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.Dd November 4, 2011 .Dt notifyutil 1 .Os "Mac OS X" .Sh NAME .Nm notifyutil .Nd notification command line utility .Sh SYNOPSIS .Nm .Op Fl q .Op Fl v .Op Fl z Ar msec .Op Fl M .Op Fl R .Op command Li ...
p .Sh DESCRIPTION .Nm is a command-line utility for interacting with the .Xr notify 3 notification system and the .Xr notifyd 8 server. It may be used to post notifications, detect and report notifications, and to examine and set the state values associated with notification keys.
p If .Nm is used to monitor one or more notification keys, it prints the notification key when the corresponding notification is received. The .Fl v (verbose) and .Fl q (quiet) flags, if specified, modify the output behavior.
p The .Fl v flag causes .Nm to print a time stamp, the notification key, the current state value for that key, and the type of the notification (port, file, etc). The .Fl q flag supresses any output except for state values fetched following a .Fl g command.
p Commands listed in the table below are processed in left to right order from the command line.
p l -tag -width "-signal [#]" -compact -offset indent t Fl p Ar key Post a notification for .Ar key . t Fl w Ar key Register for .Ar key and wait forever for notifications. t Fl Ar # Ar key Register for .Ar key and wait for .Ar # (an integer) notifications. t "" .Li E.g. .Fl 1 Ar key waits for a single notification. t Fl g Ar key Get state value for .Ar key . t Fl s Ar key Ar val Set state value for .Ar key . t Fl port Use mach port notifications for subsequent .Fl w or .Fl Ar # registrations. t "" This is the default registration type. t Fl file Use file descriptor notifications for subsequent registrations. t Fl check Use shared memory notifications for subsequent registrations. t Fl signal Op Ar # Use signal notifications for subsequent registrations. t "" Signal 1 (HUP) is the default, but an alternate signal may be specified. t Fl dispatch Use dispatch for subsequent registrations. .El
p When invoked with any combination of .Fl w and .Fl Ar # actions, .Nm registers for notification for the specified key(s). If any key is given with a .Fl w action, .Nm runs until interrupted with Control-C. If all registrations are invoked with .Fl Ar # , the program continues to run until the corresponding number of notifications for each key have been received.
p By default, .Nm uses mach port registration (using .Fn notify_register_mach_port ) for keys given with a .Fl w or .Fl Ar # flag. The .Fl file command causes .Nm to use .Fn notify_register_file_descriptor for any subsequent .Fl w or .Fl Ar # registrations. Similarly, .Fl check causes .Nm to use .Fn notify_register_check for subsequent registrations, .Fl signal switches to .Fn notify_register_signal , and .Fl dispatch causes it to use .Fn notify_register_dispatch for subsequent registrations.
p If any registrations are made following the use of the .Fl check command, .Nm will start a timer and check for shared memory notifications every 100 milliseconds. An alternate timer value may be set following the .Fl z flag.
p The .Fl M flag causes .Nm to use multiplex all notifications over a single mach connection with .Nm notifyd . Notifications (except shared memory notifications) are received and redistributed by a dispatch handler.
p The .Fl R flag causes .Nm notifyutil to regenerate all its registrations in the unlikely event that .Nm notifyd restarts.
p Note that a notification key and its associated state variable only exist when there are one or more current registrations for that key. Setting the state for a key that has no registrations has no effect. Thus the command
p .Dl notifyutil -s foo.bar 123 -g foo.bar
p will print
p .Dl foo.bar 0
p unless foo.bar is registered by some other process. However, the command
p .Dl notifyutil -w foo.bar -s foo.bar 123 -g foo.bar
p prints
p .Dl foo.bar 123
p since the .Dq -w foo.bar registration ensures the key and its state variable exist before the value is set, and continue to exist when the value is fetched. .Sh SEE ALSO notify(3), notifyd(8)