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https://github.com/ClickHouse/ClickHouse.git
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113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
#include <Common/PipeFDs.h>
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#include <Common/Exception.h>
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#include <Common/formatReadable.h>
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#include <common/logger_useful.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string>
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#include <algorithm>
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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 CANNOT_PIPE;
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extern const int CANNOT_FCNTL;
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extern const int LOGICAL_ERROR;
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}
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void LazyPipeFDs::open()
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{
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for (int & fd : fds_rw)
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if (fd >= 0)
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throw Exception("Pipe is already opened", ErrorCodes::LOGICAL_ERROR);
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#ifndef __APPLE__
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if (0 != pipe2(fds_rw, O_CLOEXEC))
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throwFromErrno("Cannot create pipe", ErrorCodes::CANNOT_PIPE);
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#else
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if (0 != pipe(fds_rw))
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throwFromErrno("Cannot create pipe", ErrorCodes::CANNOT_PIPE);
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if (0 != fcntl(fds_rw[0], F_SETFD, FD_CLOEXEC))
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throwFromErrno("Cannot setup auto-close on exec for read end of pipe", ErrorCodes::CANNOT_FCNTL);
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if (0 != fcntl(fds_rw[1], F_SETFD, FD_CLOEXEC))
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throwFromErrno("Cannot setup auto-close on exec for write end of pipe", ErrorCodes::CANNOT_FCNTL);
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#endif
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}
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void LazyPipeFDs::close()
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{
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for (int & fd : fds_rw)
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{
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if (fd < 0)
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continue;
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if (0 != ::close(fd))
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throwFromErrno("Cannot close pipe", ErrorCodes::CANNOT_PIPE);
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fd = -1;
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}
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}
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PipeFDs::PipeFDs()
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{
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open();
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}
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LazyPipeFDs::~LazyPipeFDs()
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{
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try
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{
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close();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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}
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void LazyPipeFDs::setNonBlocking()
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{
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int flags = fcntl(fds_rw[1], F_GETFL, 0);
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if (-1 == flags)
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throwFromErrno("Cannot get file status flags of pipe", ErrorCodes::CANNOT_FCNTL);
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if (-1 == fcntl(fds_rw[1], F_SETFL, flags | O_NONBLOCK))
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throwFromErrno("Cannot set non-blocking mode of pipe", ErrorCodes::CANNOT_FCNTL);
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}
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void LazyPipeFDs::tryIncreaseSize(int desired_size)
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{
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#if defined(OS_LINUX)
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Poco::Logger * log = &Poco::Logger::get("Pipe");
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/** Increase pipe size to avoid slowdown during fine-grained trace collection.
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*/
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int pipe_size = fcntl(fds_rw[1], F_GETPIPE_SZ);
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if (-1 == pipe_size)
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{
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if (errno == EINVAL)
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{
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LOG_INFO(log, "Cannot get pipe capacity, " << errnoToString(ErrorCodes::CANNOT_FCNTL) << ". Very old Linux kernels have no support for this fcntl.");
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/// It will work nevertheless.
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}
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else
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throwFromErrno("Cannot get pipe capacity", ErrorCodes::CANNOT_FCNTL);
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}
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else
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{
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for (errno = 0; errno != EPERM && pipe_size < desired_size; pipe_size *= 2)
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if (-1 == fcntl(fds_rw[1], F_SETPIPE_SZ, pipe_size * 2) && errno != EPERM)
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throwFromErrno("Cannot increase pipe capacity to " + std::to_string(pipe_size * 2), ErrorCodes::CANNOT_FCNTL);
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LOG_TRACE(log, "Pipe capacity is " << formatReadableSizeWithBinarySuffix(std::min(pipe_size, desired_size)));
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}
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#else
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(void)desired_size;
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#endif
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}
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}
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