On Wed, Oct 17, 2001 at 05:29:41PM -0400, Hong Hsu wrote: > for /proc part. Does this also apply to Chapter 7 System Calls? I > want to add a system call, say nrprocess(), with these steps: 1) add an > entry in include/asm-i386/unistd.h 2) #insmod nrprocess.o The basic process is probably the same, or similar. I haven't checked the exact text. > but I don't see how the userland application know the new system call. it's just a matter of adding a little glue code. All system calls on x86 go through the int 0x80 instruction, with eax (I think) containing the number of the syscall (__NR_whatever), and the stack being correctly prepared. Check the glibc source (or diet libc is probably more readable) regards john -- "There are two kinds of fool. One says, 'This is old, and therefore good.' And one says, 'This is new, and therefore better'." - John Brunner - 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/
