mirror of
https://github.com/OpenVPN/openvpn.git
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ffea644ce6
in a memory-mapped file. Version 2.1.16 git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@7653 e7ae566f-a301-0410-adde-c780ea21d3b5
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/*
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* OpenVPN -- An application to securely tunnel IP networks
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* over a single TCP/UDP port, with support for SSL/TLS-based
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* session authentication and key exchange,
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* packet encryption, packet authentication, and
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* packet compression.
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*
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* Copyright (C) 2002-2011 OpenVPN Technologies, Inc. <sales@openvpn.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Maintain usage stats in a memory-mapped file
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*/
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#include "syshead.h"
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#if defined(ENABLE_MEMSTATS)
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#include <sys/mman.h>
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#include "error.h"
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#include "misc.h"
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#include "mstats.h"
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#include "memdbg.h"
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volatile struct mmap_stats *mmap_stats = NULL; /* GLOBAL */
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static char mmap_fn[128];
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void
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mstats_open(const char *fn)
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{
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void *data;
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ssize_t stat;
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int fd;
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struct mmap_stats ms;
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if (mmap_stats) /* already called? */
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return;
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/* verify that filename is not too long */
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if (strlen(fn) >= sizeof(mmap_fn))
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msg (M_FATAL, "mstats_open: filename too long");
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/* create file that will be memory mapped */
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fd = open (fn, O_CREAT | O_TRUNC | O_RDWR, S_IRUSR | S_IWUSR);
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if (fd < 0)
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{
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msg (M_ERR, "mstats_open: cannot open: %s", fn);
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return;
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}
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/* set the file to the correct size to contain a
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struct mmap_stats, and zero it */
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CLEAR(ms);
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ms.state = MSTATS_ACTIVE;
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stat = write(fd, &ms, sizeof(ms));
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if (stat != sizeof(ms))
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{
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msg (M_ERR, "mstats_open: write error: %s", fn);
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close(fd);
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return;
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}
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/* mmap the file */
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data = mmap(NULL, sizeof(struct mmap_stats), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (data == MAP_FAILED)
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{
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msg (M_ERR, "mstats_open: write error: %s", fn);
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close(fd);
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return;
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}
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/* close the fd (mmap now controls the file) */
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if (close(fd))
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{
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msg (M_ERR, "mstats_open: close error: %s", fn);
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}
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/* save filename so we can delete it later */
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strcpy(mmap_fn, fn);
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/* save a global pointer to memory-mapped region */
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mmap_stats = (struct mmap_stats *)data;
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msg (M_INFO, "memstats data will be written to %s", fn);
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}
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void
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mstats_close(void)
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{
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if (mmap_stats)
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{
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mmap_stats->state = MSTATS_EXPIRED;
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if (munmap((void *)mmap_stats, sizeof(struct mmap_stats)))
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msg (M_WARN | M_ERRNO, "mstats_close: munmap error");
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delete_file(mmap_fn);
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mmap_stats = NULL;
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}
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}
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#endif
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