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Siddhesh Poyarekar 67e58f3941 Add framework for tunables 
The tunables framework allows us to uniformly manage and expose global
variables inside glibc as switches to users.  tunables/README has
instructions for glibc developers to add new tunables.

Tunables support can be enabled by passing the --enable-tunables
configure flag to the configure script.  This patch only adds a
framework and does not pose any limitations on how tunable values are
read from the user.  It also adds environment variables used in malloc
behaviour tweaking to the tunables framework as a PoC of the
compatibility interface.

	* manual/install.texi: Add --enable-tunables option.
	* INSTALL: Regenerate.
	* README.tunables: New file.
	* Makeconfig (CPPFLAGS): Define TOP_NAMESPACE.
	(before-compile): Generate dl-tunable-list.h early.
	* config.h.in: Add HAVE_TUNABLES.
	* config.make.in: Add have-tunables.
	* configure.ac: Add --enable-tunables option.
	* configure: Regenerate.
	* csu/init-first.c (__libc_init_first): Move
	__libc_init_secure earlier...
	* csu/init-first.c (LIBC_START_MAIN):... to here.
	Include dl-tunables.h, libc-internal.h.
	(LIBC_START_MAIN) [!SHARED]: Initialize tunables for static
	binaries.
	* elf/Makefile (dl-routines): Add dl-tunables.
	* elf/Versions (ld): Add __tunable_set_val to GLIBC_PRIVATE
	namespace.
	* elf/dl-support (_dl_nondynamic_init): Unset MALLOC_CHECK_
	only when !HAVE_TUNABLES.
	* elf/rtld.c (process_envvars): Likewise.
	* elf/dl-sysdep.c [HAVE_TUNABLES]: Include dl-tunables.h
	(_dl_sysdep_start): Call __tunables_init.
	* elf/dl-tunable-types.h: New file.
	* elf/dl-tunables.c: New file.
	* elf/dl-tunables.h: New file.
	* elf/dl-tunables.list: New file.
	* malloc/tst-malloc-usable-static.c: New test case.
	* malloc/Makefile (tests-static): Add it.
	* malloc/arena.c [HAVE_TUNABLES]: Include dl-tunables.h.
	Define TUNABLE_NAMESPACE.
	(DL_TUNABLE_CALLBACK (set_mallopt_check)): New function.
	(DL_TUNABLE_CALLBACK_FNDECL): New macro.  Use it to define
	callback functions.
	(ptmalloc_init): Set tunable values.
	* scripts/gen-tunables.awk: New file.
	* sysdeps/mach/hurd/dl-sysdep.c: Include dl-tunables.h.
	(_dl_sysdep_start): Call __tunables_init.
2016-12-31 23:49:24 +05:30
..
abi-versions.awk
abilist.awk Simplify the abilist format 2015-11-06 13:58:53 +01:00
begin-end-check.pl
build-many-glibcs.py Make build-many-glibcs.py flush stdout before execv. 2016-12-16 16:17:13 +00:00
check-c++-types.sh Add comments to check-c++-types.sh. 2016-12-27 14:26:05 -08:00
check-execstack.awk
check-installed-headers.sh Make _REENTRANT and _THREAD_SAFE aliases for _POSIX_C_SOURCE=199506L. 2016-12-08 15:45:33 -05:00
check-local-headers.sh mach: Add more allowed external headers 2016-08-21 03:24:55 +02:00
check-localplt.awk
check-textrel.awk
config-uname.sh
config.guess Update miscellaneous files from upstream sources. 2016-12-21 16:05:55 +00:00
config.sub Update miscellaneous files from upstream sources. 2016-12-21 16:05:55 +00:00
cpp Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
cross-test-ssh.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
documented.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
evaluate-test.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
firstversions.awk
gen-as-const.awk
gen-libc-abis Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
gen-libc-modules.awk
gen-posix-conf-vars.awk
gen-py-const.awk Add pretty printers for the NPTL lock types 2016-12-08 18:59:02 +05:30
gen-sorted.awk Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
gen-tunables.awk Add framework for tunables 2016-12-31 23:49:24 +05:30
install-sh Update miscellaneous files from upstream sources. 2016-12-21 16:05:55 +00:00
lib-names.awk
list-fixed-bugs.py Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
list-sources.sh
localplt.awk Support PLT and GOT references in local PIC check 2015-10-14 06:00:02 -07:00
merge-test-results.sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
mkinstalldirs Update miscellaneous files from upstream sources. 2016-12-21 16:05:55 +00:00
move-if-change Update miscellaneous files from upstream sources. 2016-12-21 16:05:55 +00:00
output-format.sed
pylint
pylintrc pylintrc: disable reports 2015-11-11 13:41:57 -05:00
rellns-sh Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
soversions.awk
sysd-rules.awk sysd-rules: Cut down the number of rtld-% pattern rules 2016-09-20 10:41:05 +02:00
test_printers_common.py scripts/test_printers_common.py: Log GDB error message 2016-12-23 15:13:28 +01:00
test_printers_exceptions.py Add pretty printers for the NPTL lock types 2016-12-08 18:59:02 +05:30
test-installation.pl Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
update-abilist.sh Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
update-copyrights Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
versionlist.awk Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
versions.awk Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00