138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*-
|
|
* Copyright (c) 1998 Michael Smith
|
|
* 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.
|
|
*
|
|
* $Id: kern_environment.c,v 1.5 1999/01/27 21:24:50 dillon Exp $
|
|
*/
|
|
|
|
/*
|
|
* The unified bootloader passes us a pointer to a preserved copy of
|
|
* bootstrap/kernel environment variables.
|
|
* We make these available using sysctl for both in-kernel and
|
|
* out-of-kernel consumers.
|
|
*
|
|
* Note that the current sysctl infrastructure doesn't allow
|
|
* dynamic insertion or traversal through handled spaces. Grr.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/libkern.h>
|
|
#include <machine/bootinfo.h>
|
|
|
|
char *kern_envp;
|
|
|
|
static char *kernenv_next(char *cp);
|
|
|
|
char *
|
|
getenv(char *name)
|
|
{
|
|
char *cp, *ep;
|
|
int len;
|
|
|
|
for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
|
|
for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
|
|
;
|
|
len = ep - cp;
|
|
if (*ep == '=')
|
|
ep++;
|
|
if (!strncmp(name, cp, len))
|
|
return(ep);
|
|
}
|
|
return(NULL);
|
|
}
|
|
|
|
/*
|
|
* Return an integer value from an environment variable.
|
|
*/
|
|
int
|
|
getenv_int(char *name, int *data)
|
|
{
|
|
const char *value, *vtp;
|
|
quad_t iv;
|
|
|
|
if ((value = getenv(name)) == NULL)
|
|
return(0);
|
|
|
|
iv = strtoq(value, &vtp, 0);
|
|
if ((vtp == value) || (*vtp != 0))
|
|
return(0);
|
|
|
|
*data = (int)iv;
|
|
return(1);
|
|
}
|
|
|
|
static int
|
|
sysctl_kernenv SYSCTL_HANDLER_ARGS
|
|
{
|
|
int *name = (int *)arg1;
|
|
u_int namelen = arg2;
|
|
char *cp;
|
|
int i, error;
|
|
|
|
if (kern_envp == NULL)
|
|
return(ENOENT);
|
|
|
|
name++;
|
|
namelen--;
|
|
|
|
if (namelen != 1)
|
|
return(EINVAL);
|
|
|
|
cp = kern_envp;
|
|
for (i = 0; i < name[0]; i++) {
|
|
cp = kernenv_next(cp);
|
|
if (cp == NULL)
|
|
break;
|
|
}
|
|
|
|
if (cp == NULL)
|
|
return(ENOENT);
|
|
|
|
error = SYSCTL_OUT(req, cp, strlen(cp) + 1);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, environment, CTLFLAG_RD, sysctl_kernenv, "kernel environment space");
|
|
|
|
/*
|
|
* Find the next entry after the one which (cp) falls within, return a
|
|
* pointer to its start or NULL if there are no more.
|
|
*/
|
|
static char *
|
|
kernenv_next(char *cp)
|
|
{
|
|
if (cp != NULL) {
|
|
while (*cp != 0)
|
|
cp++;
|
|
cp++;
|
|
if (*cp == 0)
|
|
cp = NULL;
|
|
}
|
|
return(cp);
|
|
}
|
|
|