From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 20 Aug 2022 15:21:38 +0000 (+0100)
Subject: prefork-interp: diagrams
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;ds=sidebyside;h=40e59f1526d31f3a2ef89bf8b6f8710773e3097b;p=chiark-utils.git

prefork-interp: diagrams

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/cprogs/prefork-interp.c b/cprogs/prefork-interp.c
index 2e7f42e..fb45ca0 100644
--- a/cprogs/prefork-interp.c
+++ b/cprogs/prefork-interp.c
@@ -19,14 +19,6 @@
 
   State during service execution, process parentage and key fds
 
-    ----      pipes, sockets
-    012       descriptors
-    -==-      fds shared
-    ||        process parentage
-    &&        session leader (daemon)
-    &         process group leader
-
-
       CALLER
         ||
         ||
@@ -49,21 +41,17 @@
                                           \ \ 2  ||  |
                                            \ 1 EXECUTOR
                                             0
+    ----      pipes, sockets
+    012       descriptors
+    -==-      fds shared
+    ||        process parentage
+    &&        session leader (daemon)
+    &         process group leader
 
 ***************************************************************************
 
  Control flow and causality
 
-    | - \ /    process control flow
-    ... < >    causes mediated by fds or other IPC etc.
-    &&         session leader (daemon)
-    &          process group leader
-    #          language/implementation boundary
-    *1         line continued elsewhere
-    event?     condition
-    ______     process termination (after reaping, if shown)
-
-
       CALLER
          |
          |fork/exec
@@ -161,6 +149,15 @@
                    #   send exit status  #
                    #  _____SIGPIPE______ #
 
+    | - \ /    process control flow
+    ... < >    causes mediated by fds or other IPC etc.
+    &&         session leader (daemon)
+    &          process group leader
+    #          language/implementation boundary
+    *1         line continued elsewhere
+    event?     condition
+    ______     process termination (after reaping, if shown)
+
 ***************************************************************************
 
   Sequence of events and fd pluming.