LSMP(1)                     General Commands Manual                    LSMP(1)

NAME
     lsmp – Display mach port information for processes on the system

SYNOPSIS
     lsmp -h

     lsmp -p <pid> Show mach port usage for <pid>. Run with root privileges to
          see detailed info about port destinations etc.

     lsmp -v Show information in detail for Kernel object based ports.
          Including thread ports and special ports attached to it.

     lsmp -a Show mach port usage for all tasks in the system

     lsmp -j <path> Save output as JSON to <path>.

DESCRIPTION
     The lsmp command prints information about every active right in a task's
     port space, giving a view into the inter-process communication behavior
     of that task.

     Following is an explanation of each symbol and values from the output.
     name        : Task unique name for a port. A "-" signifies that this is a member of a port-set
     ipc-object  : A unique identifier for a kernel object. A "+" sign implies that this entry is expanded from above ipc-object.
     rights      : Rights corresponding to this name. Possible values are recv, send, send-once and port-set.
     flags       : Flags indicating port status.
                     T : Port has tempowner set
                     G : Port is guarded
                     S : Port has strict guarding restrictions
                     I : Port has importance donation flag set
                     R : Port is marked reviving
                     P : Port has task pointer set
     boost       : Importance boost count
     reqs        : Notifications armed on this port.
                     D : Dead name notification
                     N : No sender notification
                     P : Port Destroy requests
     recv        : Number of recv rights for this name.
     send        : Number of send rights stored at this name. This does NOT reflect the total number of send rights for this recv right.
     sonce       : Number of outstanding send-once rights for this receive right.
     oref        : Do send rights exist somewhere for this receive right?
     qlimit      : Queue limit for this port. If orefs column shows -> then it indicates the queue limit on the destination port. And a <- indicates this port right is destined to receive messages from process referred in identifier column.
     msgcount    : Number of messages enqueued on this port. See qlimit for -> and <- explanations.
     context     : Mach port context value.
     identifier  : A unique identifier for a kernel object or task's name for this right. This field is described by the type column.

SEE ALSO
     ddt(1), top(1)

macOS                            July 24, 2012                           macOS