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SQLITE_IOCAP_ATOMIC(3) FreeBSD Library Functions Manual NAME SQLITE_IOCAP_ATOMIC, SQLITE_IOCAP_ATOMIC512, SQLITE_IOCAP_ATOMIC1K, SQLITE_IOCAP_ATOMIC2K, SQLITE_IOCAP_ATOMIC4K, SQLITE_IOCAP_ATOMIC8K, SQLITE_IOCAP_ATOMIC16K, SQLITE_IOCAP_ATOMIC32K, SQLITE_IOCAP_ATOMIC64K, SQLITE_IOCAP_SAFE_APPEND, SQLITE_IOCAP_SEQUENTIAL, SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN, SQLITE_IOCAP_POWERSAFE_OVERWRITE, SQLITE_IOCAP_IMMUTABLE, SQLITE_IOCAP_BATCH_ATOMIC - Device Characteristics SYNOPSIS #define SQLITE_IOCAP_ATOMIC #define SQLITE_IOCAP_ATOMIC512 #define SQLITE_IOCAP_ATOMIC1K #define SQLITE_IOCAP_ATOMIC2K #define SQLITE_IOCAP_ATOMIC4K #define SQLITE_IOCAP_ATOMIC8K #define SQLITE_IOCAP_ATOMIC16K #define SQLITE_IOCAP_ATOMIC32K #define SQLITE_IOCAP_ATOMIC64K #define SQLITE_IOCAP_SAFE_APPEND #define SQLITE_IOCAP_SEQUENTIAL #define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN #define SQLITE_IOCAP_POWERSAFE_OVERWRITE #define SQLITE_IOCAP_IMMUTABLE #define SQLITE_IOCAP_BATCH_ATOMIC DESCRIPTION The xDeviceCharacteristics method of the sqlite3_io_methods object returns an integer which is a vector of these bit values expressing I/O characteristics of the mass storage device that holds the file that the sqlite3_io_methods refers to. The SQLITE_IOCAP_ATOMIC property means that all writes of any size are atomic. The SQLITE_IOCAP_ATOMICnnn values mean that writes of blocks that are nnn bytes in size and are aligned to an address which is an integer multiple of nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means that when data is appended to a file, the data is appended first then the size of the file is extended, never the other way around. The SQLITE_IOCAP_SEQUENTIAL property means that information is written to disk in the same order as calls to xWrite(). The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that after reboot following a crash or power loss, the only bytes in a file that were written at the application level might have changed and that adjacent bytes, even bytes within the same sector are guaranteed to be unchanged. The SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN flag indicates that a file cannot be deleted when open. The SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on read-only media and cannot be changed even by processes with elevated privileges. The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying filesystem supports doing multiple write operations atomically when those write operations are bracketed by SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and SQLITE_FCNTL_COMMIT_ATOMIC_WRITE. SEE ALSO sqlite3_io_methods(3), SQLITE_FCNTL_LOCKSTATE(3) FreeBSD 14.1-RELEASE-p8 December 19, 2018 FreeBSD 14.1-RELEASE-p8