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Posted to bugs@apr.apache.org by bu...@apache.org on 2023/01/20 00:26:58 UTC

[Bug 66435] New: APR_USE_SHMEM_MMAP_SHM fails on AIX

https://bz.apache.org/bugzilla/show_bug.cgi?id=66435

            Bug ID: 66435
           Summary: APR_USE_SHMEM_MMAP_SHM fails on AIX
           Product: APR
           Version: HEAD
          Hardware: PC
                OS: AIX
            Status: NEW
          Severity: normal
          Priority: P2
         Component: APR
          Assignee: bugs@apr.apache.org
          Reporter: covener@gmail.com
  Target Milestone: ---

The portable for for SHM shared memory is: shm_open, ftruncate, mmap.

In APR, apr_file_truncate is used for ftruncate, but it introduces an lseek()
that fails on at least AIX. 

AIX lseek manual:

       If the FileDescriptor parameter refers to a shared memory
object, the lseek subroutine fails with EINVAL.

...

       EINVAL
            The resulting offset would be greater than the maximum
offset allowed for the file or device associated with FileDescriptor.
The lseek subroutine was used with a file
            descriptor obtained from a call to the shm_open subroutine.

For now, the decision to prefer APR_USE_SHMEM_MMAP_SHM is overridden in
configure.in, but ideally it would work on AIX and somehow forego or ignore the
lseek error.

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[Bug 66435] APR_USE_SHMEM_MMAP_SHM fails on AIX

Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=66435

--- Comment #2 from Eric Covener <co...@gmail.com> ---
(In reply to Joe Orton from comment #1)
> It looks unnecessary to use an apr_file_t wrapper there at all, how about:
> https://github.com/apache/apr/pull/38 


looks simpler and maybe saves another unknown platform. Works for me w/ the
configure.in override removed.

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[Bug 66435] APR_USE_SHMEM_MMAP_SHM fails on AIX

Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=66435

--- Comment #1 from Joe Orton <jo...@redhat.com> ---
It looks unnecessary to use an apr_file_t wrapper there at all, how about:
https://github.com/apache/apr/pull/38 

?

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