Date: 08 Oct 2002 21:21:36 +0400 From: "Vladimir B. " Grebenschikov <vova@sw.ru> To: freebsd-current@freebsd.org Subject: DDB sysctl function Message-ID: <1034097697.1548.2.camel@vbook.express.ru>
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[-- Attachment #1 --]
Hi
Attached diff introduces new ddb interface - access to sysctl interface
sysctl - read sysctl value
sysctlw - write sysctl value
Example:
Translate string to sysctl MIB:
db> sysctlw 0.3 hw\.model
0xcd1aaeec: 6 2
db>
Now get string by this MIB:
db> sysctl 6.2 s
0xcd1ab24: Pentium II/Pentium II Xenon/Celeron
db>
Or get vm.kvm_free
db> sysctlw 0.3 vm\.kvm_free
0xcd1aaeec: 2 2da
db> sysctl 2.2da
0xcd1ab2f4: 3800000
db>
This interface useful to inspect/change data easy accessible through
sysctl and hard accessible directly (say dynamic sysctl-mapped data, or
sysctl-mapped fields in complex structures).
Comments appreciated.
--
Vladimir B. Grebenschikov
vova@sw.ru, SWsoft, Inc.
[-- Attachment #2 --]
Index: conf/files
===================================================================
RCS file: /ext/ncvs/src/sys/conf/files,v
retrieving revision 1.713
diff -u -r1.713 files
--- conf/files 5 Oct 2002 16:35:26 -0000 1.713
+++ conf/files 8 Oct 2002 12:24:14 -0000
@@ -218,6 +218,7 @@
ddb/db_variables.c optional ddb
ddb/db_watch.c optional ddb
ddb/db_write_cmd.c optional ddb
+ddb/db_sysctl_cmd.c optional ddb
dev/aac/aac.c optional aac
dev/aac/aac_debug.c optional aac
dev/aac/aac_disk.c optional aac
Index: ddb/db_command.c
===================================================================
RCS file: /ext/ncvs/src/sys/ddb/db_command.c,v
retrieving revision 1.46
diff -u -r1.46 db_command.c
--- ddb/db_command.c 1 Oct 2002 21:59:46 -0000 1.46
+++ ddb/db_command.c 8 Oct 2002 12:22:58 -0000
@@ -422,6 +422,8 @@
{ "gdb", db_gdb, 0, 0 },
{ "reset", db_reset, 0, 0 },
{ "kill", db_kill, CS_OWN, 0 },
+ { "sysctl", db_sysctl_cmd, CS_OWN, 0 },
+ { "sysctlw", db_sysctlw_cmd, CS_OWN, 0 },
{ (char *)0, }
};
Index: ddb/db_examine.c
===================================================================
RCS file: /ext/ncvs/src/sys/ddb/db_examine.c,v
retrieving revision 1.29
diff -u -r1.29 db_examine.c
--- ddb/db_examine.c 25 Jun 2002 15:59:24 -0000 1.29
+++ ddb/db_examine.c 8 Oct 2002 12:20:53 -0000
@@ -44,7 +44,7 @@
static char db_examine_format[TOK_STRING_SIZE] = "x";
-static void db_examine(db_addr_t, char *, int);
+void db_examine(db_addr_t, char *, int);
static void db_search(db_addr_t, int, db_expr_t, db_expr_t, u_int);
/*
@@ -67,7 +67,7 @@
db_examine((db_addr_t) addr, db_examine_format, count);
}
-static void
+void
db_examine(addr, fmt, count)
register
db_addr_t addr;
Index: ddb/db_sysctl_cmd.c
===================================================================
RCS file: ddb/db_sysctl_cmd.c
diff -N ddb/db_sysctl_cmd.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ ddb/db_sysctl_cmd.c 8 Oct 2002 16:30:16 -0000
@@ -0,0 +1,106 @@
+/*
+ * $FreeBSD$
+ */
+
+/*
+ * Author: Potatin Mike, SW-Soft
+ * Date: 10/2002
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+
+#include <ddb/ddb.h>
+
+#include <ddb/db_lex.h>
+#include <ddb/db_output.h>
+#include <ddb/db_command.h>
+#include <ddb/db_sym.h>
+#include <ddb/db_access.h>
+
+#include <sys/sysctl.h>
+#include <sys/proc.h>
+
+void db_examine __P((db_addr_t, char *, int));
+
+void
+db_sysctlw_cmd(d1, d2, d3, d4)
+ db_expr_t d1;
+ boolean_t d2;
+ db_expr_t d3;
+ char * d4;
+{
+ int t;
+ int pcount;
+ int mib[128];
+ size_t ret = 0;
+ size_t readcount = 1024;
+ size_t wsize;
+ char wbuf[1024];
+ char buf[1024];
+ int err;
+
+ pcount = 0;
+ while((t = db_read_token()) == tNUMBER) {
+ mib[pcount] = db_tok_number;
+ pcount++;
+ if((t = db_read_token()) != tDOT) {
+ break;
+ }
+ }
+ switch (t) {
+ case tIDENT:
+ strcpy(wbuf, db_tok_string);
+ wsize = strlen(wbuf);
+ break;
+ case tNUMBER:
+ *(int*)wbuf = db_tok_number;
+ wsize = sizeof(int);
+ break;
+ default:
+ db_printf("no ident\n");
+ db_flush_lex();
+ return;
+ }
+ db_skip_to_eol();
+ if(((err = kernel_sysctl(FIRST_THREAD_IN_PROC(initproc), mib, pcount, buf, &readcount, wbuf, wsize, &ret))) == 0) {
+ db_examine((db_addr_t) buf, "x", ret/sizeof(int));
+ } else {
+ db_printf("sysctl error %d %d\n", err, ret);
+ }
+}
+void
+db_sysctl_cmd(d1, d2, d3, d4)
+ db_expr_t d1;
+ boolean_t d2;
+ db_expr_t d3;
+ char * d4;
+{
+ int t;
+ int pcount;
+ int mib[128];
+ size_t ret = 0;
+ size_t readcount = 1024;
+ char buf[1024];
+ int err;
+ char modif[16]="x";
+
+ pcount = 0;
+ while((t = db_read_token()) == tNUMBER) {
+ mib[pcount] = db_tok_number;
+ pcount++;
+ if((t = db_read_token()) != tDOT) {
+ break;
+ }
+ }
+ if(t == tIDENT) {
+ strncpy(modif, db_tok_string, 15);
+ }
+ db_skip_to_eol();
+
+ if(((err = kernel_sysctl(FIRST_THREAD_IN_PROC(initproc), mib, pcount, buf, &readcount, NULL, 0, &ret))) == 0) {
+ db_examine((db_addr_t) buf, modif, ret/sizeof(int));
+ } else {
+ db_printf("sysctl error %d %d\n", err, ret);
+ }
+}
Index: ddb/ddb.h
===================================================================
RCS file: /ext/ncvs/src/sys/ddb/ddb.h,v
retrieving revision 1.30
diff -u -r1.30 ddb.h
--- ddb/ddb.h 21 Sep 2002 17:29:36 -0000 1.30
+++ ddb/ddb.h 8 Oct 2002 12:23:47 -0000
@@ -125,6 +125,8 @@
db_cmdfcn_t db_trace_until_matching_cmd;
db_cmdfcn_t db_watchpoint_cmd;
db_cmdfcn_t db_write_cmd;
+db_cmdfcn_t db_sysctl_cmd;
+db_cmdfcn_t db_sysctlw_cmd;
#if 0
db_cmdfcn_t db_help_cmd;
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