Consolidate Linux setrlimit and getrlimit implementation

This patch consolidates all Linux setrlimit and getrlimit on the default
sysdeps/unix/sysv/linux/{set,get}rlimit{64}.c.  It contains two exceptions:

  1. mips32 and mips64n32 which requires a versioned symbol for GLIBC 2.19
     and higher due a broken RLIM64_INFINITY constant.
  2. sparc32 does not define a compat symbol for getrlimit64 for old 2GB
     limit. I am not sure if it is required, but a RLIM_INFINITY fix [1]
     change its definition without adding a compat symbol.  This patch does
     not aim to address this possible issue, it follow current symbol
     export.

The default implementation uses prlimit64 for 64 bit rlim_t ({set,get}rlimit64)
and if it fails with ENOSYS it fall back to {get,set}rlimit syscall.  This
code path is only used on kernel older than 2.6.36 (basically now only x86)
and I avoid to user __ASSUME_PRLIMTI64 to simplify the implementation.  Once
x86 moves to be on par with other architectures regarding minimum kernel
supported we can get rid of using old syscalls and default path.

A new type size define is added, __RLIM_T_MATCHES_RLIM64_T, where is set as
default for 64 bits ports.  This allows the default implementation to avoid
{get,set}rlimit building and alias {get,set}rlimit64 to {get,set}rlimit.

Checked on x86_64, i386, armhf, aarch64, and powerpc64le.  I also did a
sanity build plus check-abi on all other supported architectures.

[1] Commit 9c96ff23858b0759e12ad69e3c4599931c90bee8

	Adhemerval Zanella  <adhemerval.zanella@linaro.org>
	Yury Norov  <ynorov@caviumnetworks.com>

	* bits/typesizes.h (__RLIM_T_MATCHES_RLIM64_T): define.
	* sysdeps/unix/sysv/linux/alpha/bits/typesizes.h
	(__RLIM_T_MATCHES_RLIM64_T): Likewise.
	* sysdeps/unix/sysv/linux/generic/bits/typesizes.h
	(__RLIM_T_MATCHES_RLIM64_T): Likewise.
	* sysdeps/unix/sysv/linux/s390/bits/typesizes.h [__s390x__]
	(__RLIM_T_MATCHES_RLIM64_T): Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/typesizes.h
	[__arch64__ || __sparcv9] (__RLIM_T_MATCHES_RLIM64_T): Likewise.
	* sysdeps/unix/sysv/linux/x86/bits/typesizes.h [__86_64__]
	(__RLIM_T_MATCHES_RLIM64_T): Likewise.
	* sysdeps/unix/sysv/linux/arm/Makefile [$(subdir) = resource]
	(sysdep_routines): Remove oldgetrlimit64.
	* sysdeps/unix/sysv/linux/i386/Makefile [$(subdir) = resource]
	(sysdep_routines): Likewise.
	* sysdeps/unix/sysv/linux/m68k/Makefile [$(subdir) = resource]
	(sysdep_routines): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/Makefile
	[$(subdir) = resource] (sysdep_routines): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/Makefile
	[$(subdir) = resource] (sysdep_routines): Likewise.
	* sysdeps/unix/sysv/linux/arm/getrlimit64.c: Remove file.
	* sysdeps/unix/sysv/linux/arm/oldgetrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/hppa/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/oldgetrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/oldgetrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/oldgetrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/oldgetrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/sh/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/setrlimit64.c: Likewise.
	* sysdeps/sysv/linux/generic/wordsize-32/syscalls.list: Remove
	setrlimit and getrlimit.
	* sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/i386/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/getrlimit.c: New file.
	* sysdeps/unix/sysv/linux/sparc/getrlimit64.c: Likewise.
	* sysdeps/unix/sysv/linux/setrlimit.c: Likewise.
	* sysdeps/unix/sysv/linux/getrlimit64.c (__getrlimit64): Handle
	__RLIM_T_MATCHES_RLIM64_T and add alias if defined.
	(__old_getrlimit64): Add compatibility symbol.
	* sysdeps/unix/sysv/linux/setrlimit64.c (__setrlimit): Likewise.

4 files changed, 0 insertions, 88 deletions

diff --git a/sysdeps/unix/sysv/linux/i386/Makefile b/sysdeps/unix/sysv/linux/i386/Makefile
index 2596cdfbb2..9609752256 100644
--- a/sysdeps/unix/sysv/linux/i386/Makefile
+++ b/sysdeps/unix/sysv/linux/i386/Makefile
@@ -49,10 +49,6 @@ libpthread-sysdep_routines += libc-do-syscall
 libpthread-shared-only-routines += libc-do-syscall
 endif
 
-ifeq ($(subdir),resource)
-sysdep_routines += oldgetrlimit64
-endif
-
 ifeq ($(subdir),stdlib)
 gen-as-const-headers += ucontext_i.sym
 endif
diff --git a/sysdeps/unix/sysv/linux/i386/getrlimit64.c b/sysdeps/unix/sysv/linux/i386/getrlimit64.c
deleted file mode 100644
index 7f3d227beb..0000000000
--- a/sysdeps/unix/sysv/linux/i386/getrlimit64.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/* Copyright (C) 1999-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#define getrlimit64 __new_getrlimit64
-
-#include "../getrlimit64.c"
-
-#undef getrlimit64
-#include <shlib-compat.h>
-versioned_symbol (libc, __getrlimit64, getrlimit64, GLIBC_2_2);
-strong_alias (__getrlimit64, __GI_getrlimit64)
diff --git a/sysdeps/unix/sysv/linux/i386/oldgetrlimit64.c b/sysdeps/unix/sysv/linux/i386/oldgetrlimit64.c
deleted file mode 100644
index ad86a07203..0000000000
--- a/sysdeps/unix/sysv/linux/i386/oldgetrlimit64.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-/* This is a compatibility file.  If we don't build the libc with
-   versioning don't compile this file.  */
-#include <shlib-compat.h>
-#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)
-
-#include <errno.h>
-#include <sys/resource.h>
-#include <sys/types.h>
-
-extern int __new_getrlimit (enum __rlimit_resource, struct rlimit *);
-extern int __old_getrlimit64 (enum __rlimit_resource resource,
-			      struct rlimit64 *rlimits);
-
-
-/* Put the soft and hard limits for RESOURCE in *RLIMITS.
-   Returns 0 if successful, -1 if not (and sets errno).  */
-int
-attribute_compat_text_section
-__old_getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
-{
-  struct rlimit rlimits32;
-
-  if (__new_getrlimit (resource, &rlimits32) < 0)
-    return -1;
-
-  if (rlimits32.rlim_cur == RLIM_INFINITY)
-    rlimits->rlim_cur = RLIM64_INFINITY >> 1;
-  else
-    rlimits->rlim_cur = rlimits32.rlim_cur;
-  if (rlimits32.rlim_max == RLIM_INFINITY)
-    rlimits->rlim_max = RLIM64_INFINITY >> 1;
-  else
-    rlimits->rlim_max = rlimits32.rlim_max;
-
-  return 0;
-}
-
-compat_symbol (libc, __old_getrlimit64, getrlimit64, GLIBC_2_1);
-
-#endif /* SHLIB_COMPAT */
diff --git a/sysdeps/unix/sysv/linux/i386/syscalls.list b/sysdeps/unix/sysv/linux/i386/syscalls.list
index 6282ff8e2f..145393f780 100644
--- a/sysdeps/unix/sysv/linux/i386/syscalls.list
+++ b/sysdeps/unix/sysv/linux/i386/syscalls.list
@@ -18,8 +18,6 @@ setfsuid	-	setfsuid32	Ei:i	setfsuid
 modify_ldt	EXTRA	modify_ldt	i:ipi	__modify_ldt	modify_ldt
 vm86old		EXTRA	vm86old		i:p	__vm86old	vm86@GLIBC_2.0
 vm86		-	vm86		i:ip	__vm86		vm86@@GLIBC_2.3.4
-oldgetrlimit	EXTRA	getrlimit	i:ip	__old_getrlimit	getrlimit@GLIBC_2.0
-setrlimit	-	setrlimit	i:ip	__setrlimit	setrlimit@GLIBC_2.0 setrlimit@@GLIBC_2.2
 waitpid		-	waitpid		Ci:ipi	__waitpid	waitpid
 
 prlimit64	EXTRA	prlimit64	i:iipp	prlimit64