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Full Discussion: Ipcs do not show MODE
Top Forums UNIX for Advanced & Expert Users Ipcs do not show MODE Post 302851705 by migurus on Monday 9th of September 2013 01:31:31 PM
Old 09-09-2013
Ipcs do not show MODE

The ipcs -q command output includes a MODE column which tells user if the process is waiting on read or write on the queue. I used this in scripts on many systems (Solaris, AIX, SCO)

a snippet from man
Code:
 
MODE (all)
       The facility access modes and flags: The mode consists of
       11 characters that are interpreted as follows:
       The first two characters are:
     R
            if a process is waiting on a msgrcv;
     S
            if a process is waiting on a msgsnd;

output example
Code:
 
T     ID     KEY        MODE       OWNER    GROUP
Message Queues:
q      0 0x012a9fc2 -Rrw-rw-rw-     root     root

I run ipcs -q on Ubuntu 12.04 and the mode information is missing.

Is this peculiarity of Ubuntu, or all Linux distros are the same?

Note to administrators - I am not sure where to post this question, please move as you feel it best fit.

Last edited by migurus; 09-09-2013 at 03:00 PM.. Reason: typo
 

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