Device names and/or numbers

[dukester]

Is there a list of device numbers somewhere? I've searched the manual with no luck. Something like:



Device Name    Device#

keyboard              0

crt                        1

etc

etc



As well, are:



STDIN

STDOUT

STDERR



defined?



Can I use STDIN in code to mean device#0? etc...

[cormullion]

If you create new file handles, numbering seems to start at 3. So that leaves 1 and 2 unaccounted for, as 0 is stdin/stdout. Dunno what 1 and 2 might do.



Perhaps you don't need to specify stdin/stdout, as they're the default until you choose another IO device.



Or you could do stuff like this:

Code Select Expand

(constant 'stdin 0 'stdout 0)
(device stdout)
(read-line stdin)


but it looks unnecessary to me.

[TedWalther]

If you create new file handles, numbering seems to start at 3. So that leaves 1 and 2 unaccounted for, as 0 is stdin/stdout. Dunno what 1 and 2 might do.



Perhaps you don't need to specify stdin/stdout, as they're the default until you choose another IO device.



Or you could do stuff like this:

Code Select Expand

(constant 'stdin 0 'stdout 0)
(device stdout)
(read-line stdin)


but it looks unnecessary to me.

1 is stdout. 2 is stderr. 0 is stdin.

[cormullion]

Makes sense!

[dukester]

If you create new file handles, numbering seems to start at 3. So that leaves 1 and 2 unaccounted for, as 0 is stdin/stdout. Dunno what 1 and 2 might do.



Perhaps you don't need to specify stdin/stdout, as they're the default until you choose another IO device.



Or you could do stuff like this:

Code Select Expand

(constant 'stdin 0 'stdout 0)
(device stdout)
(read-line stdin)


but it looks unnecessary to me.

1 is stdout. 2 is stderr. 0 is stdin.

Is this documented anywhere that I should have stumbled upon? Anyway, thanks for the heads-up!

[TedWalther]

If you create new file handles, numbering seems to start at 3. So that leaves 1 and 2 unaccounted for, as 0 is stdin/stdout. Dunno what 1 and 2 might do.



Perhaps you don't need to specify stdin/stdout, as they're the default until you choose another IO device.



Or you could do stuff like this:

Code Select Expand

(constant 'stdin 0 'stdout 0)
(device stdout)
(read-line stdin)


but it looks unnecessary to me.

1 is stdout. 2 is stderr. 0 is stdin.

Is this documented anywhere that I should have stumbled upon? Anyway, thanks for the heads-up!

It is a standard C/Unix thing.  You would come across it in the beginning of any discussion of file handles and file io.