2 * Copyright (c) 1998 Michael Smith
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/kern/kern_environment.c,v 1.10.2.7 2002/05/07 09:57:16 bde Exp $
27 * $DragonFly: src/sys/kern/kern_environment.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
31 * The unified bootloader passes us a pointer to a preserved copy of
32 * bootstrap/kernel environment variables.
33 * We make these available using sysctl for both in-kernel and
34 * out-of-kernel consumers.
36 * Note that the current sysctl infrastructure doesn't allow
37 * dynamic insertion or traversal through handled spaces. Grr.
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/systm.h>
43 #include <sys/sysctl.h>
44 #include <sys/libkern.h>
48 static char *kernenv_next(char *cp);
51 * Look up an environment variable by name.
54 getenv(const char *name)
59 for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
60 for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
66 if (!strncmp(name, cp, len) && name[len] == 0)
73 * Return a string value from an environment variable.
76 getenv_string(const char *name, char *data, int size)
82 strncpy(data, tmp, size);
90 * Return an integer value from an environment variable.
93 getenv_int(const char *name, int *data)
98 rval = getenv_quad(name, &tmp);
106 * Return a quad_t value from an environment variable.
109 getenv_quad(const char *name, quad_t *data)
115 if ((value = getenv(name)) == NULL)
118 iv = strtoq(value, &vtp, 0);
119 if ((vtp == value) || (*vtp != '\0'))
127 sysctl_kernenv(SYSCTL_HANDLER_ARGS)
129 int *name = (int *)arg1;
130 u_int namelen = arg2;
134 if (kern_envp == NULL)
144 for (i = 0; i < name[0]; i++) {
145 cp = kernenv_next(cp);
153 error = SYSCTL_OUT(req, cp, strlen(cp) + 1);
157 SYSCTL_NODE(_kern, OID_AUTO, environment, CTLFLAG_RD, sysctl_kernenv, "kernel environment space");
160 * Find the next entry after the one which (cp) falls within, return a
161 * pointer to its start or NULL if there are no more.
164 kernenv_next(char *cp)
177 tunable_int_init(void *data)
179 struct tunable_int *d = (struct tunable_int *)data;
181 TUNABLE_INT_FETCH(d->path, d->var);
185 tunable_quad_init(void *data)
187 struct tunable_quad *d = (struct tunable_quad *)data;
189 TUNABLE_QUAD_FETCH(d->path, d->var);
193 tunable_str_init(void *data)
195 struct tunable_str *d = (struct tunable_str *)data;
197 TUNABLE_STR_FETCH(d->path, d->var, d->size);