1 | /* $NetBSD: featuretest.h,v 1.10 2013/04/26 18:29:06 christos Exp $ */ |
2 | |
3 | /* |
4 | * Written by Klaus Klein <kleink@NetBSD.org>, February 2, 1998. |
5 | * Public domain. |
6 | * |
7 | * NOTE: Do not protect this header against multiple inclusion. Doing |
8 | * so can have subtle side-effects due to header file inclusion order |
9 | * and testing of e.g. _POSIX_SOURCE vs. _POSIX_C_SOURCE. Instead, |
10 | * protect each CPP macro that we want to supply. |
11 | */ |
12 | |
13 | /* |
14 | * Feature-test macros are defined by several standards, and allow an |
15 | * application to specify what symbols they want the system headers to |
16 | * expose, and hence what standard they want them to conform to. |
17 | * There are two classes of feature-test macros. The first class |
18 | * specify complete standards, and if one of these is defined, header |
19 | * files will try to conform to the relevant standard. They are: |
20 | * |
21 | * ANSI macros: |
22 | * _ANSI_SOURCE ANSI C89 |
23 | * |
24 | * POSIX macros: |
25 | * _POSIX_SOURCE == 1 IEEE Std 1003.1 (version?) |
26 | * _POSIX_C_SOURCE == 1 IEEE Std 1003.1-1990 |
27 | * _POSIX_C_SOURCE == 2 IEEE Std 1003.2-1992 |
28 | * _POSIX_C_SOURCE == 199309L IEEE Std 1003.1b-1993 |
29 | * _POSIX_C_SOURCE == 199506L ISO/IEC 9945-1:1996 |
30 | * _POSIX_C_SOURCE == 200112L IEEE Std 1003.1-2001 |
31 | * _POSIX_C_SOURCE == 200809L IEEE Std 1003.1-2008 |
32 | * |
33 | * X/Open macros: |
34 | * _XOPEN_SOURCE System Interfaces and Headers, Issue 4, Ver 2 |
35 | * _XOPEN_SOURCE_EXTENDED == 1 XSH4.2 UNIX extensions |
36 | * _XOPEN_SOURCE == 500 System Interfaces and Headers, Issue 5 |
37 | * _XOPEN_SOURCE == 520 Networking Services (XNS), Issue 5.2 |
38 | * _XOPEN_SOURCE == 600 IEEE Std 1003.1-2001, XSI option |
39 | * _XOPEN_SOURCE == 700 IEEE Std 1003.1-2008, XSI option |
40 | * |
41 | * NetBSD macros: |
42 | * _NETBSD_SOURCE == 1 Make all NetBSD features available. |
43 | * |
44 | * If more than one of these "major" feature-test macros is defined, |
45 | * then the set of facilities provided (and namespace used) is the |
46 | * union of that specified by the relevant standards, and in case of |
47 | * conflict, the earlier standard in the above list has precedence (so |
48 | * if both _POSIX_C_SOURCE and _NETBSD_SOURCE are defined, the version |
49 | * of rename() that's used is the POSIX one). If none of the "major" |
50 | * feature-test macros is defined, _NETBSD_SOURCE is assumed. |
51 | * |
52 | * There are also "minor" feature-test macros, which enable extra |
53 | * functionality in addition to some base standard. They should be |
54 | * defined along with one of the "major" macros. The "minor" macros |
55 | * are: |
56 | * |
57 | * _REENTRANT |
58 | * _ISOC99_SOURCE |
59 | * _ISOC11_SOURCE |
60 | * _LARGEFILE_SOURCE Large File Support |
61 | * <http://ftp.sas.com/standards/large.file/x_open.20Mar96.html> |
62 | */ |
63 | |
64 | #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) |
65 | #define _POSIX_C_SOURCE 1L |
66 | #endif |
67 | |
68 | #if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \ |
69 | !defined(_XOPEN_SOURCE) && !defined(_NETBSD_SOURCE) |
70 | #define _NETBSD_SOURCE 1 |
71 | #endif |
72 | |
73 | #if ((_POSIX_C_SOURCE - 0) >= 199506L || (_XOPEN_SOURCE - 0) >= 500) && \ |
74 | !defined(_REENTRANT) |
75 | #define _REENTRANT |
76 | #endif |
77 | |