SYSCALL(2) SYSCALL(2) NAME syscall - indirect system call SYNOPSIS syscall(number, arg, ... ) (VAX) syscall(number, r0, r1, arg ... ) (PDP11) DESCRIPTION Syscall performs the system call whose assembly language interface has the specified number and arguments. On a PDP11 the first two arguments correspond to registers r0 and r1, regardless of whether the entry point really uses them. 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)). BUGS There is no way to simulate system calls such as pipe(2), which return values in register r1.