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CentOS 7.0 - man page for xkballocgeomkeys (centos section 3)

XkbAllocGeomKeys(3)				    XKB FUNCTIONS				  XkbAllocGeomKeys(3)

XkbAllocGeomKeys - Allocate space for an arbitrary number of keys to a row
Status XkbAllocGeomKeys (XkbRowPtr row, int num_needed);
- row row to which keys should be allocated - num_needed number of new keys required
Xkb provides a number of functions to allocate and free subcomponents of a keyboard geometry. Use these func- tions to create or modify keyboard geometries. Note that these functions merely allocate space for the new element(s), and it is up to you to fill in the values explicitly in your code. These allocation functions increase sz_* but never touch num_* (unless there is an allocation failure, in which case they reset both sz_* and num_* to zero). These functions return Success if they succeed, BadAlloc if they are not able to allocate space, or BadValue if a parameter is not as expected. XkbAllocGeomKeys allocates num_needed keys and adds them to the row. No initialization of the keys is done.
BadAlloc Unable to allocate storage BadValue An argument is out of range X Version 11 libX11 1.6.0 XkbAllocGeomKeys(3)

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