| || Write the values of some members of the msqid_ds structure pointed to by buf to the message queue data structure, updating also its msg_ctime member. The following members of the structure can be updated: |
msg_perm.mode /* only lowest 9-bits */
The calling process must have appropriate (probably, root) privileges or its effective user-ID must be that of the creator (msg_perm.cuid) or owner (msg_perm.uid) of the message queue. Appropriate (probably, root) privileges are required to raise the msg_qbytes value beyond the system parameter MSGMNB.