Part 3 of the Linux Newbie Administrator Guide
3.2.7 My mp3 player chokes. The sound is kind of interrupted (how to set suid).
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chmod a+s /usr/bin/xmms will do the trick for the xmms program. The output from ls -l /usr/bin/xmms on my computer is now: -rwsr-sr-x 1 root root 908k Feb 22 2000 /usr/bin/xmms The first "s" indicates that the substitute-user-id (suid) bit is set. The second "s" indicates that the substitute-group-id (sgid) is also set. Thus anybody who executes xmms is given the effective user id of the program owner and effective group id of the owner group, which in the example above is the user "root" and the group "root". Setting the suid for a program could possibly become a security hole in your system. This is unlikely the case on a closed home network and when setting suid for a program of which the origin is well traceable. However, even at home, I wouldn't suid a piece of code of which the origin is uncertain, even if the setup instructions urged me to do so. Also, it is definitely a very bad idea to suid too many executables on your system--it defies the whole idea of UNIX security. Some programs do, however, require suid for proper functioning, for example kppp (the popular modem "ppp" connection utility under the KDE graphical-user-interface desktop). This is because they require direct access to the hardware--something only root is allowed to. If you have constant problems with a smooth performance of your system, or some "real time hardware" (e.g., CD writer) tends to crash, try to reduce the number of daemons on your Linux system. Run (as root) setup (RH specific command) and disable all the "services" that you don't really require. Ultimately, you can switch to the command line, shut down the GUI (command init 3 as root), and then the performance should surely be better even. For those who need (like) their Linux to be a "universal" operating system (workstation, server, office computer, game box, mulimedia, etc, everything at the same time), there are dedicated Linux kernel patches: "low latancy patch" and "pre-emptive kernel patch" which aggresively atack the "latency" problem that overloaded systems exhibit. Next > 3.3 Job scheduling with "&", "at", "batch", and cron
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