X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fpipe.c;h=52ee08a978e5a3a1f9b8ecd45b697b7106956120;hp=c8f00141574c3a6f11ce278a4c4a07d9cad1fa46;hb=287a512f2b868c16132b894a8143a5faf0379ca8;hpb=9c2bd8db1c70269d37537b7d02bae41ccab29056

diff --git a/src/common/pipe.c b/src/common/pipe.c
index c8f001415..52ee08a97 100644
--- a/src/common/pipe.c
+++ b/src/common/pipe.c
@@ -404,3 +404,69 @@ error:
 	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;
+}