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VxWorks notes
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## VxWorks notes

Berkeley DB currently disallows the DB_TRUNCATE flag to the DB->open() method on VxWorks because the operations this flag represents are not fully supported under VxWorks.

The DB->sync() method is implemented using an ioctl call into the file system driver with the FIOSYNC command. Most, but not all file system drivers support this call. Berkeley DB requires the use of a file system that supports FIOSYNC.

### Building and Running the Demo Program

The demo program should be built in a manner very similar to building Berkeley DB. If you want different or additional BSP build specifications you should add them by following the directions indicated in Building for VxWorks 6.x.

The demo program can be downloaded and run by calling the entry function dbdemo with the pathname of a database to use. The demo program will ask for some input keys. It creates a database and adds those keys into the database, using the reverse of the key as the data value. When complete you can either enter EOF (control-D) or quit and the demo program will display all of the key/data items in the database.

### Building and Running the Utility Programs

The Berkeley DB utilities can be downloaded and run by calling the function equivalent to the utility's name. The utility functions take a string containing all the supported arguments. The program will then decompose that string into a traditional argc/argv used internally. For example, to execute db_stat utility on a database within an environment you would execute the following from the windsh prompt. Obviously you would change the pathname and database name to reflect your system.

    > db_stat "-h /tmp/myenvhome -d mydatabase.db"

### Support for Replication Manager

The Berkeley DB Replication Manager component is available on Vxworks 6.x because it provides support for TCP/IP sockets and POSIX 1003.1 style networking and threads. You must build Berkley DB for Vxworks using the command line. Prior to building Berkeley DB, ensure you set appropriate values for the variables specified in Step 1 of Building for VxWorks 6.x. To use Berkeley DB Replication Manager, `netLib` and `ioLib` must be present in the Vxworks image.

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