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If a "create" or "destroy" operation succeeds, mark the cached tree as 

"stale" so that the next time we try to read or write to it, we can
purge (and refresh) it.

Addresses PR 29222.
This commit is contained in:
atatat 2005-03-23 03:45:25 +00:00
parent e0ba8227a7
commit 0f48b53686
1 changed files with 51 additions and 9 deletions
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60
sbin/sysctl/sysctl.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sysctl.c,v 1.99 2005/03/19 23:19:17 atatat Exp $ */
/* $NetBSD: sysctl.c,v 1.100 2005/03/23 03:45:25 atatat Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
@ -72,7 +72,7 @@ __COPYRIGHT(
#if 0
static char sccsid[] = "@(#)sysctl.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: sysctl.c,v 1.99 2005/03/19 23:19:17 atatat Exp $");
__RCSID("$NetBSD: sysctl.c,v 1.100 2005/03/23 03:45:25 atatat Exp $");
#endif
#endif /* not lint */
@ -127,6 +127,7 @@ __RCSID("$NetBSD: sysctl.c,v 1.99 2005/03/19 23:19:17 atatat Exp $");
*/
static const struct handlespec *findhandler(const char *, int);
static void canonicalize(const char *, char *);
static void purge_tree(struct sysctlnode *);
static void print_tree(int *, u_int, struct sysctlnode *, u_int, int);
static void write_number(int *, u_int, struct sysctlnode *, char *);
static void write_string(int *, u_int, struct sysctlnode *, char *);
@ -238,7 +239,7 @@ struct sysctlnode my_root = {
int Aflag, aflag, dflag, Mflag, nflag, qflag, rflag, wflag, xflag;
size_t nr;
char *fn;
int req;
int req, stale;
FILE *warnfp = stderr;
/*
@ -320,7 +321,7 @@ main(int argc, char *argv[])
if (Aflag)
warnfp = stdout;
req = 0;
stale = req = 0;
if (aflag) {
print_tree(&name[0], 0, NULL, CTLTYPE_NODE, 1);
@ -499,6 +500,37 @@ st(u_int t)
return "???";
}
/*
* ********************************************************************
* recursively eliminate all data belonging to the given node
* ********************************************************************
*/
static void
purge_tree(struct sysctlnode *rnode)
{
struct sysctlnode *node;
if (rnode == NULL ||
SYSCTL_TYPE(rnode->sysctl_flags) != CTLTYPE_NODE ||
rnode->sysctl_child == NULL)
return;
for (node = rnode->sysctl_child;
node < &rnode->sysctl_child[rnode->sysctl_clen];
node++)
purge_tree(node);
free(rnode->sysctl_child);
rnode->sysctl_csize = 0;
rnode->sysctl_clen = 0;
rnode->sysctl_child = NULL;
if (rnode->sysctl_desc == (const char*)-1)
rnode->sysctl_desc = NULL;
if (rnode->sysctl_desc != NULL)
free((void*)rnode->sysctl_desc);
rnode->sysctl_desc = NULL;
}
/*
* ********************************************************************
* print this node and any others underneath it
@ -787,6 +819,10 @@ parse(char *l)
return;
}
if (stale) {
purge_tree(&my_root);
stale = 0;
}
node = &my_root;
namelen = CTL_MAXNAME;
sz = sizeof(gsname);
@ -1310,8 +1346,11 @@ parse_create(char *l)
nname, strerror(errno));
EXIT(1);
}
else if (!qflag && !nflag)
printf("%s(%s): (created)\n", nname, st(type));
else {
if (!qflag && !nflag)
printf("%s(%s): (created)\n", nname, st(type));
stale = 1;
}
}
static void
@ -1350,9 +1389,12 @@ parse_destroy(char *l)
l, strerror(errno));
EXIT(1);
}
else if (!qflag && !nflag)
printf("%s(%s): (destroyed)\n", gsname,
st(SYSCTL_TYPE(node.sysctl_flags)));
else {
if (!qflag && !nflag)
printf("%s(%s): (destroyed)\n", gsname,
st(SYSCTL_TYPE(node.sysctl_flags)));
stale = 1;
}
}
static void