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PERFORCE change 134443 for review

Subject: PERFORCE change 134443 for review
From: John Birrell
Date: Wed, 30 Jan 2008 05:39:35 GMT
http://perforce.freebsd.org/chv.cgi?CH=134443

Change 134443 by jb@jb_freebsd1 on 2008/01/30 05:39:22

        IFdtrace

Affected files ...

.. //depot/projects/dtrace7/src/sys/kern/kern_exit.c#2 edit

Differences ...

==== //depot/projects/dtrace7/src/sys/kern/kern_exit.c#2 (text+ko) ====

@@ -38,6 +38,7 @@
 __FBSDID("$FreeBSD: src/sys/kern/kern_exit.c,v 1.304 2007/06/13 20:01:42 jhb 
Exp $");
 
 #include "opt_compat.h"
+#include "opt_kdtrace.h"
 #include "opt_ktrace.h"
 #include "opt_mac.h"
 
@@ -65,6 +66,7 @@
 #include <sys/ptrace.h>
 #include <sys/acct.h>          /* for acct_process() function prototype */
 #include <sys/filedesc.h>
+#include <sys/sdt.h>
 #include <sys/shm.h>
 #include <sys/sem.h>
 #ifdef KTRACE
@@ -82,6 +84,15 @@
 #include <vm/vm_page.h>
 #include <vm/uma.h>
 
+#ifdef KDTRACE_HOOKS
+#include <sys/dtrace_bsd.h>
+dtrace_execexit_func_t dtrace_fasttrap_exit;
+#endif
+
+SDT_PROVIDER_DECLARE(proc);
+SDT_PROBE_DEFINE(proc, kernel, , exit);
+SDT_PROBE_ARGTYPE(proc, kernel, , exit, 0, "int");
+
 /* Required to be non-static for SysVR4 emulator */
 MALLOC_DEFINE(M_ZOMBIE, "zombie", "zombie proc status");
 
@@ -449,11 +460,29 @@
        PROC_LOCK(p);
        p->p_xstat = rv;
        p->p_xthread = td;
+
+#ifdef KDTRACE_HOOKS
        /*
+        * Tell the DTrace fasttrap provider about the exit if it
+        * has declared an interest.
+        */
+       if (dtrace_fasttrap_exit)
+               dtrace_fasttrap_exit(p);
+#endif
+
+       /*
         * Notify interested parties of our demise.
         */
        KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);
 
+#ifdef KDTRACE_HOOKS
+       int reason = CLD_EXITED;
+       if (WCOREDUMP(rv))
+               reason = CLD_DUMPED;
+       else if (WIFSIGNALED(rv))
+               reason = CLD_KILLED;
+       SDT_PROBE(proc, kernel, , exit, reason, 0, 0, 0, 0);
+#endif
        /*
         * Just delete all entries in the p_klist. At this point we won't
         * report any more events, and there are nasty race conditions that
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