diff options
Diffstat (limited to 'sys/kern/subr_prf.c')
| -rw-r--r-- | sys/kern/subr_prf.c | 49 |
1 files changed, 45 insertions, 4 deletions
diff --git a/sys/kern/subr_prf.c b/sys/kern/subr_prf.c index 9124f67..c30e45b 100644 --- a/sys/kern/subr_prf.c +++ b/sys/kern/subr_prf.c @@ -36,13 +36,12 @@ * SUCH DAMAGE. * * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 - * $Id: subr_prf.c,v 1.44 1997/12/28 05:03:33 bde Exp $ + * $Id: subr_prf.c,v 1.45 1998/05/19 08:58:51 phk Exp $ */ -#include "opt_msgbuf.h" - #include <sys/param.h> #include <sys/systm.h> +#include <sys/kernel.h> #include <sys/msgbuf.h> #include <sys/malloc.h> #include <sys/proc.h> @@ -71,6 +70,7 @@ static void putchar __P((int ch, void *arg)); static char *ksprintn __P((u_long num, int base, int *len)); static int consintr = 1; /* Ok to handle console interrupts? */ +static int msgbufmapped; /* Set when safe to use msgbuf */ /* * Warn that a system table is full. @@ -275,7 +275,7 @@ vprintf(const char *fmt, va_list ap) /* * Print a character on console or users terminal. If destination is - * the console then the last MSGBUFS characters are saved in msgbuf for + * the console then the last bunch of characters are saved in msgbuf for * inspection later. */ static void @@ -598,3 +598,44 @@ msglogchar(int c, void *dummyarg) } } } + +void +msgbufinit(void *ptr, size_t size) +{ + char *cp; + + cp = (char *)ptr; + msgbufp = (struct msgbuf *) (cp + size - sizeof(*msgbufp)); + if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_ptr != cp) { + bzero(cp, size); + msgbufp->msg_magic = MSG_MAGIC; + msgbufp->msg_size = (char *)msgbufp - cp; + msgbufp->msg_ptr = cp; + } + msgbufmapped = 1; +} + +#include "opt_ddb.h" +#ifdef DDB +#include <ddb/ddb.h> + +DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) +{ + int i, j; + + if (!msgbufmapped) { + db_printf("msgbuf not mapped yet\n"); + return; + } + db_printf("msgbufp = %p\n", msgbufp); + db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n", + msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_bufr, + msgbufp->msg_bufx, msgbufp->msg_ptr); + for (i = 0; i < msgbufp->msg_size; i++) { + j = (i + msgbufp->msg_bufr) % msgbufp->msg_size; + db_printf("%c", msgbufp->msg_ptr[j]); + } + db_printf("\n"); +} + +#endif /* DDB */ |
