On Jan 16 12:24, Jay Foad wrote: > I have an application that wants to use mmap() to read a file, but > only if it can guarantee that this will leave one or more zero bytes > after the end of the contents of the file in memory: > > if ((filesize & (pagesize - 1) != 0) > use_mmap(); > else > use_read(); > > How do I get the appropriate page size on cygwin? > > If I call getpagesize() it returns 64k, the "allocation granularity".
That's what you want. mmap always allocates in 64K chunks. > Internally cygwin has a getsystempagesize() (introduced here: > http://cygwin.com/ml/cygwin-cvs/2005-q4/msg00099.html) that returns > the appropriate page size, 4k, but that doesn't seem to be exposed to > applications. And it's not required. The system pagesize is really only used internally. Applications should rely on getpagesize(). Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
