MFC r278751:

Properly interpose libc spinlocks, was missed in r276630.

3 files changed, 26 insertions, 22 deletions

diff --git a/lib/libc/gen/_spinlock_stub.c b/lib/libc/gen/_spinlock_stub.c
index 47bbfeb..fddfc1b 100644
--- a/lib/libc/gen/_spinlock_stub.c
+++ b/lib/libc/gen/_spinlock_stub.c
@@ -33,51 +33,48 @@ __FBSDID("$FreeBSD$");
 #include <stdio.h>
 
 #include "spinlock.h"
+#include "libc_private.h"
 
 long _atomic_lock_stub(volatile long *);
 void _spinlock_stub(spinlock_t *);
 void _spinunlock_stub(spinlock_t *);
 void _spinlock_debug_stub(spinlock_t *, char *, int);
 
-/*
- * Declare weak definitions in case the application is not linked
- * with libpthread.
- */
 __weak_reference(_atomic_lock_stub, _atomic_lock);
-__weak_reference(_spinlock_stub, _spinlock);
-__weak_reference(_spinunlock_stub, _spinunlock);
-__weak_reference(_spinlock_debug_stub, _spinlock_debug);
 
-/*
- * This function is a stub for the _atomic_lock function in libpthread.
- */
 long
 _atomic_lock_stub(volatile long *lck __unused)
 {
 	return (0L);
 }
 
+__weak_reference(_spinlock, _spinlock_debug);
+#pragma weak _spinlock
+void
+_spinlock(spinlock_t *lck)
+{
 
-/*
- * This function is a stub for the spinlock function in libpthread.
- */
+	((void (*)(spinlock_t *lck))__libc_interposing[INTERPOS_spinlock])
+	    (lck);
+
+}
+
+#pragma weak _spinlock
 void
-_spinlock_stub(spinlock_t *lck __unused)
+_spinunlock(spinlock_t *lck)
 {
+
+	((void (*)(spinlock_t *lck))__libc_interposing[INTERPOS_spinunlock])
+	    (lck);
+
 }
 
-/*
- * This function is a stub for the spinunlock function in libpthread.
- */
 void
-_spinunlock_stub(spinlock_t *lck __unused)
+__libc_spinlock_stub(spinlock_t *lck __unused)
 {
 }
 
-/*
- * This function is a stub for the debug spinlock function in libpthread.
- */
 void
-_spinlock_debug_stub(spinlock_t *lck __unused, char *fname __unused, int lineno __unused)
+__libc_spinunlock_stub(spinlock_t *lck __unused)
 {
 }
diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h
index 347b463..7468f9d 100644
--- a/lib/libc/include/libc_private.h
+++ b/lib/libc/include/libc_private.h
@@ -95,6 +95,9 @@ do {							\
 		_SPINUNLOCK(&__stdio_thread_lock);	\
 } while (0)
 
+void		__libc_spinlock_stub(struct _spinlock *);
+void		__libc_spinunlock_stub(struct _spinlock *);
+
 /*
  * Indexes into the pthread jump table.
  *
@@ -216,6 +219,8 @@ enum {
 	INTERPOS_write,
 	INTERPOS_writev,
 	INTERPOS__pthread_mutex_init_calloc_cb,
+	INTERPOS_spinlock,
+	INTERPOS_spinunlock,
 	INTERPOS_MAX
 };
 
diff --git a/lib/libc/sys/interposing_table.c b/lib/libc/sys/interposing_table.c
index d303779..0fd6c75 100644
--- a/lib/libc/sys/interposing_table.c
+++ b/lib/libc/sys/interposing_table.c
@@ -73,6 +73,8 @@ interpos_func_t __libc_interposing[INTERPOS_MAX] = {
 	SLOT(write, __sys_write),
 	SLOT(writev, __sys_writev),
 	SLOT(_pthread_mutex_init_calloc_cb, _pthread_mutex_init_calloc_cb_stub),
+	SLOT(spinlock, __libc_spinlock_stub),
+	SLOT(spinunlock, __libc_spinunlock_stub),
 };
 #undef SLOT