141 lines
5.4 KiB
C
141 lines
5.4 KiB
C
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/*
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* unistd.h
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*
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* Standard header file declaring MinGW's POSIX compatibility features.
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*
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* $Id: unistd.h,v 7fd51383513c 2017/02/11 12:35:12 keithmarshall $
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*
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* Written by Rob Savoye <rob@cygnus.com>
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* Modified by Earnie Boyd <earnie@users.sourceforge.net>
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* Danny Smith <dannysmith@users.sourceforge.net>
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* Ramiro Polla <ramiro@lisha.ufsc.br>
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* Gregory McGarry <gregorymcgarry@users.sourceforge.net>
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* Keith Marshall <keithmarshall@users.sourceforge.net>
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* Copyright (C) 1997, 1999, 2002-2004, 2007-2009, 2014-2017,
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* MinGW.org Project.
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*
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice, this permission notice, and the following
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* disclaimer shall be included in all copies or substantial portions of
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* the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OF OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#ifndef _UNISTD_H
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#define _UNISTD_H 1
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#pragma GCC system_header
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/* All MinGW headers MUST include _mingw.h before anything else,
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* to ensure proper initialization of feature test macros.
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*/
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#include <_mingw.h>
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/* unistd.h maps (roughly) to Microsoft's <io.h>
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* Other headers included by <unistd.h> may be selectively processed;
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* __UNISTD_H_SOURCED__ enables such selective processing.
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*/
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#define __UNISTD_H_SOURCED__ 1
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/* Use "..." inclusion here, to ensure that we get our own headers, which
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* are designed to interoperate with the __UNISTD_H_SOURCED__ filter.
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*/
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#include "io.h"
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#include "process.h"
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#include "getopt.h"
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/* These are defined in stdio.h. POSIX also requires that they
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* are to be consistently defined here; don't guard against prior
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* definitions, as this might conceal inconsistencies.
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*/
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#define SEEK_SET 0
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#define SEEK_CUR 1
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#define SEEK_END 2
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#if _POSIX_C_SOURCE
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/* POSIX process/thread suspension functions; all are supported by a
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* common MinGW API in libmingwex.a, providing for suspension periods
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* ranging from mean values of ~7.5 milliseconds, (see the comments in
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* <time.h>), extending up to a maximum of ~136 years.
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*
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* Note that, whereas POSIX supports early wake-up of any suspended
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* process/thread, in response to a signal, this implementation makes
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* no attempt to emulate this signalling behaviour, (since signals are
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* not well supported by Windows); thus, unless impeded by an invalid
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* argument, this implementation always returns an indication as if
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* the sleeping period ran to completion.
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*/
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_BEGIN_C_DECLS
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__cdecl __MINGW_NOTHROW
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int __mingw_sleep( unsigned long, unsigned long );
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/* The nanosleep() function provides the most general purpose API for
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* process/thread suspension; it is declared in <time.h>, (where it is
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* accompanied by an in-line implementation), rather than here, and it
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* provides for specification of suspension periods in the range from
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* ~7.5 ms mean, (on WinNT derivatives; ~27.5 ms on Win9x), extending
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* up to ~136 years, (effectively eternity).
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*
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* The usleep() function, and its associated useconds_t type specifier
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* were made obsolete in POSIX.1-2008; declared here, only for backward
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* compatibility, its continued use is not recommended. (It is limited
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* to specification of suspension periods ranging from ~7.5 ms mean up
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* to a maximum of 999,999 microseconds only).
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*/
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typedef unsigned long useconds_t __MINGW_ATTRIB_DEPRECATED;
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int __cdecl __MINGW_NOTHROW usleep( useconds_t )__MINGW_ATTRIB_DEPRECATED;
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#ifndef __NO_INLINE__
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__CRT_INLINE __LIBIMPL__(( FUNCTION = usleep ))
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int usleep( useconds_t period ){ return __mingw_sleep( 0, 1000 * period ); }
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#endif
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/* The sleep() function is, perhaps, the most commonly used of all the
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* process/thread suspension APIs; it provides support for specification
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* of suspension periods ranging from 1 second to ~136 years. (However,
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* POSIX recommends limiting the maximum period to 65535 seconds, to
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* maintain portability to platforms with only 16-bit ints).
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*/
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unsigned __cdecl __MINGW_NOTHROW sleep( unsigned );
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#ifndef __NO_INLINE__
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__CRT_INLINE __LIBIMPL__(( FUNCTION = sleep ))
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unsigned sleep( unsigned period ){ return __mingw_sleep( period, 0 ); }
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#endif
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/* POSIX ftruncate() function.
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*
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* Microsoft's _chsize() function is incorrectly described, on MSDN,
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* as a preferred replacement for the POSIX chsize() function. There
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* never was any such POSIX function; the actual POSIX equivalent is
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* the ftruncate() function.
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*/
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int __cdecl ftruncate( int, off_t );
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#ifndef __NO_INLINE__
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__CRT_INLINE __JMPSTUB__(( FUNCTION = ftruncate, DLLENTRY = _chsize ))
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int ftruncate( int __fd, off_t __length ){ return _chsize( __fd, __length ); }
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#endif
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_END_C_DECLS
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#endif /* _POSIX_C_SOURCE */
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#undef __UNISTD_H_SOURCED__
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#endif /* !_UNISTD_H: $RCSfile: unistd.h,v $: end of file */
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