156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/****************************************************************************
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* netutils/webserver/httpd_mmap.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Header Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <debug.h>
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#include "netutils/httpd.h"
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#include "httpd.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int httpd_mmap_open(const char *name, struct httpd_fs_file *file)
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{
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char path[PATH_MAX];
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struct stat st;
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if (sizeof path < snprintf(path, sizeof path, "%s%s",
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CONFIG_NETUTILS_HTTPD_PATH, name))
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{
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errno = ENAMETOOLONG;
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return ERROR;
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}
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/* XXX: awaiting fstat to avoid a race */
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if (-1 == stat(path, &st))
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{
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return ERROR;
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}
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if (S_ISDIR(st.st_mode))
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{
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errno = EISDIR;
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return ERROR;
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}
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if (!S_ISREG(st.st_mode))
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{
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errno = ENOENT;
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return ERROR;
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}
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if (st.st_size > INT_MAX)
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{
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errno = EFBIG;
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return ERROR;
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}
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file->len = (int) st.st_size;
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/* SUS3: "If len is zero, mmap() shall fail and no mapping shall be established." */
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if (st.st_size == 0)
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{
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return OK;
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}
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file->fd = open(path, O_RDONLY);
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if (file->fd == -1)
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{
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return ERROR;
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}
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file->data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED | MAP_FILE, file->fd, 0);
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if (file->data == MAP_FAILED)
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{
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(void) close(file->fd);
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return ERROR;
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}
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return OK;
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}
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int httpd_mmap_close(struct httpd_fs_file *file)
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{
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if (file->len == 0)
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{
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return OK;
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}
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#ifdef CONFIG_FS_RAMMAP
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if (-1 == munmap(file->data, file->len))
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{
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return ERROR;
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}
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#endif
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if (-1 == close(file->fd))
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{
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return ERROR;
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}
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return OK;
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}
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