Fix: pass private data to context callbacks

[lttng-ust.git] / libringbuffer / shm.h

diff --git a/libringbuffer/shm.h b/libringbuffer/shm.h
index d7393cd255edea3fc4aca79904b657096b7c6a80..c3ce4ef891a998549844c09c5b5f41ceac133c4d 100644 (file)
--- a/libringbuffer/shm.h
+++ b/libringbuffer/shm.h
@@ -1,26 +1,12 @@
-#ifndef _LIBRINGBUFFER_SHM_H
-#define _LIBRINGBUFFER_SHM_H
-
 /*
- * libringbuffer/shm.h
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This 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; only
- * version 2.1 of the License.
- *
- * This 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 this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef _LIBRINGBUFFER_SHM_H
+#define _LIBRINGBUFFER_SHM_H
+
 #include <stddef.h>
 #include <stdint.h>
 #include <unistd.h>
@@ -31,16 +17,18 @@
 /* channel_handle_create - for UST. */
 extern
 struct lttng_ust_shm_handle *channel_handle_create(void *data,
-                               uint64_t memory_map_size, int wakeup_fd);
+                               uint64_t memory_map_size, int wakeup_fd)
+       __attribute__((visibility("hidden")));
+
 /* channel_handle_add_stream - for UST. */
 extern
 int channel_handle_add_stream(struct lttng_ust_shm_handle *handle,
                int shm_fd, int wakeup_fd, uint32_t stream_nr,
-               uint64_t memory_map_size);
-unsigned int channel_handle_get_nr_streams(struct lttng_ust_shm_handle *handle);
-extern
-void channel_destroy(struct channel *chan, struct lttng_ust_shm_handle *handle,
-               int consumer);
+               uint64_t memory_map_size)
+       __attribute__((visibility("hidden")));
+
+unsigned int channel_handle_get_nr_streams(struct lttng_ust_shm_handle *handle)
+       __attribute__((visibility("hidden")));
 
 /*
  * Pointer dereferencing. We don't trust the shm_ref, so we validate
@@ -70,12 +58,8 @@ char *_shmp_offset(struct shm_object_table *table, struct shm_ref *ref,
        return &obj->memory_map[ref_offset];
 }
 
-#define shmp_index(handle, ref, index)                                 \
-       ({                                                              \
-               __typeof__((ref)._type) ____ptr_ret;                    \
-               ____ptr_ret = (__typeof__(____ptr_ret)) _shmp_offset((handle)->table, &(ref)._ref, index, sizeof(*____ptr_ret));        \
-               ____ptr_ret;                                            \
-       })
+#define shmp_index(handle, ref, index) \
+       ((__typeof__((ref)._type)) _shmp_offset((handle)->table, &(ref)._ref, index, sizeof(*((ref)._type))))
 
 #define shmp(handle, ref)      shmp_index(handle, ref, 0)
 
@@ -87,19 +71,28 @@ void _set_shmp(struct shm_ref *ref, struct shm_ref src)
 
 #define set_shmp(ref, src)     _set_shmp(&(ref)._ref, src)
 
-struct shm_object_table *shm_object_table_create(size_t max_nb_obj);
+struct shm_object_table *shm_object_table_create(size_t max_nb_obj)
+       __attribute__((visibility("hidden")));
+
 struct shm_object *shm_object_table_alloc(struct shm_object_table *table,
                        size_t memory_map_size,
                        enum shm_object_type type,
                        const int stream_fd,
-                       int cpu);
+                       int cpu)
+       __attribute__((visibility("hidden")));
+
 struct shm_object *shm_object_table_append_shm(struct shm_object_table *table,
                        int shm_fd, int wakeup_fd, uint32_t stream_nr,
-                       size_t memory_map_size);
+                       size_t memory_map_size)
+       __attribute__((visibility("hidden")));
+
 /* mem ownership is passed to shm_object_table_append_mem(). */
 struct shm_object *shm_object_table_append_mem(struct shm_object_table *table,
-                       void *mem, size_t memory_map_size, int wakeup_fd);
-void shm_object_table_destroy(struct shm_object_table *table, int consumer);
+                       void *mem, size_t memory_map_size, int wakeup_fd)
+       __attribute__((visibility("hidden")));
+
+void shm_object_table_destroy(struct shm_object_table *table, int consumer)
+       __attribute__((visibility("hidden")));
 
 /*
  * zalloc_shm - allocate memory within a shm object.
@@ -108,8 +101,11 @@ void shm_object_table_destroy(struct shm_object_table *table, int consumer);
  * *NOT* multithread-safe (should be protected by mutex).
  * Returns a -1, -1 tuple on error.
  */
-struct shm_ref zalloc_shm(struct shm_object *obj, size_t len);
-void align_shm(struct shm_object *obj, size_t align);
+struct shm_ref zalloc_shm(struct shm_object *obj, size_t len)
+       __attribute__((visibility("hidden")));
+
+void align_shm(struct shm_object *obj, size_t align)
+       __attribute__((visibility("hidden")));
 
 static inline
 int shm_get_wait_fd(struct lttng_ust_shm_handle *handle, struct shm_ref *ref)