Commit Graph

33 Commits

Author SHA1 Message Date
Doug Rabson
eace1a8ad9 Use the runpath of the main program for locating libraries loaded by
dlopen().

Reviewed by: jdp
1998-11-27 21:19:52 +00:00
John Polstra
1280c211e2 Fix a bug in dlclose that broke the apache13 port. The list of
loaded objects wasn't being maintained properly.
1998-10-13 03:31:59 +00:00
John Polstra
b19042b569 Make LD_PRELOAD work for ELF. 1998-09-22 02:09:56 +00:00
John Polstra
29218d94d3 Fix a bug that showed up when debugging dynamically linked programs.
References from GDB to "printf" and various other functions would
find the versions in the dynamic linker itself, rather than the
versions in the program's libc.  This fix moves the GDB link map
entry for the dynamic linker to the end of the search list, where
its symbols will be found only if they are not found anywhere else.
It was suggested by Doug Rabson, though I implemented it a little
differently.

I personally would prefer to leave the dynamic linker's entry out
of the GDB search list altogether.  But Doug argues that it is
handy there for such things as setting breakpoints on dlopen().
So it stays for now, at least.

Note, if we ever integrate the dynamic linker with libc (which has
several important benefits to recommend it), this whole problem
goes away.
1998-09-16 02:54:08 +00:00
John Polstra
4e25d42aee Make the pathname pointed to by the Obj_Entry structure for the
dynamic linker itself dynamically allocated.  All of them are
supposed to be dynamically allocated, but we cheated before.  It
made gdb unhappy under some circumstances.
1998-09-15 21:07:52 +00:00
Doug Rabson
75fd258d75 Update to the binutils-2.9.1 PLT format. 1998-09-11 18:31:55 +00:00
Doug Rabson
732b5469fe Add the r_addend of the relocation when processing GLOB_DAT relocations. 1998-09-11 18:30:55 +00:00
Doug Rabson
5e618ef5c8 Fix a cut&paste error which prevented LD_BIND_NOW from working. 1998-09-08 09:47:35 +00:00
John Polstra
a565ca5920 Implement ldconfig functionality for ELF. The hints are stored in
a different file than the a.out hints, namely, "/var/run/ld-elf.so.hints".
These hints consist only of the directory search path.  There is
no hash table as in the a.out hints, because ELF doesn't have to
search for the file with the highest minor version number.  (It
doesn't have minor version numbers at all.)

A single run of ldconfig updates either the a.out hints or the ELF
hints, but not both.  The set of hints to process is selected in
the usual way, via /etc/objformat, or ${OBJFORMAT}, or the "-aout"
or "-elf" command line option.  The rationale is that you probably
want to search different directories for ELF than for a.out.

"ldconfig -r" is faked up to produce output like we are used to,
except that for ELF there are no minor version numbers.  This should
enable "ldconfig -r" to be used for checking LIB_DEPENDS in ports
even for ELF.

I implemented the ELF functionality in a new source file, with an
eye toward eliminating the a.out code entirely at some point in
the future.
1998-09-05 03:31:00 +00:00
Doug Rabson
13575fc46f Add alpha support.
Submitted by: John Birrell <jb@cimlogic.com.au> (with extra hacks by me)
Obtained from: Probably NetBSD
1998-09-04 19:03:57 +00:00
John Polstra
63fac2b9ef Suppress duplicate entries in ldd output. 1998-09-02 02:51:12 +00:00
John Polstra
93df8d681b Style fixes. If it seems like a lot of lines of changes, it's
because I moved some functions.  Mr. Tidy likes them to be in
alphabetical order.
1998-09-02 02:00:20 +00:00
John Polstra
cefbc49679 Handle dlsym(NULL, ...) properly, by searching in the caller's
shared object.  Note, this searches _only_ that object, and not its
needed objects, in accordance with the documentation.

Also fix dlopen(NULL, ...) so that the executable's needed objects
are searched as well as the executable itself.
1998-09-02 01:09:34 +00:00
John Birrell
1eab1be09e Update this header to use the revamped elf headers which select Elf32
or Elf64 based on the inclusion of the machine dependent header.

I've left the addition of the extra fields to handle the relocation
structures with addend for a separate commit after jdp has had a chance
to review what I've done. The current change is needed to compile
csu/alpha/crt1.c
1998-08-21 03:29:40 +00:00
John Polstra
9d5aee94a0 Add "-C" to INSTALLFLAGS to install atomically. An elf->elf
installworld dies at this point otherwise, leaving the system
without a dynamic linker.
1998-08-17 04:59:15 +00:00
Doug Rabson
46066cf144 Add support for ldd. 1998-05-01 08:39:27 +00:00
Doug Rabson
2001f720ce Add GDB support. The method and some of the code came from NetBSD's elf
runtime linker.
1998-04-30 07:48:02 +00:00
John Polstra
3124c3e093 Import the ELF dynamic linker. This is the ElfKit version with
quite a few enhancements and bug fixes.  There are still some known
deficiencies, but it should be adequate to get us started with ELF.

Submitted by:	John Polstra <jdp@polstra.com>
1998-03-07 19:24:35 +00:00
Wolfram Schneider
f6b31571f6 spelling corrections.
PR: docs/4450
Submitted by: josh@quick.net
1997-09-13 16:01:53 +00:00
Masafumi Max NAKANE
d5fb0dffb4 Typo fix.
PR:		3693
Submitted by:	Kazuo Horikawa <k-horik@yk.rim.or.jp>
1997-05-27 13:46:40 +00:00
Peter Wemm
fce15c9ab3 Revert $FreeBSD$ to $Id$ 1997-02-22 15:48:31 +00:00
John Polstra
ac6c268b3d Pay attention to the environment variable "LD_IGNORE_MISSING_OBJECTS".
If it is set to a nonempty string, then simply skip any missing
shared libraries.  This came up in a discussion long ago as a
potentially useful feature at sysinstall time.  For example, an
X11 utility could be used without the X libraries being present,
provided the utility had a mode in which no X functions were actually
called.
1997-01-17 20:22:18 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
Wolfram Schneider
af20215665 Sort cross references. 1997-01-13 00:25:51 +00:00
John Polstra
aeea55e459 Correct typos and spelling errors. 1997-01-12 00:19:14 +00:00
John Polstra
0db65949ae Add support for the LD_BIND_NOW environment variable. If it is set to a
nonempty string, then function calls are relocated at program start-up
rather than lazily.  This variable is standard on Sun and SVR4 systems.

The dlopen() function now supports both lazy and immediate binding, as
determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or
2 (RTLD_NOW).  I will add defines of these symbols to <dlfcn.h> as soon
as I've done a little more checking to make sure they won't cause
collisions or bootstrapping problems that would break "make world".

The "LD_*" environment variables which alter dynamic linker behavior are
now treated as unset if they are set to the empty string.  This agrees
with the standard SVR4 conventions for the dynamic linker.

Add a work-around for programs compiled with certain buggy versions of
crt0.o.  The buggy versions failed to set the "crt_ldso" member of the
interface structure.  This caused certain error messages from the
dynamic linker to begin with "(null)" instead of the pathname of the
dynamic linker.
1997-01-12 00:16:36 +00:00
Steven Wallace
43d7fd0390 Fix spelling error in manpage. 1996-12-26 21:51:09 +00:00
John Polstra
16804804df Fix two minor typos in the manual page. 1996-10-18 04:49:43 +00:00
Peter Wemm
5584286a91 Update to handle new version ld.so.hints and info in executable for
configurable fallback search paths, as well as new crt interface version.

Also:
 - even faster getenv(), get all environment variable settings in a single
   pass.
 - ldd printf-like format specifications
 - minor code cleanups, one vsprintf -> vsnprintf (harmless)

The library search sequence is a little more complete now. Before,
it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read
the hints file, then read /usr/lib (again by scanning thr directory).  It
would then fail if there was no "found" library.

Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses
a longer fallback path.  The -R path is fetched from the executable if
specified at build time, the ldconfig path is appended, and /usr/lib is
appended to that. Duplicates are suppressed.  This means that simply
placing a new library in /usr/local/lib will work (the same as it did in
/usr/lib) without needing ldconfig -m.  It will find it quicker if the
ldconfig is run though.

Similar changes have been made to the NetBSD ld.so, but ours is rather
different now due to John Polstra's speedups and fixes from a while back.

The ldd printf-like format support came direct from NetBSD.

Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
Wolfram Schneider
e0e5145ce6 add missing comma(s) in .Xr macros 1996-09-23 22:24:39 +00:00
John Polstra
dd2b076850 Implement support for LD_PRELOAD in the dynamic linker. Remove
descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual
page, since they are not supported.

Submitted by:	Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
Nate Williams
c68c38c86b This is a FreeBSD manpage, not a NetBSD manpage. :) 1995-10-05 05:16:52 +00:00
Joerg Wunsch
19d57e6d9d Import Paul Kranenburg's man page for ld.so (aka. rtld).
Obtained from:	NetBSD
1995-08-26 13:17:39 +00:00