Using readline and signal() to simulate jobs program on Linux

Question

I am writing a simple shell implementation. I am trying to implement a shell functionality that would allow to handle signals such as the CTRL + Z and stop the ongoing process. The process could be later continued using a different functionality. Everything works fine, except that when I am trying to stop the "man ls" process and then later restore it, the text from "man ls" does not come back to the screen.

int m_fg(char **args)
{
    // this just checks if there are any processes on stack that could be "foregrounded"
    if(!pnumber)
       return 1;
    int status;
    // the kill function sends a signal to the child process to be continued
    kill(pvector[pnumber - 1], SIGCONT);
    if(getpid() != pvector[pnumber - 1])
    {
        signal(SIGCHLD, sigstopm);
        waitpid(pvector[pnumber - 1], &status, WUNTRACED);
    }
    if(WIFEXITED(status))
        pnumber--;
    return 1;
}

I think the problem is connected with the man function and the way it is displayed on the screen, since other functions such as htop or vim function properly. Another important thing to mention is that I am using a readline library.

question from:https://stackoverflow.com/questions/65846195/using-readline-and-signal-to-simulate-jobs-program-on-linux

Answer 1

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