Running a child process in C++

Try to follow ruby pattern.

You want to capture stdout as a string (and inherit stderr):

from How to execute a command and get the output of command within C++ using popen:

NOTE: stderr not inherited with code below.

std::string exec(std::string command) {
    char buffer[128];
    std::string result;

    // Open pipe to file
    FILE* pipe = popen(command.c_str(), "r");
    if (!pipe) {
        return "popen failed!";
    }

    // read till end of process:
    while (!feof(pipe)) {
        // use buffer to read and add to result
        if (fgets(buffer, 128, pipe) != NULL)
            result += buffer;
    }

    pclose(pipe);
    return result;
}

Written on September 9, 2020, Last update on September 9, 2020

c++ shell process