Il 09/05/2012 16:10, Kevin Wolf ha scritto: > > While SEEK_* is not guaranteed by POSIX to be 0/1/2, the values is so > > old that there may still exist programs that hard-code the values > > (similar to O_RDONLY/O_WRONLY/O_RDWR, though probably not any other O_* > > constant). It would be quite unwise to define them to something else. > > Even MS-DOS reused the values! > > > > AFAIK this is the only extension of lseek that's ever been added. It > > was done on Solaris first and then in Linux and the BSDs. It used 3/4 > > there too, see for example http://bugs.python.org/msg119551 (Solaris) > > and http://mail-index.netbsd.org/tech-kern/2011/08/17/msg011231.html > > (NetBSD). > > Why not simply #ifdef the whole code out and fall back to the current > "everything is allocated" behaviour when SEEK_DATA/HOLE aren't defined?
That would be okay too of course. When I wrote it Google Code existed still, so I must have taken the idiom from some place. Now it doesn't anymore, so I cannot check and it's okay to keep it safe. The code is a little bit uglier though. Paolo
