X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fshm.c;h=994204d1e0a2463829a8e73e3cb0cf078eae1c0f;hb=35897f8b2d311b756b81657dad9c53ef1c0fad8a;hp=0d92572d7b5b6170d79ed7e457e115bba957b7ef;hpb=5a61337d8b92f7419e58e5b46ffc4f75ac6269af;p=lttng-ust.git

diff --git a/libringbuffer/shm.c b/libringbuffer/shm.c
index 0d92572d..994204d1 100644
--- a/libringbuffer/shm.c
+++ b/libringbuffer/shm.c
@@ -16,7 +16,8 @@
 #include <stdio.h>
 #include <signal.h>
 #include <dirent.h>
-#include <ust/align.h>
+#include <lttng/align.h>
+#include <helper.h>
 
 struct shm_object_table *shm_object_table_create(size_t max_nb_obj)
 {
@@ -165,22 +166,59 @@ error_pipe:
 	
 }
 
+struct shm_object *shm_object_table_append_shadow(struct shm_object_table *table,
+			int shm_fd, int wait_fd, size_t memory_map_size)
+{
+	struct shm_object *obj;
+	char *memory_map;
+
+	if (table->allocated_len >= table->size)
+		return NULL;
+	obj = &table->objects[table->allocated_len];
+
+	/* wait_fd: set read end of the pipe. */
+	obj->wait_fd[0] = wait_fd;
+	obj->wait_fd[1] = -1;	/* write end is unset. */
+	obj->shm_fd = shm_fd;
+
+	/* memory_map: mmap */
+	memory_map = mmap(NULL, memory_map_size, PROT_READ | PROT_WRITE,
+			  MAP_SHARED, shm_fd, 0);
+	if (memory_map == MAP_FAILED) {
+		PERROR("mmap");
+		goto error_mmap;
+	}
+	obj->memory_map = memory_map;
+	obj->memory_map_size = memory_map_size;
+	obj->allocated_len = memory_map_size;
+	obj->index = table->allocated_len++;
+
+	return obj;
+
+error_mmap:
+	return NULL;
+}
+
 static
 void shmp_object_destroy(struct shm_object *obj)
 {
 	int ret, i;
 
-        ret = munmap(obj->memory_map, obj->memory_map_size);
-        if (ret) {
-                PERROR("umnmap");
-                assert(0);
-        }
+	if (!obj->is_shadow) {
+		ret = munmap(obj->memory_map, obj->memory_map_size);
+		if (ret) {
+			PERROR("umnmap");
+			assert(0);
+		}
+	}
 	ret = close(obj->shm_fd);
 	if (ret) {
 		PERROR("close");
 		assert(0);
 	}
 	for (i = 0; i < 2; i++) {
+		if (obj->wait_fd[i] < 0)
+			continue;
 		ret = close(obj->wait_fd[i]);
 		if (ret) {
 			PERROR("close");