File: envvars.txt

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===========================
DCMTK ENVIRONMENT VARIABLES
===========================

The behavior of the DCMTK tools and libraries can be modified by a
number of runtime environment variables which are explained below.


DCMDICTPATH
  Affected: dcmdata
  Explanation: On Unix platforms, all DCMTK applications load a DICOM
    data dictionary from file upon startup. By default, the file
    /usr/local/share/dcmtk/dicom.dic will be loaded. If the DCMDICTPATH
    environment variable is set, the applications will attempt to load
    DICOM data dictionaries specified in the DCMDICTPATH environment
    variable instead. The DCMDICTPATH environment variable has the same
    format as the shell PATH variable in that a colon (":") separates
    entries. The data dictionary code will attempt to load each file
    specified in the DCMDICTPATH environment variable. It is an error
    if no data dictionary can be loaded.
      On Win32 platforms, a built-in dictionary is used by default. If
    the DCMDICTPATH environment variable is set, the applications will
    attempt to load _additional_ DICOM data dictionaries specified in
    the DCMDICTPATH environment variable instead. The DCMDICTPATH
    environment variable has the same format as the shell PATH variable
    in that a semicolon (";") separates entries. The data dictionary
    code will attempt to load each file specified in the DCMDICTPATH
    environment variable.

    See also: documentation in dcmdata/docs/datadict.txt or
    /usr/local/share/doc/dcmtk/datadict.txt.

TCP_BUFFER_LENGTH
  Affected: dcmnet
  Explanation: By default, DCMTK does not modify the TCP send and receive
    buffer length, i.e. the operating system is responsible for selecting
    appropriate values. If the environment variable TCP_BUFFER_LENGTH is
    set, it specifies an override for the TCP buffer length. The value is
    specified in bytes, not in Kbytes. If set to 0, a buffer length of 64K,
    which was the default value for previous versions of the DCMTK, is used.

TCP_NODELAY
  Affected: dcmnet
  Explanation: If this environment variable is set and contains a non-zero
    number (e.g. "1"), the Nagle algorithm will be disabled for TCP transport
    connections, which might result in better network performance on some
    systems/environments, especially when many small network packets are to
    be sent. If it is set and contains the number "0", the Nagle algorithm
    will not be disabled. If the environment variable TCP_NODELAY is not set,
    the default behavior applies (see compiler macro DISABLE_NAGLE_ALGORITHM
    in config/docs/macros.txt or /usr/local/share/doc/dcmtk/macros.txt).