2793b01844
number of host CPUs and osreldate. This eliminates the last sysctl(2) calls from the dynamically linked image startup. No objections from: kan Tested by: marius (sparc64) MFC after: 1 month
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/*-
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* Copyright 2010 Konstantin Belousov <kib@FreeBSD.ORG>.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <elf.h>
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#include <errno.h>
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#include <link.h>
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#include <pthread.h>
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#include <string.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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Elf_Auxinfo *__elf_aux_vector;
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static pthread_once_t aux_once = PTHREAD_ONCE_INIT;
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static int pagesize, osreldate, canary_len, ncpus, pagesizes_len;
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static char *canary, *pagesizes;
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static void
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init_aux(void)
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{
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Elf_Auxinfo *aux;
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for (aux = __elf_aux_vector; aux->a_type != AT_NULL; aux++) {
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switch (aux->a_type) {
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case AT_CANARY:
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canary = (char *)(aux->a_un.a_ptr);
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break;
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case AT_CANARYLEN:
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canary_len = aux->a_un.a_val;
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break;
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case AT_PAGESIZES:
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pagesizes = (char *)(aux->a_un.a_ptr);
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break;
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case AT_PAGESIZESLEN:
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pagesizes_len = aux->a_un.a_val;
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break;
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case AT_PAGESZ:
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pagesize = aux->a_un.a_val;
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break;
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case AT_OSRELDATE:
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osreldate = aux->a_un.a_val;
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break;
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case AT_NCPUS:
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ncpus = aux->a_un.a_val;
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break;
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}
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}
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}
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int
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_elf_aux_info(int aux, void *buf, int buflen)
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{
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int res;
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if (__elf_aux_vector == NULL)
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return (ENOSYS);
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_once(&aux_once, init_aux);
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switch (aux) {
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case AT_CANARY:
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if (canary != NULL && canary_len >= buflen) {
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memcpy(buf, canary, buflen);
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memset(canary, 0, canary_len);
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canary = NULL;
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res = 0;
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} else
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res = ENOENT;
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break;
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case AT_PAGESIZES:
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if (pagesizes != NULL && pagesizes_len >= buflen) {
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memcpy(buf, pagesizes, buflen);
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res = 0;
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} else
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res = ENOENT;
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break;
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case AT_PAGESZ:
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if (buflen == sizeof(int)) {
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if (pagesize != 0) {
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*(int *)buf = pagesize;
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res = 0;
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} else
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res = ENOENT;
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} else
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res = EINVAL;
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break;
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case AT_OSRELDATE:
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if (buflen == sizeof(int)) {
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if (osreldate != 0) {
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*(int *)buf = osreldate;
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res = 0;
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} else
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res = ENOENT;
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} else
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res = EINVAL;
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break;
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case AT_NCPUS:
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if (buflen == sizeof(int)) {
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if (ncpus != 0) {
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*(int *)buf = ncpus;
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res = 0;
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} else
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res = ENOENT;
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} else
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res = EINVAL;
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break;
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default:
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res = ENOENT;
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break;
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}
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return (res);
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}
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