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c110cf193d
Instead of computing the path length inside the syscall handler, let the caller do that work. This allows us to implement to new variants of open() and creat(), called open_with_path_length() and creat_with_path_length(). These are suitable for use with e.g StringView.
74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
#include <AK/AKString.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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m_fd = open_with_path_length(file_name.characters_without_null_termination(), file_name.length(), O_RDONLY | O_CLOEXEC, 0);
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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", 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_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_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_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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