107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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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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// Ports of standard functions that don't exist on a specific platform.
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//
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// Note these are NOT in the "android" namespace.
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//
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#include <utils/ported.h>
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#if defined(NEED_GETTIMEOFDAY) || defined(NEED_USLEEP)
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# include <sys/time.h>
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# include <windows.h>
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#endif
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#if defined(NEED_GETTIMEOFDAY)
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/*
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* Replacement gettimeofday() for Windows environments (primarily MinGW).
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*
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* Ignores "tz".
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*/
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int gettimeofday(struct timeval* ptv, struct timezone* tz)
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{
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long long nsTime; // time in 100ns units since Jan 1 1601
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FILETIME ft;
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if (tz != NULL) {
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// oh well
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}
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::GetSystemTimeAsFileTime(&ft);
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nsTime = (long long) ft.dwHighDateTime << 32 |
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(long long) ft.dwLowDateTime;
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// convert to time in usec since Jan 1 1970
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ptv->tv_usec = (long) ((nsTime / 10LL) % 1000000LL);
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ptv->tv_sec = (long) ((nsTime - 116444736000000000LL) / 10000000LL);
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return 0;
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}
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#endif
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#if defined(NEED_USLEEP)
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//
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// Replacement usleep for Windows environments (primarily MinGW).
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//
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void usleep(unsigned long usec)
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{
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// Win32 API function Sleep() takes milliseconds
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::Sleep((usec + 500) / 1000);
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}
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#endif
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#if 0 //defined(NEED_PIPE)
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//
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// Replacement pipe() command for MinGW
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//
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// The _O_NOINHERIT flag sets bInheritHandle to FALSE in the
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// SecurityAttributes argument to CreatePipe(). This means the handles
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// aren't inherited when a new process is created. The examples I've seen
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// use it, possibly because there's a lot of junk going on behind the
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// scenes. (I'm assuming "process" and "thread" are different here, so
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// we should be okay spinning up a thread.) The recommended practice is
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// to dup() the descriptor you want the child to have.
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//
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// It appears that unnamed pipes can't do non-blocking ("overlapped") I/O.
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// You can't use select() either, since that only works on sockets. The
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// Windows API calls that are useful here all operate on a HANDLE, not
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// an integer file descriptor, and I don't think you can get there from
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// here. The "named pipe" stuff is insane.
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//
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int pipe(int filedes[2])
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{
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return _pipe(filedes, 0, _O_BINARY | _O_NOINHERIT);
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}
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#endif
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#if defined(NEED_SETENV)
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/*
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* MinGW lacks these. For now, just stub them out so the code compiles.
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*/
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int setenv(const char* name, const char* value, int overwrite)
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{
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return 0;
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}
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void unsetenv(const char* name)
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{
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}
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char* getenv(const char* name)
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{
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return NULL;
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}
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#endif
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