Messages in this thread | | | Date | Thu, 17 May 2001 02:11:21 +0200 | From | Erik Mouw <> | Subject | Re: your mail |
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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/
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