unofficial mirror of guile-devel@gnu.org 
 help / color / mirror / Atom feed
* Portability bug with `nice' on Solaris
@ 2004-09-06 12:38 Matthias Koeppe
  2004-09-07  0:05 ` Kevin Ryde
  0 siblings, 1 reply; 2+ messages in thread
From: Matthias Koeppe @ 2004-09-06 12:38 UTC (permalink / raw)


I tried to use the Guile procedure `nice' on Solaris:

guile> (nice 11)
ERROR: In procedure nice:
ERROR: Error 0
ABORT: (system-error)

In libguile/posix.c (scm_nice):

  if (nice(SCM_INUM(incr)) != 0)
    SCM_SYSERROR;

This way of error detection does not work on Solaris.
>From the Solaris man page nice(2):

RETURN VALUES
     Upon successful completion,  nice()  returns  the  new  nice
     value  minus NZERO. Otherwise, -1 is returned, the process's
     nice value is not changed, and errno is set to indicate  the
     error.
USAGE
     Since -1 is a  permissible  return  value  in  a  successful
     situation,  an application wishing to check for error situa-
     tions should set errno to 0, then call  nice(),  and  if  it
     returns -1, check to see if errno is non-zero.

Since I don't know what the interface is like on other systems, I am
not sending a patch.

-- 
Matthias Koeppe -- http://www.math.uni-magdeburg.de/~mkoeppe


_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://lists.gnu.org/mailman/listinfo/guile-devel


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: Portability bug with `nice' on Solaris
  2004-09-06 12:38 Portability bug with `nice' on Solaris Matthias Koeppe
@ 2004-09-07  0:05 ` Kevin Ryde
  0 siblings, 0 replies; 2+ messages in thread
From: Kevin Ryde @ 2004-09-07  0:05 UTC (permalink / raw)
  Cc: guile-devel

Matthias Koeppe <mkoeppe@merkur.math.uni-magdeburg.de> writes:
>
>   if (nice(SCM_INUM(incr)) != 0)
>     SCM_SYSERROR;
>
> This way of error detection does not work on Solaris.

Thanks.  It's wrong everywhere else too :).  I made a change.


_______________________________________________
Guile-devel mailing list
Guile-devel@gnu.org
http://lists.gnu.org/mailman/listinfo/guile-devel


^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2004-09-07  0:05 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-09-06 12:38 Portability bug with `nice' on Solaris Matthias Koeppe
2004-09-07  0:05 ` Kevin Ryde

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).