A pipe is a mechanism for sending information from one process to another. In its simplest form, a pipe is a file (in RAM) that one process can write to, and the other can read from. The file starts out empty, and no bytes can be read from the pipe until bytes are written to it.
Let's look at the following example:
#include <string.h>#include <unistd.h>#include <sys/wait.h>#include <array>#include <iostream>#include <string_view>class mypipe{ std::array<int, 2> m_handles;public: mypipe() { if (pipe(m_handles.data()) < 0) { exit(1); } } ~mypipe() { close(m_handles.at(0)); close(m_handles.at(1)); } std::string read() { std::array<char, 256> buf; std::size_t bytes = ::read(m_handles.at(0), buf.data(), buf.size()); if (bytes > 0) ...
