On Mon, 6 Jan 2014 05:32:58 +0100 Manfred Lotz <manfred.l...@arcor.de> wrote:
> On Sun, 5 Jan 2014 14:37:08 -0700 > Matthew Flatt <mfl...@cs.utah.edu> wrote: > > > At Sun, 5 Jan 2014 21:45:59 +0100, Manfred Lotz wrote: > > > This might be a stupid question. But how do I find out in Racket > > > if a file is a socket or a haracter resp. block device file. > > > > I don't think any functions currently provide that information. (The > > only related function that comes to mind is `terminal-port?`, and > > even that function works on ports instead of files.) > > > > Oh, that's really bad. > > When testing my file duplicate finder one of my test cases is to > create a socket, a pipe, a character device and a block device file. > My racket program gets a > system error: No such device or address; errno=6 > when dealing with a socket. Or if it is a pipe then it waits for > input. > > I think functionality should be added in Racket. > > What's about something like this? > socket-exists > pipe-exists > block-device-exists > character-device-exists > > As all those files seem to have a size 0 I just will omit doing a checksum for a size 0. This should solve it for me. Nevertheless, in the long run it seems a good idea to add those functions. -- Manfred ____________________ Racket Users list: http://lists.racket-lang.org/users
