do not return from sigsuspend prematurely

[unix-history] / usr / src / sys / kern / kern_exit.c

/*
 * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)kern_exit.c	7.52 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/map.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/wait.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/resourcevar.h>
#include <sys/ptrace.h>

#include <machine/cpu.h>
#ifdef COMPAT_43
#include <machine/reg.h>
#include <machine/psl.h>
#endif

#include <vm/vm.h>
#include <vm/vm_kern.h>

/*
 * Exit system call: pass back caller's arg
 */
struct rexit_args {
	int	rval;
};
/* ARGSUSED */
rexit(p, uap, retval)
	struct proc *p;
	struct rexit_args *uap;
	int *retval;
{

	exit1(p, W_EXITCODE(uap->rval, 0));
	/* NOTREACHED */
}

/*
 * Exit: deallocate address space and other resources,
 * change proc state to zombie, and unlink proc from allproc
 * and parent's lists.  Save exit status and rusage for wait().
 * Check for child processes and orphan them.
 */
exit1(p, rv)
	register struct proc *p;
	int rv;
{
	register struct proc *q, *nq;
	register struct proc **pp;
	register struct vmspace *vm;
	int s;

	if (p->p_pid == 1)
		panic("init died (signal %d, exit %d)",
		    WTERMSIG(rv), WEXITSTATUS(rv));
#ifdef PGINPROF
	vmsizmon();
#endif
	if (p->p_flag & SPROFIL)
		stopprofclock(p);
	MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
		M_ZOMBIE, M_WAITOK);
	/*
	 * If parent is waiting for us to exit or exec,
	 * SPPWAIT is set; we will wakeup the parent below.
	 */
	p->p_flag &= ~(STRC|SPPWAIT);
	p->p_flag |= SWEXIT;
	p->p_sigignore = ~0;
	p->p_sig = 0;
	untimeout(realitexpire, (caddr_t)p);

	/*
	 * Close open files and release open-file table.
	 * This may block!
	 */
	fdfree(p);

	/* The next two chunks should probably be moved to vmspace_exit. */
	vm = p->p_vmspace;
#ifdef SYSVSHM
	if (vm->vm_shm)
		shmexit(p);
#endif
	/*
	 * Release user portion of address space.
	 * This releases references to vnodes,
	 * which could cause I/O if the file has been unlinked.
	 * Need to do this early enough that we can still sleep.
	 * Can't free the entire vmspace as the kernel stack
	 * may be mapped within that space also.
	 */
	if (vm->vm_refcnt == 1)
		(void) vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS,
		    VM_MAXUSER_ADDRESS);

	if (SESS_LEADER(p)) {
		register struct session *sp = p->p_session;

		if (sp->s_ttyvp) {
			/*
			 * Controlling process.
			 * Signal foreground pgrp,
			 * drain controlling terminal
			 * and revoke access to controlling terminal.
			 */
			if (sp->s_ttyp->t_session == sp) {
				if (sp->s_ttyp->t_pgrp)
					pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
				(void) ttywait(sp->s_ttyp);
				vgoneall(sp->s_ttyvp);
			}
			vrele(sp->s_ttyvp);
			sp->s_ttyvp = NULL;
			/*
			 * s_ttyp is not zero'd; we use this to indicate
			 * that the session once had a controlling terminal.
			 * (for logging and informational purposes)
			 */
		}
		sp->s_leader = NULL;
	}
	fixjobc(p, p->p_pgrp, 0);
	p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
	(void) acct(p);
#ifdef KTRACE
	/* 
	 * release trace file
	 */
	p->p_traceflag = 0;	/* don't trace the vrele() */
	if (p->p_tracep)
		vrele(p->p_tracep);
#endif
	/*
	 * Remove proc from allproc queue and pidhash chain.
	 * Place onto zombproc.  Unlink from parent's child list.
	 */
	if (*p->p_prev = p->p_nxt)
		p->p_nxt->p_prev = p->p_prev;
	if (p->p_nxt = zombproc)
		p->p_nxt->p_prev = &p->p_nxt;
	p->p_prev = &zombproc;
	zombproc = p;
	p->p_stat = SZOMB;

	for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash)
		if (*pp == p) {
			*pp = p->p_hash;
			goto done;
		}
	panic("exit");
done:

	if (p->p_cptr)		/* only need this if any child is S_ZOMB */
		wakeup((caddr_t) initproc);
	for (q = p->p_cptr; q != NULL; q = nq) {
		nq = q->p_osptr;
		if (nq != NULL)
			nq->p_ysptr = NULL;
		if (initproc->p_cptr)
			initproc->p_cptr->p_ysptr = q;
		q->p_osptr = initproc->p_cptr;
		q->p_ysptr = NULL;
		initproc->p_cptr = q;

		q->p_pptr = initproc;
		/*
		 * Traced processes are killed
		 * since their existence means someone is screwing up.
		 */
		if (q->p_flag&STRC) {
			q->p_flag &= ~STRC;
			psignal(q, SIGKILL);
		}
	}
	p->p_cptr = NULL;

	/*
	 * Save exit status and final rusage info, adding in child rusage
	 * info and self times.
	 */
	p->p_xstat = rv;
	*p->p_ru = p->p_stats->p_ru;
	calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL);
	ruadd(p->p_ru, &p->p_stats->p_cru);

	/*
	 * Notify parent that we're gone.
	 */
	psignal(p->p_pptr, SIGCHLD);
	wakeup((caddr_t)p->p_pptr);
#if defined(tahoe)
	/* move this to cpu_exit */
	p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL;
#endif
	/*
	 * Clear curproc after we've done all operations
	 * that could block, and before tearing down the rest
	 * of the process state that might be used from clock, etc.
	 * Also, can't clear curproc while we're still runnable,
	 * as we're not on a run queue (we are current, just not
	 * a proper proc any longer!).
	 *
	 * Other substructures are freed from wait().
	 */
	curproc = NULL;
	if (--p->p_limit->p_refcnt == 0)
		FREE(p->p_limit, M_SUBPROC);

	/*
	 * Finally, call machine-dependent code to release the remaining
	 * resources including address space, the kernel stack and pcb.
	 * The address space is released by "vmspace_free(p->p_vmspace)";
	 * This is machine-dependent, as we may have to change stacks
	 * or ensure that the current one isn't reallocated before we
	 * finish.  cpu_exit will end with a call to cpu_swtch(), finishing
	 * our execution (pun intended).
	 */
	cpu_exit(p);
	/* NOTREACHED */
}

struct wait_args {
	int	pid;
	int	*status;
	int	options;
	struct	rusage *rusage;
#ifdef COMPAT_43
	int	compat;		/* pseudo */
#endif
};

#ifdef COMPAT_43
#ifdef hp300
#include <machine/frame.h>
#define GETPS(rp)	((struct frame *)(rp))->f_sr
#else
#define GETPS(rp)	(rp)[PS]
#endif

owait(p, uap, retval)
	struct proc *p;
	register struct wait_args *uap;
	int *retval;
{

#ifdef PSL_ALLCC
	if ((GETPS(p->p_md.md_regs) & PSL_ALLCC) != PSL_ALLCC) {
		uap->options = 0;
		uap->rusage = NULL;
	} else {
		uap->options = p->p_md.md_regs[R0];
		uap->rusage = (struct rusage *)p->p_md.md_regs[R1];
	}
#else
	uap->options = 0;
	uap->rusage = NULL;
#endif
	uap->pid = WAIT_ANY;
	uap->status = NULL;
	uap->compat = 1;
	return (wait1(p, uap, retval));
}

wait4(p, uap, retval)
	struct proc *p;
	struct wait_args *uap;
	int *retval;
{

	uap->compat = 0;
	return (wait1(p, uap, retval));
}
#else
#define	wait1	wait4
#endif

/*
 * Wait: check child processes to see if any have exited,
 * stopped under trace, or (optionally) stopped by a signal.
 * Pass back status and deallocate exited child's proc structure.
 */
wait1(q, uap, retval)
	register struct proc *q;
	register struct wait_args *uap;
	int retval[];
{
	register int nfound;
	register struct proc *p, *t;
	int status, error;

	if (uap->pid == 0)
		uap->pid = -q->p_pgid;
#ifdef notyet
	if (uap->options &~ (WUNTRACED|WNOHANG))
		return (EINVAL);
#endif
loop:
	nfound = 0;
	for (p = q->p_cptr; p; p = p->p_osptr) {
		if (uap->pid != WAIT_ANY &&
		    p->p_pid != uap->pid && p->p_pgid != -uap->pid)
			continue;
		nfound++;
		if (p->p_stat == SZOMB) {
			retval[0] = p->p_pid;
#ifdef COMPAT_43
			if (uap->compat)
				retval[1] = p->p_xstat;
			else
#endif
			if (uap->status) {
				status = p->p_xstat;	/* convert to int */
				if (error = copyout((caddr_t)&status,
				    (caddr_t)uap->status, sizeof(status)))
					return (error);
			}
			if (uap->rusage && (error = copyout((caddr_t)p->p_ru,
			    (caddr_t)uap->rusage, sizeof (struct rusage))))
				return (error);
			/*
			 * If we got the child via a ptrace 'attach',
			 * we need to give it back to the old parent.
			 */
			if (p->p_oppid && (t = pfind(p->p_oppid))) {
				p->p_oppid = 0;
				proc_reparent(p, t);
				psignal(t, SIGCHLD);
				wakeup((caddr_t)t);
				return (0);
			}
			p->p_xstat = 0;
			ruadd(&q->p_stats->p_cru, p->p_ru);
			FREE(p->p_ru, M_ZOMBIE);

			/*
			 * Decrement the count of procs running with this uid.
			 */
			(void)chgproccnt(p->p_cred->p_ruid, -1);

			/*
			 * Free up credentials.
			 */
			if (--p->p_cred->p_refcnt == 0) {
				crfree(p->p_cred->pc_ucred);
				FREE(p->p_cred, M_SUBPROC);
			}

			/*
			 * Finally finished with old proc entry.
			 * Unlink it from its process group and free it.
			 */
			leavepgrp(p);
			if (*p->p_prev = p->p_nxt)	/* off zombproc */
				p->p_nxt->p_prev = p->p_prev;
			if (q = p->p_ysptr)
				q->p_osptr = p->p_osptr;
			if (q = p->p_osptr)
				q->p_ysptr = p->p_ysptr;
			if ((q = p->p_pptr)->p_cptr == p)
				q->p_cptr = p->p_osptr;

			/*
			 * Give machine-dependent layer a chance
			 * to free anything that cpu_exit couldn't
			 * release while still running in process context.
			 */
			cpu_wait(p);
			FREE(p, M_PROC);
			nprocs--;
			return (0);
		}
		if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
		    (p->p_flag & STRC || uap->options & WUNTRACED)) {
			p->p_flag |= SWTED;
			retval[0] = p->p_pid;
#ifdef COMPAT_43
			if (uap->compat) {
				retval[1] = W_STOPCODE(p->p_xstat);
				error = 0;
			} else
#endif
			if (uap->status) {
				status = W_STOPCODE(p->p_xstat);
				error = copyout((caddr_t)&status,
					(caddr_t)uap->status, sizeof(status));
			} else
				error = 0;
			return (error);
		}
	}
	if (nfound == 0)
		return (ECHILD);
	if (uap->options & WNOHANG) {
		retval[0] = 0;
		return (0);
	}
	if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0))
		return (error);
	goto loop;
}

/*
 * make process 'parent' the new parent of process 'child'.
 */
void
proc_reparent(child, parent)
	register struct proc *child;
	register struct proc *parent;
{
	register struct proc *o;
	register struct proc *y;

	if (child->p_pptr == parent)
		return;

	/* fix up the child linkage for the old parent */
	o = child->p_osptr;
	y = child->p_ysptr;
	if (y)
		y->p_osptr = o;
	if (o)
		o->p_ysptr = y;
	if (child->p_pptr->p_cptr == child)
		child->p_pptr->p_cptr = o;

	/* fix up child linkage for new parent */
	o = parent->p_cptr;
	if (o)
		o->p_ysptr = child;
	child->p_osptr = o;
	child->p_ysptr = NULL;
	parent->p_cptr = child;
	child->p_pptr = parent;
}