## Function: SB-SYS:ENSURE-DYNAMIC-FOREIGN-SYMBOL-ADDRESS
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> Returns the address of the foreign symbol as an integer. On linkage-table
> ports if the symbols isn't found a special guard address is returned instead,
> accesses to which will result in an UNDEFINED-ALIEN-ERROR. On other ports an
> error is immediately signalled if the symbol isn't found. The returned address
> is never in the linkage-table.

### Lambda list
```cl
(symbol &optional sb-alien::datap)
```