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posix: features: correction on posix2 feature test macros

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The _POSIX2_VERSION feature test macro should be either -1 or
left undefined on systems that do not have a POSIX-conformant
shell or utilities. Otherwise, it should be defined to the
value _POSIX_VERSION.

Since Zephyr has neither a conformant shell nor utilities, leave
_POSIX2_VERSION undefined.

Similarly, the _POSIX2_C_DEV macro should be either -1 or left
undefined if the implementation does not support the c99, lex,
and yacc shell utilities. Otherwise it should be defined to the
value _POSIX_VERSION.

Although _POSIX2_C_BIND appears to be related to the _POSIX2
family of feature test macros, all it conveys is that the
implementation supports POSIX C Language bindings, which is
always the case if the implementation uses the C programming
language, even if the implementation does not support a
conformant shell and utilities. _POSIX2_C_BIND should be
defined to the same value as _POSIX_VERSION.

Define _POSIX2_C_BIND as _POSIX_VERSION since Zephyr's
implementation of the POSIX API supports C language bindings.

The information above comes from the "unistd.h" page in the
spec and also through word search of the term "C-Language
Development Utilities".

https://pubs.opengroup.org/onlinepubs/9699919799/index.html

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
This commit is contained in:
Chris Friedt 2025-01-07 10:37:33 -05:00 • committed by Benjamin Cabé
commit d33b5c907f
2 changed files with 7 additions and 5 deletions
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6
include/zephyr/posix/posix_features.h
View file

@ -201,9 +201,9 @@
/*
* POSIX2 Options
*/
#define _POSIX2_VERSION _POSIX_VERSION
#define _POSIX2_C_BIND _POSIX2_VERSION
#define _POSIX2_C_DEV _POSIX2_VERSION
/* #define _POSIX2_VERSION (-1) */
#define _POSIX2_C_BIND _POSIX_VERSION
/* #define _POSIX2_C_DEV (-1) */
/* #define _POSIX2_CHAR_TERM (-1L) */
/* #define _POSIX2_FORT_DEV (-1L) */
/* #define _POSIX2_FORT_RUN (-1L) */

6
include/zephyr/posix/sys/sysconf.h
View file

@ -233,7 +233,8 @@ enum {
#define __z_posix_sysconf_SC_BC_SCALE_MAX _POSIX2_BC_SCALE_MAX
#define __z_posix_sysconf_SC_BC_STRING_MAX _POSIX2_BC_STRING_MAX
#define __z_posix_sysconf_SC_2_C_BIND _POSIX2_C_BIND
#define __z_posix_sysconf_SC_2_C_DEV _POSIX2_C_DEV
#define __z_posix_sysconf_SC_2_C_DEV \
COND_CODE_1(_POSIX2_C_DEV > 0, (_POSIX2_C_DEV), (-1))
#define __z_posix_sysconf_SC_2_CHAR_TERM (-1L)
#define __z_posix_sysconf_SC_COLL_WEIGHTS_MAX _POSIX2_COLL_WEIGHTS_MAX
#define __z_posix_sysconf_SC_DELAYTIMER_MAX _POSIX_DELAYTIMER_MAX
@ -250,7 +251,8 @@ enum {
#define __z_posix_sysconf_SC_2_PBS_TRACK (-1L)
#define __z_posix_sysconf_SC_2_SW_DEV (-1L)
#define __z_posix_sysconf_SC_2_UPE (-1L)
#define __z_posix_sysconf_SC_2_VERSION _POSIX2_VERSION
#define __z_posix_sysconf_SC_2_VERSION \
COND_CODE_1(_POSIX2_VERSION > 0, (_POSIX2_VERSION), (-1))
#define __z_posix_sysconf_SC_XOPEN_CRYPT (-1L)
#define __z_posix_sysconf_SC_XOPEN_ENH_I18N (-1L)
#define __z_posix_sysconf_SC_XOPEN_REALTIME (-1L)