DOC HOME SITE MAP MAN PAGES GNU INFO SEARCH PRINT BOOK
 
Administering BNU

Checkpoint files (P. files)

Files in the BNU spool directories that have filenames beginning with the characters P. are checkpoint files. A checkpoint file is created when processing terminates abnormally. Unlike the TM.pid.ddd file, it is not removed. Therefore, when the transfer session is re-established, the length of the checkpoint file serves as an appropriate place to restart the transfer of the file, instead of restarting from the beginning. When checkpointing is specified for a file being transferred from another computer, the checkpoint file is used instead of a TM file. checkpoint files are created in the spool directory. Checkpointing occurs only between two systems that have the BNU enhancements introduced in UNIX System V Release 4. The names of the checkpoint files have the following format:

P.systmxxxxyyy

where systm is the first five characters in the name of the remote computer, xxxx is a four-digit job sequence number assigned by uucp. The four-digit job sequence number may be followed by a sub-sequence number, yyy, which is used when there are several P. files created for a work (C.) file. When the entire file is received, the P.systmxxxxyyy file is moved to the pathname specified in the C.sysnxxxx file (discussed shortly) that caused the transmission.


© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 22 April 2004