/ C library -- wait / pid = wait(0); / or, / pid = wait(&status); / / pid == -1 if error / status indicates fate of process, if given .globl _wait, cerror _wait: mov r5,-(sp) mov sp,r5 sys wait bec 1f jmp cerror 1: tst 4(r5) beq 1f mov r1,*4(r5) / status return 1: mov (sp)+,r5 rts pc