This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: NSIG wrong on Linux (amd64 and m68k, at least)


On 05/18/2012 08:15 PM, Thorsten Glaser wrote:
Hi,

I just noticed NSIG was 65 on Debian/m68k with (e)glibc, and looked,
and itâs the same on amd64.

hpa said that itâs probably an off-by-one error, that someone
confused [32;64[ with [32;64] and that there are 32 RT signals
on Linux/x86_64 but changing SIGRTMAX would be messy.

The current source code still has this possible off-by-one:
http://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/bits/signum.h;h=3e485f6ed40ac289738e1a187a4732b45e61246b;hb=HEAD
â line 68: #define _NSIG           65

bye,
//mirabilos, whoâs doing too much libc work recentlyâ

It was changed with this entry: 2003-03-31 Ulrich Drepper <drepper@redhat.com>

* sysdeps/unix/sysv/linux/alpha/bits/signum.h (_NSIG): Define to 65.
* sysdeps/unix/sysv/linux/hppa/bits/signum.h (_NSIG): Likewise.
* sysdeps/unix/sysv/linux/sparc/bits/signum.h (_NSIG): Likewise.
* sysdeps/unix/sysv/linux/bits/signum.h (_NSIG): Likewise.
(__SIGRTMAX): Adjust accordingly.



But where does this actually make a difference? We have:


#define _NSIG           65      /* Biggest signal number + 1
                                   (including real-time signals).  */

/* These are the hard limits of the kernel.  These values should not be
   used directly at user level.  */
#define __SIGRTMIN      32
#define __SIGRTMAX      (_NSIG - 1)

__SIGRTMAX is 64 and that's what counts, doesn't it?

Andreas
--
 Andreas Jaeger aj@{suse.com,opensuse.org} Twitter/Identica: jaegerandi
  SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 NÃrnberg, Germany
   GF: Jeff Hawn,Jennifer Guild,Felix ImendÃrffer,HRB16746 (AG NÃrnberg)
    GPG fingerprint = 93A3 365E CE47 B889 DF7F  FED1 389A 563C C272 A126


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]