571d9493ad
A fork/exec could happen between open and fcntl, leaking a file descriptor. Using O_CLOEXEC fixes this and as a side effect simplifies the code. NetBSD already had this (I checked this after making the change myself). Reviewed by: gabor
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* $FreeBSD$ */
|
|
/* $NetBSD: citrus_mmap.c,v 1.3 2005/01/19 00:52:37 mycroft Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c)2003 Citrus Project,
|
|
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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>
|
|
#include <sys/mman.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "citrus_namespace.h"
|
|
#include "citrus_region.h"
|
|
#include "citrus_mmap.h"
|
|
|
|
int
|
|
_citrus_map_file(struct _citrus_region * __restrict r,
|
|
const char * __restrict path)
|
|
{
|
|
struct stat st;
|
|
void *head;
|
|
int fd, ret;
|
|
|
|
ret = 0;
|
|
|
|
_region_init(r, NULL, 0);
|
|
|
|
if ((fd = open(path, O_RDONLY | O_CLOEXEC)) == -1)
|
|
return (errno);
|
|
|
|
if (fstat(fd, &st) == -1) {
|
|
ret = errno;
|
|
goto error;
|
|
}
|
|
if (!S_ISREG(st.st_mode)) {
|
|
ret = EOPNOTSUPP;
|
|
goto error;
|
|
}
|
|
|
|
head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE,
|
|
fd, (off_t)0);
|
|
if (head == MAP_FAILED) {
|
|
ret = errno;
|
|
goto error;
|
|
}
|
|
_region_init(r, head, (size_t)st.st_size);
|
|
|
|
error:
|
|
(void)close(fd);
|
|
return (ret);
|
|
}
|
|
|
|
void
|
|
_citrus_unmap_file(struct _citrus_region *r)
|
|
{
|
|
|
|
if (_region_head(r) != NULL) {
|
|
(void)munmap(_region_head(r), _region_size(r));
|
|
_region_init(r, NULL, 0);
|
|
}
|
|
}
|