int sqlite3_vtab_on_conflict(sqlite3 *);
This function may only be called from within a call to the xUpdate method of a virtual table implementation for an INSERT or UPDATE operation. The value returned is one of SQLITE_ROLLBACK, SQLITE_IGNORE, SQLITE_FAIL, SQLITE_ABORT, or SQLITE_REPLACE, according to the ON CONFLICT mode of the SQL statement that triggered the call to the xUpdate method of the virtual table.
See also lists of Objects, Constants, and Functions.
SQLite is in the Public Domain.
https://sqlite.org/c3ref/vtab_on_conflict.html