Ipcs do not show MODE Post: 302851705

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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

09-09-2013

Registered User

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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LEARN ABOUT DEBIAN

ipcs

IPCS(1) 							   User Commands							   IPCS(1)

NAME

       ipcs - provide information on ipc facilities

SYNOPSIS

       ipcs [-asmq] [-tclup]
       ipcs [-smq] -i id
       ipcs -h

DESCRIPTION

       ipcs provides information on the ipc facilities for which the calling process has read access.

       The -i option allows a specific resource id to be specified.  Only information on this id will be printed.

       Resources may be specified as follows:

       -m     shared memory segments

       -q     message queues

       -s     semaphore arrays

       -a     all (this is the default)

       The output format may be specified as follows:

       -t     time

       -p     pid

       -c     creator

       -l     limits

       -u     summary

SEE ALSO

       ipcrm(1), ipcmk(1)

CONFORMING TO

       The  Linux  ipcs  utility is not fully compatible to the POSIX ipcs utility.  The Linux version does not support the -b and -o options, but
       does support the -l and -u options not defined by POSIX. The portable application shall not use the -a, -b, -o, -l, and -u options.

AUTHOR

       krishna balasubramanian (balasub@cis.ohio-state.edu)

AVAILABILITY

       The ipcs command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   February 2008							   IPCS(1)

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