fd_r = open(path, O_RDONLY | O_NONBLOCK);
if (fd_r < 0) {
PERROR("open fifo");
- ret = fd_r;
goto error;
}
pipe->fd[0] = fd_r;
fd_w = open(path, O_WRONLY | O_NONBLOCK);
if (fd_w < 0) {
PERROR("open fifo");
- ret = fd_w;
goto error;
}
pipe->fd[1] = fd_w;
unlock_write_side(pipe);
return ret;
}
+
+/*
+ * Return and release the read end of the pipe.
+ *
+ * This call transfers the ownership of the read fd of the underlying pipe
+ * to the caller if it is still open.
+ *
+ * Returns the fd of the read end of the pipe, or -1 if it was already closed or
+ * released.
+ */
+LTTNG_HIDDEN
+int lttng_pipe_release_readfd(struct lttng_pipe *pipe)
+{
+ int ret;
+
+ if (!pipe) {
+ ret = -1;
+ goto end;
+ }
+
+ lock_read_side(pipe);
+ if (!lttng_pipe_is_read_open(pipe)) {
+ ret = -1;
+ goto end_unlock;
+ }
+ ret = pipe->fd[0];
+ pipe->fd[0] = -1;
+ pipe->r_state = LTTNG_PIPE_STATE_CLOSED;
+end_unlock:
+ unlock_read_side(pipe);
+end:
+ return ret;
+}
+
+/*
+ * Return and release the write end of the pipe.
+ *
+ * This call transfers the ownership of the write fd of the underlying pipe
+ * to the caller if it is still open.
+ *
+ * Returns the fd of the write end of the pipe, or -1 if it was alwritey closed
+ * or released.
+ */
+LTTNG_HIDDEN
+int lttng_pipe_release_writefd(struct lttng_pipe *pipe)
+{
+ int ret;
+
+ if (!pipe) {
+ ret = -1;
+ goto end;
+ }
+
+ lock_write_side(pipe);
+ if (!lttng_pipe_is_write_open(pipe)) {
+ ret = -1;
+ goto end_unlock;
+ }
+ ret = pipe->fd[1];
+ pipe->fd[1] = -1;
+ pipe->w_state = LTTNG_PIPE_STATE_CLOSED;
+end_unlock:
+ unlock_write_side(pipe);
+end:
+ return ret;
+}