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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
commit | ed5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch) | |
tree | 7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /desktop/unx/source/file_image_unx.c | |
parent | Initial commit. (diff) | |
download | libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip |
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | desktop/unx/source/file_image_unx.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/desktop/unx/source/file_image_unx.c b/desktop/unx/source/file_image_unx.c new file mode 100644 index 000000000..4294a5761 --- /dev/null +++ b/desktop/unx/source/file_image_unx.c @@ -0,0 +1,121 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * 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 . + */ + +#include "file_image.h" + +#include <unistd.h> + +#include <errno.h> +#include <fcntl.h> + +#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 == NULL) + 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 (NULL, 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) +{ + long s = -1; + volatile char c =0; + size_t idx; + + if (image == NULL) + return EINVAL; + if (image->m_base == NULL) + return EINVAL; + if (image->m_size == 0) + return 0; + + if (madvise (image->m_base, image->m_size, MADV_WILLNEED) == -1) + return errno; + + s = sysconf (_SC_PAGESIZE); + if (s == -1) + s = 0x1000; + // force touching of each page despite the optimizer + for(idx = 0; idx < image->m_size; idx += (size_t)s) + { + c ^= ((volatile const char*)(image->m_base))[idx]; + } + c ^= ((volatile const char*)(image->m_base))[image->m_size-1]; + (void)c; // silence Clang 13 trunk -Wunused-but-set-variable + + return 0; +} + +/* + * file_image_close + */ +int file_image_close (file_image * image) +{ + if (image == NULL) + return EINVAL; + + if (munmap (image->m_base, image->m_size) == -1) + return errno; + + image->m_base = NULL; + image->m_size = 0; + return 0; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |