> I'm interested in that too! First: after adding an entry to the unistd.h is > it necessary to recompile the kernel? And then? u will also have to add an entry in arch/<i386 for example>/kernel/entry.S and recompile the kernel if u want to have ur system call permenantly. But think twice before adding a new system call. It is not adivsible unless u really have a need. if u want to add a sytem call dynamically by directly altering the sys_call_table thru a module u need not add anything in unistd.h or entry.S and no need to recompile the kernel. >How applications can use > the new sys call? use _syscallX(....,...) macros defined in asm/unistd.h from the userland. if i m wrong others please clear it. regards, mohan. - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/