forked from xuos/xiuos
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/* Copyright JS Foundation and other contributors, http://js.foundation
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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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*/
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/*
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* This source contains libc overrides for the sake of stable benchmarking. If
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* building a binary for the purpose of benchmarking, the object compiled from
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* this source is to be injected into the list of objects-to-be-linked before
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* the list of libraries-to-be-linked to ensure that the linker picks up these
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* implementations.
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*/
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#ifdef __GNUC__
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/*
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* Note:
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* This is nasty and dangerous. However, we only need the timeval structure
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* from sys/time.h. Unfortunately, the same header also declares
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* gettimeofday, which has different declarations on different platforms
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* (e.g., macOS, Linux). So, instead of #ifdef'ing for platforms, we simply
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* tweak the header to declare another function. Don't try this at home.
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*/
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#define gettimeofday __prevent_conflicting_gettimeofday_declarations__
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#include <sys/time.h>
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#undef gettimeofday
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int gettimeofday (struct timeval *, void *);
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/**
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* Useless but stable gettimeofday implementation. Returns Epoch. Ensures that
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* test cases relying on "now" yield stable results.
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*/
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int gettimeofday (struct timeval *tv,
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void *tz)
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{
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(void) tz;
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tv->tv_sec = 0;
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tv->tv_usec = 0;
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return 0;
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} /* gettimeofday */
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#endif /* __GNUC__ */
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int rand (void);
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/**
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* Useless but stable rand implementation. Returns 4. Ensures that test cases
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* relying on randomness yield stable results.
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*/
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int rand (void)
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{
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return 4; /* Chosen by fair dice roll. Guaranteed to be random. */
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} /* rand */
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