- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r270256:
Always check the limits of array index variables before using them.

Obtained from: DragonFlyBSD

MFC r266411:
Fix LD_LIBMAP.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Make the directory mapping functionality, which was previously only
available in 32-bit compatibility mode, unconditional.

Overhaul the man page, which had evolved more by accretion than by design.

Approved by: re (gjb)
MFC after: 3 weeks

rtld: Fix fd leak with parallel dlopen and fork/exec.

Rtld did not set FD_CLOEXEC on its internal file descriptors; therefore,
such a file descriptor may be passed to a process created by another thread
running in parallel to dlopen() or fdlopen().

No other threads are expected to be running during parsing of the hints
and libmap files but the file descriptors need not be passed to child
processes so add O_CLOEXEC there as well.

This change will break fdlopen() (as used by OpenPAM) on kernels without
F_DUPFD_CLOEXEC (added in July). Note that running new userland on old
kernels is not supported.

Reviewed by: kib

open the resolved path
fix debug message

Submitted by: John Marino <draco@marino.st>
Approved by: des (mentor)

Add two special directives to libmap.conf:
include <file>:
Parse the contents of file before continuing with the current file.
includedir <dir>:
Parse the contents of every file in dir that ends in .conf before continuing
with the current file.
Any file or directory encountered while processing include or includedir
directives will be parsed exactly once, even if it is encountered multiple
times.

Reviewed by: kib, des
Approved by: des (mentor)
MFC after: 1 month

Rtld on diet 3.

Stop using strerror(3) in rtld, which brings in msgcat and stdio.
Directly access sys_errlist array of errno messages with private
rtld_strerror() function.

Now,
$ size /libexec/ld-elf.so.1
text data bss dec hex filename
96983 2480 8744 108207 1a6af /libexec/ld-elf.so.1

Reviewed by: dim, kan
MFC after: 2 weeks

Rtld on diet part 2:

Do not use stdio for libmap.conf read. Directly map the file and
parse lines from the mappings.

Reviewed by: kan
MFC after: 3 weeks

Cosmetic nit:
- rename isspace1() macro to the more appropriate rtld_isspace().

Discussed with: kib

The libmap.conf initialization is performed before TLS is functional.
Since after r232498 the ctype macros require working access to
thread-local variables, rtld crashes when libmap.conf is present.

Use hand-made isspace1() macro which is enough to detect spaces in
libmap.conf.

Reported by: alc, lme, many on current@
Tested by: lme
Reviewed by: dim, kan
MFC after: 1 week

Fix a malloc overrun in 32-bit compat libmap lookup code.

Description from Dan:

Another handy libmap patch. Lets you do stuff like this:

LD_LIBMAP="libpthread.so.1=libthr.so.1" mythreadedapp

If you already have a program-specific override in libmap.conf, note
that you must use a program-specific override in LD_LIBMAP:

LD_LIBMAP="[mythreadedapp],libpthread.so.1=libthr.so.1" mythreadedapp

PR: bin/74471
Submitted by: Dan Nelson <dnelson AT allantgroup.com>
MFC after: 2 weeks

style(9)

Support basename and path based constrained matches.

eg:
[foo]
...

matches any executable 'foo'

[/usr/bin/foo/]
...

matches any executable under the directory /usr/bin/foo/

Exact matches continue to function as before.

PR: bin/66769
Submitted-by: Dan Nelson

Add initial support for compiling a special 32 bit version of
ld-elf.so.1 on 64 bit systems. Most of this involves using alternate
paths, environment variables and diagnostic messages.

The build glue is seperate.

Fix "warning: value computed is not used".

Found by: gcc 2.95.4 [FreeBSD]

Change libmap.c:lm_init() to return a status value; 0 for success
(libmap available) and 1 for failure. Assign this return to the
global 'libmap_disable' variable in rtld.c.

This totally prevents any libmap functions from being called after
lm_init() if no config file is present.

Include libmap.h for prototypes.

Provide function entry debugging messages.

Don't post-increment pointers inside a loop conditional.

While I'm here:
- Let lm_add() call strdup() on its own behalf.
- Use a temporary pointer when parsing constraints; only set the
constraint pointer on a totally successful match.

PR: bin/52783
Submitted by: David P. Reese Jr. <daver@gomerbud.com>
Approved by: re (rwatson)

Allow threading libraries to register their own locking
implementation in case default one provided by rtld is
not suitable.

Consolidate various identical MD lock implementation into
a single file using appropriate machine/atomic.h.

Approved by: re (scottl)

- Use xmalloc() and xstrdup() instead of malloc() and strdup().
- Add a global mapping if we have a successful constrained match.

Approved by: re

Remove redundant strlen checks, do not check the same
symbol twice.

Code cleanups and sanity checking for config file parser.

Dynamic object dependency mapping: libmap.

This is an optional feature, disabled by default.

This will be useful to people testing the various POSIX threading
libraries under -CURRENT but can easily serve other needs.