#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