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Other environment variable functions
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Besides getenv (retrieve environment variable), two more environment variable functions are available:
  1. contlen
    2. This procedure returns as a 4 byte integer the contents of the CONTENT_LENGTH environment variable. This environment variable contains the number of characters of the input string (query string) when the POST method is used. Example: 
     * Variables common to all CGIs
 /copy mysrclib/qrpglesrc,prototypeb
 /copy mysrclib/qrpglesrc,usec
 /copy mysrclib/qrpglesrc,variables3
 *          ... etc. ...
 * Retrieve query string length
C                   eval      inactln = contlen


  2. putenv
    3. In some circumstances, one may need to change the value of an existing environment variable, or to create a new environment variable.
    This is useful for communication between programs running in the same job, such as your program and the Net.Data language environment.
    Example: 
     * Variables common to all CGIs
 /copy mysrclib/qrpglesrc,prototypeb
 /copy mysrclib/qrpglesrc,usec
 /copy mysrclib/qrpglesrc,variables3
 *          ... etc. ...
 * Set to blank environment variable QUERY_STRING
C                   callp     putenv('QUERY_STRING=':qusec)