DB_MPOOLFILE->get_fileid()
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## DB_MPOOLFILE->get_fileid()

    #include <db.h>

    int
    DB_MPOOLFILE->get_fileid(DB_MPOOLFILE *mpf, u_int8_t *fileid);

The `DB_MPOOLFILE->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 `DB_MPOOLFILE->get_fileid()` method returns a non-zero error value on failure and 0 on success.

### Class

DB_ENV, DB_MPOOLFILE

### See Also

Memory Pools and Related Methods, DB_MPOOLFILE->set_fileid()

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