syscall

Calls the operating system function identified by _num_ and
returns the result of the function or raises SystemCallError if
it failed.

Arguments for the function can follow _num_. They must be either
+String+ objects or +Integer+ objects. A +String+ object is passed
as a pointer to the byte sequence. An +Integer+ object is passed
as an integer whose bit size is same as a pointer.
Up to nine parameters may be passed (14 on the Atari-ST).

The function identified by _num_ is system
dependent. On some Unix systems, the numbers may be obtained from a
header file called <code>syscall.h</code>.

   syscall 4, 1, "hello\n", 6   # '4' is write(2) on our box

<em>produces:</em>

   hello

Calling +syscall+ on a platform which does not have any way to
an arbitrary system function just fails with NotImplementedError.