT__ #include "ldso.h" #endif #if defined(__UCLIBC_USE_TIME64__) #include "internal/time64_helpers.h" #endif #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_gettime64) #define SYSCALL_GETTIME \ { \ struct __ts64_struct __ts64; \ retval = INLINE_SYSCALL (clock_gettime64, 2, clock_id, &__ts64); \ if (tp) { \ tp->tv_sec = __ts64.tv_sec; \ tp->tv_nsec = __ts64.tv_nsec; \ } \ break; \ } #else #define SYSCALL_GETTIME \ retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \ break #endif /* 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; } int __libc_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; } /* Get current value of CLOCK and store it in TP. */ int clock_gettime (clockid_t clock_id, struct timespec *tp) { #if defined(__VDSO_SUPPORT__) && defined(ARCH_VDSO_CLOCK_GETTIME) return ARCH_VDSO_CLOCK_GETTIME(clock_id, tp); #else return __libc_clock_gettime(clock_id, tp); #endif } |