> | One of the main DragonFly developers provided a patch, see > | http://leaf.dragonflybsd.org/mailarchive/users/2008-04/msg00044.html
Thanks. Matthew Dillon added the __sreadahead function just a few days ago. It is equivalent to gnulib's freadahead function, except that freadahead returns 0 if ((fp->_flags & __SWR) != 0 || fp->_r < 0). It looks like the DragonFly developers are recognizing the need for more API on FILE streams. The freadahead function is just one among ca. 10 such functions that gnulib wants to support. You find in http://www.haible.de/bruno/gnu/testdir-stdioext.tar.gz the documentation and implementation for all systems so far (from BSD systems to QNX), and a test suite. The documentation/specification is in the .h files. To port this package: - Unpack the package, configure it. Try "make" and fix the problems. - Run "make check" to see the test results. - The recommended order of porting (from easy to harder) is: fbufmode, fseterr, freadable, fwritable, freading, fwriting, fpending, fpurge, freadptr, freadseek, freadahead. If you want to have the complete liberty to shuffle around fields in the FILE struct, without risking crashes of programs that use gnulib, and you add such primitive functions to DragonFly, gnulib will use these primitives (provided they pass the testsuite). Bruno
