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map_shared.c
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map_shared.c
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/* map_shared.c -- memory-mapping routines.
*
* (C) Copyright 1994 by Carnegie Mellon University
*
* All Rights Reserved
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of Carnegie
* Mellon University not be used in advertising or publicity
* pertaining to distribution of the software without specific,
* written prior permission. Carnegie Mellon University makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <syslog.h>
#include "sysexits.h"
#define SLOP (8*1024)
/*
* Create/refresh mapping of file
*/
map_refresh(fd, onceonly, base, len, newlen, name, mboxname)
int fd;
int onceonly;
char **base;
unsigned long *len;
unsigned long newlen;
char *name;
char *mboxname;
{
/* Already mapped in */
if (*len >= newlen) return;
if (*len) munmap(*base, *len);
if (!onceonly) {
newlen = (newlen + 2*SLOP - 1) & ~(SLOP-1);
}
*base = (char *)mmap((caddr_t)0, newlen, PROT_READ, MAP_SHARED
#ifdef MAP_FILE
| MAP_FILE
#endif
#ifdef MAP_VARIABLE
| MAP_VARIABLE
#endif
, fd, 0L);
if (*base == (char *)-1) {
char buf[80];
syslog(LOG_ERR, "IOERROR: mapping %s file%s%s: %m", name,
mboxname ? " for " : "", mboxname ? mboxname : "");
sprintf(buf, "failed to mmap %s file", name);
fatal(buf, EX_IOERR);
}
*len = newlen;
}
/*
* Destroy mapping of file
*/
map_free(base, len)
char **base;
unsigned long *len;
{
if (*len) munmap(*base, *len);
*base = 0;
*len = 0;
}

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