NGROUPS_MAX in linux 2.6.3+
Ulrich Drepper
drepper@redhat.com
Wed Feb 25 08:15:00 GMT 2004
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Andreas Jaeger wrote:
> The problem I see with your patch, is that there seems to be no
> fallback for the case where you compile this with kernel headers that
> define KERN_NGROUPS_MAX but do run it on an older kernel. Check how
> we do this with kernel-features.h,
That's not the only problem.
More critical is that, according to Arjan, numeric sysctl() calls are
deprecated. There isn't yet a replacement which takes strings so you'll
have to use /proc/sys/kernel/....
So, rewrite the code to use open+read+strtol (don't even thing about
fopen+fscanf). Replace the default case with a simple break, move the
posix_sysconf call to the end of the function, and return from the
special NGROUPS handling only if reading the file was successful.
Otherwise fall through to the posix_sysconf call. Oh, and since you'll
use /proc there is no need for any #ifdef.
- --
⧠Ulrich Drepper ⧠Red Hat, Inc. ⧠444 Castro St ⧠Mountain View, CA â
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (GNU/Linux)
iD8DBQFAPFl/2ijCOnn/RHQRApK6AJ0dR9opUQtxk5A7uDCFT27nTHWgGACfYx2z
7vDTbAGM4Tdtke34v/LPWzs=
=vqDu
-----END PGP SIGNATURE-----
More information about the Libc-alpha
mailing list