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amslog - Online in the Cloud

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This is the command amslog that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



amslog - Asynchronous Message Service (AMS) test message receiver


amslog unit_name role_name application_name authority_name [{ s | i }]


amslog is a message reception program designed to test AMS functionality.

When amslog is started, it registers as an application module in the unit identified by
unit_name of the venture identified by application_name and authority_name; the role in
which it registers must be indicated in role_name. A configuration server for the local
continuum and a registrar for the indicated unit of the indicated venture (which may both
be instantiated in a single amsd daemon task) must be running in order for amslog to run.

amslog runs as two threads: a background thread that receives AMS messages and logs them
to standard output, together with a foreground thread that acquires operating parameters
in lines of console input to control the flow of messages to the background thread.

When the first character of a line of input from stdin to the amslog foreground thread is
'.' (period), amslog immediately terminates. Otherwise, the first character of each line
of input from stdin must be either '+' indicating assertion of interest in a message
subject or '-' indicating cessation of interest in a subject. In each case, the name of
the subject in question must begin in the second character of the input line. Note that
"everything" is a valid subject name.

By default, amslog runs in "subscribe" mode: when interest in a message subject is
asserted, amslog subscribes to that subject; when interest in a message subject is
rescinded, amslog unsubscribes to that subject. This behavior can be overridden by
providing a third command-line argument to amslog - a "mode" indicator. When mode is 'i',
amslog runs in "invite" mode. In "invite" mode, when interest in a message subject is
asserted, amslog invites messages on that subject; when interest in a message subject is
rescinded, amslog cancels its invitation for messages on that subject.

The "domain" of a subscription or invitation can optionally be specified immediately after
the subject name, on the same line of console input:

Domain continuum name may be specified, or the place-holder domain continuum name "_"
may be specified to indicate "all continua".

If domain continuum name ("_" or otherwise) is specified, then domain unit name may be
specified or the place-holder domain unit name "_" may be specified to indicate "the
root unit" (i.e., the entire venture).

If domain unit name ("_" or otherwise) is specified, then domain role name may be

When amslog runs in VxWorks or RTEMS, the subject and content of each message are simply
written to standard output in a text line for display on the console. When amslog runs in
a UNIX environment, the subject name length (a binary integer), subject name (ASCII text),
content length (a binary integer), and content (ASCII text) are written to standard output
for redirection either to a file or to a pipe to amslogprt.

Whenever a received message is flagged as a Query, amslog returns a reply message whose
content is the string "Got " followed by the first 128 bytes of the content of the Query
message, enclosed in single quote marks and followed by a period.


-1 amslog terminated with an error as noted in the ion.log file.

"0" amslog terminated normally.

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