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int sqlite3_system_errno(sqlite3*);
R-57019-29874:[Attempt to return the underlying operating system error code or error number that caused the most recent I/O error or failure to open a file. ] The return value is OS-dependent. For example, on unix systems, after sqlite3_open_v2() returns SQLITE_CANTOPEN, this interface could be called to get back the underlying "errno" that caused the problem, such as ENOSPC, EAUTH, EISDIR, and so forth.
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