1.Dd $Mdocdate$ 2.Dt SQLITE_IOCAP_ATOMIC 3 3.Os 4.Sh NAME 5.Nm SQLITE_IOCAP_ATOMIC , 6.Nm SQLITE_IOCAP_ATOMIC512 , 7.Nm SQLITE_IOCAP_ATOMIC1K , 8.Nm SQLITE_IOCAP_ATOMIC2K , 9.Nm SQLITE_IOCAP_ATOMIC4K , 10.Nm SQLITE_IOCAP_ATOMIC8K , 11.Nm SQLITE_IOCAP_ATOMIC16K , 12.Nm SQLITE_IOCAP_ATOMIC32K , 13.Nm SQLITE_IOCAP_ATOMIC64K , 14.Nm SQLITE_IOCAP_SAFE_APPEND , 15.Nm SQLITE_IOCAP_SEQUENTIAL , 16.Nm SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN , 17.Nm SQLITE_IOCAP_POWERSAFE_OVERWRITE 18.Nd Device Characteristics 19.Sh SYNOPSIS 20.Fd #define SQLITE_IOCAP_ATOMIC 21.Fd #define SQLITE_IOCAP_ATOMIC512 22.Fd #define SQLITE_IOCAP_ATOMIC1K 23.Fd #define SQLITE_IOCAP_ATOMIC2K 24.Fd #define SQLITE_IOCAP_ATOMIC4K 25.Fd #define SQLITE_IOCAP_ATOMIC8K 26.Fd #define SQLITE_IOCAP_ATOMIC16K 27.Fd #define SQLITE_IOCAP_ATOMIC32K 28.Fd #define SQLITE_IOCAP_ATOMIC64K 29.Fd #define SQLITE_IOCAP_SAFE_APPEND 30.Fd #define SQLITE_IOCAP_SEQUENTIAL 31.Fd #define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN 32.Fd #define SQLITE_IOCAP_POWERSAFE_OVERWRITE 33.Sh DESCRIPTION 34The xDeviceCharacteristics method of the sqlite3_io_methods 35object returns an integer which is a vector of these bit values expressing 36I/O characteristics of the mass storage device that holds the file 37that the sqlite3_io_methods refers to. 38.Pp 39The SQLITE_IOCAP_ATOMIC property means that all writes of any size 40are atomic. 41The SQLITE_IOCAP_ATOMICnnn values mean that writes of blocks that are 42nnn bytes in size and are aligned to an address which is an integer 43multiple of nnn are atomic. 44The SQLITE_IOCAP_SAFE_APPEND value means that when data is appended 45to a file, the data is appended first then the size of the file is 46extended, never the other way around. 47The SQLITE_IOCAP_SEQUENTIAL property means that information is written 48to disk in the same order as calls to xWrite(). 49The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that after reboot 50following a crash or power loss, the only bytes in a file that were 51written at the application level might have changed and that adjacent 52bytes, even bytes within the same sector are guaranteed to be unchanged. 53The SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN flag indicate that a file cannot 54be deleted when open. 55.Sh SEE ALSO 56.Xr sqlite3_io_methods 3 57