/* kill.c - kill */ #include <conf.h> #include <kernel.h> #include <proc.h> #include <sem.h> #include <mem.h> #include <io.h> /*------------------------------------------------------------------------ * kill -- kill a process and remove it from the system *------------------------------------------------------------------------ */ SYSCALL kill(pid) int pid; /* process to kill */ { struct pentry *pptr; /* points to proc. table for pid*/ int dev; char ps; disable(ps); if (isbadpid(pid) || (pptr= &proctab[pid])->pstate==PRFREE) { restore(ps); return(SYSERR); } if (--numproc == 0) xdone(); dev = pptr->pdevs[0]; if (! isbaddev(dev) ) close(dev); dev = pptr->pdevs[1]; if (! isbaddev(dev) ) close(dev); send(pptr->pnxtkin, pid); freestk(pptr->pbase, pptr->pstklen); switch (pptr->pstate) { case PRCURR: pptr->pstate = PRFREE; /* suicide */ resched(); case PRWAIT: semaph[pptr->psem].semcnt++; /* fall through */ case PRREADY: dequeue(pid); pptr->pstate = PRFREE; break; case PRSLEEP: case PRTRECV: unsleep(pid); /* fall through */ default: pptr->pstate = PRFREE; } restore(ps); return(OK); }