50 lines
2.3 KiB
HTML
50 lines
2.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
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<TITLE>Automount mini-Howto: The long wait for unmounting</TITLE>
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<LINK HREF="Automount-6.html" REL=next>
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<LINK HREF="Automount-4.html" REL=previous>
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<LINK HREF="Automount.html#toc5" REL=contents>
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<A HREF="Automount-6.html">Next</A>
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<A HREF="Automount.html#toc5">Contents</A>
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<HR>
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<H2><A NAME="s5">5. The long wait for unmounting</A></H2>
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<P>Some of you may be eyeing that 60 second timeout and thinking, <EM>that's a long
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time to wait to eject a floppy.. Maybe I'll just sync the disks and pop
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it out mounted and nobody will notice.</EM> Let me suggest <CODE>saner alternatives</CODE>.
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First of all, you can change the timeout. But that could be a little
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inefficient; telling the system to unmount stuff after only 15 seconds or
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whatever. Depending on your setup, you may be able to simply run the umount
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command as a normal user. But there is actually a way to ask the automount program to umount.
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If you send (with the program kill) the signal <CODE>SIGUSR1</CODE> to the automount process,
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it will unmount everything it can. But before people start making unmount
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buttons on their window managers, there's a little problem.
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<P>The automount process is run by root, and it will only accept signals from
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root. Half of the reason you're probably doing automounting is so you can
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mount and unmount without being root. It would be easy to make a suid-root
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C program which does the dirty deed. However, by using sudo it is possible
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to allow users to send the proper kill signal. The only problem is that
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sudo will not let you use to process subcommands, which you would have to
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do to find the current PID. You should have a program called killall, which
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will let you do this:
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<P>
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<PRE>
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ALL ALL=NOPASSWD:/usr/bin/killall -USR1 automount
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</PRE>
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Otherwise, you would have to allow your users to send -SIGUSR1 to all processes.
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That has various effects on programs; it will recycle some window managers,
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but kills xemacs. So here's hoping there's no buffer overruns in killall...
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<P>
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<HR>
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<A HREF="Automount-6.html">Next</A>
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