/*
* Reinitialize a message buffer, retaining its previous contents if
* the size and checksum are correct. If the old contents cannot be
* recovered, the message buffer is cleared.
*/
void
msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size)
{
u_int cksum;
if (mbp->msg_magic != MSG_MAGIC || mbp->msg_size != size) {
msgbuf_init(mbp, ptr, size);
return;
}
mbp->msg_seqmod = SEQMOD(size);
mbp->msg_wseq = MSGBUF_SEQNORM(mbp, mbp->msg_wseq);
mbp->msg_rseq = MSGBUF_SEQNORM(mbp, mbp->msg_rseq);
mbp->msg_ptr = ptr;
cksum = msgbuf_cksum(mbp);
if (cksum != mbp->msg_cksum) {
if (bootverbose) {
printf("msgbuf cksum mismatch (read %x, calc %x)\n",
mbp->msg_cksum, cksum);
printf("Old msgbuf not recovered\n");
}
msgbuf_clear(mbp);
}
mbp->msg_lastpri = -1;
/* Assume that the old message buffer didn't end in a newline. */
mbp->msg_flags |= MSGBUF_NEEDNL;
bzero(&mbp->msg_lock, sizeof(mbp->msg_lock));
mtx_init(&mbp->msg_lock, "msgbuf", NULL, MTX_SPIN);
}
/*
* Reinitialize a message buffer, retaining its previous contents if
* the size and checksum are correct. If the old contents cannot be
* recovered, the message buffer is cleared.
*/
void
msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size)
{
u_int cksum;
if (mbp->msg_magic != MSG_MAGIC || mbp->msg_size != size) {
msgbuf_init(mbp, ptr, size);
return;
}
mbp->msg_seqmod = SEQMOD(size);
mbp->msg_wseq = MSGBUF_SEQNORM(mbp, mbp->msg_wseq);
mbp->msg_rseq = MSGBUF_SEQNORM(mbp, mbp->msg_rseq);
mbp->msg_ptr = ptr;
cksum = msgbuf_cksum(mbp);
if (cksum != mbp->msg_cksum) {
if (bootverbose) {
printf("msgbuf cksum mismatch (read %x, calc %x)\n",
mbp->msg_cksum, cksum);
printf("Old msgbuf not recovered\n");
}
msgbuf_clear(mbp);
}
}
