Author: kevans Date: Thu Aug 9 01:32:09 2018 New Revision: 337518 URL: https://svnweb.freebsd.org/changeset/base/337518
Log: kern: Add a BOOT_TAG marker at the beginning of boot dmesg From the "newly licensed to drive" PR department, add a BOOT_TAG marker (by default, --<<BOOT>>--, to the beginning of each boot's dmesg. This makes it easier to do textproc magic to locate the start of each boot and, of particular interest to some, the dmesg of the current boot. The PR has a dmesg(8) component as well that I've opted not to include for the moment- it was the more contentious part of this PR. bde@ also made the statement that this boot tag should be written with an ordinary printf, which I've- for the moment- declined to change about this patch to keep it more transparent to observer of the boot process. PR: 43434 Submitted by: dak <[email protected]> (basically rewritten) MFC after: maybe never Modified: head/sys/kern/subr_prf.c head/sys/sys/msgbuf.h Modified: head/sys/kern/subr_prf.c ============================================================================== --- head/sys/kern/subr_prf.c Thu Aug 9 01:17:35 2018 (r337517) +++ head/sys/kern/subr_prf.c Thu Aug 9 01:32:09 2018 (r337518) @@ -1027,6 +1027,7 @@ msgbufinit(void *ptr, int size) cp = (char *)ptr; msgbufp = (struct msgbuf *)(cp + size); msgbuf_reinit(msgbufp, cp, size); + msgbuf_addstr(msgbufp, -1, BOOT_TAG, 0); if (msgbufmapped && oldp != msgbufp) msgbuf_copy(oldp, msgbufp); msgbufmapped = 1; Modified: head/sys/sys/msgbuf.h ============================================================================== --- head/sys/sys/msgbuf.h Thu Aug 9 01:17:35 2018 (r337517) +++ head/sys/sys/msgbuf.h Thu Aug 9 01:32:09 2018 (r337518) @@ -60,6 +60,9 @@ struct msgbuf { /* Subtract sequence numbers. Note that only positive values result. */ #define MSGBUF_SEQSUB(mbp, seq1, seq2) (MSGBUF_SEQNORM((mbp), (seq1) - (seq2))) +/* Tag used to mark the start of a boot in dmesg */ +#define BOOT_TAG "---<<BOOT>>---" + #ifdef _KERNEL extern int msgbufsize; extern int msgbuftrigger; _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
