LCOV - code coverage report
Current view: top level - tests/integration/harness/gkfs.io - readv.cpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 35 47 74.5 %
Date: 2024-04-23 00:09:24 Functions: 3 3 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   Copyright 2018-2024, Barcelona Supercomputing Center (BSC), Spain
       3             :   Copyright 2015-2024, Johannes Gutenberg Universitaet Mainz, Germany
       4             : 
       5             :   This software was partially supported by the
       6             :   EC H2020 funded project NEXTGenIO (Project ID: 671951, www.nextgenio.eu).
       7             : 
       8             :   This software was partially supported by the
       9             :   ADA-FS project under the SPPEXA project funded by the DFG.
      10             : 
      11             :   This file is part of GekkoFS.
      12             : 
      13             :   GekkoFS is free software: you can redistribute it and/or modify
      14             :   it under the terms of the GNU General Public License as published by
      15             :   the Free Software Foundation, either version 3 of the License, or
      16             :   (at your option) any later version.
      17             : 
      18             :   GekkoFS is distributed in the hope that it will be useful,
      19             :   but WITHOUT ANY WARRANTY; without even the implied warranty of
      20             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      21             :   GNU General Public License for more details.
      22             : 
      23             :   You should have received a copy of the GNU General Public License
      24             :   along with GekkoFS.  If not, see <https://www.gnu.org/licenses/>.
      25             : 
      26             :   SPDX-License-Identifier: GPL-3.0-or-later
      27             : */
      28             : 
      29             : /* C++ includes */
      30             : #include <CLI/CLI.hpp>
      31             : #include <nlohmann/json.hpp>
      32             : #include <memory>
      33             : #include <fmt/format.h>
      34             : #include <commands.hpp>
      35             : #include <reflection.hpp>
      36             : #include <serialize.hpp>
      37             : #include <binary_buffer.hpp>
      38             : 
      39             : /* C includes */
      40             : #include <sys/types.h>
      41             : #include <sys/stat.h>
      42             : #include <sys/uio.h>
      43             : #include <fcntl.h>
      44             : #include <unistd.h>
      45             : 
      46             : using json = nlohmann::json;
      47             : 
      48         536 : struct readv_options {
      49             :     bool verbose{};
      50             :     std::string pathname;
      51             :     ::size_t count_0;
      52             :     ::size_t count_1;
      53             : 
      54             :     REFL_DECL_STRUCT(readv_options, REFL_DECL_MEMBER(bool, verbose),
      55             :                      REFL_DECL_MEMBER(std::string, pathname),
      56             :                      REFL_DECL_MEMBER(::size_t, count_0),
      57             :                      REFL_DECL_MEMBER(::size_t, count_1));
      58             : };
      59             : 
      60           1 : struct readv_output {
      61             :     ::ssize_t retval;
      62             :     io::buffer buf_0;
      63             :     io::buffer buf_1;
      64             :     int errnum;
      65             : 
      66             :     REFL_DECL_STRUCT(readv_output, REFL_DECL_MEMBER(::size_t, retval),
      67             :                      REFL_DECL_MEMBER(void*, buf_0),
      68             :                      REFL_DECL_MEMBER(void*, buf_1),
      69             :                      REFL_DECL_MEMBER(int, errnum));
      70             : };
      71             : 
      72             : void
      73           1 : to_json(json& record, const readv_output& out) {
      74           1 :     record = serialize(out);
      75           1 : }
      76             : 
      77             : void
      78           1 : readv_exec(const readv_options& opts) {
      79             : 
      80           1 :     auto fd = ::open(opts.pathname.c_str(), O_RDONLY);
      81             : 
      82           1 :     if(fd == -1) {
      83           0 :         if(opts.verbose) {
      84           0 :             fmt::print(
      85             :                     "readv(pathname=\"{}\", count_0={}, count_1={}) = {}, errno: {} [{}]\n",
      86           0 :                     opts.pathname, opts.count_0, opts.count_1, fd, errno,
      87           0 :                     ::strerror(errno));
      88           0 :             return;
      89             :         }
      90             : 
      91           0 :         json out = readv_output{fd, nullptr, nullptr, errno};
      92           0 :         fmt::print("{}\n", out.dump(2));
      93             : 
      94           0 :         return;
      95             :     }
      96             : 
      97           2 :     io::buffer buf_0(opts.count_0);
      98           2 :     io::buffer buf_1(opts.count_1);
      99             : 
     100           1 :     struct iovec iov[2];
     101             : 
     102           1 :     iov[0].iov_base = buf_0.data();
     103           1 :     iov[1].iov_base = buf_1.data();
     104             : 
     105           1 :     iov[0].iov_len = opts.count_0;
     106           1 :     iov[1].iov_len = opts.count_1;
     107             : 
     108           1 :     auto rv = ::readv(fd, iov, 2);
     109             : 
     110           1 :     if(opts.verbose) {
     111           0 :         fmt::print(
     112             :                 "readv(pathname=\"{}\", count_0={}, count_1={}) = {}, errno: {} [{}]\n",
     113           0 :                 opts.pathname, opts.count_0, opts.count_1, rv, errno,
     114           0 :                 ::strerror(errno));
     115           0 :         return;
     116             :     }
     117             : 
     118           1 :     json out = readv_output{rv, (rv != -1 ? buf_0 : nullptr),
     119           3 :                             (rv != -1 ? buf_1 : nullptr), errno};
     120           2 :     fmt::print("{}\n", out.dump(2));
     121             : }
     122             : 
     123             : void
     124         268 : readv_init(CLI::App& app) {
     125             : 
     126             :     // Create the option and subcommand objects
     127         268 :     auto opts = std::make_shared<readv_options>();
     128         268 :     auto* cmd = app.add_subcommand("readv", "Execute the readv() system call");
     129             : 
     130             :     // Add options to cmd, binding them to opts
     131         268 :     cmd->add_flag("-v,--verbose", opts->verbose,
     132         536 :                   "Produce human readable output");
     133             : 
     134         536 :     cmd->add_option("pathname", opts->pathname, "Directory name")
     135             :             ->required()
     136         536 :             ->type_name("");
     137             : 
     138         268 :     cmd->add_option("count_0", opts->count_0,
     139         536 :                     "Number of bytes to read to buffer 0")
     140             :             ->required()
     141         536 :             ->type_name("");
     142             : 
     143         268 :     cmd->add_option("count_1", opts->count_1,
     144         536 :                     "Number of bytes to read to buffer 1")
     145             :             ->required()
     146         536 :             ->type_name("");
     147             : 
     148        1073 :     cmd->callback([opts]() { readv_exec(*opts); });
     149         268 : }

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