39a8d9f3f0
value too large for the buffer allocated. Work around this by retrying a few times with larger buffer sizes. Submitted by: Scott Ferris <scott.ferris@isilon.com> Reviewed by: mlaier, ngie Sponsored by: EMC Isilon Storage Division
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*-
|
|
* Copyright (c) 2003 Poul-Henning Kamp
|
|
* 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.
|
|
* 3. The names of the authors may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* 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/sysctl.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "libgeom.h"
|
|
|
|
/*
|
|
* Amount of extra space we allocate to try and anticipate the size of
|
|
* confxml.
|
|
*/
|
|
#define GEOM_GETXML_SLACK 4096
|
|
|
|
/*
|
|
* Number of times to retry in the face of the size of confxml exceeding
|
|
* that of our buffer.
|
|
*/
|
|
#define GEOM_GETXML_RETRIES 4
|
|
|
|
char *
|
|
geom_getxml(void)
|
|
{
|
|
char *p;
|
|
size_t l = 0;
|
|
int mib[3];
|
|
size_t sizep;
|
|
int retries;
|
|
|
|
sizep = sizeof(mib) / sizeof(*mib);
|
|
if (sysctlnametomib("kern.geom.confxml", mib, &sizep) != 0)
|
|
return (NULL);
|
|
if (sysctl(mib, sizep, NULL, &l, NULL, 0) != 0)
|
|
return (NULL);
|
|
l += GEOM_GETXML_SLACK;
|
|
|
|
for (retries = 0; retries < GEOM_GETXML_RETRIES; retries++) {
|
|
p = malloc(l);
|
|
if (p == NULL)
|
|
return (NULL);
|
|
if (sysctl(mib, sizep, p, &l, NULL, 0) == 0)
|
|
return (reallocf(p, strlen(p) + 1));
|
|
|
|
free(p);
|
|
|
|
if (errno != ENOMEM)
|
|
return (NULL);
|
|
|
|
/*
|
|
* Our buffer wasn't big enough. Make it bigger and
|
|
* try again.
|
|
*/
|
|
l *= 2;
|
|
}
|
|
|
|
return (NULL);
|
|
}
|