INTEGER FUNCTION SBREAK (X)
C
C     ****************************************************************
C
C              KERMIT for the MODCOMP MAXIV operating system
C
C        Compliments of:
C
C                         SETPOINT, Inc.
C                      10245 Brecksville Rd.
C                      Brecksville, Ohio 44141
C
C
C      KERMIT is a copyrighted protocol of Columbia Univ. The authors
C      of this version hereby grant permission to copy this software
C      provided that it is not used for an explicitly commercial
C      purpose and that proper credit be given. SETPOINT, Inc. makes
C      no warranty whatsoever regarding the accuracy of this package
C      and will assume no liability resulting from it's use.
C
C     ****************************************************************
C
C     Abstract:  Send a BREAK packet to signify the end of
C                transmissions
C
C     MODIFICATION HISTORY
C
C     BY            DATE     REASON            PROGRAMS AFFECTED
C
C     ****************************************************************
C
C     Author:  Rick Burke           Version:  A.0   Date: Sep-86
C
C     Calling Parameters:
C
C     R    X            - Dummy argument required by FORTRAN
C
C     ****************************************************************
C
C     Messages generated by this module :  None
C
C     ****************************************************************
C
C     Subroutines called directly : MOD, RPACK, SPACK
C
C     ****************************************************************
C
C     Files referenced :  None
C
C     ****************************************************************
C
C     Local variable definitions :
C
C     LEN          - Length of response packet
C     NUM          - Packet number of response
C     STATUS       - Status of response packet
C     TV1          - Temporary variable
C     TV2          - Temporary variable
C     TV3          - Temporary variable
C
C     ****************************************************************
C
C     Commons referenced :  None
C
C     ****************************************************************
C
C     (*$END.DOCUMENT*)
C
C     ****************************************************************
C     *                                                              *
C     *         D I M E N S I O N   S T A T E M E N T S              *
C     *                                                              *
C     ****************************************************************
C
      IMPLICIT INTEGER (A-Z)
C
C     ****************************************************************
C     *                                                              *
C     *         T Y P E   S T A T E M E N T S                        *
C     *                                                              *
C     ****************************************************************
C
C
C     ****************************************************************
C     *                                                              *
C     *         C O M M O N   S T A T E M E N T S                    *
C     *                                                              *
C     ****************************************************************
C
      INCLUDE USL/UFTTBC
      INCLUDE USL/KERCOM
      INCLUDE USL/KERPMC
C
C     ****************************************************************
C     *                                                              *
C     *         E Q U I V A L E N C E   S T A T E M E N T S          *
C     *                                                              *
C     ****************************************************************
C
C
C     ****************************************************************
C     *                                                              *
C     *         D A T A   S T A T E M E N T S                        *
C     *                                                              *
C     ****************************************************************
C
C
C     ****************************************************************
C
C     Code starts here :
C
C----->  Assume some kind of error.
C
      SBREAK = BIGA
C
C----->  Check whether retry counter exceeded.
C
      IF (NUMTRY .GT. MAXTRY) RETURN
      NUMTRY = NUMTRY + 1
C
C----->  Send BREAK packet and get the response.
C
      TNUM = N
      TV1 = BIGB
      TV2 = 0
      TV3 = 0
      CALL SPACK (TV1,TNUM,TV2,TV3)
      STATUS = RPACK (LEN,NUM,RECPKT)
C
C----->  Branch if response was not a NAK.
C
      IF (STATUS .NE. BIGN) GO TO 10
      IF (N .NE. NUM-1) SBREAK = STATE
      RETURN
   10 CONTINUE
C
C----->  Branch if response was not an ACK.
C
      IF (STATUS .NE. BIGY) GO TO 30
      IF (N .EQ. NUM) GO TO 20
      SBREAK=STATE
      RETURN
   20 CONTINUE
C
C----->  Received good ACK to BREAK packet so reset retry counter,
C----->  bump packet counter, and set the state to "C" (complete).
C
      NUMTRY = 0
      N = MOD (N+1,64)
      SBREAK = BIGC
C
C---->  If we're in HOST mode, terminate the binary read outstanding
C
      IF(HOSTON .EQ. NO)GO TO 25
C
      CALL TERMIN(IUFT(1,4),.FALSE.)
C
   25 CONTINUE
      RETURN
   30 CONTINUE
C
C-----> Handle BAD status or unknown or ERROR packet types.
C
      IF (STATUS .EQ. BAD) SBREAK = STATE
      RETURN
      END