给新进程取名字

extern char *__progname;
......
{
pid = fork();
    if (pid == 0)
    {
        pid = fork();
        if (pid > 0)
        {
            exit(0);
        }
        else
        {
            functionb();
            char newp_name[] = "newnameOK";
            __progname = newp_name; //新进程的名字。


            setsid();

            chdir("/");
            umask(0);

        }
}