Package: laptop-mode Severity: wishlist Hi !
Some programs, like emacs, call fsync() syscall just after saving a file. When running on battery, this wakes up the hard disk. laptop-mode should provide an option to avoid this behavior. Currently, I have written a very simple lib called libnofsync.so and which simplies redefines the function fsync() to return 0 (it should be compiled with -fPIC). I put it in /lib and setgid it (because, it should work on setuid programs). I run ldconfig -v. Then, I create /etc/ld.so.preload which contains "/lib/libnofsync.so" Now, each application which is trying to call fsync() syscall will in fact call the modified one which does nothing. When on AC, ld.so.preload could be removed (or reverted to the original version). Or we could use something like what is done with syslog. Putting libnofsync.so in /lib is very important. If it was in /usr/lib, and /usr was mounted separetely, init could be unable to run ! -- System Information: Debian Release: 3.1 APT prefers unstable APT policy: (990, 'unstable') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.10-zoro.2 Locale: [EMAIL PROTECTED], [EMAIL PROTECTED] (charmap=ISO-8859-15)
