Commit Graph

20 Commits

Author SHA1 Message Date
Konstantin Belousov
2b0b4ee359 Implement support for RTLD_NODELETE flag for dlopen() and -z nodelete
static linker option. Do it by incrementing reference count on the loaded
object and its dependencies.

Reviewed by:	davidxu, kan
2009-03-30 08:47:28 +00:00
Alexander Kabaev
0eb88f2029 Implement ELF symbol versioning using GNU semantics. This code aims
to be compatible with symbol versioning support as implemented by
GNU libc and documented by http://people.redhat.com/~drepper/symbol-versioning
and LSB 3.0.

Implement dlvsym() function to allow lookups for a specific version of
a given symbol.
2005-12-18 19:43:33 +00:00
Alexander Kabaev
42d206e975 Implement dlinfo() function.
Introdice RTLD_SELF special handle and properly process it within
dlsym() and dlinfo() functions.

The intention is to improve our compatibility with Solaris and
to make a Java port easier.

Partially submitted by:	phantom
2003-02-13 17:47:44 +00:00
Mike Barcroft
24c502cbc7 Conditionalize some objects to match the functions that they are used
with.  Enable `restrict' type-qualifier.
2002-09-11 05:04:06 +00:00
Mike Barcroft
a30ec216db Fix some style bugs:
o Space used instead of a tab after `#define' and `typedef'.
o Sentences not ended with a period.
o Unaligned function names and other spacing issues.
2002-09-10 18:41:45 +00:00
Garrett Wollman
fda2301943 Since POSIX gives us plenary authority to define _t types, change
__dlfunc_t to dlfunc_t to match what I have proposed to the Austin
Group.  (This also makes it easier for applications to store these
values before they decide what to do with them, e.g., in a wrapper
function.)
2002-05-29 19:35:13 +00:00
Garrett Wollman
dc12134a80 Reorganize dlfcn.h slightly to separate out XSI and BSD interfaces.
Add new dlfunc() interface, which is a version of dlsym() with a
return type that can be cast to a function pointer without turning
your computer into a frog.

Reviewed by:	freebsd-standards
2002-05-29 16:25:43 +00:00
Warner Losh
bb28f3c29b Breath deep and take __P out of the system include files.
# This appears to not break X11, but I'm having problems compiling the
# glide part of the server with or without this patch, so I can't tell
# for sure.
2002-03-23 17:24:55 +00:00
Maxim Sobolev
c6de4ce791 Allow ldd(1) be used on shared libraries in addition to executables. 2002-02-04 10:33:48 +00:00
John Polstra
362a3eadeb Add a definition for RTLD_DEFAULT. 2000-09-19 04:24:50 +00:00
John Polstra
8a889bcb26 Add a #define for RTLD_LOCAL as required by the Single Unix
Specification.
2000-01-29 01:53:35 +00:00
John Polstra
4fba53a082 Remove the comment warning that the dllockinit() interface might
change.  I have decided that the interface is general enough to
last.
2000-01-09 20:57:21 +00:00
John Polstra
3600eb76c6 Work around an assert failure in the dynamic linker's default thread
locking functions.  If an application loads a shared object with
dlopen() and the shared object has an init function which requires
lazy binding, then _rtld_bind is called when the thread is already
inside the dynamic linker.  This leads to a recursive acquisition
of the lock, which I was not expecting -- hence the assert failure.

This work-around makes the default locking functions handle recursive
locking.  It is NOT the correct fix -- that should be implemented
at the generic locking level rather than in the default locking
functions.  I will implement the correct fix in a future commit.

Since the dllockinit() interface will likely need to change, warn
about that in both the man page and the header file.
1999-12-28 04:38:17 +00:00
John Polstra
d3980376e8 Add a new function dllockinit() for registering thread locking
functions to be used by the dynamic linker.  This can be called by
threads packages at start-up time.  I will add the call to libc_r
soon.

Also add a default locking method that is used up until dllockinit()
is called.  The default method works by blocking SIGVTALRM, SIGPROF,
and SIGALRM in critical sections.  It is based on the observation
that most user-space threads packages implement thread preemption
with one of these signals (usually SIGVTALRM).

The dynamic linker has never been reentrant, but it became less
reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c".
Starting with that revision, multiple threads each doing lazy
binding could interfere with each other.  The usual symptom was
that a symbol was falsely reported as undefined at start-up time.
It was rare but not unseen.  This commit fixes it.
1999-12-27 04:44:04 +00:00
John Polstra
30f6d5b508 Add definition for RTLD_GLOBAL, which is soon to be supported. 1999-08-30 00:50:12 +00:00
Peter Wemm
a4add9a9b1 $Id$ -> $FreeBSD$ 1999-08-27 23:45:13 +00:00
John Polstra
6d30b16752 Back out my change from 6 April PDT that added a new dlversion()
function.  It was an ill-considered feature.  It didn't solve the
problem I wanted it to solve.   And it added Yet Another Version
Number that would have to be maintained at every release point.
I'm nuking it now before anybody grows too fond of it.
1999-04-22 01:54:38 +00:00
John Polstra
14f5fa0596 Add a new function dlversion() which returns the version number of
the dynamic linker in the same form as __FreeBSD_version.  This is
mainly intended for checking the dynamic linker version during a make
world.
1999-04-07 02:43:11 +00:00
John Polstra
c1effe8a45 Replace bogus "@(#)err.h 8.1 (Berkeley) 6/2/93" with RCS Id keyword.
Somebody must have blindly copied the leader comment when they
created this file.
1998-02-11 05:19:10 +00:00
John Polstra
0fbd9e9828 Remove the include of <dlfcn.h> from crt0.c; it is not needed now
that the dl* trampolines have been moved into libc.

Move dlfcn.h from src/lib/csu/i386 into src/include.  Nothing in
src/lib/csu/i386 uses it any more.
1998-02-11 04:57:25 +00:00