logfile man page on Inferno

logfile man page on Inferno

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LOGFILE(4)							    LOGFILE(4)

NAME
       logfile - memory-based append-only circular storage buffer

SYNOPSIS
       logfile [-size] file

DESCRIPTION
       Logfile	creates	 a name at file (the containing directory must already
       exist).	Each write to file appends the written data up to a maximum of
       size  bytes;  subsequent	 writes	 erase the existing data in a circular
       fashion. A read from file will return any  currently  stored  data,  if
       any;  if	 there	is  none,  then	 it will block until more data becomes
       available.  Multiple readers will receive the data independently of one
       another.	 If  a	writing	 process is consistently producing data faster
       than a reading process, then the data read will have some bytes elided;
       a write is never blocked.

SOURCE
       /appl/cmd/logfile.b

SEE ALSO
       wm-logwindow(1), sys-file2chan(2)

BUGS
       Restrictions on sys-file2chan(2) mean that the logfile process will not
       terminate automatically when its file is removed or unmounted.

       There is no indication to a reader of any missing data.

       It is not possible to do a non-blocking read of the log file.

								    LOGFILE(4)

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