syscall(*args) public

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 syscall.h.

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



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


syscall is essentially unsafe and unportable. Feel free to shoot your foot. DL (Fiddle) library is preferred for safer and a bit more portable programming.

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