X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fshm.h;h=3a61a39d5e1d86a77d1df100017fe12b7a737ff1;hb=616d3093e1c34557aca7e9f6149338f43cf91886;hp=e8fc8d70384910139306e0d2d0fbcfc41cbcb615;hpb=4318ae1be57eb7983ab4857a7a8eeb4a030a8216;p=lttng-ust.git

diff --git a/libringbuffer/shm.h b/libringbuffer/shm.h
index e8fc8d70..3a61a39d 100644
--- a/libringbuffer/shm.h
+++ b/libringbuffer/shm.h
@@ -4,15 +4,28 @@
 /*
  * libringbuffer/shm.h
  *
- * Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * 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
  */
 
 #include <stdint.h>
-#include <lttng/usterr-signal-safe.h>
-#include "lttng/core.h"
+#include <usterr-signal-safe.h>
+#include <urcu/compiler.h>
 #include "shm_types.h"
+#include <fcntl.h>
 
 /*
  * Pointer dereferencing. We don't trust the shm_ref, so we validate
@@ -87,8 +100,37 @@ int shm_get_wakeup_fd(struct lttng_ust_shm_handle *handle, struct shm_ref *ref)
 	if (caa_unlikely(index >= table->allocated_len))
 		return -EPERM;
 	obj = &table->objects[index];
+
 	return obj->wait_fd[1];
+}
+
+static inline
+int shm_open_wakeup_pipe(struct lttng_ust_shm_handle *handle, struct shm_ref *ref)
+{
+	struct shm_object_table *table = handle->table;
+	struct shm_object *obj;
+	size_t index;
+	int fd, ret = -1;
+
+	index = (size_t) ref->index;
+	if (caa_unlikely(index >= table->allocated_len))
+		return -EPERM;
+
+	obj = &table->objects[index];
 
+	if (obj->wait_fd[1] < 0 && obj->wait_pipe_path != NULL) {
+		fd = open(obj->wait_pipe_path, O_WRONLY);
+		if (fd < 0) {
+			ret = -1;
+		} else {
+			/* FIXME: What if fcntl fail? */
+			fcntl(fd, F_SETFD, FD_CLOEXEC);
+			obj->wait_fd[1] = fd;
+			ret = 0;
+		}
+	}
+
+	return ret;
 }
 
 static inline
@@ -107,7 +149,9 @@ int shm_get_wait_fd(struct lttng_ust_shm_handle *handle, struct shm_ref *ref)
 
 static inline
 int shm_get_object_data(struct lttng_ust_shm_handle *handle, struct shm_ref *ref,
-		int *shm_fd, int *wait_fd, uint64_t *memory_map_size)
+			int **shm_fd, char **shm_path,
+			int **wait_fd, char **wait_pipe_path,
+			uint64_t **memory_map_size)
 {
 	struct shm_object_table *table = handle->table;
 	struct shm_object *obj;
@@ -117,9 +161,11 @@ int shm_get_object_data(struct lttng_ust_shm_handle *handle, struct shm_ref *ref
 	if (caa_unlikely(index >= table->allocated_len))
 		return -EPERM;
 	obj = &table->objects[index];
-	*shm_fd = obj->shm_fd;
-	*wait_fd = obj->wait_fd[0];
-	*memory_map_size = obj->allocated_len;
+	*shm_fd   = &obj->shm_fd;
+	*shm_path = obj->shm_path;
+	*wait_fd        = &obj->wait_fd[0];
+	*wait_pipe_path = obj->wait_pipe_path;
+	*memory_map_size = &obj->allocated_len;
 	return 0;
 }