Sets the state of the protocols table.
    Format
      #include  <netdb.h>
      void setprotoent  (int stay_open);

1  –  Argument

 stay_open
    Specifies a value used to indicate when to reset the protocols
    table index:
    o  A value of 0 resets the protocols table index after each call
       to the getprotoent function.
    o  A nonzero value does not reset the protocols table index after
       each call.

2  –  Description

    This function sets the index marker to the beginning of the
    protocols table.
    Passing a nonzero stay_open argument will allow the index to
    advance until you call the endprotoent() or exit()  function.
    Related Functions
    See also endprotoent(), exit(),  and getprotoent().

3  –  Return Values

    1                  Indicates success.
    0                  Indicates an error; unable to access the
                       protocols table.