154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* The unified bootloader passes us a pointer to a preserved copy of
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* bootstrap/kernel environment variables.
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* We make these available using sysctl for both in-kernel and
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* out-of-kernel consumers.
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*
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* Note that the current sysctl infrastructure doesn't allow
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* dynamic insertion or traversal through handled spaces. Grr.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/libkern.h>
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char *kern_envp;
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static char *kernenv_next(char *cp);
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char *
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getenv(char *name)
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{
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char *cp, *ep;
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int len;
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for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
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for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
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;
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len = ep - cp;
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if (*ep == '=')
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ep++;
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if (!strncmp(name, cp, len))
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return(ep);
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}
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return(NULL);
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}
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/*
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* Return an integer value from an environment variable.
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*/
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int
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getenv_int(char *name, int *data)
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{
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quad_t tmp;
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int rval;
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rval = getenv_quad(name, &tmp);
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if (rval) {
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*data = (int) tmp;
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}
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return (rval);
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}
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/*
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* Return a quad_t value from an environment variable.
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*/
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quad_t
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getenv_quad(char *name, quad_t *data)
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{
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const char *value;
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char *vtp;
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quad_t iv;
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if ((value = getenv(name)) == NULL)
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return(0);
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iv = strtoq(value, &vtp, 0);
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if ((vtp == value) || (*vtp != '\0'))
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return(0);
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*data = iv;
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return(1);
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}
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static int
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sysctl_kernenv(SYSCTL_HANDLER_ARGS)
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{
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int *name = (int *)arg1;
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u_int namelen = arg2;
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char *cp;
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int i, error;
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if (kern_envp == NULL)
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return(ENOENT);
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name++;
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namelen--;
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if (namelen != 1)
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return(EINVAL);
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cp = kern_envp;
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for (i = 0; i < name[0]; i++) {
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cp = kernenv_next(cp);
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if (cp == NULL)
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break;
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}
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if (cp == NULL)
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return(ENOENT);
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error = SYSCTL_OUT(req, cp, strlen(cp) + 1);
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return (error);
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}
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SYSCTL_NODE(_kern, OID_AUTO, environment, CTLFLAG_RD, sysctl_kernenv, "kernel environment space");
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/*
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* Find the next entry after the one which (cp) falls within, return a
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* pointer to its start or NULL if there are no more.
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*/
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static char *
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kernenv_next(char *cp)
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{
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if (cp != NULL) {
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while (*cp != 0)
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cp++;
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cp++;
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if (*cp == 0)
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cp = NULL;
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}
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return(cp);
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}
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