lsmp —
Display mach port information for
processes on the system
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>. |
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.