clear buffer cache on Mac OS X

Question

Is there a way to programatically clear the buffer cache on the Mac, preferrably in C?

Basically, I\'m looking for the equivalent of the source of 10.5 (and greater)

Answer 1

Wouldn't you be interested in turning off the cache for a file instead? Depending on what you are trying to achieve, it could be an alternative. Good summary here.

UBC can be cleared by running 'purge' which allocates a lot of memory to force the cache to clear.

fcntl(fd, F_GLOBAL_NOCACHE, 1)  

can be used turn caching off for a particular file. This can be done in any process and the file can be closed after.