[hurd] 36/70: hurd: add proc_mark_important

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 5f536bc5ae7948555af12b105a97aa887fe5da48
Author: Justus Winter <address@hidden>
Date:   Thu Aug 15 09:37:57 2013 +0200

    hurd: add proc_mark_important
    
    This is based on a fragment of Guillem Jovers patch presented here:
    
    http://lists.gnu.org/archive/html/bug-hurd/2006-02/msg00081.html
    
    It has been refreshed, updated and the copyright year is adjusted
    properly. It has been complemented with the necessary features to
    address the issues the original patch set out to address, namely
    that killall5 freezes the proc translator before it tries to walk
    over /proc/*/stat to decide which process to kill. Prior to this
    patch (and the one marking the procfs server as important
    process), killall5 would deadlock trying to walk over the proc
    file system.
    
    Ironically it would not have killed any process later on even if
    it had the chance, since two values obtained from /proc/*/stat
    are currently hardcoded to zero in our procfs. Patches addressing
    the problem as a whole are prepared and will be sent as a follow
    up.
    
    * hurd/process.defs (proc_mark_important): New routine definitions.
    * hurd/process_reply.defs (proc_mark_important_request): Likewise.
    * hurd/process_request.defs (proc_mark_important_request): Likewise.
---
 hurd/process.defs         |   11 ++++++++++-
 hurd/process_reply.defs   |    9 ++++++++-
 hurd/process_request.defs |   12 +++++++++++-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/hurd/process.defs b/hurd/process.defs
index c74031a..b7e1775 100644
--- a/hurd/process.defs
+++ b/hurd/process.defs
@@ -1,5 +1,5 @@
 /* Definitions for process server interface
-   Copyright (C) 1992,93,94,95,96,97,2001 Free Software Foundation
+   Copyright (C) 1992,93,94,95,96,97,2001,2013 Free Software Foundation
 
 This file is part of the GNU Hurd.
 
@@ -374,3 +374,12 @@ routine proc_getnports (
 /*** Routines related to early server bootstrapping ***/
 
 skip;  /* Reserved for proc_set_init_task */
+
+/* Inform the process server that the process is important.  */
+routine proc_mark_important (
+       process: process_t);
+
+/* Query whether the process is important.  */
+routine proc_is_important (
+       process: process_t;
+       out essential: boolean_t);
diff --git a/hurd/process_reply.defs b/hurd/process_reply.defs
index bea0064..38f2082 100644
--- a/hurd/process_reply.defs
+++ b/hurd/process_reply.defs
@@ -1,5 +1,5 @@
 /* Reply half of wait
-   Copyright (C) 1991,93,94,96,2001 Free Software Foundation, Inc.
+   Copyright (C) 1991,93,94,96,2001,13 Free Software Foundation, Inc.
 
 This file is part of the GNU Hurd.
 
@@ -178,3 +178,10 @@ simpleroutine proc_getnports (
 /*** Routines related to early server bootstrapping ***/
 
 skip;  /* Reserved for proc_set_init_task */
+skip; /* proc_mark_important */
+
+simpleroutine proc_is_important (
+       reply_port: reply_port_t;
+       RETURN_CODE_ARG;
+       essential: boolean_t);
+
diff --git a/hurd/process_request.defs b/hurd/process_request.defs
index e36b367..3ef7353 100644
--- a/hurd/process_request.defs
+++ b/hurd/process_request.defs
@@ -1,6 +1,6 @@
 /* Definitions for process server interface (request-only version)
 
-   Copyright (C) 1992, 93, 94, 95, 96, 98 Free Software Foundation, Inc.
+   Copyright (C) 1992, 93, 94, 95, 96, 98, 2013 Free Software Foundation, Inc.
 
 This file is part of the GNU Hurd.
 
@@ -375,3 +375,13 @@ simpleroutine proc_getnports_request (
 /*** Routines related to early server bootstrapping ***/
 
 skip;  /* Reserved for proc_set_init_task */
+
+/* Inform the process server that the process is important.  */
+simpleroutine proc_mark_important_request (
+       process: process_t;
+       ureplyport reply: reply_port_t);
+
+/* Query whether the process is important.  */
+simpleroutine proc_is_important_request (
+       process: process_t;
+       ureplyport reply: reply_port_t);

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