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|
<pre>Network Working Group M. Krilanovich
Request for Comments: 119 UCSB
NIC: 5831 April 21, 1971
<span class="h1">NETWORK FORTRAN SUBPROGRAMS</span>
Preface
The subroutines described in this document have been implemented at
UCSB and make the Network (via the NCP) accessible to Fortran
programs executing in the 360/75. They are callable from within any
Fortran main program or subroutine compiled at UCSB.
<span class="grey">Krilanovich [Page 1]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-2" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
A set of assembly-language written subprograms is provided to
facilitate the sue of the Network by FORTRAN programmers. They serve
as an interface between the user and the Network Control Program
(NCP), which supervises all Network operations at this site.
A concept fundamental to FORTRAN Network operations is that of a
completion code variable. Associated with each socket that is not in
the closed state is a unique variable, called a completion code
variable. This variable serves two purposes: it identifies the local
socket referenced, and upon completion of the operation it contains a
completion code to indicate the outcome of the operation to the
programmer. It may be used at any time for any purpose other than
network operations. Its value at the beginning of a Network
operation is immaterial; rather it is the variable itself that is
important. In all Network operations, whenever a completion code
variable is called for, the only acceptable type variable is
INTERGER*4.
In general, the subprograms will initiate the operation, and enter
the WAIT state (consume no CPU time) until notified by the NCP of the
completion of the operation. For such operations, the programmer
supplies a time limit, of type INTERGER*4, which specifies, in tenths
of a second, the maximum length of time the subprogram is to wait for
the operation to complete. If this time limit is exceeded, a
completion code is supplied to indicate the error; and control is
returned to the calling program, with the operation still pending.
In those operations requiring a socket to be specified by its socket
identifier, the following format is used. The identifier is
specified as a INTEGER*4 array with at least two elements, or an
element of such an array. The first element specified is taken to be
the site number, and the next element the socket number. A socket
number may have any value, positive, negative, or zero. Since
negative numbers are represented internally in two's complement form,
for the purposes of the gender of a socket, a socket number is even
for odd according to whether its absolute value is even or odd,
respectively.
Following is a description of each subprogram, its function and
calling sequence.
(1) OPEN
By invoking this subprogram, the user requests that the specified
local socket be removed from the closed state and thus be
prepared to participate in data transfer. There are three
distinct operations that can be performed by this subprogram, and
these are described below:
<span class="grey">Krilanovich [Page 2]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-3" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
(A) CONNECT
By initiating this operation, the user requests that the
specified local socket be logically connected to the
specified foreign socket, and that data transfer between the
two sockets be enabled. The subprogram will wait until the
foreign socket either accepts or rejects the connection
attempt. This operation is valid only when the local socket
is in the closed state.
The calling sequence is as follows:
CALL OPEN (cmpcd, time, lclsck, fgnsck, ws)
where
'cmpcd' is the completion code variable to be associated
with the local socket.
'time' is the length of time the subprogram is to wait
for the completion of the operation.
'lclsck' is the socket identifier of the local socket.
'fgnsck' is the socket identifier of the foreign socket.
'ws' is a workspace, which as the same attributes as a
socket identifier, and, if the operation is
successful, will become associated with the local
socket for the life of the connection. In response
to certain future operations, information may be
returned to the programmer in this workspace.
The following completion codes are possible for this
operation:
0, The operation was successful and the connection
has been established
4, The specified completion code variable is
already assigned to a socket; the operation was
suppressed
8, The specified local socket is not in the closed
state; the operation was suppressed
12, All communication paths to the specified foreign
site are in use; the operation was suppressed
<span class="grey">Krilanovich [Page 3]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-4" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
16, Local resources are insufficient to support
another connection; the operation was suppressed
20, The connection attempt was rejected by the
foreign process
24, The specified local socket is not local to UCSB;
the operation was suppressed
28, The specified foreign site is invalid; the
operation was suppressed
32, An addressing or protection exception was
encountered with respect to the specified
workspace; the operation was suppressed
36, Either hardware at the foreign site is
inoperative or the NCP's counterpart at the
foreign site does not exist or has failed
40, Local and foreign sockets are both either send
or receive sockets; the operation was suppressed
44, By operator command, all Network operations were
terminated; the socket will be closed
60, An NCP control transmission error occurred; the
operation was suppressed
252, The specified time limit was exceeded; the
operation was initiated but not completed
(B) LISTEN
This operation is a request for notification of any
connection attempt directed toward the specified local
socket. The subprogram waits until such a call is received,
at which time the calling processes' socket identifier is
returned to the calling program. This operation is valid
only when the designated local socket is in the closed state.
The calling sequence is as follows:
CALL OPEN (cmpcd, time, lclsck, ws)
Where
'cmpcd' is the completion code variable to be associated
with the local socket.
<span class="grey">Krilanovich [Page 4]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-5" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
'time' is the length of time the subprogram is to wait
for the completion of the operation.
'lclsck' is the socket identifier of the local socket.
'ws' is a workspace which, if the operation is
successful, will contain the socket identifier of
the calling socket, and will become associated with
the local socket for the life of the connection.
'ws' has the same attributes as a socket
identifier.
The following completion codes are possible for this
operation:
0, The operation was successful and a call has been
received
4, The specified completion code variable is
already assigned to a socket; the operation was
suppressed
8, The specified local socket is not in the closed
state; the operation was suppressed
12, Local resources are insufficient to support
another connection; the operation was suppressed
16, The specified local socket is not local to UCSB;
the operation was suppressed
20, An addressing or protection exception was
encountered with respect to the specified
workspace; the operation was suppressed
44, By operator command, all Network operations were
terminated; the socket will be closed
252, The specified time limit was exceeded; the
operation was initiated but not completed
(C) ACCEPT
This operation accepts connection with the foreign socket
whose call caused successful completion of a previous LISTEN
operation by the specified local socket. After completion of
this operation, data may be transferred to or from the local
socket, depending on its gender. This operation is valid
<span class="grey">Krilanovich [Page 5]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-6" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
only when the last operation referencing the local socket was
a LISTEN operation. The subprogram will wait until the
operation is completed.
The calling sequence is as follows:
CALL OPEN (cmpcd, time)
Where
'cmpcd' is the completion code variable associated with
the local socket by a previous LISTEN operation.
'time' is the length of time the subprogram is to wait
for the completion of the operation
The following completion codes are possible for this
operation:
0, The operation was successful, and the connection
is established
4, The specified local socket is in the closed
state 9The NCP may have received an abort
notification from the foreign process); the
operation was suppressed
8, the previous operation specifying the designated
local socket was not a LISTEN; the operation was
suppressed
12, All communication paths to the specified foreign
site are in use; the socket has been returned to
the closed state
252, the specified time limit was exceeded; the
operation was initiated but not completed
(2) CLOSE
This operation is a request that the specified local socket be
returned to the closed state. If the last operation involving
this socket was a LISTEN, this operation refuses the foreign
process' connection attempt. If the last operation was CONNECT,
the attempt is aborted. If a connection is established, any data
in transit from the local socket is allowed to reach the foreign
socket to be either received or flushed before the local socket
is closed. The subprogram will wait until the socket has been
returned to the closed state.
<span class="grey">Krilanovich [Page 6]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-7" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
The calling sequence is as follows:
CALL CLOSE (cmpcd, time)
Where
'cmpcd' is the completion code variable associated with
the local socket.
'time' is the length of time the subprogram is to wait
for the completion of the operation.
The following completion codes are possible for this operation:
0, the operation was successful, and the socket has
been returned to the closed state
8, The specified completion code variable is not
currently assigned to a socket; the operation
was suppressed
12, The specified local socket is in the process of
being closed; the operation was suppressed, but
the local socket will be closed
36, Either hardware at the foreign site is
inoperative, or the NCP's counterpart at the
foreign site does not exist or has failed
<span class="grey">Krilanovich [Page 7]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-8" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
44, By operator command, all Network operations were
terminated; the socket will be closed
60, An NCP control transmission error occurred; the
operation was aborted
64, A transmission error occurred; the operation was
aborted, but the socket will be closed
252, The specified time limit was exceeded; the
operation was initiated but not completed
3) SEND
This program causes data to be sent to the foreign socket. The
subprogram will wait until the data has been received by the
foreign socket, or until it has been queued locally by the NCP.
The calling sequence is as follows:
CALL WRITE (cmpcd, bfr, len, time [,offset])
Where
'cmpcd' is the completion code variable associated with
the local socket.
'bfr' is the data to be sent, and can be of any type,
any length.
'len' is the number of bits of data to be sent. If
'len' is non-positive, no operation is performed.
'len' is of type INTEGER*4.
'time' is the length of time the subprogram is to wait
for the completion of the operation.
'offset' is the bit offset from the first bit of 'bfr'
at which data transmission is to begin, and is of
type INTEGER*4. If not specified, 'offset'
defaults to zero.
The following completion codes are possible for this operation:
0, The operation was successful, and the data has
been sent
4, The specified local socket is not a send socket;
the operation was suppressed
<span class="grey">Krilanovich [Page 8]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-9" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
8, The specified completion code variable is not
assigned to a socket; the operation was
suppressed
12, A previous send operation is in progress; the
operation was suppressed
16, The connection is not fully open; the operation
was suppressed
20, The foreign socket terminated the connection
before completion of the send operation; not all
the data was transmitted
36, Either hardware at the foreign site is
inoperative, or the NCP's counterpart at the
foreign site does not exist or has failed
44, By operator command, all Network operations were
terminated; the socket will be closed
52, One or more interrupts were received from the
foreign socket; the operation was suppressed
56, An addressing exception was encountered with
respect to the data buffer; the operation was
suppressed
60, An NCP control transmission error occurred; the
operation was aborted and the socket will be
closed
64, A transmission error occurred; the operation was
aborted and the socket will be closed
252, The specified time limit was exceeded; the
operation was initiated but not completed
4) RECEIVE
This operation causes data to be received from the foreign
socket. The subprogram will wait until the reception of data is
complete.
The calling sequence is as follows:
CALL READ (cmpcd, bfr, len, time [,offset])
<span class="grey">Krilanovich [Page 9]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-10" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
Where
'cmpcd' is the completion code variable associated with
the local socket.
'bfr' is the variable into which the data is to be
placed, and can be of any type, any length.
'len' is the number of bits of data to be received. If
'len' is non-positive, no operation is performed.
'len' is of type INTEGER*4.
'time' is the length of time the subprogram is to wait
for the completion of the operation.
'offset' is the bit offset from the first bit of 'bfr'
at which the first bit of data is to be placed, and
is of type INTEGER*4. If not specified, the
'offset' defaults to zero.
The following completion codes are possible for this operation:
0, The operation was successful and the data has
been received
4, The specified local socket is not a receive
socket; the operation was suppressed
8, The specified completion code variable is not
assigned to a socket; the operation was
suppressed
12, A previous receive operation is in process; the
operation was suppressed
16, The connection is not fully open; the operation
was suppressed
20, The foreign socket terminated the connection
before completion of the receive operation; data
is unpredictable
24, An addressing or protection exception was
encountered with respect to the data buffer; the
operation was suppressed
36, Either hardware at the foreign site is
inoperative, or the NCP's counterpart at the
foreign site does not exist or has failed
<span class="grey">Krilanovich [Page 10]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-11" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
44, By operator command, all network operations were
terminated; the socket will be closed
52, One or more interrupts were received from the
foreign socket; the operation was suppressed
60, An NCP control transmission error occurred; the
operation was suppressed and the socket will be
closed
252, the specified time limit was exceeded; the
operation was initiated but not completed
5) CHECK
This operation causes the status of the specified local socket to
be returned. There is no completion code variable associated
with this operation, since it is always successful and the socket
is identified by its socket number. This operation is valid at
any time and is always completed immediately.
The calling sequence is as follows:
CALL CHECK (lclsck, stat, menu, fgnsck, deficit)
Where
'lclsck' is the socket identifier of the local socket.
'stat' is a code for the status, and is of type
INTEGER*4.
'mnem' is a mnemonic for the status, and can be of any
type, of any length greater than or equal to eight
bytes.
'fgnsck' is the socket identifier of the foreign socket,
or zero.
'deficit' is the send/receive deficit in bits, or zero,
and is to type INTEGER*4.
'lclsck' is the only argument the programmer need
define; the others are output from the subprogram.
<span class="grey">Krilanovich [Page 11]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-12" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
'STAT' 'MNEM' MEANING
------ ------ ---------
0 OPEN A connection is fully established. No
SEND/RECEIVE operation is in progress.
'fgnsck' is the socket identifier of the
connected socket. 'deficit' is the number of
bites queued locally at the socket by the NCP
and available to satisfy a future RECEIVE
operation, or awaiting output ads the results
of a previous SEND operation.
1 LISTEN A LISTEN has been issued.
2 CONNECT A CONNECT has been issued. 'fgnsck' is the
socket identifier of the foreign socket.
3 DECISION A LISTEN has been completed. 'fgnsck' is
the socket identifier of the calling socket.
4 CALL(S) One or more calls have been received for the
local socket. No LISTEN or CONNECT has been
issued.
5 I/O A connection is fully established. A
SEND/RECEIVE operation is in progress.
'fgnsck' is the socket identifier of the
connected socket. 'deficit' is the number
of bits yet to be sent or received.
6 CLOSED The socket is in the closed state.
7 <--DRAIN The foreign socket is attempting to close the
connection. The NCP has data yet to be ready
by the local socket. 'fgnsck' is the socket
identifier of the connected socket.
'deficit' is the number of bits yet to be
received.
8 DRAINED The foreign socket is attempting to close the
connection. The NCP is awaiting arrival at
the foreign site of data currently in
transit. 'fgnsck' is the socket identifier
of the connected socket.
9 CLOSING The local socket has issued a CLOSE. The NCP
is in the process of returning the local
socket to the closed state. 'fgnsck' is the
socket identifier of the connected socket.
<span class="grey">Krilanovich [Page 12]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-13" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
10 DRAIN--> The local socket has issued a CLOSE. The NCP
is completing the last SEND operation before
returning the local socket to the closed
state. 'fgnsck' is the socket identifier
of the connected socket. 'deficit' is the
number of bits the NCP has yet to transmit.
(6) IDENTIFY
This operation is used to identify a local socket by its
completion code variable. The operation is valid at any time,
and is always completed immediately. Since it is always
successful, there are no completion codes for the operation, and
the contents of the completion code variable are not changed.
The calling sequence is as follows:
CALL ID (cmpcd, lclsck)
Where
'cmpcd' is the completion code variable associated with
the local socket.
'lclsck' is set to the socket identifier of the local
socket if the completion code variable is
associated with a socket, or to zero otherwise.
(7) SIGNAL
This operation is used to convey a signal to the foreign process.
The significance of the signal is completely user-dependent. The
effect is that the next time the foreign socket attempts to
initiate a RECEIVE or SEND operation, the operation will be
suppressed, and a completion code supplied indicating that a
signal had been received. The subprogram will wait until the
signal has been sent to the foreign NCP. This operation is valid
only when the socket is fully open.
The calling sequence is as follows:
CALL SIGNAL (cmpcd, time)
Where
'cmpcd' is the completion code variable associated with
the local socket.
'time' is the length of time the subprogram is to wait
for completion of the operation.
<span class="grey">Krilanovich [Page 13]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-14" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
The following completion codes are possible for this operation:
0, The operation was successful, and the signal has
been sent
4, The specified completion code variable is not
assigned to a socket; the operation was
suppressed
8, The connection is not fully open; the operation
was suppressed
Certain of the Network subprograms are intended for, although not
restricted to, use with the Online System Network operators. The
following is a general description of these operators:
In all Network operations involving the Online System Network
operators, there are certain conventions concerning the format
of the data sent and received. The data is grouped in
'messages' consisting of three fields, op code, length, and
text, in that order. The op code is one byte in length and is
a code which indicates how the text field is to be
interpreted. The length field is two bytes long, and gives
the length, in bits, of the text fields, which contains the
actual data. (The op code and length fields together are
termed a header.)
<span class="grey">Krilanovich [Page 14]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-15" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
The following op codes are presently defined:
Op Code Meaning
0 This op code is a NOP. No text field exists, and the
contents of the length field are unpredictable. (This
op code is used mainly as a delimiter.)
1 The text field contains EBCDIC characters, one
character per byte. The Online System operators
consider the characters as intended for display as soon
as the text field has been received.
2 The text contains codes for keypushes, one byte per
key. The Online operators consider the keys as
intended for execution as soon as the text field has
been received.
3 The same as for an op code of 2, except that the Online
operators consider that the execution of the keys will
be delayed until all data for that receive operations
has been received.
The standard format of data sent or received by the Online System
operators is a string of messages, with the last message
indicated by a header with a NOP op code, called a trailer.
These conventions are the default situation; any of them may be
overridden by appropriate programming.
Following are descriptions of those subprograms intended for use
the Online System operators.
(8) WRITE TO ONLINE CONSOLE
This subprogram causes data, assumed to be characters represented
by their EBCDIC codes, to be sent from the specified local
socket. The characters are sent in a standard message, preceded
by a header, and optionally followed by a trailer. The
subprogram waits for the data to be received by the foreign
socket, or to be queued locally by the NCP. This operation is
valid only when the local socket is a send socket, and is fully
open.
<span class="grey">Krilanovich [Page 15]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-16" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
The calling sequence is as follows:
CALL WTOLC (cmpcd, bfr, len, level, across, down, time)
Where
'cmpcd' is the completion code variable associated with
the local socket.
'bfr' is the character string to be sent, and can be of
any type, any length.
'len' in absolute value, is the number of characters to
be sent. If 'len' is positive or zero, the end of
the data is indicated by a trailer; if 'len' is
negative, no trailer is sent. 'len' is of type
INTEGER*4.
'level' indicates the mode of typing. The absolute
value of 'level', if non-zero, is the shift level
on which to type, and must be less than or equal to
nine. If greater than nine, one is sued. If
'level' is positive, 'across' and 'down' are
relative to the current typing location. If
'level' is negative, the carriage is positioned to
the upper left-hand corner before typing begins,
thus making 'across' and 'down' absolute
coordinates. If 'level' is zero, the tying is in
case one characters, and a carriage return precedes
the positioning for 'across' and 'sown.' If the
characters to be displayed are case one characters,
the header sent will have an op code which
indicates characters to be displayed as soon as
they are received; otherwise, the op code will
indicate buttons to be executed as soon as
received. 'level' is of type INTEGER*4.
'across' is the number of spaces to be moved
horizontally across the display tube before
beginning to type. 'across' can have any value,
positive, negative, or zero, and is type INTEGER*4.
'time' is the length of time the subprogram is to wait
for completion of the operation.
The completion codes for this operation are the
same as for SEND.
<span class="grey">Krilanovich [Page 16]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-17" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
(9) READ FROM ONLINE CONSOLE
This subprogram receives data, assumed to be characters
represented by their EBCDIC codes, from the foreign socket in one
or more standard messages. The subprogram will wait for the
data, optionally followed by a trailer, to be received by the
local socket. This operation is valid only when the local socket
is a receive socket and is fully open.
The calling sequence is as follows:
CALL RFOLC (cmpcd, bfr, len, time)
Where
'cmpcd' is the completion code variable associated with
the local socket.
'bfr' is the variable into which the data is to be
placed, and can be of any type, any length.
'len', in absolute value, is the maximum number of
characters to be placed in 'bfr'. If the length
fields of the head(s) received total more data than
'len', the excess data will be received, but will
not placed into 'brf', and will not be accessible
to the program. If 'len' is positive or zero, data
will be received until a trailer is encountered.
If 'len' is negative, a single message, exclusive
of trailer, will be received. 'len' is of type
INTEGER*4.
'time' is the length of time the subprogram is to wait
for completion of the operation.
The completion codes for this operation are the
same as for RECEIVE.
(10) WRITE TO ONLINE CONSOLE WITH REPLY
This subprogram combines the functions of 'WRITE TO ONLINE
CONSOLE' and 'READ FROM ONLINE CONSOLE'. The subprogram first
sends a string of data to the foreign socket form the specified
send socket, waits for it to be received by the foreign socket
(or queued locally by the NCP), and then waits for a reply
directed toward the specified receive socket. The operation is
valid only when the sockets have the correct gender and both are
fully open.
<span class="grey">Krilanovich [Page 17]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-18" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
The calling sequence is as follows:
CALL WTOLCR (cmpcd, bfr, len, level, across, down, time,
cmpcd2, bfr2, len2)
Where
'cmpcd' is the completion code variable associated with
the local send socket.
'bfr' is as in 'WRITE TO ONLINE CONSOLE'.
'len' is as in 'WRITE TO ONLINE CONSOLE'.
'level' is an in 'WRITE TO ONLINE CONSOLE'.
'across' as in 'WRITE TO ONLINE CONSOLE'.
'down' is as in 'WRITE TO ONLINE CONSOLE'.
'time' is the length of time the subprogram is to wait
for completion, individually, of the transmission
and reception of data.
'cmpcd2' is the completion code variable associated with
the local receive socket.
'brf2' is as 'bfr' in 'READ FROM ONLINE CONSOLE'.
'len2' is as 'len' in 'READ FROM ONLINE CONSOLE'.
The completion codes for the send socket are the
same as for the SEND operation, and the completion
codes for the receive socket are the same as for
the RECEIVE operation.
(11) ERASE
This subprogram cause data constituting on Online System command
to erase the display tube to be sent from the specified local
socket. The data is sent in a single standard message, including
an op code indicating characters to be displayed as they are
received, and optionally including a trailer. The subprogram
waits for the data to be received by the foreign socket, or to be
queued locally by the NCP. This operation is valid only when the
local socket is a send socket, and is fully open.
The calling sequence is as follows:
<span class="grey">Krilanovich [Page 18]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-19" ></span>
<span class="grey"><a href="./rfc119">RFC 119</a> Network Fortran Subprograms April 21, 1971</span>
CALL ERASE ('cmpcd', 'delay1', 'delay2', 'time')
Where
'cmpcd' is the completion code variable associated with
the local socket.
'delay1', in absolute value, is the length of time, in
tenths of a second, the subprogram is to pause (in
the WAIT state) before sending the erase. If
'delay1' is positive or zero, a trailer will be
sent after the erase; if negative, no trailer will
be sent. 'delay1' is of type INTEGER*4.
'delay2' is the length of time, in tenths of a second,
the subprogram is to pause after sending the erase
and before returning control to the calling
program, and is of type INTEGER*4.
'time' is the length of time the subprogram is to wait
for completion of the operation.
The completion codes for this operation are the
same as for SEND.
Krilanovich [Page 19]
</pre>
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