Merge branch 'cmake_test_wr' into 'master'

cmake_minimum_required(VERSION 3.7)

project(ifs_test)

cmake_minimum_required(VERSION 3.6)

project(ifs_test LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 14)

set(CMAKE_EXPORT_COMPILE_COMMANDS 1)

set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(MPI REQUIRED)

set(CMAKE_EXPORT_COMPILE_COMMANDS 1)

include_directories(${MPI_INCLUDE_PATH})

set(SOURCE_FILES main.cpp)

set(SOURCE_FILES_MPI main_MPI.cpp)

set(SOURCE_FILES_IO main_IO_testing.cpp)

set(SOURCE_FILES_TEMP main_temp.cpp)

add_executable(ifs_test ${SOURCE_FILES})

add_executable(ifs_test_MPI ${SOURCE_FILES_MPI})

set(SOURCE_FILES_IO main_IO_testing.cpp)

add_executable(ifs_test_IO ${SOURCE_FILES_IO})

set(SOURCE_FILES_TEMP main_temp.cpp)

add_executable(ifs_test_temp ${SOURCE_FILES_TEMP})

target_link_libraries(ifs_test_MPI ${MPI_CXX_LIBRARIES})

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add_executable(ifs_test_wr wr_test.cpp)

find_package(MPI)

if(${MPI_FOUND})

    set(SOURCE_FILES_MPI main_MPI.cpp)

    add_executable(ifs_test_MPI ${SOURCE_FILES_MPI})

    target_link_libraries(ifs_test_MPI MPI::MPI_CXX)

endif()

 No newline at end of file

/* Simple Write/Read Test

 *

 * - open a file

 * - write some content

 * - close

 * - open the same file in read mode

 * - read the content

 * - check if the content match

 * - close

 */

#include <iostream>

#include <fcntl.h>

#include <unistd.h>

#include <cstring>

using namespace std;

int main(int argc, char* argv[]) {

    string p = "/tmp/mountdir/file"s;

    char buffIn[] = "oops.";

    char *buffOut = new char[strlen(buffIn)];

    /* Write the file */

    auto fd = open(p.c_str(), O_WRONLY | O_CREAT, 0777);

    if(fd < 0){

        cerr << "Error opening file (write)" << endl;

        return -1;

    }

    auto nw = write(fd, buffIn, strlen(buffIn));

    if(nw != strlen(buffIn)){

        cerr << "Error writing file" << endl;

        return -1;

    }

    if(close(fd) != 0){

        cerr << "Error closing file" << endl;

        return -1;

    }

    /* Read the file back */

    fd = open(p.c_str(), O_RDONLY);

    if(fd < 0){

        cerr << "Error opening file (read)" << endl;

        return -1;

    }

    auto nr = read(fd, buffOut, strlen(buffIn));

    if(nr != strlen(buffIn)){

        cerr << "Error reading file" << endl;

        return -1;

    }

    if(strncmp( buffIn, buffOut, strlen(buffIn)) != 0){

        cerr << "File content mismatch" << endl;

        return -1;

    }

    close(fd);

}