NAME

syscall − indirect system call

SYNTAX

syscall(number, arg, ...)  (VAX-11)

DESCRIPTION

Syscall performs the system call whose assembly language interface has the specified number, register arguments r0 and r1 and further arguments arg.

The r0 value of the system call is returned. 

DIAGNOSTICS

When the C-bit is set, syscall returns −1 and sets the external variable errno (see intro(2)).

RESTRICTIONS

There is no way to simulate system calls such as pipe(2), which return values in register r1.