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Fix posix_spawn getrlimit64 namespace (bug 17991)

posix_spawn (a standard POSIX function) brings in a use of getrlimit64
(not a standard POSIX function).  This patch fixes this by using
__getrlimit64 and making getrlimit64 a weak alias.

This is more complicated than some such changes because of files that
define getrlimit64 in their own way using symbol versioning after
including the main sysdeps/unix/sysv/linux/getrlimit64.c with a
getrlimit macro defined.  There are various existing patterns for such
cases in glibc; the one I've used here is that a getrlimit64 macro
disables the weak_alias / libc_hidden_weak calls, leaving it to the
including file to define the getrlimit64 name in whatever way is
appropriate.

Tested for x86_64 and x86 that installed stripped shared libraries are
unchanged by this patch.

2015-02-17  Joseph Myers  <joseph@codesourcery.com>

	[BZ #17991]
	* include/sys/resource.h (__getrlimit64): Declare.  Use
	libc_hidden_proto.
	* resource/getrlimit64.c (getrlimit64): Rename to __getrlimit64
	and define as weak alias of __getrlimit64.  Use libc_hidden_weak.
	* sysdeps/posix/spawni.c (__spawni): Call __getrlimit64 instead of
	getrlimit64.
	* sysdeps/unix/sysv/linux/getrlimit64.c (getrlimit64): Rename to
	__getrlimit64.
	[!getrlimit64] (getrlimit64): Define as weak alias of
	__getrlimit64.  Use libc_hidden_weak.
	* sysdeps/unix/sysv/linux/i386/getrlimit64.c (getrlimit64): Define
	using __getrlimit64 not __new_getrlimit64.
	(__GI_getrlimit64): Likewise.
	* sysdeps/unix/sysv/linux/mips/getrlimit64.c (getrlimit64):
	Likewise.
	(__GI_getrlimit64): Likewise.
	(__old_getrlimit64): Use __getrlimit64 not __new_getrlimit64.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/syscalls.list
	(getrlimit): Add __getrlimit64 alias.
	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list (getrlimit):
	Likewise.
	* conform/Makefile (test-xfail-XOPEN2K/spawn.h/linknamespace):
	Remove variable.
	(test-xfail-POSIX2008/spawn.h/linknamespace): Likewise.
	(test-xfail-XOPEN2K8/spawn.h/linknamespace): Likewise.

diff --git a/conform/Makefile b/conform/Makefile
index 331590a..c0c0db7 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -391,7 +391,6 @@ test-xfail-XOPEN2K/netdb.h/linknamespace = yes
 test-xfail-XOPEN2K/regex.h/linknamespace = yes
 test-xfail-XOPEN2K/search.h/linknamespace = yes
 test-xfail-XOPEN2K/signal.h/linknamespace = yes
-test-xfail-XOPEN2K/spawn.h/linknamespace = yes
 test-xfail-XOPEN2K/stdlib.h/linknamespace = yes
 test-xfail-XOPEN2K/sys/wait.h/linknamespace = yes
 test-xfail-XOPEN2K/syslog.h/linknamespace = yes
@@ -403,7 +402,6 @@ test-xfail-POSIX2008/grp.h/linknamespace = yes
 test-xfail-POSIX2008/netdb.h/linknamespace = yes
 test-xfail-POSIX2008/regex.h/linknamespace = yes
 test-xfail-POSIX2008/semaphore.h/linknamespace = yes
-test-xfail-POSIX2008/spawn.h/linknamespace = yes
 test-xfail-POSIX2008/unistd.h/linknamespace = yes
 test-xfail-XOPEN2K8/dirent.h/linknamespace = yes
 test-xfail-XOPEN2K8/fmtmsg.h/linknamespace = yes
@@ -412,6 +410,5 @@ test-xfail-XOPEN2K8/netdb.h/linknamespace = yes
 test-xfail-XOPEN2K8/pwd.h/linknamespace = yes
 test-xfail-XOPEN2K8/regex.h/linknamespace = yes
 test-xfail-XOPEN2K8/search.h/linknamespace = yes
-test-xfail-XOPEN2K8/spawn.h/linknamespace = yes
 test-xfail-XOPEN2K8/syslog.h/linknamespace = yes
 test-xfail-XOPEN2K8/unistd.h/linknamespace = yes
diff --git a/include/sys/resource.h b/include/sys/resource.h
index 1ce190f..7622da9 100644
--- a/include/sys/resource.h
+++ b/include/sys/resource.h
@@ -5,6 +5,8 @@
 libc_hidden_proto (getpriority)
 libc_hidden_proto (setpriority)
 libc_hidden_proto (getrlimit64)
+extern __typeof (getrlimit64) __getrlimit64;
+libc_hidden_proto (__getrlimit64);
 
 /* Now define the internal interfaces.  */
 extern int __getrlimit (enum __rlimit_resource __resource,
diff --git a/resource/getrlimit64.c b/resource/getrlimit64.c
index 6d22eca..cb494cc 100644
--- a/resource/getrlimit64.c
+++ b/resource/getrlimit64.c
@@ -22,7 +22,7 @@
 /* Put the soft and hard limits for RESOURCE in *RLIMITS.
    Returns 0 if successful, -1 if not (and sets errno).  */
 int
-getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
+__getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
 {
   struct rlimit rlimits32;
 
@@ -40,4 +40,6 @@ getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
 
   return 0;
 }
-libc_hidden_def (getrlimit64)
+libc_hidden_def (__getrlimit64)
+weak_alias (__getrlimit64, getrlimit64)
+libc_hidden_weak (getrlimit64)
diff --git a/sysdeps/posix/spawni.c b/sysdeps/posix/spawni.c
index 4a25c89..eee9331 100644
--- a/sysdeps/posix/spawni.c
+++ b/sysdeps/posix/spawni.c
@@ -188,7 +188,7 @@ __spawni (pid_t *pid, const char *file,
 		{
 		  if (! have_fdlimit)
 		    {
-		      getrlimit64 (RLIMIT_NOFILE, &fdlimit);
+		      __getrlimit64 (RLIMIT_NOFILE, &fdlimit);
 		      have_fdlimit = true;
 		    }
 
diff --git a/sysdeps/unix/sysv/linux/getrlimit64.c b/sysdeps/unix/sysv/linux/getrlimit64.c
index 461d345..100ba62 100644
--- a/sysdeps/unix/sysv/linux/getrlimit64.c
+++ b/sysdeps/unix/sysv/linux/getrlimit64.c
@@ -24,7 +24,7 @@
 /* Put the soft and hard limits for RESOURCE in *RLIMITS.
    Returns 0 if successful, -1 if not (and sets errno).  */
 int
-getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
+__getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
 {
 #ifdef __ASSUME_PRLIMIT64
   return INLINE_SYSCALL (prlimit64, 4, 0, resource, NULL, rlimits);
@@ -51,4 +51,8 @@ getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
   return 0;
 #endif
 }
-libc_hidden_def (getrlimit64)
+libc_hidden_def (__getrlimit64)
+#ifndef getrlimit64
+weak_alias (__getrlimit64, getrlimit64)
+libc_hidden_weak (getrlimit64)
+#endif
diff --git a/sysdeps/unix/sysv/linux/i386/getrlimit64.c b/sysdeps/unix/sysv/linux/i386/getrlimit64.c
index a771584..8bd3bd9 100644
--- a/sysdeps/unix/sysv/linux/i386/getrlimit64.c
+++ b/sysdeps/unix/sysv/linux/i386/getrlimit64.c
@@ -21,5 +21,5 @@
 
 #undef getrlimit64
 #include <shlib-compat.h>
-versioned_symbol (libc, __new_getrlimit64, getrlimit64, GLIBC_2_2);
-strong_alias (__new_getrlimit64, __GI_getrlimit64)
+versioned_symbol (libc, __getrlimit64, getrlimit64, GLIBC_2_2);
+strong_alias (__getrlimit64, __GI_getrlimit64)
diff --git a/sysdeps/unix/sysv/linux/mips/getrlimit64.c b/sysdeps/unix/sysv/linux/mips/getrlimit64.c
index 7080f77..751b11a 100644
--- a/sysdeps/unix/sysv/linux/mips/getrlimit64.c
+++ b/sysdeps/unix/sysv/linux/mips/getrlimit64.c
@@ -25,8 +25,8 @@
 # include <sysdeps/unix/sysv/linux/getrlimit64.c>
 # undef getrlimit64
 
-versioned_symbol (libc, __new_getrlimit64, getrlimit64, GLIBC_2_19);
-strong_alias (__new_getrlimit64, __GI_getrlimit64)
+versioned_symbol (libc, __getrlimit64, getrlimit64, GLIBC_2_19);
+strong_alias (__getrlimit64, __GI_getrlimit64)
 
 # if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_19)
 
@@ -45,7 +45,7 @@ __old_getrlimit64 (enum __rlimit_resource resource,
 {
   struct rlimit64 krlimits;
 
-  if (__new_getrlimit64 (resource, &krlimits) < 0)
+  if (__getrlimit64 (resource, &krlimits) < 0)
     return -1;
 
   if (krlimits.rlim_cur == RLIM64_INFINITY)
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/syscalls.list b/sysdeps/unix/sysv/linux/powerpc/powerpc64/syscalls.list
index aee60bf..6ba6f9b 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/syscalls.list
@@ -1,3 +1,3 @@
 # File name	Caller	Syscall name	# args	Strong name	Weak names
 
-getrlimit	-	ugetrlimit	i:ip	__getrlimit	getrlimit getrlimit64
+getrlimit	-	ugetrlimit	i:ip	__getrlimit	getrlimit getrlimit64 __getrlimit64
diff --git a/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list b/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
index 77aa246..2876bbd 100644
--- a/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
@@ -10,7 +10,7 @@ statfs		-	statfs		i:sp	__statfs	statfs statfs64
 mmap		-	mmap		b:aniiii __mmap		mmap __mmap64 mmap64
 ftruncate	-	ftruncate	i:ii	__ftruncate	ftruncate ftruncate64 __ftruncate64
 truncate	-	truncate	i:si	truncate	truncate64
-getrlimit	-	getrlimit	i:ip	__getrlimit	getrlimit getrlimit64
+getrlimit	-	getrlimit	i:ip	__getrlimit	getrlimit getrlimit64 __getrlimit64
 setrlimit	-	setrlimit	i:ip	__setrlimit	setrlimit setrlimit64
 readahead	-	readahead	i:iii	__readahead	readahead
 sendfile	-	sendfile	i:iipi	sendfile	sendfile64

-- 
Joseph S. Myers
joseph@codesourcery.com
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