Function msq_remove

freebsd/kern/sysv_msg.c:412–448

}

static void
msq_remove(struct msqid_kernel *msqkptr)
{
	struct msg *msghdr;

	racct_sub_cred(msqkptr->cred, RACCT_NMSGQ, 1);
	racct_sub_cred(msqkptr->cred, RACCT_MSGQQUEUED, msqkptr->u.msg_qnum);
	racct_sub_cred(msqkptr->cred, RACCT_MSGQSIZE, msqkptr->u.msg_cbytes);
	crfree(msqkptr->cred);
	msqkptr->cred = NULL;

	/* Free the message headers */
	msghdr = msqkptr->u.__msg_first;
	while (msghdr != NULL) {
		struct msg *msghdr_tmp;

		/* Free the segments of each message */
		msqkptr->u.msg_cbytes -= msghdr->msg_ts;
		msqkptr->u.msg_qnum--;
		msghdr_tmp = msghdr;
		msghdr = msghdr->msg_next;
		msg_freehdr(msghdr_tmp);
	}

	if (msqkptr->u.msg_cbytes != 0)
		panic("msg_cbytes is screwed up");
	if (msqkptr->u.msg_qnum != 0)
		panic("msg_qnum is screwed up");

	msqkptr->u.msg_qbytes = 0;	/* Mark it as free */

#ifdef MAC
	mac_sysvmsq_cleanup(msqkptr);
#endif

	wakeup(msqkptr);
}

static struct prison *
msg_find_prison(struct ucred *cred)