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     The dosexterr function obtains the extended error information
     returned by the DOS system call 0x59 and stores the values in the
     structure pointed to by <errorinfo>. This function is useful when
     making system calls under DOS versions 3.0 or later, which offer
     extended error handling.
 
     The structure type DOSERROR is defined in DOS.H.
 
     Giving a NULL pointer argument causes dosexterr to return the
     value in AX without filling in the structure fields.
 
     Return Value
 
     The dosexterr function returns the value in the AX register
     (identical to the value in the exterror structure field).
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