Network Working Group 29 April 1971
Request for Comments: 141 E. F. Harslem - Rand
NIC 6726 J. F. Haefner - Rand
COMMENTS ON RFC #114 (A FILE TRANSFER PROTOCOL)
1. A file transfer protocol is needed. Bushan's proposal would
satisfy a particular current need that we have, as well as short-term
2. Bushan's protocol would apear to be straight- forward in
implementation, and extensible as claimed.
3. We would like to see implementations of such protocol be
accomplished such that the file transfer pro- gram has general and
complete access to the local file storage. That is, it should be able
to access a file that it did not create. For example, if a program or
user creates a file at site X (completely independent of the file
trans- fer program), it would then be desirable to be able to retrieve
the file via the file transfer program. This is not a requirement of
RFC #114 but we would like to see it implemented where possible.
4. Since implementation of a subset of transaction types is
specifically permitted, we suggest inclusion of the following commands
(in addition to append).
insert records within a file
delete records from within a file
replace records within a file
Although these operations are not directly supported under IBM
OS/360, we have used them with a non-standard file subsystem under IBM
OS/360 and find them quite useful.
5. In addition to retrieve and lookup, get names of files under
my access control would be useful.
6. The absence of status requests and responses is apparent.
Although this is typically a function associated with a remote job
entry (RJE) system, since the execute request is present it would seem
appropriate to inquire about the status of the process created by the
execute command. This becomes increasingly more important where the
execute is implemented as an RJE-like operation and scheduling time of
the job might be prolonged.
7. When requesting execute, the using host sends parameters upon
receipt of the rr response. Executing a task can be implemented in
several ways. The options our 360 affords are RJE at job level and
the attach macro. Our preference would be the attach macro which
immediately initiates an independent OS task within the partition of
the program issuing the attach (presumably the File Service). Such a
task normally receives parameters upon initiation and can thereafter
receive parameters from a program via some mechanism such as an event
control block. The second method requires special modifications to
the program being executed; hence, it is not desirable. Therefore, we
either need the parameters included in the execute command or will not
actually start execution until parameters are received.
8. Upon abnormal termination, one should include part or all of
the spurious request as well as an identify- ing code to facilitate
precise error recognition.
9. We would be interested in the outcome of the MIT/ Harvard
experiments with the RFC #114 protocol. What were the pitfalls, etc.?
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Simone Demmel 4/97 ]