Understanding the Diagnostic Subsystem for AIX

 typedef struct _log_info {
    int fd;                            /* File descriptor                   */
    int lockId;                        /* ODM Lock id                       */
    dl_att *dlAtt;                     /* Pointer to log attributes         */
    dl_einfo *dlArray;                 /* Pointer to log array              */
} dl_info;

typedef struct _log_einfo {
    int version;                       /* Entry Version                     */
    char logType;                      /* Log Type - I,S,N,E,X              */
    unsigned int size;                 /* Entry Size                        */
    unsigned int offset;               /* Offset from the file's beginning  */
} dl_einfo;

typedef struct _log_att {
    int version;                       /* Version                           */
    unsigned int numEntries;           /* number of log entried             */
    unsigned int lastIndex;            /* index of latest entry             */
    unsigned int nextSeqNum;           /* sequence number of next log entry */
    unsigned int maxLogSize;           /* maximum size of log               */
    unsigned int arrayOffset;          /* array offset                      */
    unsigned int wrapCount;            /* number of times file has wrapped  */
} dl_att;