Bug#165412: libc6: SIGRTMIN defined as -1 with libc 2.3.1, as 32 with 2.2.5

[Oskar Liljeblad <oskar@osk.mine.nu>]

Package: libc6
Version: 2.3.1-1
Severity: important

(I consider this important as it breaks all programs using this
signal entirely. I wouldn't blame you for lowing the severity
though...)

Ok, SIGRTMIN evaluates to -1 with libc6 2.3.1. With libc6 2.2.5
it would evaluate to 32.

SIGRTMIN is defined glibc-2.3.1/sysdeps/unix/sysv/{arch}/bits/signum.h
as:

  #define SIGRTMIN        (__libc_current_sigrtmin ())

The function __libc_current_sigrtmin is defined in
glibc-2.3.1/sysdeps/generic/allocrtsig.c like this:

  int
  __libc_current_sigrtmin (void)
  {
  #ifdef __SIGRTMIN
    if (!initialized)
      init ();
  #endif
    return current_rtmin;
  }

__SIGRTMIN is also defined in the signum.h file specified above,
like this:

  #define __SIGRTMIN      32

The init function is defined like this:

  static void
  init (void)
  {  
    if (!kernel_has_rtsig ())
      {
        current_rtmin = -1;
        current_rtmax = -1;
      }
    else
      {
        current_rtmin = __SIGRTMIN;
        current_rtmax = __SIGRTMAX;
      }
    initialized = 1;
  }

And kernel_has_rtsig is defined in two places, sysdeps/generic/testrtsig.h
and sysdeps/unix/sysv/linux/testrtsig.h. In the former, it is defined
like this:

  static int
  kernel_has_rtsig (void)
  {
    return 0;
  }

And in the latter:

  static int
  kernel_has_rtsig (void)
  {
  #if __ASSUME_REALTIME_SIGNALS
    return 1;
  #else
    struct utsname name;

    return uname (&name) == 0 && __strverscmp (name.release, "2.1.70") >= 0;
  #endif
  }

Maybe the problem is that when glibc-2.3.1/sysdeps/generic/allocrtsig.c
includes testrtsig.h, it does it like this:

  #include "testrtsig.h"

and the wrong file is used. I don't know...

Oskar Liljeblad (oskar@osk.mine.nu)

-- System Information
Debian Release: testing/unstable
Kernel Version: Linux oskar 2.4.19 #3 Fri Oct 4 17:30:42 CEST 2002 i686 unknown unknown GNU/Linux

Versions of the packages libc6 depends on:
ii  libdb1-compat  2.1.3-6        The Berkeley database routines [glibc 2.0/2.