BSD 4_3_Net_2 release

[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 2b1e706..ced7a4e 100644 (file)
--- a/usr/src/sys/kern/kern_exit.c
+++ b/usr/src/sys/kern/kern_exit.c
@@ -1,23 +1,36 @@
 /*
 /*

- * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.

  * All rights reserved.
  *
  * All rights reserved.
  *

- * Redistribution is only permitted until one year after the first shipment
- * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
- * binary forms are permitted provided that: (1) source distributions retain
- * this entire copyright notice and comment, and (2) distributions including
- * binaries display the following acknowledgement:  This product includes
- * software developed by the University of California, Berkeley and its
- * contributors'' in the documentation or other materials provided with the
- * distribution and in all advertising materials mentioning features or use
- * of this software.  Neither the name of the University nor the names of
- * its contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.

  *
  *

- *     @(#)kern_exit.c 7.26 (Berkeley) 6/28/90
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *     @(#)kern_exit.c 7.35 (Berkeley) 6/27/91

  */
 
 #include "param.h"
  */
 
 #include "param.h"


@@ -25,22 +38,27 @@
 #include "map.h"
 #include "ioctl.h"
 #include "tty.h"
 #include "map.h"
 #include "ioctl.h"
 #include "tty.h"

-#include "user.h"
+#include "time.h"
+#include "resource.h"

 #include "kernel.h"
 #include "proc.h"
 #include "buf.h"
 #include "wait.h"
 #include "kernel.h"
 #include "proc.h"
 #include "buf.h"
 #include "wait.h"

-#include "vm.h"

 #include "file.h"
 #include "vnode.h"
 #include "syslog.h"
 #include "malloc.h"
 #include "file.h"
 #include "vnode.h"
 #include "syslog.h"
 #include "malloc.h"

+#include "resourcevar.h"

 
 

-#include "machine/reg.h"
+#include "machine/cpu.h"

 #ifdef COMPAT_43
 #ifdef COMPAT_43

+#include "machine/reg.h"

 #include "machine/psl.h"
 #endif
 
 #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
  */


@@ -53,78 +71,80 @@ rexit(p, uap, retval)
        int *retval;
 {
 
        int *retval;
 {
 

-       return (exit(p, W_EXITCODE(uap->rval, 0)));
+       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(p, rv)
  */
 exit(p, rv)

-       struct proc *p;
+       register struct proc *p;

        int rv;
 {
        int rv;
 {

-       register int i;

        register struct proc *q, *nq;
        register struct proc **pp;
        register struct proc *q, *nq;
        register struct proc **pp;

+       int s;

 
 #ifdef PGINPROF
        vmsizmon();
 #endif
        MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
                M_ZOMBIE, M_WAITOK);
 
 #ifdef PGINPROF
        vmsizmon();
 #endif
        MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
                M_ZOMBIE, M_WAITOK);

-       p->p_flag &= ~(STRC|SULOCK);
+       /*
+        * 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;
        p->p_flag |= SWEXIT;
        p->p_sigignore = ~0;
        p->p_sig = 0;

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

        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) {
-#ifdef MAPMEM
-               if (u.u_mmap)
-                       (void) mmexit(p);
+       fdfree(p);
+
+       /* The next two chunks should probably be moved to vmspace_exit. */
+#ifdef SYSVSHM
+       if (p->p_vmspace->vm_shm)
+               shmexit(p);

 #endif
 #endif

-               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;
+       /*
+        * 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 (p->p_vmspace->vm_refcnt == 1)
+               (void) vm_map_remove(&p->p_vmspace->vm_map, VM_MIN_ADDRESS,
+                   VM_MAXUSER_ADDRESS);

 
 

-               f = u.u_ofile[i];
-               if (f) {
-                       u.u_ofile[i] = NULL;
-                       u.u_pofile[i] = 0;
-                       (void) closef(f);
-               }
-       }
+       if (p->p_pid == 1)
+               panic("init died");

        if (SESS_LEADER(p)) {
                register struct session *sp = p->p_session;
 
                if (sp->s_ttyvp) {
                        /*
                         * Controlling process.
        if (SESS_LEADER(p)) {
                register struct session *sp = p->p_session;
 
                if (sp->s_ttyvp) {
                        /*
                         * Controlling process.

-                        * Signal foreground pgrp and revoke access
-                        * to controlling terminal.
+                        * Signal foreground pgrp,
+                        * drain controlling terminal
+                        * and revoke access to controlling terminal.

                         */
                         */

-                       if (sp->s_ttyp->t_pgrp)
-                               pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
-                       vgoneall(sp->s_ttyvp);
+                       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;
                        /*
                        vrele(sp->s_ttyvp);
                        sp->s_ttyvp = NULL;
                        /*


@@ -133,17 +153,13 @@ exit(p, rv)
                         * (for logging and informational purposes)
                         */
                }
                         * (for logging and informational purposes)
                         */
                }

-               sp->s_leader = 0;
-       }
-       VOP_LOCK(u.u_cdir);
-       vput(u.u_cdir);
-       if (u.u_rdir) {
-               VOP_LOCK(u.u_rdir);
-               vput(u.u_rdir);
+               sp->s_leader = NULL;

        }
        }

-       u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
+       fixjobc(p, p->p_pgrp, 0);
+       p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;

        (void) acct(p);
        (void) acct(p);

-       crfree(u.u_cred);
+       if (--p->p_limit->p_refcnt == 0)
+               FREE(p->p_limit, M_SUBPROC);

 #ifdef KTRACE
        /* 
         * release trace file
 #ifdef KTRACE
        /* 
         * release trace file


@@ -151,23 +167,19 @@ exit(p, rv)
        if (p->p_tracep)
                vrele(p->p_tracep);
 #endif
        if (p->p_tracep)
                vrele(p->p_tracep);
 #endif

+

        /*
        /*

-        * Freeing the user structure and kernel stack
-        * for the current process: have to run a bit longer
-        * using the pages which are about to be freed...
-        * vrelu will block memory allocation by raising ipl.
+        * Remove proc from allproc queue and pidhash chain.
+        * Place onto zombproc.  Unlink from parent's child list.

         */
         */

-       vrelu(p, 0);
-       vrelpt(p);
-       if (*p->p_prev = p->p_nxt)              /* off allproc queue */
+       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;
+       curproc = NULL;

        for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash)
                if (*pp == p) {
                        *pp = p->p_hash;
        for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash)
                if (*pp == p) {
                        *pp = p->p_hash;


@@ -175,36 +187,20 @@ exit(p, rv)
                }
        panic("exit");
 done:
                }
        panic("exit");
 done:

-       if (p->p_pid == 1) {
-               if (p->p_dsize == 0) {
-                       printf("Can't exec init (errno %d)\n", WEXITSTATUS(rv));
-                       for (;;)
-                               ;
-               } else
-                       panic("init died");
-       }
-       p->p_xstat = rv;
-       *p->p_ru = u.u_ru;
-       i = splclock();
-       p->p_ru->ru_stime = p->p_stime;
-       p->p_ru->ru_utime = p->p_utime;
-       splx(i);
-       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]);
-       fixjobc(p, 0);
+               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.


@@ -215,14 +211,37 @@ done:
                }
        }
        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;
+       p->p_ru->ru_stime = p->p_stime;
+       p->p_ru->ru_utime = p->p_utime;
+       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)
        psignal(p->p_pptr, SIGCHLD);
        wakeup((caddr_t)p->p_pptr);
 #if defined(tahoe)

-       dkeyrelease(p->p_dkey), p->p_dkey = 0;
-       ckeyrelease(p->p_ckey), p->p_ckey = 0;
-       u.u_pcb.pcb_savacc.faddr = (float *)NULL;
+       /* move this to cpu_exit */
+       p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL;

 #endif
 #endif

-       swtch();
+       /*
+        * 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 swtch(), finishing
+        * our execution (pun intended).
+        */
+       cpu_exit(p);
+       /* NOTREACHED */

 }
 
 #ifdef COMPAT_43
 }
 
 #ifdef COMPAT_43


@@ -238,12 +257,12 @@ owait(p, uap, retval)
        int *retval;
 {
 
        int *retval;
 {
 

-       if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
+       if ((p->p_regs[PS] & PSL_ALLCC) != PSL_ALLCC) {

                uap->options = 0;
                uap->rusage = 0;
        } else {
                uap->options = 0;
                uap->rusage = 0;
        } else {

-               uap->options = u.u_ar0[R0];
-               uap->rusage = (struct rusage *)u.u_ar0[R1];
+               uap->options = p->p_regs[R0];
+               uap->rusage = (struct rusage *)p->p_regs[R1];

        }
        uap->pid = WAIT_ANY;
        uap->status = 0;
        }
        uap->pid = WAIT_ANY;
        uap->status = 0;


@@ -271,11 +290,9 @@ wait4(p, uap, retval)
 #endif
 
 /*
 #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(q, uap, retval)
        register struct proc *q;
  */
 wait1(q, uap, retval)
        register struct proc *q;


@@ -290,7 +307,7 @@ wait1(q, uap, retval)
        } *uap;
        int retval[];
 {
        } *uap;
        int retval[];
 {

-       register int f;
+       register int nfound;

        register struct proc *p;
        int status, error;
 
        register struct proc *p;
        int status, error;
 


@@ -301,12 +318,12 @@ wait1(q, uap, retval)
                return (EINVAL);
 #endif
 loop:
                return (EINVAL);
 #endif
 loop:

-       f = 0;
+       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;
        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;

-               f++;
+               nfound++;

                if (p->p_stat == SZOMB) {
                        retval[0] = p->p_pid;
 #ifdef COMPAT_43
                if (p->p_stat == SZOMB) {
                        retval[0] = p->p_pid;
 #ifdef COMPAT_43


@@ -323,35 +340,36 @@ loop:
                        if (uap->rusage && (error = copyout((caddr_t)p->p_ru,
                            (caddr_t)uap->rusage, sizeof (struct rusage))))
                                return (error);
                        if (uap->rusage && (error = copyout((caddr_t)p->p_ru,
                            (caddr_t)uap->rusage, sizeof (struct rusage))))
                                return (error);

-                       pgrm(p);                        /* off pgrp */

                        p->p_xstat = 0;
                        p->p_xstat = 0;

-                       ruadd(&u.u_cru, p->p_ru);
+                       ruadd(&q->p_stats->p_cru, p->p_ru);

                        FREE(p->p_ru, M_ZOMBIE);
                        FREE(p->p_ru, M_ZOMBIE);

-                       p->p_ru = 0;
-                       p->p_stat = NULL;
-                       p->p_pid = 0;
-                       p->p_ppid = 0;
+                       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 (*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;
+
+                       /*
+                        * 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 &&
                        return (0);
                }
                if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&


@@ -373,7 +391,7 @@ loop:
                        return (error);
                }
        }
                        return (error);
                }
        }

-       if (f == 0)
+       if (nfound == 0)

                return (ECHILD);
        if (uap->options & WNOHANG) {
                retval[0] = 0;
                return (ECHILD);
        if (uap->options & WNOHANG) {
                retval[0] = 0;