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erlexec c_src select_handler.hpp
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c_src/select_handler.hpp 

// vim:ts=4:sw=4:et

/*

Author: Christian Taedcke

Date:   2020-01-06

*/

#pragma once



#include "ei++.hpp"



struct SelectHandler {

    SelectHandler() : maxfd{0}, command_fd{-1}, sigchild_fd{-1} {

        FD_ZERO(&writefds);

        FD_ZERO(&readfds);

        FD_ZERO(&errfds);

    }

    

    void clear() { new (this) SelectHandler(); }

    

    void append_read_fd(int fd, FdType type = FdType::CHILD_PROC, bool _error = false) {

        FD_SET(fd, &readfds);

        if (fd > maxfd)

            maxfd = fd;

        switch (type) {

            case FdType::COMMAND:

                FD_SET(fd, &errfds);

                command_fd = fd;

                break;

            case FdType::SIGCHILD:

                sigchild_fd = fd;

                break;

            case FdType::CHILD_PROC:

                break;

        }

    }

    

    void append_write_fd(int fd) {

        FD_SET(fd, &writefds);

        if (fd > maxfd)

            maxfd = fd;

    }

    

    int wait_for_event(ei::TimeVal &timeout) {

        return select(maxfd+1, &readfds, &writefds, &errfds, &timeout);

    }

    

    bool is_readable(FdType type, int fd = -1) {

        switch (type) {

            case FdType::CHILD_PROC: return is_readable(fd);

            case FdType::COMMAND:    return is_readable(command_fd);

            case FdType::SIGCHILD:   return is_readable(sigchild_fd);

            default:                 return false;

        }

    }

    

    bool is_error(FdType type, int fd = -1) {

        switch (type) {

            case FdType::CHILD_PROC: return is_error(fd);

            case FdType::COMMAND:    return is_error(command_fd);

            case FdType::SIGCHILD:   return is_error(sigchild_fd);

            default:                 return false;

        }

    }

    

    bool is_readable(int fd) { return fd >= 0 && FD_ISSET(fd, &readfds);  }

    bool is_writable(int fd) { return fd >= 0 && FD_ISSET(fd, &writefds); }

    bool is_error   (int fd) { return fd >= 0 && FD_ISSET(fd, &errfds);   }

    

    int  size() const { return maxfd; }

    

private:

    fd_set readfds, writefds, errfds;

    int maxfd;

    int command_fd;

    int sigchild_fd;

};



using FdHandler = SelectHandler;