HP-UX Reference (11i v3 07/02) - 2 System Calls (vol 5)

msgctl(2) msgctl(2)

[EINVAL] msqid is not a valid message queue identiﬁer.

[EINVAL] cmd is not a valid command, or the command contains invalid parameters.

[EACCES] cmd is equal to

IPC_STAT and Read operation permission is denied to the calling process

(see message operation permissions in glossary(9)).

[EPERM] cmd is equal to IPC_RMID or

IPC_SET and the calling process does not have the OWNER

privilege or the effective user ID of the calling process is not equal to the value of either

msg_perm.uid or msg_perm.cuid

in the data structure associated with msqid.

[EPERM] cmd is equal to

IPC_SET, an attempt is being made to increase to the value of

msg_qbytes , and the user does not have the

LIMIT privilege.

[EFAULT] buf points to an illegal address. Reliable detection of this error is implementation depen-

dent.