MinGW 4.x has unistd.h in \MinGW\include, \MinGW\include\sys and \MinGW\lib\gcc\mingw32\4.6.2\include\ssp
Here is the code for the MinGW version, by Rob Savoye; modified by Earnie Boyd, Danny Smith, Ramiro Polla, Gregory McGarry and Keith Marshall:
/*
* unistd.h
*
* Standard header file declaring MinGW's POSIX compatibility features.
*
* $Id: unistd.h,v c3ebd36f8211 2016/02/16 16:05:39 keithmarshall $
*
* Written by Rob Savoye <[email protected]>
* Modified by Earnie Boyd <[email protected]>
* Danny Smith <[email protected]>
* Ramiro Polla <[email protected]>
* Gregory McGarry <[email protected]>
* Keith Marshall <[email protected]>
* Copyright (C) 1997, 1999, 2002-2004, 2007-2009, 2014-2016,
* 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 <io.h>
* Other headers included by <unistd.h> may be selectively processed;
* __UNISTD_H_SOURCED__ enables such selective processing.
*/
#define __UNISTD_H_SOURCED__ 1
#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
* <time.h>), 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 <time.h>, (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, REMAPPED = _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 */
This file requires the inclusion of _mingw.h, which is as follows:
#ifndef __MINGW_H
/*
* _mingw.h
*
* MinGW specific macros included by ALL mingwrt include files; (this file
* is part of the MinGW32 runtime library package).
*
* $Id: _mingw.h.in,v 7daa0459f602 2016/05/03 17:40:54 keithmarshall $
*
* Written by Mumit Khan <[email protected]>
* Copyright (C) 1999, 2001-2011, 2014-2016, 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 and this permission notice (including the next
* paragraph) 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 OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
#define __MINGW_H
/* In previous versions, __MINGW32_VERSION was expressed as a dotted
* numeric pair, representing major.minor; unfortunately, this doesn't
* adapt well to the inclusion of a patch-level component, since the
* major.minor.patch dotted triplet representation is not valid as a
* numeric entity. Thus, for this version, we adopt a representation
* which encodes the version as a long integer value, expressing:
*
* __MINGW32_VERSION = 1,000,000 * major + 1,000 * minor + patch
*
* DO NOT EDIT these package version assignments manually; they are
* derived from the package version specification within configure.ac,
* whence they are propagated automatically, at package build time.
*/
#define __MINGW32_VERSION 3022001L
#define __MINGW32_MAJOR_VERSION 3
#define __MINGW32_MINOR_VERSION 22
#define __MINGW32_PATCHLEVEL 1
#if __GNUC__ >= 3 && ! defined __PCC__
#pragma GCC system_header
#endif
#ifndef _MSVCRTVER_H
/* Legacy versions of mingwrt use the macro __MSVCRT_VERSION__ to
* enable evolving features of different MSVCRT.DLL versions. This
* usage is no longer recommended, but the __MSVCRT_VERSION__ macro
* remains useful when a non-freely distributable MSVCRxx.DLL is to
* be substituted for MSVCRT.DLL; for such usage, the substitute
* MSVCRxx.DLL may be identified as specified in...
*/
# include <msvcrtver.h>
#endif
/* A better inference than __MSVCRT_VERSION__, of the capabilities
* supported by the operating system default MSVCRT.DLL, is provided
* by the Windows API version identification macros.
*/
#include <w32api.h>
/* The following are defined by the user (or by the compiler), to specify how
* identifiers are imported from a DLL. All headers should include this first,
* and then use __DECLSPEC_SUPPORTED to choose between the old ``__imp__name''
* style or the __MINGW_IMPORT style for declarations.
*
* __DECLSPEC_SUPPORTED Defined if dllimport attribute is supported.
* __MINGW_IMPORT The attribute definition to specify imported
* variables/functions.
* _CRTIMP As above. For MS compatibility.
*
* Macros to enable MinGW features which deviate from standard MSVC
* compatible behaviour; these may be specified directly in user code,
* activated implicitly, (e.g. by specifying _POSIX_C_SOURCE or such),
* or by inclusion in __MINGW_FEATURES__:
*
* __USE_MINGW_ANSI_STDIO Select a more ANSI C99 compatible
* implementation of printf() and friends;
* (users should not set this directly).
*
* Other macros:
*
* __int64 define to be long long. Using a typedef
* doesn't work for "unsigned __int64"
*
*
* Manifest definitions for flags to control globbing of the command line
* during application start up, (before main() is called). The first pair,
* when assigned as bit flags within _CRT_glob, select the globbing algorithm
* to be used; (the MINGW algorithm overrides MSCVRT, if both are specified).
* Prior to mingwrt-3.21, only the MSVCRT option was supported; this choice
* may produce different results, depending on which particular version of
* MSVCRT.DLL is in use; (in recent versions, it seems to have become
* definitively broken, when globbing within double quotes).
*/
#define __CRT_GLOB_USE_MSVCRT__ 0x0001
/* From mingwrt-3.21 onward, this should be the preferred choice; it will
* produce consistent results, regardless of the MSVCRT.DLL version in use.
*/
#define __CRT_GLOB_USE_MINGW__ 0x0002
/* When the __CRT_GLOB_USE_MINGW__ flag is set, within _CRT_glob, the
* following additional options are also available; they are not enabled
* by default, but the user may elect to enable any combination of them,
* by setting _CRT_glob to the boolean sum (i.e. logical OR combination)
* of __CRT_GLOB_USE_MINGW__ and the desired options.
*
* __CRT_GLOB_USE_SINGLE_QUOTE__ allows use of single (apostrophe)
* quoting characters, analogously to
* POSIX usage, as an alternative to
* double quotes, for collection of
* arguments separated by white space
* into a single logical argument.
*
* __CRT_GLOB_BRACKET_GROUPS__ enable interpretation of bracketed
* character groups as POSIX compatible
* globbing patterns, matching any one
* character which is either included
* in, or excluded from the group.
*
* __CRT_GLOB_CASE_SENSITIVE__ enable case sensitive matching for
* globbing patterns; this is default
* behaviour for POSIX, but because of
* the case insensitive nature of the
* MS-Windows file system, it is more
* appropriate to use case insensitive
* globbing as the MinGW default.
*
*/
#define __CRT_GLOB_USE_SINGLE_QUOTE__ 0x0010
#define __CRT_GLOB_BRACKET_GROUPS__ 0x0020
#define __CRT_GLOB_CASE_SENSITIVE__ 0x0040
/* The MinGW globbing algorithm uses the ASCII DEL control code as a marker
* for globbing characters which were embedded within quoted arguments; (the
* quotes are stripped away BEFORE the argument is globbed; the globbing code
* treats the marked character as immutable, and strips out the DEL markers,
* before storing the resultant argument). The DEL code is mapped to this
* function here; DO NOT change it, without rebuilding the runtime.
*/
#define __CRT_GLOB_ESCAPE_CHAR__ (char)(127)
/* Manifest definitions identifying the flag bits, controlling activation
* of MinGW features, as specified by the user in __MINGW_FEATURES__.
*/
#define __MINGW_ANSI_STDIO__ 0x0000000000000001ULL
/*
* The following three are not yet formally supported; they are
* included here, to document anticipated future usage.
*/
#define __MINGW_LC_EXTENSIONS__ 0x0000000000000050ULL
#define __MINGW_LC_MESSAGES__ 0x0000000000000010ULL
#define __MINGW_LC_ENVVARS__ 0x0000000000000040ULL
/* Try to avoid problems with outdated checks for GCC __attribute__ support.
*/
#undef __attribute__
#if defined (__PCC__)
# undef __DECLSPEC_SUPPORTED
# ifndef __MINGW_IMPORT
# define __MINGW_IMPORT extern
# endif
# ifndef _CRTIMP
# define _CRTIMP
# endif
# ifndef __cdecl
# define __cdecl _Pragma("cdecl")
# endif
# ifndef __stdcall
# define __stdcall _Pragma("stdcall")
# endif
# ifndef __int64
# define __int64 long long
# endif
# ifndef __int32
# define __int32 long
# endif
# ifndef __int16
# define __int16 short
# endif
# ifndef __int8
# define __int8 char
# endif
# ifndef __small
# define __small char
# endif
# ifndef __hyper
# define __hyper long long
# endif
# ifndef __volatile__
# define __volatile__ volatile
# endif
# ifndef __restrict__
# define __restrict__ restrict
# endif
# define NONAMELESSUNION
#elif defined(__GNUC__)
# ifdef __declspec
# ifndef __MINGW_IMPORT
/* Note the extern. This is needed to work around GCC's
limitations in handling dllimport attribute. */
# define __MINGW_IMPORT extern __attribute__((__dllimport__))
# endif
# ifndef _CRTIMP
# ifdef __USE_CRTIMP
# define _CRTIMP __attribute__((dllimport))
# else
# define _CRTIMP
# endif
# endif
# define __DECLSPEC_SUPPORTED
# else /* __declspec */
# undef __DECLSPEC_SUPPORTED
# undef __MINGW_IMPORT
# ifndef _CRTIMP
# define _CRTIMP
# endif
# endif /* __declspec */
/*
* The next two defines can cause problems if user code adds the
* __cdecl attribute like so:
* void __attribute__ ((__cdecl)) foo(void);
*/
# ifndef __cdecl
# define __cdecl __attribute__((__cdecl__))
# endif
# ifndef __stdcall
# define __stdcall __attribute__((__stdcall__))
# endif
# ifndef __int64
# define __int64 long long
# endif
# ifndef __int32
# define __int32 long
# endif
# ifndef __int16
# define __int16 short
# endif
# ifndef __int8
# define __int8 char
# endif
# ifndef __small
# define __small char
# endif
# ifndef __hyper
# define __hyper long long
# endif
#else /* ! __GNUC__ && ! __PCC__ */
# ifndef __MINGW_IMPORT
# define __MINGW_IMPORT __declspec(dllimport)
# endif
# ifndef _CRTIMP
# define _CRTIMP __declspec(dllimport)
# endif
# define __DECLSPEC_SUPPORTED
# define __attribute__(x) /* nothing */
#endif
#if defined (__GNUC__) && defined (__GNUC_MINOR__)
#define __MINGW_GNUC_PREREQ(major, minor) \
(__GNUC__ > (major) \
|| (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
#else
#define __MINGW_GNUC_PREREQ(major, minor) 0
#endif
#ifdef __cplusplus
# define __CRT_INLINE inline
#else
# if __GNUC_STDC_INLINE__
# define __CRT_INLINE extern inline __attribute__((__gnu_inline__))
# else
# define __CRT_INLINE extern __inline__
# endif
#endif
# ifdef __GNUC__
/* A special form of __CRT_INLINE is provided; it will ALWAYS request
* inlining when possible. Originally specified as _CRTALIAS, this is
* now deprecated in favour of __CRT_ALIAS, for syntactic consistency
* with __CRT_INLINE itself.
*/
# define _CRTALIAS __CRT_INLINE __attribute__((__always_inline__))
# define __CRT_ALIAS __CRT_INLINE __attribute__((__always_inline__))
# else
# define _CRTALIAS __CRT_INLINE /* deprecated form */
# define __CRT_ALIAS __CRT_INLINE /* preferred form */
# endif
/*
* Each function which is implemented as a __CRT_ALIAS should also be
* accompanied by an externally visible interface. The following pair
* of macros provide a mechanism for implementing this, either as a stub
* redirecting to an alternative external function, or by compilation of
* the normally inlined code into free standing object code; each macro
* provides a way for us to offer arbitrary hints for use by the build
* system, while remaining transparent to the compiler.
*/
#define __JMPSTUB__(__BUILD_HINT__)
#define __LIBIMPL__(__BUILD_HINT__)
#ifdef __cplusplus
# define __UNUSED_PARAM(x)
#else
# ifdef __GNUC__
# define __UNUSED_PARAM(x) x __attribute__((__unused__))
# else
# define __UNUSED_PARAM(x) x
# endif
#endif
#ifdef __GNUC__
#define __MINGW_ATTRIB_NORETURN __attribute__((__noreturn__))
#define __MINGW_ATTRIB_CONST __attribute__((__const__))
#else
#define __MINGW_ATTRIB_NORETURN
#define __MINGW_ATTRIB_CONST
#endif
#if __MINGW_GNUC_PREREQ (3, 0)
#define __MINGW_ATTRIB_MALLOC __attribute__((__malloc__))
#define __MINGW_ATTRIB_PURE __attribute__((__pure__))
#else
#define __MINGW_ATTRIB_MALLOC
#define __MINGW_ATTRIB_PURE
#endif
/* Attribute `nonnull' was valid as of gcc 3.3. We don't use GCC's
variadiac macro facility, because variadic macros cause syntax
errors with --traditional-cpp. */
#if __MINGW_GNUC_PREREQ (3, 3)
#define __MINGW_ATTRIB_NONNULL(arg) __attribute__((__nonnull__(arg)))
#else
#define __MINGW_ATTRIB_NONNULL(arg)
#endif /* GNUC >= 3.3 */
#if __MINGW_GNUC_PREREQ (3, 1)
#define __MINGW_ATTRIB_DEPRECATED __attribute__((__deprecated__))
#else
#define __MINGW_ATTRIB_DEPRECATED
#endif /* GNUC >= 3.1 */
#if __MINGW_GNUC_PREREQ (3, 3)
#define __MINGW_NOTHROW __attribute__((__nothrow__))
#else
#define __MINGW_NOTHROW
#endif /* GNUC >= 3.3 */
/* TODO: Mark (almost) all CRT functions as __MINGW_NOTHROW. This will
allow GCC to optimize away some EH unwind code, at least in DW2 case. */
/* Activation of MinGW specific extended features:
*/
#ifndef __USE_MINGW_ANSI_STDIO
/* Users should not set this directly; rather, define one (or more)
* of the feature test macros (tabulated below), or specify any of the
* compiler's command line options, (e.g. -posix, -ansi, or -std=c...),
* which cause _POSIX_SOURCE, or __STRICT_ANSI__ to be defined.
*
* We must check this BEFORE we specifiy any implicit _POSIX_C_SOURCE,
* otherwise we would always implicitly choose __USE_MINGW_ANSI_STDIO,
* even if none of these selectors are specified explicitly...
*/
# if defined __STRICT_ANSI__ || defined _ISOC99_SOURCE \
|| defined _POSIX_SOURCE || defined _POSIX_C_SOURCE \
|| defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED \
|| defined _GNU_SOURCE || defined _BSD_SOURCE \
|| defined _SVID_SOURCE
/*
* but where any of these source code qualifiers are specified,
* then assume ANSI I/O standards are preferred over Microsoft's...
*/
# define __USE_MINGW_ANSI_STDIO 1
# else
/* otherwise use whatever __MINGW_FEATURES__ specifies...
*/
# define __USE_MINGW_ANSI_STDIO (__MINGW_FEATURES__ & __MINGW_ANSI_STDIO__)
# endif
#endif
#ifndef _POSIX_C_SOURCE
/* Users may define this, either directly or indirectly, to explicitly
* enable a particular level of visibility for the subset of those POSIX
* features which are supported by MinGW; (notice that this offers no
* guarantee that any particular POSIX feature will be supported).
*/
# if defined _XOPEN_SOURCE
/* Specifying this is the preferred method for setting _POSIX_C_SOURCE;
* (POSIX defines an explicit relationship to _XOPEN_SOURCE). Note that
* any such explicit setting will augment the set of features which are
* available to any compilation unit, even if it seeks to be strictly
* ANSI-C compliant.
*/
# if _XOPEN_SOURCE < 500
# define _POSIX_C_SOURCE 1L /* POSIX.1-1990 / SUSv1 */
# elif _XOPEN_SOURCE < 600
# define _POSIX_C_SOURCE 199506L /* POSIX.1-1996 / SUSv2 */
# elif _XOPEN_SOURCE < 700
# define _POSIX_C_SOURCE 200112L /* POSIX.1-2001 / SUSv3 */
# else
# define _POSIX_C_SOURCE 200809L /* POSIX.1-2008 / SUSv4 */
# endif
# elif defined _GNU_SOURCE || defined _BSD_SOURCE || ! defined __STRICT_ANSI__
/*
* No explicit level of support has been specified; implicitly grant
* the most comprehensive level to any compilation unit which requests
* either GNU or BSD feature support, or does not seek to be strictly
* ANSI-C compliant.
*/
# define _POSIX_C_SOURCE 200809L
# elif defined _POSIX_SOURCE
/* Now formally deprecated by POSIX, some old code may specify this;
* it will enable a minimal level of POSIX support, in addition to the
* limited feature set enabled for strict ANSI-C conformity.
*/
# define _POSIX_C_SOURCE 1L
# endif
#endif
#ifndef _ISOC99_SOURCE
/* libmingwex.a provides free-standing implementations for many of the
* functions which were introduced in C99; MinGW headers do not expose
* prototypes for these, unless this feature test macro is defined, by
* the user, or implied by other standards...
*/
# if __STDC_VERSION__ >= 199901L || _POSIX_C_SOURCE >= 200112L
# define _ISOC99_SOURCE 1
# endif
#endif
#if ! defined _MINGW32_SOURCE_EXTENDED && ! defined __STRICT_ANSI__
/*
* Enable mingw32 extensions by default, except when __STRICT_ANSI__
* conformity mode has been enabled.
*/
# define _MINGW32_SOURCE_EXTENDED 1
#endif
#endif /* __MINGW_H: $RCSfile: _mingw.h.in,v $: end of file */
The rest of the includes should be standard to your environment.