delete VERBOSE #ifdef's

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

diff --git a/usr/src/sys/kern/kern_exit.c b/usr/src/sys/kern/kern_exit.c
index 8cf160b..db2e2d3 100644 (file)
--- a/usr/src/sys/kern/kern_exit.c
+++ b/usr/src/sys/kern/kern_exit.c
@@ -1,277 +1,444 @@
 /*
 /*

- * Copyright (c) 1982 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
+ * All rights reserved.

  *
  *

- *     @(#)kern_exit.c 6.11 (Berkeley) %G%
+ * %sccs.include.redist.c%
+ *
+ *     @(#)kern_exit.c 7.49 (Berkeley) %G%

  */
 
  */
 

-#include "../machine/reg.h"
-#include "../machine/psl.h"
-

 #include "param.h"
 #include "systm.h"
 #include "map.h"
 #include "param.h"
 #include "systm.h"
 #include "map.h"

-#include "dir.h"
-#include "user.h"
-#include "kernel.h"
+#include "ioctl.h"

 #include "proc.h"
 #include "proc.h"

+#include "tty.h"
+#include "time.h"
+#include "resource.h"
+#include "kernel.h"

 #include "buf.h"
 #include "wait.h"
 #include "buf.h"
 #include "wait.h"

-#include "vm.h"

 #include "file.h"
 #include "file.h"

-#include "mbuf.h"
-#include "inode.h"
+#include "vnode.h"

 #include "syslog.h"
 #include "syslog.h"

+#include "malloc.h"
+#include "resourcevar.h"
+#include "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
  */
 
 /*
  * Exit system call: pass back caller's arg
  */

-rexit()
+struct rexit_args {
+       int     rval;
+};
+/* ARGSUSED */
+rexit(p, uap, retval)
+       struct proc *p;
+       struct rexit_args *uap;
+       int *retval;

 {
 {

-       register struct a {
-               int     rval;
-       } *uap;

 
 

-       uap = (struct a *)u.u_ap;
-       exit((uap->rval & 0377) << 8);
+       exit(p, W_EXITCODE(uap->rval, 0));
+       /* NOTREACHED */

 }
 
 /*
 }
 
 /*

- * Release resources.
- * Save u. area for parent to look at.
- * Enter zombie state.
- * Wake up parent and init processes,
- * and dispose of children.
+ * 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.

  */
  */

-exit(rv)
+exit(p, rv)
+       register struct proc *p;

        int rv;
 {
        int rv;
 {

-       register int i;
-       register struct proc *p, *q, *nq;
-       register int x;
-       struct mbuf *m = m_getclr(M_WAIT, MT_ZOMBIE);
+       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
 #ifdef PGINPROF
        vmsizmon();
 #endif

-       p = u.u_procp;
-       p->p_flag &= ~(STRC|SULOCK);
+       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_flag |= SWEXIT;
        p->p_sigignore = ~0;

-       p->p_cpticks = 0;
-       p->p_pctcpu = 0;
-       for (i = 0; i < NSIG; i++)
-               u.u_signal[i] = SIG_IGN;
+       p->p_sig = 0;

        untimeout(realitexpire, (caddr_t)p);
        untimeout(realitexpire, (caddr_t)p);

+

        /*
        /*

-        * Release virtual memory.  If we resulted from
-        * a vfork(), instead give the resources back to
-        * the parent.
+        * Close open files and release open-file table.
+        * This may block!

         */
         */

-       if ((p->p_flag & SVFORK) == 0)
-               vrelvm();
-       else {
-               p->p_flag &= ~SVFORK;
-               wakeup((caddr_t)p);
-               while ((p->p_flag & SVFDONE) == 0)
-                       sleep((caddr_t)p, PZERO - 1);
-               p->p_flag &= ~SVFDONE;
-       }
-       for (i = 0; i <= u.u_lastfile; i++) {
-               struct file *f;
-
-               f = u.u_ofile[i];
-               if (f) {
-                       u.u_ofile[i] = NULL;
-                       u.u_pofile[i] = 0;
-                       closef(f);
+       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;

        }
        }

-       ilock(u.u_cdir);
-       iput(u.u_cdir);
-       if (u.u_rdir) {
-               ilock(u.u_rdir);
-               iput(u.u_rdir);
-       }
-       u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
-       acct();
-#ifdef QUOTA
-       qclean();
+       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
 #endif

-       vrelpt(u.u_procp);
-       vrelu(u.u_procp, 0);
-       (void) spl5();          /* hack for mem alloc race XXX */
-       if (*p->p_prev = p->p_nxt)              /* off allproc queue */
+       /*
+        * 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;
                p->p_nxt->p_prev = p->p_prev;

-       if (p->p_nxt = zombproc)                /* onto zombproc */
+       if (p->p_nxt = zombproc)

                p->p_nxt->p_prev = &p->p_nxt;
        p->p_prev = &zombproc;
        zombproc = p;
                p->p_nxt->p_prev = &p->p_nxt;
        p->p_prev = &zombproc;
        zombproc = p;

-       multprog--;

        p->p_stat = SZOMB;
        p->p_stat = SZOMB;

-       noproc = 1;
-       i = PIDHASH(p->p_pid);
-       x = p - proc;
-       if (pidhash[i] == x)
-               pidhash[i] = p->p_idhash;
-       else {
-               for (i = pidhash[i]; i != 0; i = proc[i].p_idhash)
-                       if (proc[i].p_idhash == x) {
-                               proc[i].p_idhash = p->p_idhash;
-                               goto done;
-                       }
-               panic("exit");
-       }
-       if (p->p_pid == 1) {
-               if (p->p_dsize == 0) {
-                       printf("Can't exec /etc/init\n");
-                       for (;;)
-                               ;
-               } else
-                       panic("init died");
-       }
+
+       for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash)
+               if (*pp == p) {
+                       *pp = p->p_hash;
+                       goto done;
+               }
+       panic("exit");

 done:
 done:

-       p->p_xstat = rv;
-       p->p_ru = mtod(m, struct rusage *);
-       *p->p_ru = u.u_ru;
-       ruadd(p->p_ru, &u.u_cru);
+

        if (p->p_cptr)          /* only need this if any child is S_ZOMB */
        if (p->p_cptr)          /* only need this if any child is S_ZOMB */

-               wakeup((caddr_t)&proc[1]);
+               wakeup((caddr_t) initproc);

        for (q = p->p_cptr; q != NULL; q = nq) {
                nq = q->p_osptr;
                if (nq != NULL)
                        nq->p_ysptr = NULL;
        for (q = p->p_cptr; q != NULL; q = nq) {
                nq = q->p_osptr;
                if (nq != NULL)
                        nq->p_ysptr = NULL;

-               if (proc[1].p_cptr)
-                       proc[1].p_cptr->p_ysptr = q;
-               q->p_osptr = proc[1].p_cptr;
+               if (initproc->p_cptr)
+                       initproc->p_cptr->p_ysptr = q;
+               q->p_osptr = initproc->p_cptr;

                q->p_ysptr = NULL;
                q->p_ysptr = NULL;

-               proc[1].p_cptr = q;
+               initproc->p_cptr = q;

 
 

-               q->p_pptr = &proc[1];
-               q->p_ppid = 1;
+               q->p_pptr = initproc;

                /*
                 * Traced processes are killed
                 * since their existence means someone is screwing up.
                /*
                 * Traced processes are killed
                 * since their existence means someone is screwing up.

-                * Stopped processes are sent a hangup and a continue.
-                * This is designed to be ``safe'' for setuid
-                * processes since they must be willing to tolerate
-                * hangups anyways.

                 */
                if (q->p_flag&STRC) {
                        q->p_flag &= ~STRC;
                        psignal(q, SIGKILL);
                 */
                if (q->p_flag&STRC) {
                        q->p_flag &= ~STRC;
                        psignal(q, SIGKILL);

-               } else if (q->p_stat == SSTOP) {
-                       psignal(q, SIGHUP);
-                       psignal(q, SIGCONT);

                }
                }

-               /*
-                * Protect this process from future
-                * tty signals, clear TSTP/TTIN/TTOU if pending.
-                */
-               (void) spgrp(q);

        }
        p->p_cptr = NULL;
        }
        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);
        psignal(p->p_pptr, SIGCHLD);
        wakeup((caddr_t)p->p_pptr);

-       swtch();
+#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 */

 }
 
 }
 

-wait()
+struct wait_args {
+       int     pid;
+       int     *status;
+       int     options;
+       struct  rusage *rusage;
+#ifdef COMPAT_43
+       int     compat;         /* pseudo */
+#endif
+};
+
+#ifdef COMPAT_43
+owait(p, uap, retval)
+       struct proc *p;
+       register struct wait_args *uap;
+       int *retval;

 {
 {

-       struct rusage ru, *rup;

 
 

-       if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
-               u.u_error = wait1(0, (struct rusage *)0);
-               return;
+#ifdef PSL_ALLCC
+       if ((p->p_md.md_regs[PS] & 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];

        }
        }

-       rup = (struct rusage *)u.u_ar0[R1];
-       u.u_error = wait1(u.u_ar0[R0], &ru);
-       if (u.u_error)
-               return;
-       if (rup != (struct rusage *)0)
-               u.u_error = copyout((caddr_t)&ru, (caddr_t)rup,
-                   sizeof (struct rusage));
+#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 system call.
- * Search for a terminated (zombie) child,
- * finally lay it to rest, and collect its status.
- * Look also for stopped (traced) children,
- * and pass back status from them.
+ * 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(options, ru)
-       register int options;
-       struct rusage *ru;
+wait1(q, uap, retval)
+       register struct proc *q;
+       register struct wait_args *uap;
+       int retval[];

 {
 {

-       register f;
-       register struct proc *p, *q;
+       register int nfound;
+       register struct proc *p, *t;
+       int status, error;

 
 

-       f = 0;
+       if (uap->pid == 0)
+               uap->pid = -q->p_pgid;
+#ifdef notyet
+       if (uap->options &~ (WUNTRACED|WNOHANG))
+               return (EINVAL);
+#endif

 loop:
 loop:

-       q = u.u_procp;
+       nfound = 0;

        for (p = q->p_cptr; p; p = p->p_osptr) {
        for (p = q->p_cptr; p; p = p->p_osptr) {

-               f++;
+               if (uap->pid != WAIT_ANY &&
+                   p->p_pid != uap->pid && p->p_pgid != -uap->pid)
+                       continue;
+               nfound++;

                if (p->p_stat == SZOMB) {
                if (p->p_stat == SZOMB) {

-                       u.u_r.r_val1 = p->p_pid;
-                       u.u_r.r_val2 = p->p_xstat;
+                       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;
                        p->p_xstat = 0;

-                       if (ru && p->p_ru)
-                               *ru = *p->p_ru;
-                       if (p->p_ru) {
-                               ruadd(&u.u_cru, p->p_ru);
-                               (void) m_free(dtom(p->p_ru));
-                               p->p_ru = 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);

                        }
                        }

-                       p->p_stat = NULL;
-                       p->p_pid = 0;
-                       p->p_ppid = 0;
+
+                       /*
+                        * 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 (*p->p_prev = p->p_nxt)      /* off zombproc */
                                p->p_nxt->p_prev = p->p_prev;

-                       p->p_nxt = freeproc;            /* onto freeproc */
-                       freeproc = p;

                        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;
                        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;

-                       p->p_pptr = 0;
-                       p->p_ysptr = 0;
-                       p->p_osptr = 0;
-                       p->p_cptr = 0;
-                       p->p_sig = 0;
-                       p->p_sigcatch = 0;
-                       p->p_sigignore = 0;
-                       p->p_sigmask = 0;
-                       p->p_pgrp = 0;
-                       p->p_flag = 0;
-                       p->p_wchan = 0;
-                       p->p_cursig = 0;
+
+                       /*
+                        * 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);
                }
                        return (0);
                }

-               if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 &&
-                   (p->p_flag&STRC || options&WUNTRACED)) {
+               if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
+                   (p->p_flag & STRC || uap->options & WUNTRACED)) {

                        p->p_flag |= SWTED;
                        p->p_flag |= SWTED;

-                       u.u_r.r_val1 = p->p_pid;
-                       u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED;
-                       return (0);
+                       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 (f == 0)
+       if (nfound == 0)

                return (ECHILD);
                return (ECHILD);

-       if (options&WNOHANG) {
-               u.u_r.r_val1 = 0;
-               return (0);
-       }
-       if (setjmp(&u.u_qsave)) {
-               p = u.u_procp;
-               if ((u.u_sigintr & sigmask(p->p_cursig)) != 0)
-                       return(EINTR);
-               u.u_eosys = RESTARTSYS;
+       if (uap->options & WNOHANG) {
+               retval[0] = 0;

                return (0);
        }
                return (0);
        }

-       sleep((caddr_t)u.u_procp, PWAIT);
+       if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0))
+               return (error);

        goto loop;
 }
        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;
+}