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OBSOLETE /*
OBSOLETE * Copyright (c) 1998 Kungliga Tekniska H�gskolan
OBSOLETE * (Royal Institute of Technology, Stockholm, Sweden).
OBSOLETE * All rights reserved.
OBSOLETE *
OBSOLETE * Redistribution and use in source and binary forms, with or without
OBSOLETE * modification, are permitted provided that the following conditions
OBSOLETE * are met:
OBSOLETE *
OBSOLETE * 1. Redistributions of source code must retain the above copyright
OBSOLETE * notice, this list of conditions and the following disclaimer.
OBSOLETE *
OBSOLETE * 2. Redistributions in binary form must reproduce the above copyright
OBSOLETE * notice, this list of conditions and the following disclaimer in the
OBSOLETE * documentation and/or other materials provided with the distribution.
OBSOLETE *
OBSOLETE * 3. Neither the name of the Institute nor the names of its contributors
OBSOLETE * may be used to endorse or promote products derived from this software
OBSOLETE * without specific prior written permission.
OBSOLETE *
OBSOLETE * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
OBSOLETE * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
OBSOLETE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
OBSOLETE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
OBSOLETE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
OBSOLETE * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OBSOLETE * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
OBSOLETE * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
OBSOLETE * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OBSOLETE * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
OBSOLETE * SUCH DAMAGE.
OBSOLETE */
OBSOLETE
OBSOLETE #ifdef HAVE_CONFIG_H
OBSOLETE #include <config.h>
OBSOLETE #endif
OBSOLETE
OBSOLETE RCSID("$arla: mmaptime.c,v 1.8 2002/12/20 12:57:07 lha Exp $");
OBSOLETE
OBSOLETE #include <stdio.h>
OBSOLETE
OBSOLETE /*
OBSOLETE * Speed hack
OBSOLETE *
OBSOLETE * Here we try to mmap time from the kernelspace.
OBSOLETE * There are people claiming that this is about 100 times faster
OBSOLETE * then gettimeofday()
OBSOLETE *
OBSOLETE * You need to have USE_MMAPTIME defined to get it.
OBSOLETE *
OBSOLETE * Other thing that you need is mmap(), getpagesize(), kvm_open() & co
OBSOLETE *
OBSOLETE * If not initalized with mmaptime_probe gettimeofday will be called
OBSOLETE *
OBSOLETE */
OBSOLETE
OBSOLETE #if defined(USE_MMAPTIME)
OBSOLETE
OBSOLETE #if defined(HAVE_MMAP) && defined(HAVE_KVM_OPEN) && defined(HAVE_KVM_NLIST) && defined(HAVE_GETPAGESIZE)
OBSOLETE
OBSOLETE #include "mmaptime.h"
OBSOLETE
OBSOLETE #ifdef HAVE_UNISTD_H
OBSOLETE #include <unistd.h>
OBSOLETE #endif
OBSOLETE #ifdef HAVE_SYS_MMAN_H
OBSOLETE #include <sys/mman.h>
OBSOLETE #endif
OBSOLETE #ifdef HAVE_FCNTL_H
OBSOLETE #include <fcntl.h>
OBSOLETE #endif
OBSOLETE #ifdef HAVE_NLIST_H
OBSOLETE #include <nlist.h>
OBSOLETE #endif
OBSOLETE #ifdef HAVE_ELFLIB_NLIST_H
OBSOLETE #include <elflib/nlist.h>
OBSOLETE #endif
OBSOLETE #ifdef HAVE_KVM_H
OBSOLETE #include <kvm.h>
OBSOLETE #endif
OBSOLETE #include <errno.h>
OBSOLETE
OBSOLETE
OBSOLETE static unsigned long ps;
OBSOLETE static unsigned long begpage;
OBSOLETE static void *mem;
OBSOLETE static int kmemfd = -1;
OBSOLETE static struct timeval *tp = NULL;
OBSOLETE
OBSOLETE
OBSOLETE int mmaptime_probe(void)
OBSOLETE {
OBSOLETE kvm_t *kvm;
OBSOLETE unsigned long value;
OBSOLETE struct nlist nl[2];
OBSOLETE int i, saved_errno;
OBSOLETE
OBSOLETE if (tp)
OBSOLETE return 0;
OBSOLETE
OBSOLETE if (geteuid()) {
OBSOLETE fprintf(stderr, "mmaptime needs to be run as root, falling back on gettimeofday\n");
OBSOLETE return EPERM;
OBSOLETE }
OBSOLETE
OBSOLETE kvm = kvm_open(NULL, NULL, NULL, O_RDONLY, "util/mmaptime");
OBSOLETE nl[0].n_name = "_time";
OBSOLETE nl[1].n_name = NULL;
OBSOLETE i = kvm_nlist(kvm, nl);
OBSOLETE
OBSOLETE /*
OBSOLETE * SunOS 5.6 is broken and returns a zero even when it fails.
OBSOLETE */
OBSOLETE
OBSOLETE if (nl[0].n_value == 0) {
OBSOLETE nl[0].n_name = "time";
OBSOLETE nl[1].n_name = NULL;
OBSOLETE i = kvm_nlist(kvm, nl);
OBSOLETE }
OBSOLETE
OBSOLETE kvm_close(kvm);
OBSOLETE
OBSOLETE if (i != 0)
OBSOLETE return ENOENT;
OBSOLETE
OBSOLETE kmemfd = open("/dev/kmem", O_RDONLY);
OBSOLETE if (kmemfd < 0)
OBSOLETE return errno;
OBSOLETE
OBSOLETE value = nl[0].n_value;
OBSOLETE
OBSOLETE ps = getpagesize();
OBSOLETE
OBSOLETE begpage = value - value % ps ;
OBSOLETE mem = mmap(NULL, ps, PROT_READ, MAP_SHARED, kmemfd, begpage);
OBSOLETE
OBSOLETE if (mem == (void *) -1) {
OBSOLETE saved_errno = errno;
OBSOLETE close(kmemfd);
OBSOLETE return saved_errno;
OBSOLETE }
OBSOLETE
OBSOLETE tp = (struct timeval *) (mem + value % ps);
OBSOLETE return 0;
OBSOLETE }
OBSOLETE
OBSOLETE
OBSOLETE int
OBSOLETE mmaptime_close(void)
OBSOLETE {
OBSOLETE if (tp)
OBSOLETE munmap(mem, ps);
OBSOLETE
OBSOLETE tp = NULL;
OBSOLETE
OBSOLETE if (kmemfd >= 0)
OBSOLETE close(kmemfd);
OBSOLETE
OBSOLETE
OBSOLETE return 0;
OBSOLETE }
OBSOLETE
OBSOLETE int
OBSOLETE mmaptime_gettimeofday(struct timeval *t, void *tzp)
OBSOLETE {
OBSOLETE if (t && tp && !tzp) {
OBSOLETE *t = *tp;
OBSOLETE return 0;
OBSOLETE } else
OBSOLETE return gettimeofday(tp, tzp);
OBSOLETE
OBSOLETE /* NOT REACHED */
OBSOLETE return -1;
OBSOLETE }
OBSOLETE
OBSOLETE
OBSOLETE #else /* USE_MMAPTIME not useable */
OBSOLETE
OBSOLETE #include <errno.h>
OBSOLETE
OBSOLETE int
OBSOLETE mmaptime_probe(void)
OBSOLETE {
OBSOLETE return EOPNOTSUPP;
OBSOLETE }
OBSOLETE
OBSOLETE int
OBSOLETE mmaptime_gettimeofday(struct timeval *tp, void *tzp)
OBSOLETE {
OBSOLETE return gettimeofday(tp, tzp);
OBSOLETE }
OBSOLETE
OBSOLETE int
OBSOLETE mmaptime_close(void)
OBSOLETE {
OBSOLETE return 0;
OBSOLETE }
OBSOLETE
OBSOLETE #endif /* USE_MMAPTIME not useable */
OBSOLETE #endif /* USE_MMAPTIME */
OBSOLETE
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