On Wed, Feb 24, 2010 at 07:27:27PM -0700, Theo de Raadt wrote: > > That said, sys/types.h is most likely not what is needed to > > make sys/mman.h self-contained, but that's a completely > > separate issue. > > By the way, where is it written that sys/mman.h has to be > self-contained? > > I bet it is written exactly the other way around.
http://www.opengroup.org/onlinepubs/9699919799/ E.g. sys/mman.h is supposed to define size_t. The easiest approach for that is to include sys/types.h, but adding e.g. #ifndef _SIZE_T_DEFINED_ #define _SIZE_T_DEFINED_ typedef __size_t size_t; #endif is acceptable (and preferable). The goal beside the standalone requirement is to enforce minimal pollution of the application namespace. If a source file needs a symbol from foo.h, it should have to include it, but it shouldn't have to know how the headers work internally. Joerg
