use fopencookie to avoid leaking FILE structs

If we use fdopen for stdin/out/err we cannot close it to free the file struct
without also closing the file descriptor. If fopencookie is available, use that
to wrap the file descriptor, but allow closing without closing the fd. This is
useful when embedding in long running programs.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/input.h b/src/input.h
index 8cb20088..1d86a11b 100644
--- a/src/input.h
+++ b/src/input.h
@@ -193,6 +193,12 @@ struct stream_impl_data
 	char *name;
 	FILE *file;
 
+	// There is one condition when we don't want to close the FILE struct. If
+	// there is no fopencookie available, we need to use fdopen to wrap FD 0, 1
+	// and 2. However, closing those also closes the file descriptor, and when
+	// a colm program is embedded in a bigger program, we don't want that.
+	int no_file_close;
+
 	struct colm_str_collect *collect;
 
 	int consumed;