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https://github.com/SerenityOS/serenity
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0dc9af5f7e
Also run it across the whole tree to get everything using the One True Style. We don't yet run this in an automated fashion as it's a little slow, but there is a snippet to do so in makeall.sh.
77 lines
1.5 KiB
C++
77 lines
1.5 KiB
C++
#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 String& file_name)
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: m_file_name(file_name)
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{
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m_size = PAGE_SIZE;
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m_fd = open(m_file_name.characters(), O_RDONLY | O_CLOEXEC);
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if (m_fd != -1) {
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struct stat st;
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fstat(m_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, m_fd, 0);
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if (m_map == MAP_FAILED)
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perror("");
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}
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#ifdef DEBUG_MAPPED_FILE
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dbgprintf("MappedFile{%s} := { m_fd=%d, m_size=%u, m_map=%p }\n", m_file_name.characters(), m_fd, m_size, m_map);
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#endif
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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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ASSERT(m_fd != -1);
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int rc = munmap(m_map, m_size);
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ASSERT(rc == 0);
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rc = close(m_fd);
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ASSERT(rc == 0);
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m_file_name = {};
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m_size = 0;
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m_fd = -1;
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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_file_name(move(other.m_file_name))
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, m_size(other.m_size)
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, m_fd(other.m_fd)
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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_fd = -1;
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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_file_name, other.m_file_name);
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swap(m_size, other.m_size);
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swap(m_fd, other.m_fd);
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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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