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Sorry for the newbie question..

Is it true that the ipc calls like
are not really system calls?

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"

Could some one explain why the ipc is implemented
this way rather that implementing them as individual
system calls as in UNIX.

Or is it the same way in UNIX

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