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[PATCH 2/5] Clean pthread functions namespaces for C11 threads


From: Juan Manuel Torres Palma <jmtorrespalma@gmail.com>

This patch creates weak aliases for all conflicting functions with
C11 threads.h functions, allowing user to redefine them. Some functions
do not need aliases as they have already been defined as versioned
symbols.

2015-08-06  Juan Manuel Torres Palma  <jmtorrespalma@gmail.com>

	* misc/Versions (__mmap, __munmap, __mprotect): Export private
	symbols for calls from libpthread.
	* nptl/allocatestack.c: Modify calls to mmap, munmap and mprotect
	to namespace safe versions __mmap, __munmap and __mprotect.
	* nptl/pthreadP.h (__pthread_mutex_timedlock, __pthread_key_delete)
	(__pthread_detach, __pthread_join, __pthread_cancel): Add functions
	prototypes.
	* nptl/pthread_cancel.c (__pthread_cancel): Change static 
	requirements.
	(pthread_cancel): Declare as weak alias.
	* nptl/pthread_create.c: Change static requirements.
	* nptl/pthread_detach.c (pthread_detach): Declare as weak alias.
	(__pthread_detach): Rename pthread_detach function.
	* nptl/pthread_equal.c (pthread_equal): Declare as weak alias.
	* nptl/pthread_exit.c (pthread_exit): Likewise.
	(__pthread_exit): Change static requirements.
	* nptl/pthread_getspecific.c (pthread_getspecific): Declare as weak
	alias.
	* nptl/pthread_join.c (pthread_join): Declare as weak alias.
	(__pthread_join): Rename pthread_join function.
	* nptl/pthread_key_create.c (pthread_key_create): 
	Declare as weak alias.
	* nptl/pthread_key_delete.c (pthread_key_delete): 
	Declare as weak alias.
	(__pthread_key_delete): Rename pthread_key_delete function.
	* nptl/pthread_mutex_destroy.c (pthread_mutex_destroy): 
	Declare as weak alias.
	* nptl/pthread_mutex_init.c (pthread_mutex_init): Likewise.
	* nptl/pthread_mutex_lock.c (pthread_mutex_lock): Likewise.
	* nptl/pthread_mutex_timedlock.c (pthread_mutex_timedlock): Likewise.
	(__pthread_mutex_timedlock): Rename pthread_mutex_timedlock function.
	* nptl/pthread_mutex_trylock.c (pthread_mutex_trylock):
	Declare as weak alias.
	* nptl/pthread_mutex_unlock.c (pthread_mutex_unlock): Likewise.
	* nptl/pthread_mutexattr_init.c (pthread_mutexattr_init): Likewise.
	* nptl/pthread_mutexattr_settype.c
	(pthread_mutexattr_init): Likewise.
	* nptl/pthread_self.c (pthread_self): Likewise.
	* nptl/pthread_setspecific.c (pthread_setspecific): Likewise.
	* nptl/tpp.c: Modify calls to sched_get_priority_max and
	sched_get_priority_min to namespace safe versions.
	* sysdeps/posix/gethostname.c: Modyfy call to uname, to
	__uname.

---
 misc/Versions                    |  1 +
 nptl/allocatestack.c             | 22 +++++++++++-----------
 nptl/pthreadP.h                  |  6 ++++++
 nptl/pthread_cancel.c            |  5 +++--
 nptl/pthread_create.c            | 18 +++++++++---------
 nptl/pthread_detach.c            |  3 ++-
 nptl/pthread_equal.c             |  2 +-
 nptl/pthread_exit.c              |  4 ++--
 nptl/pthread_getspecific.c       |  2 +-
 nptl/pthread_join.c              |  3 ++-
 nptl/pthread_key_create.c        |  2 +-
 nptl/pthread_key_delete.c        |  3 ++-
 nptl/pthread_mutex_destroy.c     |  2 +-
 nptl/pthread_mutex_init.c        |  2 +-
 nptl/pthread_mutex_lock.c        |  2 +-
 nptl/pthread_mutex_timedlock.c   |  3 ++-
 nptl/pthread_mutex_trylock.c     |  2 +-
 nptl/pthread_mutex_unlock.c      |  2 +-
 nptl/pthread_mutexattr_init.c    |  2 +-
 nptl/pthread_mutexattr_settype.c |  2 +-
 nptl/pthread_self.c              |  2 +-
 nptl/pthread_setspecific.c       |  2 +-
 nptl/tpp.c                       |  4 ++--
 sysdeps/posix/gethostname.c      |  2 +-
 24 files changed, 55 insertions(+), 43 deletions(-)

diff --git a/misc/Versions b/misc/Versions
index 534d1a3..9842090 100644
--- a/misc/Versions
+++ b/misc/Versions
@@ -154,5 +154,6 @@ libc {
     __mktemp;
     __libc_ifunc_impl_list;
     __tdelete; __tfind; __tsearch; __twalk;
+    __mmap; __munmap; __mprotect;
   }
 }
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 753da61..8fc681c 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -285,7 +285,7 @@ __free_stacks (size_t limit)
 
 	  /* Remove this block.  This should never fail.  If it does
 	     something is really wrong.  */
-	  if (munmap (curr->stackblock, curr->stackblock_size) != 0)
+	  if (__munmap (curr->stackblock, curr->stackblock_size) != 0)
 	    abort ();
 
 	  /* Maybe we have freed enough.  */
@@ -335,7 +335,7 @@ change_stack_perm (struct pthread *pd
 #else
 # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
 #endif
-  if (mprotect (stack, len, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
+  if (__mprotect (stack, len, PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
     return errno;
 
   return 0;
@@ -501,7 +501,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	    size += pagesize_m1 + 1;
 #endif
 
-	  mem = mmap (NULL, size, prot,
+	  mem = __mmap (NULL, size, prot,
 		      MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
 
 	  if (__glibc_unlikely (mem == MAP_FAILED))
@@ -582,7 +582,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	      assert (errno == ENOMEM);
 
 	      /* Free the stack memory we just allocated.  */
-	      (void) munmap (mem, size);
+	      (void) __munmap (mem, size);
 
 	      return errno;
 	    }
@@ -612,7 +612,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	      if (err != 0)
 		{
 		  /* Free the stack memory we just allocated.  */
-		  (void) munmap (mem, size);
+		  (void) __munmap (mem, size);
 
 		  return err;
 		}
@@ -637,7 +637,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 # elif _STACK_GROWS_UP
 	  char *guard = (char *) (((uintptr_t) pd - guardsize) & ~pagesize_m1);
 #endif
-	  if (mprotect (guard, guardsize, PROT_NONE) != 0)
+	  if (__mprotect (guard, guardsize, PROT_NONE) != 0)
 	    {
 	    mprot_error:
 	      lll_lock (stack_cache_lock, LLL_PRIVATE);
@@ -655,7 +655,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 		 of memory caused problems we better do not use it
 		 anymore.  Uh, and we ignore possible errors.  There
 		 is nothing we could do.  */
-	      (void) munmap (mem, size);
+	      (void) __munmap (mem, size);
 
 	      return errno;
 	    }
@@ -672,19 +672,19 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	  char *oldguard = mem + (((size - pd->guardsize) / 2) & ~pagesize_m1);
 
 	  if (oldguard < guard
-	      && mprotect (oldguard, guard - oldguard, prot) != 0)
+	      && __mprotect (oldguard, guard - oldguard, prot) != 0)
 	    goto mprot_error;
 
-	  if (mprotect (guard + guardsize,
+	  if (__mprotect (guard + guardsize,
 			oldguard + pd->guardsize - guard - guardsize,
 			prot) != 0)
 	    goto mprot_error;
 #elif _STACK_GROWS_DOWN
-	  if (mprotect ((char *) mem + guardsize, pd->guardsize - guardsize,
+	  if (__mprotect ((char *) mem + guardsize, pd->guardsize - guardsize,
 			prot) != 0)
 	    goto mprot_error;
 #elif _STACK_GROWS_UP
-	  if (mprotect ((char *) pd - pd->guardsize,
+	  if (__mprotect ((char *) pd - pd->guardsize,
 			pd->guardsize - guardsize, prot) != 0)
 	    goto mprot_error;
 #endif
diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index 8cd51c6..6171607 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -414,6 +414,8 @@ extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
+extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
+     const struct timespec *__abstime);
 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
      attribute_hidden internal_function;
 extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
@@ -477,6 +479,7 @@ extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
+extern int __pthread_key_delete (pthread_key_t key);
 extern void *__pthread_getspecific (pthread_key_t key);
 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 extern int __pthread_once (pthread_once_t *once_control,
@@ -485,8 +488,11 @@ extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 			     void (*child) (void));
 extern pthread_t __pthread_self (void);
 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
+extern int __pthread_detach (pthread_t th);
+extern int __pthread_cancel (pthread_t th); 
 extern int __pthread_kill (pthread_t threadid, int signo);
 extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
+extern int __pthread_join (pthread_t threadid, void **thread_return);
 extern int __pthread_setcanceltype (int type, int *oldtype);
 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 extern void __pthread_disable_asynccancel (int oldtype)
diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c
index 981e4bc..6ea6e40 100644
--- a/nptl/pthread_cancel.c
+++ b/nptl/pthread_cancel.c
@@ -25,7 +25,7 @@
 
 
 int
-pthread_cancel (pthread_t th)
+__pthread_cancel (pthread_t th)
 {
   volatile struct pthread *pd = (volatile struct pthread *) th;
 
@@ -108,4 +108,5 @@ pthread_cancel (pthread_t th)
   return result;
 }
 
-PTHREAD_STATIC_FN_REQUIRE (pthread_create)
+weak_alias(__pthread_cancel, pthread_cancel);
+PTHREAD_STATIC_FN_REQUIRE (__pthread_create_2_1)
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
index d10f4ea..16317c7 100644
--- a/nptl/pthread_create.c
+++ b/nptl/pthread_create.c
@@ -768,14 +768,14 @@ compat_symbol (libpthread, __pthread_create_2_0, pthread_create,
 
 /* If pthread_create is present, libgcc_eh.a and libsupc++.a expects some other POSIX thread
    functions to be present as well.  */
-PTHREAD_STATIC_FN_REQUIRE (pthread_mutex_lock)
-PTHREAD_STATIC_FN_REQUIRE (pthread_mutex_trylock)
-PTHREAD_STATIC_FN_REQUIRE (pthread_mutex_unlock)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_mutex_lock)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_mutex_trylock)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_mutex_unlock)
 
-PTHREAD_STATIC_FN_REQUIRE (pthread_once)
-PTHREAD_STATIC_FN_REQUIRE (pthread_cancel)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_once)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_cancel)
 
-PTHREAD_STATIC_FN_REQUIRE (pthread_key_create)
-PTHREAD_STATIC_FN_REQUIRE (pthread_key_delete)
-PTHREAD_STATIC_FN_REQUIRE (pthread_setspecific)
-PTHREAD_STATIC_FN_REQUIRE (pthread_getspecific)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_key_create)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_key_delete)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_setspecific)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_getspecific)
diff --git a/nptl/pthread_detach.c b/nptl/pthread_detach.c
index aa735f6..c7628f1 100644
--- a/nptl/pthread_detach.c
+++ b/nptl/pthread_detach.c
@@ -22,7 +22,7 @@
 
 
 int
-pthread_detach (th)
+__pthread_detach (th)
      pthread_t th;
 {
   struct pthread *pd = (struct pthread *) th;
@@ -54,3 +54,4 @@ pthread_detach (th)
 
   return result;
 }
+weak_alias (__pthread_detach, pthread_detach)
diff --git a/nptl/pthread_equal.c b/nptl/pthread_equal.c
index 69f4c1b..2e730df 100644
--- a/nptl/pthread_equal.c
+++ b/nptl/pthread_equal.c
@@ -26,4 +26,4 @@ __pthread_equal (thread1, thread2)
 {
   return thread1 == thread2;
 }
-strong_alias (__pthread_equal, pthread_equal)
+weak_alias (__pthread_equal, pthread_equal)
diff --git a/nptl/pthread_exit.c b/nptl/pthread_exit.c
index a60adbd..f80e6a5 100644
--- a/nptl/pthread_exit.c
+++ b/nptl/pthread_exit.c
@@ -27,8 +27,8 @@ __pthread_exit (void *value)
 
   __do_cancel ();
 }
-strong_alias (__pthread_exit, pthread_exit)
+weak_alias (__pthread_exit, pthread_exit)
 
 /* After a thread terminates, __libc_start_main decrements
    __nptl_nthreads defined in pthread_create.c.  */
-PTHREAD_STATIC_FN_REQUIRE (pthread_create)
+PTHREAD_STATIC_FN_REQUIRE (__pthread_create_2_1)
diff --git a/nptl/pthread_getspecific.c b/nptl/pthread_getspecific.c
index 0bee354..a5e5f45 100644
--- a/nptl/pthread_getspecific.c
+++ b/nptl/pthread_getspecific.c
@@ -64,5 +64,5 @@ __pthread_getspecific (key)
 
   return result;
 }
-strong_alias (__pthread_getspecific, pthread_getspecific)
+weak_alias (__pthread_getspecific, pthread_getspecific)
 hidden_def (__pthread_getspecific)
diff --git a/nptl/pthread_join.c b/nptl/pthread_join.c
index c841ff9..9635b08 100644
--- a/nptl/pthread_join.c
+++ b/nptl/pthread_join.c
@@ -37,7 +37,7 @@ cleanup (void *arg)
 
 
 int
-pthread_join (pthread_t threadid, void **thread_return)
+__pthread_join (pthread_t threadid, void **thread_return)
 {
   struct pthread *pd = (struct pthread *) threadid;
 
@@ -115,3 +115,4 @@ pthread_join (pthread_t threadid, void **thread_return)
 
   return result;
 }
+weak_alias (__pthread_join, pthread_join)
diff --git a/nptl/pthread_key_create.c b/nptl/pthread_key_create.c
index a642c69..9beec6b 100644
--- a/nptl/pthread_key_create.c
+++ b/nptl/pthread_key_create.c
@@ -49,5 +49,5 @@ __pthread_key_create (key, destr)
 
   return EAGAIN;
 }
-strong_alias (__pthread_key_create, pthread_key_create)
+weak_alias (__pthread_key_create, pthread_key_create)
 hidden_def (__pthread_key_create)
diff --git a/nptl/pthread_key_delete.c b/nptl/pthread_key_delete.c
index bd9b4a2..f201b71 100644
--- a/nptl/pthread_key_delete.c
+++ b/nptl/pthread_key_delete.c
@@ -22,7 +22,7 @@
 
 
 int
-pthread_key_delete (key)
+__pthread_key_delete (key)
      pthread_key_t key;
 {
   int result = EINVAL;
@@ -40,3 +40,4 @@ pthread_key_delete (key)
 
   return result;
 }
+weak_alias (__pthread_key_delete, pthread_key_delete)
diff --git a/nptl/pthread_mutex_destroy.c b/nptl/pthread_mutex_destroy.c
index f6089df..3d40205 100644
--- a/nptl/pthread_mutex_destroy.c
+++ b/nptl/pthread_mutex_destroy.c
@@ -37,5 +37,5 @@ __pthread_mutex_destroy (mutex)
 
   return 0;
 }
-strong_alias (__pthread_mutex_destroy, pthread_mutex_destroy)
+weak_alias (__pthread_mutex_destroy, pthread_mutex_destroy)
 hidden_def (__pthread_mutex_destroy)
diff --git a/nptl/pthread_mutex_init.c b/nptl/pthread_mutex_init.c
index d71cfef..6b9ab16 100644
--- a/nptl/pthread_mutex_init.c
+++ b/nptl/pthread_mutex_init.c
@@ -148,5 +148,5 @@ __pthread_mutex_init (mutex, mutexattr)
 
   return 0;
 }
-strong_alias (__pthread_mutex_init, pthread_mutex_init)
+weak_alias (__pthread_mutex_init, pthread_mutex_init)
 hidden_def (__pthread_mutex_init)
diff --git a/nptl/pthread_mutex_lock.c b/nptl/pthread_mutex_lock.c
index 9a3b466..af20011 100644
--- a/nptl/pthread_mutex_lock.c
+++ b/nptl/pthread_mutex_lock.c
@@ -514,7 +514,7 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
   return 0;
 }
 #ifndef __pthread_mutex_lock
-strong_alias (__pthread_mutex_lock, pthread_mutex_lock)
+weak_alias (__pthread_mutex_lock, pthread_mutex_lock)
 hidden_def (__pthread_mutex_lock)
 #endif
 
diff --git a/nptl/pthread_mutex_timedlock.c b/nptl/pthread_mutex_timedlock.c
index f0fb03e..c74bff1 100644
--- a/nptl/pthread_mutex_timedlock.c
+++ b/nptl/pthread_mutex_timedlock.c
@@ -41,7 +41,7 @@
 #endif
 
 int
-pthread_mutex_timedlock (mutex, abstime)
+__pthread_mutex_timedlock (mutex, abstime)
      pthread_mutex_t *mutex;
      const struct timespec *abstime;
 {
@@ -520,3 +520,4 @@ pthread_mutex_timedlock (mutex, abstime)
  out:
   return result;
 }
+weak_alias (__pthread_mutex_timedlock, pthread_mutex_timedlock)
diff --git a/nptl/pthread_mutex_trylock.c b/nptl/pthread_mutex_trylock.c
index 33df384..229afdf 100644
--- a/nptl/pthread_mutex_trylock.c
+++ b/nptl/pthread_mutex_trylock.c
@@ -404,6 +404,6 @@ __pthread_mutex_trylock (mutex)
 
 #ifndef __pthread_mutex_trylock
 #ifndef pthread_mutex_trylock
-strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
+weak_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
 #endif
 #endif
diff --git a/nptl/pthread_mutex_unlock.c b/nptl/pthread_mutex_unlock.c
index 80939ba..d9ff351 100644
--- a/nptl/pthread_mutex_unlock.c
+++ b/nptl/pthread_mutex_unlock.c
@@ -314,5 +314,5 @@ __pthread_mutex_unlock (mutex)
 {
   return __pthread_mutex_unlock_usercnt (mutex, 1);
 }
-strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
+weak_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
 hidden_def (__pthread_mutex_unlock)
diff --git a/nptl/pthread_mutexattr_init.c b/nptl/pthread_mutexattr_init.c
index 92206b0..ef92f47 100644
--- a/nptl/pthread_mutexattr_init.c
+++ b/nptl/pthread_mutexattr_init.c
@@ -34,4 +34,4 @@ __pthread_mutexattr_init (attr)
 
   return 0;
 }
-strong_alias (__pthread_mutexattr_init, pthread_mutexattr_init)
+weak_alias (__pthread_mutexattr_init, pthread_mutexattr_init)
diff --git a/nptl/pthread_mutexattr_settype.c b/nptl/pthread_mutexattr_settype.c
index c6bd5a6..5651ad1 100644
--- a/nptl/pthread_mutexattr_settype.c
+++ b/nptl/pthread_mutexattr_settype.c
@@ -42,4 +42,4 @@ __pthread_mutexattr_settype (attr, kind)
   return 0;
 }
 weak_alias (__pthread_mutexattr_settype, pthread_mutexattr_setkind_np)
-strong_alias (__pthread_mutexattr_settype, pthread_mutexattr_settype)
+weak_alias (__pthread_mutexattr_settype, pthread_mutexattr_settype)
diff --git a/nptl/pthread_self.c b/nptl/pthread_self.c
index d6ba45c..422151e 100644
--- a/nptl/pthread_self.c
+++ b/nptl/pthread_self.c
@@ -25,4 +25,4 @@ __pthread_self (void)
 {
   return (pthread_t) THREAD_SELF;
 }
-strong_alias (__pthread_self, pthread_self)
+weak_alias (__pthread_self, pthread_self)
diff --git a/nptl/pthread_setspecific.c b/nptl/pthread_setspecific.c
index a9cf26c..36b42f8 100644
--- a/nptl/pthread_setspecific.c
+++ b/nptl/pthread_setspecific.c
@@ -91,5 +91,5 @@ __pthread_setspecific (key, value)
 
   return 0;
 }
-strong_alias (__pthread_setspecific, pthread_setspecific)
+weak_alias (__pthread_setspecific, pthread_setspecific)
 hidden_def (__pthread_setspecific)
diff --git a/nptl/tpp.c b/nptl/tpp.c
index 142c618..a754ab6 100644
--- a/nptl/tpp.c
+++ b/nptl/tpp.c
@@ -43,9 +43,9 @@ void
 __init_sched_fifo_prio (void)
 {
   atomic_store_relaxed (&__sched_fifo_max_prio,
-			sched_get_priority_max (SCHED_FIFO));
+			__sched_get_priority_max (SCHED_FIFO));
   atomic_store_relaxed (&__sched_fifo_min_prio,
-			sched_get_priority_min (SCHED_FIFO));
+			__sched_get_priority_min (SCHED_FIFO));
 }
 
 int
diff --git a/sysdeps/posix/gethostname.c b/sysdeps/posix/gethostname.c
index 4917705..f0bf75f 100644
--- a/sysdeps/posix/gethostname.c
+++ b/sysdeps/posix/gethostname.c
@@ -31,7 +31,7 @@ __gethostname (name, len)
   struct utsname buf;
   size_t node_len;
 
-  if (uname (&buf))
+  if (__uname (&buf))
     return -1;
 
   node_len = strlen (buf.nodename) + 1;
-- 
2.1.0


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