---
name: "XtAppSetFallbackResources"
section: "3"
platform: "linux"
package: "libxt"
version: "1.3.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/XtAppSetFallbackResources"
---

# XtAppSetFallbackResources(3)

set fallback resources

## NAME

XtAppSetFallbackResources - set fallback resources

## SYNTAX

\#include \<X11/Intrinsic.h\>

void XtAppSetFallbackResources(XtAppContext *app\_context*, String\* *specification\_list*);

## ARGUMENTS

- *app\_context*

  Specifies the application context.

- *specification\_list*

  Specifies a NULL-terminated list of resource specifications to pre-load the database, or NULL.

## DESCRIPTION

Each entry in *specification\_list* points to a string in the format **XrmPutLineResource**. following a call to **XtAppSetFallbackResources**, when a resource database is being created for a particular screen and the Intrinsics are not able to find or read an application-specific class resource file and if *specification\_list* is not NULL the resource specification in *specification\_list* will be merged into the screen resource database in place of the application-specific class resource file. **XtAppSetFallbackResources** is not required to copy *specification\_list*; the caller must ensure that the contents of the list and the strings addressed by the list remain valid until all displays are initialized or until **XtAppSetFallbackResources** is called again. The value NULL for *specification\_list* removes any previous fallback resource specification for the application context. The intended use for fallback resources is to provide a minimal number of resources that will make the application usable (or at least terminate with helpful diagnostic messages) when some problem exists in finding and loading the application defaults file.

## SEE ALSO

*X Toolkit Intrinsics - C Language Interface*\
 *Xlib - C Language X Interface*