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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