mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-16 06:30:41 +00:00
73fdbba59c
This was a workaround to be able to build on case-insensitive file systems where it might get confused about <string.h> vs <String.h>. Let's just not support building that way, so String.h can have an objectively nicer name. :^)
72 lines
1.3 KiB
C++
72 lines
1.3 KiB
C++
#include <AK/String.h>
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#include <AK/MappedFile.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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//#define DEBUG_MAPPED_FILE
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namespace AK {
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MappedFile::MappedFile(const StringView& file_name)
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{
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m_size = PAGE_SIZE;
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int fd = open_with_path_length(file_name.characters_without_null_termination(), file_name.length(), O_RDONLY | O_CLOEXEC, 0);
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if (fd == -1) {
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perror("open");
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return;
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}
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struct stat st;
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fstat(fd, &st);
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m_size = st.st_size;
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m_map = mmap(nullptr, m_size, PROT_READ, MAP_SHARED, fd, 0);
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if (m_map == MAP_FAILED)
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perror("mmap");
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#ifdef DEBUG_MAPPED_FILE
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dbgprintf("MappedFile{%s} := { fd=%d, m_size=%u, m_map=%p }\n", file_name.characters(), fd, m_size, m_map);
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#endif
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close(fd);
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}
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MappedFile::~MappedFile()
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{
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unmap();
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}
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void MappedFile::unmap()
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{
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if (!is_valid())
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return;
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int rc = munmap(m_map, m_size);
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ASSERT(rc == 0);
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m_size = 0;
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m_map = (void*)-1;
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}
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MappedFile::MappedFile(MappedFile&& other)
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: m_size(other.m_size)
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, m_map(other.m_map)
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{
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other.m_size = 0;
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other.m_map = (void*)-1;
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}
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MappedFile& MappedFile::operator=(MappedFile&& other)
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{
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if (this == &other)
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return *this;
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unmap();
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swap(m_size, other.m_size);
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swap(m_map, other.m_map);
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return *this;
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}
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}
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