Unit number limit?

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4 total messages Started by stever Fri, 23 May 1986 20:11

#365

Author: stever
Date: Fri, 23 May 1986 20:11

10 lines
670 bytes

Does anyone know a way to get around the limit of 20
unit numbers in UNIX 4.2 FORTRAN?

I understand that C allows 31 or so.

--thanks in advance

   Steve Rogers
 ....tektronix!tekgen!stever

Re: Unit number limit?

#374

Author: david
Date: Mon, 16 Jun 1986 09:46

15 lines
1130 bytes

>stever@tekgen
>Does anyone know a way to get around the limit of 20
>unit numbers in UNIX 4.2 FORTRAN?
>
>I understand that C allows 31 or so.

Nope, that is a function of the file descriptors you can have open in
UNIX 4.2: 0-19 (maybe 1-20 in f77, i dunno).

(flame me not - this is NOT some magic UNIX standard limit, , but it IS
a common implementation limit, and its for all the UNIXes I have
seen).

If you want lots of files open, use FILE pointers (is there a way to
get them from f77?  in C we use fopen() instead of open() ).

Re: Unit number limit?

#375

Author: david
Date: Mon, 16 Jun 1986 11:28

3 lines
762 bytes

Ooops!  I just checked the sources, and fopen() DOES still use
descriptors (it actually calls open()), so you can still only open 20
files on your vanilla 4.2 or sysV implementation.

Re: Unit number limit?

#384

Author: Daniel R. Levy
Date: Sat, 21 Jun 1986 01:10

18 lines
1482 bytes

In article <8300002@ztivax.UUCP>, david@ztivax.UUCP writes:
>Ooops!  I just checked the sources, and fopen() DOES still use
>descriptors (it actually calls open()), so you can still only open 20
>files on your vanilla 4.2 or sysV implementation.

I would HOPE that fopen() still uses descriptors (the OS provides no other way
to stuff input into a file, except maybe mucking with the device con-
taining the files [look ma, several files, one descriptor, system crash!] :-)).

No need to "check the sources" to know THAT!
-- 
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|        skokie, illinois        |
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