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/*-
* Copyright 2010, 2012 Konstantin Belousov <kib@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 ``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 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <elf.h>
#include <errno.h>
#include <link.h>
#include <pthread.h>
#include <string.h>
#include "un-namespace.h"
#include "libc_private.h"
extern char **environ;
extern int _DYNAMIC;
#pragma weak _DYNAMIC
void *__elf_aux_vector;
static pthread_once_t aux_vector_once = PTHREAD_ONCE_INIT;
static void
init_aux_vector_once(void)
{
Elf_Addr *sp;
sp = (Elf_Addr *)environ;
while (*sp++ != 0)
;
__elf_aux_vector = (Elf_Auxinfo *)sp;
}
void
__init_elf_aux_vector(void)
{
if (&_DYNAMIC != NULL)
return;
_once(&aux_vector_once, init_aux_vector_once);
}
static pthread_once_t aux_once = PTHREAD_ONCE_INIT;
static int pagesize, osreldate, canary_len, ncpus, pagesizes_len;
static char *canary, *pagesizes;
static void *timekeep;
static void
init_aux(void)
{
Elf_Auxinfo *aux;
for (aux = __elf_aux_vector; aux->a_type != AT_NULL; aux++) {
switch (aux->a_type) {
case AT_CANARY:
canary = (char *)(aux->a_un.a_ptr);
break;
case AT_CANARYLEN:
canary_len = aux->a_un.a_val;
break;
case AT_PAGESIZES:
pagesizes = (char *)(aux->a_un.a_ptr);
break;
case AT_PAGESIZESLEN:
pagesizes_len = aux->a_un.a_val;
break;
case AT_PAGESZ:
pagesize = aux->a_un.a_val;
break;
case AT_OSRELDATE:
osreldate = aux->a_un.a_val;
break;
case AT_NCPUS:
ncpus = aux->a_un.a_val;
break;
case AT_TIMEKEEP:
timekeep = aux->a_un.a_ptr;
break;
}
}
}
int
_elf_aux_info(int aux, void *buf, int buflen)
{
int res;
__init_elf_aux_vector();
if (__elf_aux_vector == NULL)
return (ENOSYS);
_once(&aux_once, init_aux);
switch (aux) {
case AT_CANARY:
if (canary != NULL && canary_len >= buflen) {
memcpy(buf, canary, buflen);
memset(canary, 0, canary_len);
canary = NULL;
res = 0;
} else
res = ENOENT;
break;
case AT_PAGESIZES:
if (pagesizes != NULL && pagesizes_len >= buflen) {
memcpy(buf, pagesizes, buflen);
res = 0;
} else
res = ENOENT;
break;
case AT_PAGESZ:
if (buflen == sizeof(int)) {
if (pagesize != 0) {
*(int *)buf = pagesize;
res = 0;
} else
res = ENOENT;
} else
res = EINVAL;
break;
case AT_OSRELDATE:
if (buflen == sizeof(int)) {
if (osreldate != 0) {
*(int *)buf = osreldate;
res = 0;
} else
res = ENOENT;
} else
res = EINVAL;
break;
case AT_NCPUS:
if (buflen == sizeof(int)) {
if (ncpus != 0) {
*(int *)buf = ncpus;
res = 0;
} else
res = ENOENT;
} else
res = EINVAL;
break;
case AT_TIMEKEEP:
if (buflen == sizeof(void *)) {
if (timekeep != NULL) {
*(void **)buf = timekeep;
res = 0;
} else
res = ENOENT;
} else
res = EINVAL;
break;
default:
res = ENOENT;
break;
}
return (res);
}
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