os-aix/8973: signals.c sig_mask fix for AIX assumes 32-bit mode

[David Edelsohn <dj...@watson.ibm.com>]

>Number:         8973
>Category:       os-aix
>Synopsis:       signals.c sig_mask fix for AIX assumes 32-bit mode
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Thu Dec 06 19:30:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     dje@watson.ibm.com
>Release:        2.0.28
>Organization:
apache
>Environment:
AIX 5.1.0.0, GCC 3.0.2
>Description:
srclib/apr/threadproc/signals.c provides a workaround for sigwait() on AIX by
explicitly masking sig_mask.hisigs.  That structure member only is present in
32-bit mode, so signals.c fails to compile in 64-bit mode.

One can test for 64-bit mode on AIX by testing the __64BIT__ macro.  I do not
know if 64-bit AIX sigwait() has the same problem and if the same bit needs to
be masked.  I naively modified the code to mask the equivalent high-order bit
in the 64-bit structure to allow signals.c to compile, which allowed httpd to
build and run.
signals.c to compile.
>How-To-Repeat:
Compile srclib/apr/threadproc/signals.c in 64-bit mode.
>Fix:
*** signals.c.orig      Thu Dec  6 22:07:43 2001
--- signals.c   Thu Dec  6 22:07:42 2001
*************** APR_DECLARE(apr_status_t) apr_signal_thr
*** 301,307 ****
--- 301,311 ----
       * off manually.
       */
  #ifdef _AIX
+ #ifdef __64BIT__
+     sig_mask.ss_set[3] &= 0x7FFFFFFFFFFFFFFFull;
+ #else
      sig_mask.hisigs &= 0x7FFFFFFF;
+ #endif
  #endif
  
      while (1) {
>Release-Note:
>Audit-Trail:
>Unformatted:
 [In order for any reply to be added to the PR database, you need]
 [to include <ap...@Apache.Org> in the Cc line and make sure the]
 [subject line starts with the report component and number, with ]
 [or without any 'Re:' prefixes (such as "general/1098:" or      ]
 ["Re: general/1098:").  If the subject doesn't match this       ]
 [pattern, your message will be misfiled and ignored.  The       ]
 ["apbugs" address is not added to the Cc line of messages from  ]
 [the database automatically because of the potential for mail   ]
 [loops.  If you do not include this Cc, your reply may be ig-   ]
 [nored unless you are responding to an explicit request from a  ]
 [developer.  Reply only with text; DO NOT SEND ATTACHMENTS!     ]