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DbMpoolFile::get_fileid()
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## DbMpoolFile::get_fileid()

    #include <db_cxx.h>

    int DbMpoolFile::get_fileid(u_int8_t *fileid);

The `DbMpoolFile::get_fileid()` method copies the file's identifier into the memory location referenced by fileid. The fileid specifies a unique identifier for the file, which is used so that the cache functions (that is, the shared memory buffer pool functions) are able to uniquely identify files. This is necessary for multiple processes wanting to share a file to correctly identify the file in the cache.

The `DbMpoolFile::get_fileid()` method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

### Class

DbEnv, DbMpoolFile

### See Also

Memory Pools and Related Methods, DbMpoolFile::set_fileid()

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