ipcs:
-q Writes information about active message queues
-o
Writes the following usage information:
* Number of messages on queue
* Total number of bytes in messages in queue for message queues
* Number of processes attached to shared memory segments
-m
Writes information about active shared memory segments.
secumid$ ipcs -qo | grep secumid
q 123731977 0x4207803a --rw-rw-rw- secumid staff 0 0
q 104857729 0x4107803a -Rrw-rw-rw- secumid staff 0 0
secumid$ ipcs -m | grep secumid
m 16777365 0x4707803d --rw------- secumid staff
-------------------------------------------------------------------------------------------------------------------------
secumid$ ipcs | grep secumid | awk '{printf("ipcrm -%s %s;\n", $1, $2)}'
ipcrm -q 123731977;
ipcrm -q 104857729;
ipcrm -m 16777365;
-m SharedMemory ID
Removes the shared memory identifier SharedMemoryID. The shared memory segment and data structure associated
with SharedMemoryID are also removed after the last detach operation.
-q MessageID
Removes the message queue identifier MessageID and the message queue and data structure associated with it.
$ ipcs -qo | grep secure
q 12582913 0x4200b308 --rw-rw-rw- secure staff 0 0
q 12582914 0x4100b308 -Rrw-rw-rw- secure staff 0 0
q 32506398 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 26214946 0x000368e0 -Rrw-rw-rw- secure staff 0 0
q 26214947 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 26214953 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 26214957 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 26214958 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 26214959 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 26214960 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 32506417 0xffffffff -Rrw-rw-rw- secure staff 0 0
q 34603590 0xffffffff -Rrw-rw-rw- secure staff 0 0
其中:
T ID KEY MODE OWNER GROUP CBYTES QNUM
q 32506398 0xffffffff -Rrw-rw-rw- secure staff 0 0
表示该消息队列不能使用