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[v1.2] Deprecate malloc_(sg)et state.

Message ID 20140516184537.GA5856@domone.podge
State New
Headers show

Commit Message

Ondřej Bílka May 16, 2014, 6:45 p.m. UTC 
On Mon, Apr 28, 2014 at 03:07:20PM +0000, Joseph S. Myers wrote:
> On Mon, 28 Apr 2014, Ondrej Bilka wrote:
> 
> > On Mon, Apr 28, 2014 at 02:55:18PM +0000, Joseph S. Myers wrote:
> > > On Mon, 28 Apr 2014, Ondrej Bilka wrote:
> > > 
> > > > +  malloc_get_state = dlvsym (RTLD_NEXT, "malloc_get_state", "GLIBC_2.2.5");
> > > > +  malloc_set_state = dlvsym (RTLD_NEXT, "malloc_set_state", "GLIBC_2.2.5");
> > > 
> > > That's not correct.  GLIBC_2.2.5 is what GLIBC_2.0 maps to on x86_64, but 
> > > on other architectures it maps to other versions; you need the correct 
> > > version depending on the architecture.
> > > 
> > Any macro for that?
> 
> Try stringizing the expansion of VERSION_libc_GLIBC_2_0 from 
> abi-versions.h.
>
Here is new version. Is there some other concern? 


        * malloc/malloc.c: Make malloc_get_state and malloc_set_state
        compatibility symbols.
        * malloc/hooks.c: Likewise.
        * malloc/tst-mallocstate.c (main): Use dynamic loader to get
         malloc_get_state and malloc_set_state symbols.
        * malloc/Makefile: Link tst-mallocstate with libdl.

Comments

Joseph Myers May 16, 2014, 8:32 p.m. UTC | #1 
On Fri, 16 May 2014, Ondrej Bilka wrote:

> On Mon, Apr 28, 2014 at 03:07:20PM +0000, Joseph S. Myers wrote:
> > On Mon, 28 Apr 2014, Ondrej Bilka wrote:
> > 
> > > On Mon, Apr 28, 2014 at 02:55:18PM +0000, Joseph S. Myers wrote:
> > > > On Mon, 28 Apr 2014, Ondrej Bilka wrote:
> > > > 
> > > > > +  malloc_get_state = dlvsym (RTLD_NEXT, "malloc_get_state", "GLIBC_2.2.5");
> > > > > +  malloc_set_state = dlvsym (RTLD_NEXT, "malloc_set_state", "GLIBC_2.2.5");
> > > > 
> > > > That's not correct.  GLIBC_2.2.5 is what GLIBC_2.0 maps to on x86_64, but 
> > > > on other architectures it maps to other versions; you need the correct 
> > > > version depending on the architecture.
> > > > 
> > > Any macro for that?
> > 
> > Try stringizing the expansion of VERSION_libc_GLIBC_2_0 from 
> > abi-versions.h.
> >
> Here is new version. Is there some other concern? 

This sort of feature change should include an addition to the NEWS file.
diff mbox

Patch

diff --git a/malloc/Makefile b/malloc/Makefile
index d962331..2c3bf06 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -149,6 +149,7 @@  $(objpfx)memusage: memusage.sh
 
 # The implementation uses `dlsym'
 $(objpfx)libmemusage.so: $(common-objpfx)dlfcn/libdl.so
+$(objpfx)tst-mallocstate: $(common-objpfx)dlfcn/libdl.so
 
 # Extra dependencies
 $(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 00ee6be..442983e 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -474,6 +474,8 @@  struct malloc_save_state
   unsigned long narenas;
 };
 
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_20)
+
 void *
 __malloc_get_state (void)
 {
@@ -644,6 +646,7 @@  __malloc_set_state (void *msptr)
   (void) mutex_unlock (&main_arena.mutex);
   return 0;
 }
+#endif
 
 /*
  * Local variables:
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 1120d4d..575a241 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -5181,9 +5181,16 @@  strong_alias (__libc_mallopt, __mallopt) weak_alias (__libc_mallopt, mallopt)
 weak_alias (__malloc_stats, malloc_stats)
 weak_alias (__malloc_usable_size, malloc_usable_size)
 weak_alias (__malloc_trim, malloc_trim)
+
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_20)
+
 weak_alias (__malloc_get_state, malloc_get_state)
 weak_alias (__malloc_set_state, malloc_set_state)
 
+compat_symbol (libc, malloc_get_state, malloc_get_state, GLIBC_2_0);
+compat_symbol (libc, malloc_set_state, malloc_set_state, GLIBC_2_0);
+
+#endif
 
 /* ------------------------------------------------------------
    History:
diff --git a/malloc/tst-mallocstate.c b/malloc/tst-mallocstate.c
index 69c4500..709aaba 100644
--- a/malloc/tst-mallocstate.c
+++ b/malloc/tst-mallocstate.c
@@ -16,9 +16,16 @@ 
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#define _GNU_SOURCE
+#include <dlfcn.h>
 #include <errno.h>
 #include <stdio.h>
 #include "malloc.h"
+#include <abi-versions.h>
+
+#define STRINGIFY(x) #x
+#define STR_GLIBC_2_0 STRINGIFY (VERSION_libc_GLIBC_2_0)
+
 
 static int errors = 0;
 
@@ -36,6 +43,12 @@  main (void)
   void *save_state;
   long i;
 
+  void *(*malloc_get_state)();
+  void *(*malloc_set_state)(void ());
+
+  malloc_get_state = dlvsym (RTLD_NEXT, "malloc_get_state", STR_GLIBC_2_0);
+  malloc_set_state = dlvsym (RTLD_NEXT, "malloc_set_state", STR_GLIBC_2_0);
+
   errno = 0;
 
   p1 = malloc (10);