mirror of
https://github.com/ClickHouse/ClickHouse.git
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92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
#include <fcntl.h>
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#include <IO/ReadBufferFromFile.h>
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#include <IO/WriteHelpers.h>
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#include <Common/ProfileEvents.h>
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#include <errno.h>
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namespace ProfileEvents
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{
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extern const Event FileOpen;
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int FILE_DOESNT_EXIST;
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extern const int CANNOT_OPEN_FILE;
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extern const int CANNOT_CLOSE_FILE;
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}
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ReadBufferFromFile::ReadBufferFromFile(
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const std::string & file_name_,
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size_t buf_size,
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int flags,
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char * existing_memory,
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size_t alignment)
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: ReadBufferFromFileDescriptor(-1, buf_size, existing_memory, alignment), file_name(file_name_)
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{
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ProfileEvents::increment(ProfileEvents::FileOpen);
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#ifdef __APPLE__
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bool o_direct = (flags != -1) && (flags & O_DIRECT);
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if (o_direct)
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flags = flags & ~O_DIRECT;
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#endif
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fd = ::open(file_name.c_str(), flags == -1 ? O_RDONLY | O_CLOEXEC : flags | O_CLOEXEC);
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if (-1 == fd)
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throwFromErrnoWithPath("Cannot open file " + file_name, file_name,
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errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
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#ifdef __APPLE__
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if (o_direct)
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{
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if (fcntl(fd, F_NOCACHE, 1) == -1)
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throwFromErrnoWithPath("Cannot set F_NOCACHE on file " + file_name, file_name, ErrorCodes::CANNOT_OPEN_FILE);
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}
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#endif
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}
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ReadBufferFromFile::ReadBufferFromFile(
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int & fd_,
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const std::string & original_file_name,
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size_t buf_size,
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char * existing_memory,
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size_t alignment)
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:
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ReadBufferFromFileDescriptor(fd_, buf_size, existing_memory, alignment),
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file_name(original_file_name.empty() ? "(fd = " + toString(fd_) + ")" : original_file_name)
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{
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fd_ = -1;
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}
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ReadBufferFromFile::~ReadBufferFromFile()
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{
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if (fd < 0)
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return;
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::close(fd);
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}
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void ReadBufferFromFile::close()
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{
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if (fd < 0)
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return;
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if (0 != ::close(fd))
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throw Exception("Cannot close file", ErrorCodes::CANNOT_CLOSE_FILE);
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fd = -1;
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metric_increment.destroy();
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}
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}
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