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Clarify/add LWIP_PROVIDE_ERRNO comments

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This commit is contained in:
goldsimon 2017-01-31 12:38:53 +01:00
parent 2685d742e8
commit 48d2243845
2 changed files with 6 additions and 3 deletions
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5
doc/sys_arch.txt
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@ -282,8 +282,9 @@ cc.h - Architecture environment, some compiler specific, some
definition of it, or include a file which defines it.
This file must either include a system-local <errno.h> which defines
the standard *nix error codes, or it should #define LWIP_PROVIDE_ERRNO
to make lwip/arch.h define the codes which are used throughout.
the standard *nix error codes (or define LWIP_ERRNO_INCLUDE to that file name),
or it should #define LWIP_PROVIDE_ERRNO to make lwip/arch.h define the codes
which are used throughout.
perf.h - Architecture specific performance measurement.

4
src/include/lwip/opt.h
View File

@ -1751,7 +1751,9 @@
#define LWIP_SOCKET_SET_ERRNO 1
#endif
/** LWIP_PROVIDE_ERRNO==1: Let lwIP provide ERRNO values.
/** LWIP_PROVIDE_ERRNO==1: Let lwIP provide ERRNO values and the 'errno' variable.
* If this is disabled, cc.h must either define 'errno', include <errno.h> or
* define LWIP_ERRNO_INCLUDE to <errno.h> or equivalent.
*/
#if !defined LWIP_PROVIDE_ERRNO || defined __DOXYGEN__
#define LWIP_PROVIDE_ERRNO 0