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Lib/ctypes.util.find_library() support for AIX
Similar approach as done for Darwin support by using separate files
but unlike Darwin - no extension such as ctypes.macholib.*
dlopen() is an interface to AIX initAndLoad() - primary documentation at:
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_61/com.ibm.aix.basetrf1/dlopen.htm
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_61/com.ibm.aix.basetrf1/load.htm
AIX supports two styles for dlopen(): svr4 (System V Release 4) which is common on posix
platforms, but also a BSD style - aka SVR3.
From AIX 5.3 Difference Addendum (December 2004)
2.9 SVR4 linking affinity
Nowadays, there are two major object file formats used by the operating systems:
XCOFF: The COFF enhanced by IBM and others. The original COFF (Common
Object File Format) was the base of SVR3 and BSD 4.2 systems.
ELF: Executable and Linking Format that was developed by AT&T and is a
base for SVR4 UNIX.
While the shared library content is identical on AIX - one is located as a filepath name
(svr4 style) and the other is located as a member of an archive (and the archive
is located as a filepath name).
The key difference arises when supporting multiple abi formats (i.e., 32 and 64 bit).
For svr4 either only one ABI is supported, or there are two directories, or there
are different file names. The most common solution for multiple ABI is multiple
directories.
For the XCOFF (aka AIX) style - one directory (one archive file) is sufficient
as multiple shared libraries can be in the archive - even sharing the same name.
In documentation the archive is also referred to as the "base" and the shared
library object is referred to as the "member".
For dlopen() on AIX (read initAndLoad()) the calls are similar.
Default activity occurs when no path information is provided. When path
information is provided dlopen() does not search any other directories.
For SVR4 - the shared library name is the name of the file expected: libFOO.so
For AIX - the shared library is expressed as base(member). The search is for the
base (e.g., libFOO.a) and once the base is found the shared library - identified by
member (e.g., libFOO.so, or shr.o) is located and loaded.
The mode bit RTLD_MEMBER tells initAndLoad() that it needs to use the AIX (SVR3)
naming style.
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executable)c_void_psizeof)PopenPIPEDEVNULL )maxsizec s fdd}t t| |dS )Nc sL | }g }z |r*|dt| qW n tk
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r( c C s\ g }t ddt d| gdttd}t|}|rF||t|f q"qFq"|j | |S )z
Parse the header of the loader section of executable and archives
This function calls /usr/bin/dump -H as a subprocess
and returns a list of (ld_header, ld_header_info) tuples.
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/usr/bin/dumpz-Xz-HT)Zuniversal_newlinesr stderr)
r AIX_ABIr r r# r& r( r closewait)fileZ ldr_headersr r! r r r get_ld_headersa s
r. c C s6 g }| D ](\}}d|kr| ||dd q|S )z
extract the shareable objects from ld_headers
character "[" is used to strip off the path information.
Note: the "[" and "]" characters that are part of dump -H output
are not removed here.
[)r& index)Z
ld_headersZsharedr" _r r r
get_sharedy s
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Must be only one match, otherwise result is None.
When there is a match, strip leading "[" and trailing "]"
z\[(z)\]Nc 3 s | ]}t |V qd S )N)r$ search).0r" exprr r s z get_one_match.. r )listfilterlengroup)r7 linesZmatchesr r6 r
get_one_match s
r? c C sJ t dkr d}t|| }|rF|S n&dD ] }tt|| }|r$| S q$dS )z
This routine provides historical aka legacy naming schemes started
in AIX4 shared library support for library members names.
e.g., in /usr/lib/libc.a the member name shr.o for 32-bit binary and
shr_64.o for 64-bit binary.
@ z shr4?_?64\.o)zshr.ozshr4.oN)r* r? r$ escape)membersr7 membernamer r r
get_legacy s
rE c C sf d| dd| dg}|D ]D}g }|D ]$}t ||}|r(||d q(|r t|d S q dS )a
Sort list of members and return highest numbered version - if it exists.
This function is called when an unversioned libFOO.a(libFOO.so) has
not been found.
Versioning for the member name is expected to follow
GNU LIBTOOL conventions: the highest version (x, then X.y, then X.Y.z)
* find [libFoo.so.X]
* find [libFoo.so.X.Y]
* find [libFoo.so.X.Y.Z]
Before the GNU convention became the standard scheme regardless of
binary size AIX packagers used GNU convention "as-is" for 32-bit
archive members but used an "distinguishing" name for 64-bit members.
This scheme inserted either 64 or _64 between libFOO and .so
- generally libFOO_64.so, but occasionally libFOO64.so
libz\.so\.[0-9]+[0-9.]*z_?64\.so\.[0-9]+[0-9.]*r .N)r$ r4 r& r= r )rD rB Zexprsr7 Zversionsr" mr r r get_version s
rI c C sb d| d}t ||}|r |S tdkr r" r r r r get_libpaths s
rO c C sp | D ]f}|dkrqd| d}t ||}t |rtt|}tt||}|dkrd||f S dS qdS )a
paths is a list of directories to search for an archive.
name is the abbreviated name given to find_library().
Process: search "paths" for archive, and if an archive is found
return the result of get_member().
If an archive is not found then return None
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