XtAppSetFallbackResources(3)

✨ XtAppSetFallbackResources ✨

okay bestie, we're in the XT FUNCTIONS chapter of the manual, and today's main character is XtAppSetFallbackResources — she sets your fallback resources, and she does it with zero drama 💅

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🎀 NAME 🎀

XtAppSetFallbackResources — set fallback resources. that's it, that's the vibe.

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🌸 SYNTAX 🌸

#include <X11/Intrinsic.h>

void XtAppSetFallbackResources(XtAppContext app_context, String*
       specification_list);

no cap, that's the whole signature. copy it exactly, don't get cute with it 🙈

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🦋 ARGUMENTS 🦋

• app_context — specifies the application context. she's the one holding everything together, the group chat admin of your app, fr fr.
• specification_list — specifies a NULL-terminated list of resource specifications used to pre-load the database, or NULL. yes, both are valid. she's flexible like that.

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💖 DESCRIPTION 💖

so here's the tea, bestie. every single entry in specification_list points to a string in the format XrmPutLineResource. (that little detail is important, iykyk.)

after you call XtAppSetFallbackResources, here's what happens: when a resource database is being created for a particular screen, and the Intrinsics cannot find or read an application-specific class resource file — and specification_list is not NULL — then the resource specification in specification_list gets merged into the screen resource database in place of the application-specific class resource file. like, she steps in when the original plan falls through. main character energy, honestly 👑

⚠️ okay important one, don't skip this: XtAppSetFallbackResources is not required to copy specification_list. so the caller — that's you, bestie — must make sure the contents of the list and the strings addressed by the list stay valid until all displays are initialized, or until XtAppSetFallbackResources is called again. if you free that memory early, it's giving undefined chaos 💀

and if you pass the value NULL for specification_list? that removes any previous fallback resource specification for the application context. a little reset, a little clean slate ✨

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. so basically: when the app defaults file goes missing, she's the emergency snack in your bag 🍓

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⭐ SEE ALSO ⭐

• X Toolkit Intrinsics - C Language Interface
• Xlib - C Language X Interface

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X Version 11, libXt 1.3.1, and this lil page is XtAppSetFallbackResources(3). that's the whole manual page bestie, you ate it up, go forth and set those fallbacks 🫶✨💖