On Wed, May 16, 2001 at 08:05:38AM -0700, siva prasad wrote:
> Is it true that the ipc calls like
> msgget(),shmget()...
> are not really system calls?
No, they all use a system call, but the system call is the same for all
functions.
> Cos in the file "asm/unistd.h" where the
> system calls are listed as __NR_xxx we dont find
> the appropriate listing for the ipc calls.
> What I guessed was that all the ipc calls are
> clubbed under the 'int ipc()' system call and this
> is well listed in the "asm/unistd.h"
Right, they all use __NR_ipc. See sys_ipc() in
arch/i386/kernel.sys_i386.c, especially the comment right above the
function...
> Could some one explain why the ipc is implemented
> this way rather that implementing them as individual
> system calls as in UNIX.
Probably because the original designer liked it this way and nobody
cared enough to do it otherwise.
> Or is it the same way in UNIX
I don't know, I don't have Unix source available.
Erik
-- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Wed May 23 2001 - 21:00:21 EST