#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
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
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;
if (caa_unlikely(index >= table->allocated_len))
return -EPERM;
obj = &table->objects[index];
- *shm_fd = &obj->shm_fd;
- *wait_fd = &obj->wait_fd[0];
+ *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;
}