usr/src/libc/sys/ioctl.s

/ C library -- ioctl

/ ioctl(fdes, command, arg)
/ struct * arg;
/
/ result == -1 if error

.globl  _ioctl, cerror
.ioctl  = 54.

_ioctl:
        mov     r5,-(sp)
        mov     sp,r5
        mov     4(r5),0f
        mov     6(r5),0f+2
        mov     8(r5),0f+4
        sys     0; 9f
        bec     1f
        jmp     cerror
1:
        mov     (sp)+,r5
        clr     r0
        rts     pc
.data
9:
        sys     .ioctl; 0:..; ..; ..