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dyn_sysctl.c
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Editing: dyn_sysctl.c
/*- * SPDX-License-Identifier: BSD-2-Clause-NetBSD * * Copyright (c) 2000 Andrzej Bialecki <abial@freebsd.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include <sys/types.h> #include <sys/param.h> #include <sys/systm.h> #include <sys/module.h> #include <sys/sysctl.h> #include <sys/kernel.h> /* Some example data */ static long a = 100; static int b = 200; static char *c = "hi there from dyn_sysctl"; static struct sysctl_oid *a_root, *a_root1, *b_root; static struct sysctl_ctx_list clist, clist1, clist2; static int sysctl_dyn_sysctl_test(SYSCTL_HANDLER_ARGS) { char *buf = "let's produce some text..."; return (sysctl_handle_string(oidp, buf, strlen(buf), req)); } /* * The function called at load/unload. */ static int load(module_t mod, int cmd, void *arg) { int error; error = 0; switch (cmd) { case MOD_LOAD: /* Initialize the contexts */ printf("Initializing contexts and creating subtrees.\n\n"); sysctl_ctx_init(&clist); sysctl_ctx_init(&clist1); sysctl_ctx_init(&clist2); /* * Create two partially overlapping subtrees, belonging * to different contexts. */ printf("TREE ROOT NAME\n"); a_root = SYSCTL_ADD_ROOT_NODE(&clist, OID_AUTO, "dyn_sysctl", CTLFLAG_RW, 0, "dyn_sysctl root node"); a_root = SYSCTL_ADD_ROOT_NODE(&clist1, OID_AUTO, "dyn_sysctl", CTLFLAG_RW, 0, "dyn_sysctl root node"); if (a_root == NULL) { printf("SYSCTL_ADD_NODE failed!\n"); return (EINVAL); } SYSCTL_ADD_LONG(&clist, SYSCTL_CHILDREN(a_root), OID_AUTO, "long_a", CTLFLAG_RW, &a, "just to try"); SYSCTL_ADD_INT(&clist, SYSCTL_CHILDREN(a_root), OID_AUTO, "int_b", CTLFLAG_RW, &b, 0, "just to try 1"); a_root1 = SYSCTL_ADD_NODE(&clist, SYSCTL_CHILDREN(a_root), OID_AUTO, "nextlevel", CTLFLAG_RD, 0, "one level down"); SYSCTL_ADD_STRING(&clist, SYSCTL_CHILDREN(a_root1), OID_AUTO, "string_c", CTLFLAG_RD, c, 0, "just to try 2"); printf("1. (%p) / dyn_sysctl\n", &clist); /* Add a subtree under already existing category */ a_root1 = SYSCTL_ADD_NODE(&clist, SYSCTL_STATIC_CHILDREN(_kern), OID_AUTO, "dyn_sysctl", CTLFLAG_RW, 0, "dyn_sysctl root node"); if (a_root1 == NULL) { printf("SYSCTL_ADD_NODE failed!\n"); return (EINVAL); } SYSCTL_ADD_PROC(&clist, SYSCTL_CHILDREN(a_root1), OID_AUTO, "procedure", CTLTYPE_STRING | CTLFLAG_RD, NULL, 0, sysctl_dyn_sysctl_test, "A", "I can be here, too"); printf(" (%p) /kern dyn_sysctl\n", &clist); /* Overlap second tree with the first. */ b_root = SYSCTL_ADD_NODE(&clist1, SYSCTL_CHILDREN(a_root), OID_AUTO, "nextlevel", CTLFLAG_RD, 0, "one level down"); SYSCTL_ADD_STRING(&clist1, SYSCTL_CHILDREN(b_root), OID_AUTO, "string_c1", CTLFLAG_RD, c, 0, "just to try 2"); printf("2. (%p) / dyn_sysctl (overlapping #1)\n", &clist1); /* * And now do something stupid. Connect another subtree to * dynamic oid. * WARNING: this is an example of WRONG use of dynamic sysctls. */ b_root=SYSCTL_ADD_NODE(&clist2, SYSCTL_CHILDREN(a_root1), OID_AUTO, "bad", CTLFLAG_RW, 0, "dependent node"); SYSCTL_ADD_STRING(&clist2, SYSCTL_CHILDREN(b_root), OID_AUTO, "string_c", CTLFLAG_RD, c, 0, "shouldn't panic"); printf("3. (%p) /kern/dyn_sysctl bad (WRONG!)\n", &clist2); break; case MOD_UNLOAD: printf("1. Try to free ctx1 (%p): ", &clist); if (sysctl_ctx_free(&clist) != 0) printf("failed: expected. Need to remove ctx3 first.\n"); else printf("HELP! sysctl_ctx_free(%p) succeeded. EXPECT PANIC!!!\n", &clist); printf("2. Try to free ctx3 (%p): ", &clist2); if (sysctl_ctx_free(&clist2) != 0) { printf("sysctl_ctx_free(%p) failed!\n", &clist2); /* Remove subtree forcefully... */ sysctl_remove_oid(b_root, 1, 1); printf("sysctl_remove_oid(%p) succeeded\n", b_root); } else printf("Ok\n"); printf("3. Try to free ctx1 (%p) again: ", &clist); if (sysctl_ctx_free(&clist) != 0) { printf("sysctl_ctx_free(%p) failed!\n", &clist); /* Remove subtree forcefully... */ sysctl_remove_oid(a_root1, 1, 1); printf("sysctl_remove_oid(%p) succeeded\n", a_root1); } else printf("Ok\n"); printf("4. Try to free ctx2 (%p): ", &clist1); if (sysctl_ctx_free(&clist1) != 0) { printf("sysctl_ctx_free(%p) failed!\n", &clist1); /* Remove subtree forcefully... */ sysctl_remove_oid(a_root, 1, 1); } else printf("Ok\n"); break; default: error = EOPNOTSUPP; break; } return (error); } static moduledata_t mod_data = { "dyn_sysctl", load, 0 }; DECLARE_MODULE(dyn_sysctl, mod_data, SI_SUB_EXEC, SI_ORDER_ANY);
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