4 * Standard header file declaring MinGW's POSIX compatibility features.
8 * Written by Rob Savoye <rob@cygnus.com>
9 * Modified by Earnie Boyd <earnie@users.sourceforge.net>
10 * Danny Smith <dannysmith@users.sourceforge.net>
11 * Ramiro Polla <ramiro@lisha.ufsc.br>
12 * Gregory McGarry <gregorymcgarry@users.sourceforge.net>
13 * Keith Marshall <keithmarshall@users.sourceforge.net>
14 * Copyright (C) 1997, 1999, 2002-2004, 2007-2009, 2014-2017,
18 * Permission is hereby granted, free of charge, to any person obtaining a
19 * copy of this software and associated documentation files (the "Software"),
20 * to deal in the Software without restriction, including without limitation
21 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
22 * and/or sell copies of the Software, and to permit persons to whom the
23 * Software is furnished to do so, subject to the following conditions:
25 * The above copyright notice, this permission notice, and the following
26 * disclaimer shall be included in all copies or substantial portions of
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
30 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
32 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
33 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
34 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OF OR OTHER
35 * DEALINGS IN THE SOFTWARE.
40 #pragma GCC system_header
42 /* All MinGW headers MUST include _mingw.h before anything else,
43 * to ensure proper initialization of feature test macros.
47 /* unistd.h maps (roughly) to Microsoft's <io.h>
48 * Other headers included by <unistd.h> may be selectively processed;
49 * __UNISTD_H_SOURCED__ enables such selective processing.
51 #define __UNISTD_H_SOURCED__ 1
53 /* Use "..." inclusion here, to ensure that we get our own headers, which
54 * are designed to interoperate with the __UNISTD_H_SOURCED__ filter.
60 /* These are defined in stdio.h. POSIX also requires that they
61 * are to be consistently defined here; don't guard against prior
62 * definitions, as this might conceal inconsistencies.
69 /* POSIX process/thread suspension functions; all are supported by a
70 * common MinGW API in libmingwex.a, providing for suspension periods
71 * ranging from mean values of ~7.5 milliseconds, (see the comments in
72 * <time.h>), extending up to a maximum of ~136 years.
74 * Note that, whereas POSIX supports early wake-up of any suspended
75 * process/thread, in response to a signal, this implementation makes
76 * no attempt to emulate this signalling behaviour, (since signals are
77 * not well supported by Windows); thus, unless impeded by an invalid
78 * argument, this implementation always returns an indication as if
79 * the sleeping period ran to completion.
83 __cdecl __MINGW_NOTHROW
84 int __mingw_sleep( unsigned long, unsigned long );
86 /* The nanosleep() function provides the most general purpose API for
87 * process/thread suspension; it is declared in <time.h>, (where it is
88 * accompanied by an in-line implementation), rather than here, and it
89 * provides for specification of suspension periods in the range from
90 * ~7.5 ms mean, (on WinNT derivatives; ~27.5 ms on Win9x), extending
91 * up to ~136 years, (effectively eternity).
93 * The usleep() function, and its associated useconds_t type specifier
94 * were made obsolete in POSIX.1-2008; declared here, only for backward
95 * compatibility, its continued use is not recommended. (It is limited
96 * to specification of suspension periods ranging from ~7.5 ms mean up
97 * to a maximum of 999,999 microseconds only).
99 typedef unsigned long useconds_t __MINGW_ATTRIB_DEPRECATED;
100 int __cdecl __MINGW_NOTHROW usleep( useconds_t )__MINGW_ATTRIB_DEPRECATED;
102 #ifndef __NO_INLINE__
103 __CRT_INLINE __LIBIMPL__(( FUNCTION = usleep ))
104 int usleep( useconds_t period ){ return __mingw_sleep( 0, 1000 * period ); }
107 /* The sleep() function is, perhaps, the most commonly used of all the
108 * process/thread suspension APIs; it provides support for specification
109 * of suspension periods ranging from 1 second to ~136 years. (However,
110 * POSIX recommends limiting the maximum period to 65535 seconds, to
111 * maintain portability to platforms with only 16-bit ints).
113 unsigned __cdecl __MINGW_NOTHROW sleep( unsigned );
115 #ifndef __NO_INLINE__
116 __CRT_INLINE __LIBIMPL__(( FUNCTION = sleep ))
117 unsigned sleep( unsigned period ){ return __mingw_sleep( period, 0 ); }
121 /* POSIX ftruncate() function.
123 * Microsoft's _chsize() function is incorrectly described, on MSDN,
124 * as a preferred replacement for the POSIX chsize() function. There
125 * never was any such POSIX function; the actual POSIX equivalent is
126 * the ftruncate() function.
128 int __cdecl ftruncate( int, off_t );
130 #ifndef __NO_INLINE__
131 __CRT_INLINE __JMPSTUB__(( FUNCTION = ftruncate, DLLENTRY = _chsize ))
132 int ftruncate( int __fd, off_t __length ){ return _chsize( __fd, __length ); }
137 #endif /* _POSIX_C_SOURCE */
139 #undef __UNISTD_H_SOURCED__
140 #endif /* !_UNISTD_H: $RCSfile$: end of file */