Hi, All What's the difference between /usr/lib/libc.so and /lib/libc.so.6? I have used "rpm -qf" command and find that the former comes from glibc-devel-<version>, while the latter comes from glibc-2.4. Which is the Glibc and who provide the "system call" wrapper function such as open()? Thanks, Regards, Cheng -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/