Method read

src/python/subprocess.cpp:66–74

    }

    ssize_t SubProcess::read(char* buf, size_t len) {
        if (stdout_fd_ < 0)
            return -1;

        const ssize_t n = ::read(stdout_fd_, buf, len);
        if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
            return 0;
        return n;
    }

    bool SubProcess::is_running() const {
        if (pid_ <= 0)