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1.1 root 1: 12/30/92 Version 0.02 Vlad
2:
3: Fixed minor output bugs. Made ipcs work with SVR3 compatible
4: shared memory and message queues. Semaphore part is still working
5: with old 286 semaphores. Output layaout for semaphores may be wrong.
6:
7: shmemul.c is included because the proper interface was not
8: included in libc.a. It should be removed as soon as libc.a will
9: be fixed.
10:
11:
12: 09/22/92: Version 0.01
13:
14: This ipcs command does not yet support the Corefile option.
15:
16: ipcs will grok /autoboot by default for the symbols NSEMID, NSHMID and
17: NMSQID, which are the max allowable semaphores, shared memory segments
18: and message queues. It does not touch /dev/kmem. I see no reason for this.
19:
20: Next, it will then perform msgctl()s, semctl()s and/or shmctl()s as necessary
21: to get the stats for any active message queues, semaphores and
22: shared memory segments.
23:
24: It will then print out the information based upon the arguments passed
25: on the command line.
26:
27: This ipcs has on flag that is not part of SV, the 'V' or 'version'
28: flag, which will print the internal version number of the ipcs command.
29:
30: Warning: when requesting information on active message queues, the command
31: will run noticeably slower. This is due to the message queue sequence
32: numbering scheme used by our message driver. Vlad is working on a new
33: message driver, and ipcs will be updated to snarf msg information
34: more quickly when the new driver is available.
35:
36:
37: Docs:
38:
39: ipcs [ options ]
40:
41: ipcs prints certain information about active message queues, semaphores
42: and shared memory segments. The information printed is based upon the
43: options passed to the command. The options are:
44:
45: -q print info about active message queues
46: -m print info about active shared memory segments
47: -s print info about active semaphores
48:
49: If none of the above options are specified, information about each active
50: ipc driver will be printed.
51:
52: -b message queues: max. allowable bytes on message queue
53: shared memory: size of shared memory segment
54: semaphores: number of semaphores in each set
55:
56: -c (all): print creator's login name and group
57:
58: -o message queues: number of messages, total bytes in messages on
59: queue.
60: -p message queues: last process to send message, last process
61: to receive message.
62: shared memory: id of creating process, last process
63: to attach or detach (Not available)
64: -t message queues: time of last msgsend() and msgrcv()
65: shared memory: time of last shmat() or shmdt() (Not available)
66: semaphores: time of last semop()
67:
68: -a use all print (above) options
69:
70: -C corefile: specify corefile to use in place of /autoboot
71: -N namelist: specify name of alternate kernel (/autoboot default)
72:
73:
74:
75: ipcs column headings:
76:
77: T type of facility: q = message queue
78: m = shared memory segment
79: s = semaphore segment
80:
81: ID Identifier for facility entry. This is the 'id' argument
82: passed from shmctl(), msgctl() or semctl() a user program
83: would use to access the facility.
84:
85: KEY This is the key used by msgget(), semget() or shmget() to
86: create the facility.
87:
88: MODE The permissions associated with the shared memory segment, message
89: queue or semaphore. This field may contain additional characters
90: when printing the statistics of a message queue:
91: R A process is waiting on a msgrcv()
92: W A process is waiting on a msgsnd()
93: - msgrcv()/msgsnd() flag is not set
94:
95: The octal number in this field represents the permissions. Please
96: refer to the lexicon article on chmod for information on the
97: values in this field.
98:
99: OWNER The login name if the person who owns the facility
100:
101: GROUP The group that the owner belongs to
102:
103: CREATOR The login name of the creator of the facility
104:
105: CGROUP The group that the creator of the facility belongs to
106:
107: CBYTES The number of bytes currently used in the message queue
108:
109: QNUM The number of messages in the message queue
110:
111: QBYTES The maximimum number of bytes in the message queue
112:
113: LSPID The process id of the last process to send a message to the queue
114:
115: LRPID The process id of the last process to reveive a message from the queue
116:
117: STIME The last time a message was sent to the message queue
118:
119: RTIME The last time a messge was received from the message queue
120:
121: CTIME (shared memory and message queues) The time the shared memory segement
122: or message queue was created or last modified.
123:
124: NATTCH Number of processes attached to the associated shared memory segment
125: (Not available)
126:
127: SEGSZ Size of the shared memory segment
128:
129: CPID The process id that created the shared memory segment
130:
131: LPID The process id of the last attach or detach from the
132: shared memory segment (Not available)
133:
134: ATIME Time of last attach to the shared memory segment (Not available)
135:
136: DTIME Time of last detach from the shared memory segment (Not available)
137:
138: NSEMS The number of semaphore elements in the semaphore
139:
140: OTIME The time that the semaphore was created or last modified
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