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