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* Add a new function dllockinit() for registering thread lockingjdp1999-12-271-0/+14
| | | | | | | | | | | | | | | | | | | 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.
* $Id$ -> $FreeBSD$peter1999-08-281-1/+1
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* Back out my change from 6 April PDT that added a new dlversion()jdp1999-04-221-15/+0
| | | | | | | 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.
* Add a new function dlversion() which returns the version number ofjdp1999-04-071-1/+16
| | | | | | the dynamic linker in the same form as __FreeBSD_version. This is mainly intended for checking the dynamic linker version during a make world.
* Add support for ELF.jdp1998-03-071-34/+106
| | | | Switch to ANSI-style function definitions.
* Move the trampolines for dlopen and related functions from crt0.ojdp1998-02-091-0/+96
into libc. This reduces the size of every dynamically linked executable by 248 bytes, and it reduces the size of static executables by a lesser amount. It also eliminates some global namespace pollution. With this change in place, the source for dlfcn.h should probably be moved to "/usr/src/include". I'll save that for another day. Compatibility note: Programs which use dlopen, if compiled on systems with this change, will not run on systems with a libc from prior to this change. Very few programs use dlopen, so I think that is OK.
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