96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This is the VDSO for sandboxed binaries. This file just contains the entry
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// points to the VDSO. All of the real work is done in vdso_time.cc
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#define _DEFAULT_SOURCE // ensure glibc provides struct timezone.
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#include <sys/time.h>
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#include <time.h>
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#include "vdso/syscalls.h"
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#include "vdso/vdso_time.h"
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namespace vdso {
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// __vdso_clock_gettime() implements clock_gettime()
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extern "C" int __vdso_clock_gettime(clockid_t clock, struct timespec* ts) {
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int ret;
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switch (clock) {
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case CLOCK_REALTIME:
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ret = ClockRealtime(ts);
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break;
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case CLOCK_MONOTONIC:
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ret = ClockMonotonic(ts);
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break;
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default:
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ret = sys_clock_gettime(clock, ts);
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break;
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}
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return ret;
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}
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extern "C" int clock_gettime(clockid_t clock, struct timespec* ts)
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__attribute__((weak, alias("__vdso_clock_gettime")));
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// __vdso_gettimeofday() implements gettimeofday()
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extern "C" int __vdso_gettimeofday(struct timeval* tv, struct timezone* tz) {
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if (tv) {
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struct timespec ts;
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int ret = ClockRealtime(&ts);
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if (ret) {
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return ret;
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}
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = ts.tv_nsec / 1000;
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}
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// Nobody should be calling gettimeofday() with a non-NULL
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// timezone pointer. If they do then they will get zeros.
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if (tz) {
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tz->tz_minuteswest = 0;
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tz->tz_dsttime = 0;
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}
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return 0;
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}
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extern "C" int gettimeofday(struct timeval* tv, struct timezone* tz)
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__attribute__((weak, alias("__vdso_gettimeofday")));
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// __vdso_time() implements time()
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extern "C" time_t __vdso_time(time_t* t) {
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struct timespec ts;
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ClockRealtime(&ts);
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if (t) {
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*t = ts.tv_sec;
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}
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return ts.tv_sec;
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}
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extern "C" time_t time(time_t* t) __attribute__((weak, alias("__vdso_time")));
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// __vdso_getcpu() implements getcpu()
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extern "C" long __vdso_getcpu(unsigned* cpu, unsigned* node,
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struct getcpu_cache* cache) {
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// No optimizations yet, just make the real system call.
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return sys_getcpu(cpu, node, cache);
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}
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extern "C" long getcpu(unsigned* cpu, unsigned* node,
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struct getcpu_cache* cache)
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__attribute__((weak, alias("__vdso_getcpu")));
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} // namespace vdso
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