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A globally scoped variable is invalid throughout the entire program.
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xo_finish_h(3) [freebsd man page]

LIBXO(3)						   BSD Library Functions Manual 						  LIBXO(3)

NAME
xo_emit -- emit formatted output based on format string and arguments LIBRARY
library ``libxo'' SYNOPSIS
#include <libxo/xo.h> void xo_finish(void); void xo_finish_h(xo_handle_t *xop); DESCRIPTION
When the program is ready to exit or close a handle, a call to xo_finish() is required. This flushes any buffered data, closes open libxo constructs, and completes any pending operations. Calling this function is vital to the proper operation of libxo, especially for the non-TEXT output styles. ADDITIONAL DOCUMENTATION
Complete documentation can be found on github: http://juniper.github.io/libxo/libxo-manual.html libxo lives on github as: https://github.com/Juniper/libxo The latest release of libxo is available at: https://github.com/Juniper/libxo/releases SEE ALSO
xo_emit(3) HISTORY
The libxo library was added in FreeBSD 11.0. AUTHOR
Phil Shafer BSD
December 4, 2014 BSD

Check Out this Related Man Page

LIBXO(3)						   BSD Library Functions Manual 						  LIBXO(3)

NAME
xo_emit -- emit formatted output based on format string and arguments LIBRARY
library ``libxo'' SYNOPSIS
#include <libxo/xo.h> typedef void *(*xo_realloc_func_t)(void *, size_t); typedef void (*xo_free_func_t)(void *); void xo_set_allocator(xo_realloc_func_t realloc_func, xo_free_func_t free_func); DESCRIPTION
The xo_set_allocator() function allows libxo to be used in environments where the standard realloc(3) and free(3) functions are not avail- able. realloc_func should expect the same arguments as realloc(3) and return a pointer to memory following the same convention. free_func will receive the same argument as free(3) and should release it, as appropriate for the environment. By default, the standard realloc(3) and free(3) functions are used. ADDITIONAL DOCUMENTATION
Complete documentation can be found on github: http://juniper.github.io/libxo/libxo-manual.html libxo lives on github as: https://github.com/Juniper/libxo The latest release of libxo is available at: https://github.com/Juniper/libxo/releases SEE ALSO
xo_emit(3) HISTORY
The libxo library was added in FreeBSD 11.0. AUTHOR
Phil Shafer BSD
December 4, 2014 BSD

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