| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| #include "file_image.h" |
| |
| #include <unistd.h> |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| |
| #if defined(LINUX) |
| # ifndef __USE_BSD |
| # define __USE_BSD /* madvise, MADV_WILLNEED */ |
| # endif |
| #endif /* Linux */ |
| |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| |
| #include <string.h> |
| |
| /* |
| * file_image_open |
| */ |
| int file_image_open (file_image * image, const char * filename) |
| { |
| int result = 0; |
| int fd; |
| struct stat st; |
| void * p; |
| |
| if (image == 0) |
| return (EINVAL); |
| |
| image->m_base = MAP_FAILED, image->m_size = 0; |
| |
| if ((fd = open (filename, O_RDONLY)) == -1) |
| return (errno); |
| |
| if (fstat (fd, &st) == -1) |
| { |
| result = errno; |
| goto cleanup_and_leave; |
| } |
| |
| p = mmap (0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| if (p == MAP_FAILED) |
| { |
| result = errno; |
| goto cleanup_and_leave; |
| } |
| |
| image->m_base = p, image->m_size = st.st_size; |
| |
| cleanup_and_leave: |
| close (fd); |
| return (result); |
| } |
| |
| /* |
| * file_image_pagein. |
| */ |
| int file_image_pagein (file_image * image) |
| { |
| file_image w; |
| long s; |
| size_t k; |
| volatile char c = 0; |
| |
| if (image == 0) |
| return (EINVAL); |
| |
| if ((w.m_base = image->m_base) == 0) |
| return (EINVAL); |
| if ((w.m_size = image->m_size) == 0) |
| return (0); |
| |
| if (madvise (w.m_base, w.m_size, MADV_WILLNEED) == -1) |
| { |
| #ifndef MACOSX |
| return (errno); |
| #else |
| /* madvise MADV_WILLNEED need not succeed here */ |
| /* but that is fine */ |
| #endif |
| } |
| |
| |
| #ifndef MACOSX |
| if ((s = sysconf (_SC_PAGESIZE)) == -1) |
| s = 0x1000; |
| #else |
| s = getpagesize(); |
| #endif |
| |
| k = (size_t)(s); |
| while (w.m_size > k) |
| { |
| c ^= ((char*)(w.m_base))[0]; |
| w.m_base = (char*)(w.m_base) + k; |
| w.m_size -= k; |
| } |
| if (w.m_size > 0) |
| { |
| c ^= ((char*)(w.m_base))[0]; |
| w.m_base = (char*)(w.m_base) + w.m_size; |
| w.m_size -= w.m_size; |
| } |
| |
| return (0); |
| } |
| |
| /* |
| * file_image_close |
| */ |
| int file_image_close (file_image * image) |
| { |
| if (image == 0) |
| return (EINVAL); |
| |
| if (munmap (image->m_base, image->m_size) == -1) |
| return (errno); |
| |
| image->m_base = 0, image->m_size = 0; |
| return (0); |
| } |