Line Protocol Selection; Work Processing - Sun Microsystems Sun Workstation 100U System Manager's Manual

UUCICO - Copy In, Copy Out
UUCP Implementation Description
[2] times to call the system (days-ot-week and times-ot-day) and the minimum time delay
berore retry,
[3]
device or device type to be used ror call,
[4]
line class (this is the line speed on almost all systems),
[5]
phone number ir field
[3]
is ACU or the device ir not AClJ,
[6]
login inrormation (zero or more fields),
The time field is checked against the present time to see if the call should be made. The
pAone
number
may contain abbreviations (ror example, mh, py, boston) that get translated into dial
sequences using the L- dia/cotle. file.
The
L-t1evice.
file is scanned using fields
[3]
and
[4]
rrom the
L
.'11'
file to find an available dev-
ice ror the call. The program tries each devices that satisry
[3]
and
[4J
until a call is made, or no
more devices can be tried. Ir a device is successrully opened, a lock file is created. If the call is
completed, the login inCormation (field
[6J
or L
.'11' )
is used to login.
The conversation between the two
uucico
programs begins with a handshake started by the
called (SLA VEl system. The SLA VE sends a message to let the MASTER know it is ready to
receive the system identification and conversation sequence number. The SLA VE verifies the
response from the MASTER and if acceptable, protocol selection begins. The SLA VE can also
reply with a "call-back required" message, in which case the current conversation is terminated.
5.3.
Line Protocol Selection
The remote system sends a message:
Pproto-lid
w here proto-lid is a string or characters, each representing a line protocol.
The calling program checks
proto-lilt
for a letter eorresponding to an available line protocol and
returns a
u~e-protocol
message. The
u.e-protocol
message is
U code
w here code is either a one character protocol letter or "N", which means there is no common
protocol. The only protocol which is currently implemented is "g", which uses the packet
driver.
5.4. Work Processing
The MASTER program does a work search similar to the one used in the SctJn For Work sec-
tion described above (the MASTER has been specified by the "-rl" uucico option). Each me&-
sage used during the work processing is specified by the first character or the message:
S send a file,
R receive a file,
C copy complete,
X execute a
uucp
command,
H hangup.
The MASTER sends R, S or X messages until all work for the remote system is complete, at
which point an H message is sent. The SLA VE replies with SY, SN, R Y, RN, HY, HN, XY, or
8
7 January 1984