Function daemonLoop

src/lib/core/LLauncher.cpp:29–102

static pid_t daemonGID = -1;

static Int32 daemonLoop()
{
    close(pipeA[1]);
    close(pipeB[0]);

    fcntl(pipeA[0], F_SETFD, fcntl(pipeA[0], F_GETFD) | FD_CLOEXEC);
    fcntl(pipeB[1], F_SETFD, fcntl(pipeB[1], F_GETFD) | FD_CLOEXEC);

    if (setpgid(0, 0) == 0)
        daemonGID = getpgrp();

    pollfd fds;
    fds.events = POLLIN;
    fds.revents = 0;
    fds.fd = pipeA[0];

    // Read messages from the parent
    std::string cmd = "";
    UChar8 c;

    while (true)
    {
        if (poll(&fds, 1, -1) != 1)
            return 1;

        Int32 n = read(pipeA[0], &c, sizeof(c));

        // Closed pipe
        if (n == 0)
            return 0;

        while (n > 0)
        {
            // Reached end of command
            if (c == '\0')
            {
                pid_t pid = fork();

                if (pid == 0)
                    exit(system(cmd.c_str()));
                else if (pid > 0)
                {
                    // Send the launched app PID to the compositor
                    Char8 buffer[32];
                    sprintf(buffer, "%d", pid);
                    Char8 *ptr = buffer;

                    while (true)
                    {
                        ssize_t w = write(pipeB[1], ptr, sizeof(c));

                        if (*ptr == '\0')
                            break;

                        if (w > 0)
                            ptr += w;
                    }
                }