mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-21 19:45:56 +03:00
7c9da5709d
to enable DMLProc to survive rollbacks on startup. The patch also fixes linter warnings in service.h and pipe.h.
100 lines
2.0 KiB
C++
100 lines
2.0 KiB
C++
/* Copyright (C) 2020 MariaDB Corporation
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#pragma once
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/*
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A helper class to hold the file descriptors returned from a pipe() call.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <cerrno>
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#include <string>
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class Pipe
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{
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int fd[2];
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public:
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Pipe()
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{
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fd[0] = 0;
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fd[1] = 0;
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}
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~Pipe()
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{
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close();
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}
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bool is_open_for_read() const
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{
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return fd[0] > 0;
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}
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bool is_open_for_write() const
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{
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return fd[1] > 0;
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}
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bool open()
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{
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return ::pipe(fd) == -1;
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}
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bool init() // TODO: remove this
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{
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return open();
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}
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ssize_t read(char* str, size_t nbytes)
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{
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return ::read(fd[0], str, nbytes);
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}
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ssize_t readtm(const struct timeval& tv, void* buf, size_t nbytes)
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{
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fd_set rfds;
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FD_ZERO(&rfds);
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FD_SET(fd[0], &rfds);
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struct timeval tmptv = tv;
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int retval = select(fd[0] + 1, &rfds, nullptr, nullptr, &tmptv);
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if (retval == -1)
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return -1;
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if (!retval)
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{
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errno = ETIME;
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return -1;
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}
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return ::read(fd[0], buf, nbytes);
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}
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ssize_t write(const char* str, size_t nbytes)
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{
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return ::write(fd[1], str, nbytes);
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}
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ssize_t write(const std::string& str)
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{
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return write(str.data(), str.length());
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}
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void close()
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{
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if (fd[0])
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{
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::close(fd[0]);
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fd[0] = 0;
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}
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if (fd[1])
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{
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::close(fd[1]);
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fd[1] = 0;
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}
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}
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};
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