Struct SolidSyslogBlockDevice¶

ClassList > SolidSyslogBlockDevice

#include <SolidSyslogBlockDeviceDefinition.h>

struct SolidSyslogBlockDevice
{
    bool (*Acquire)(struct SolidSyslogBlockDevice* base, size_t blockIndex);
    bool (*Dispose)(struct SolidSyslogBlockDevice* base, size_t blockIndex);
    bool (*Exists)(struct SolidSyslogBlockDevice* base, size_t blockIndex);
    bool (*Read)(struct SolidSyslogBlockDevice* base, size_t blockIndex, size_t offset, void* buf, size_t count);
    bool (*Append)(struct SolidSyslogBlockDevice* base, size_t blockIndex, const void* buf, size_t count);
    bool (*WriteAt)(
        struct SolidSyslogBlockDevice* base,
        size_t blockIndex,
        size_t offset,
        const void* buf,
        size_t count
    );
    size_t (*Size)(struct SolidSyslogBlockDevice* base, size_t blockIndex);
    size_t (*GetBlockSize)(struct SolidSyslogBlockDevice* base);
};

Detailed Description¶

The block-device extension point: an implementor fills this vtable and embeds it as the first member of its own struct, so_ base _downcasts back to that struct.

Each method's contract is the matching SolidSyslogBlockDevice_* wrapper in SolidSyslogBlockDevice.h. SolidSyslogNullBlockDevice is the "no disk" implementation: every method returns false / 0.

Access is single-threaded, so an implementation need not be reentrant. A true from Append is taken as stored: nothing re-reads or verifies it, and a restart resumes from what Exists and Size report, so a device that answers true before the bytes are durable loses records the store believes it holds. Size is that resume point, not only a fill level.

Public Attributes Documentation¶

Acquire¶

bool(* SolidSyslogBlockDevice::Acquire) (struct SolidSyslogBlockDevice *base, size_t blockIndex);

Append¶

bool(* SolidSyslogBlockDevice::Append) (struct SolidSyslogBlockDevice *base, size_t blockIndex, const void *buf, size_t count);

Dispose¶

bool(* SolidSyslogBlockDevice::Dispose) (struct SolidSyslogBlockDevice *base, size_t blockIndex);

Exists¶

bool(* SolidSyslogBlockDevice::Exists) (struct SolidSyslogBlockDevice *base, size_t blockIndex);

GetBlockSize¶

Fixed per-block capacity; read once at BlockStore construction.

size_t(* SolidSyslogBlockDevice::GetBlockSize) (struct SolidSyslogBlockDevice *base);

Read¶

bool(* SolidSyslogBlockDevice::Read) (struct SolidSyslogBlockDevice *base, size_t blockIndex, size_t offset, void *buf, size_t count);

Size¶

size_t(* SolidSyslogBlockDevice::Size) (struct SolidSyslogBlockDevice *base, size_t blockIndex);

WriteAt¶

bool(* SolidSyslogBlockDevice::WriteAt) (struct SolidSyslogBlockDevice *base, size_t blockIndex, size_t offset, const void *buf, size_t count);

The documentation for this class was generated from the following file Core/Interface/SolidSyslogBlockDeviceDefinition.h