/usr/include/ffindex_posix_search.h is in libffindex0-dev 0.9.9.7-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #include <ffindex.h>
ffindex_index_t* ffindex_index_as_tree(ffindex_index_t* index);
ffindex_index_t* ffindex_tree_unlink(ffindex_index_t* index, char* name_to_unlink);
int ffindex_tree_write(ffindex_index_t* index, FILE* index_file);
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