Merge branch 'bug31615_040' into bug31615_041

Merged modified lines from bug31615_040, and unmodified lines
from maint-0.4.1.

changes/bug31615

+  o Minor bugfixes (subsystems):
+    - Make the subsystem init order match the subsystem module dependencies.
+      Call windows process security APIs as early as possible. Init log before
+      network and time, so that network and time can use logging.
+      Fixes bug 31615; bugfix on 0.4.0.1-alpha.

src/app/main/subsystem_list.c

@@ -32,23 +32,25 @@
 
 /**
  * Global list of the subsystems in Tor, in the order of their initialization.
+ * Want to know the exact level numbers?
+ * We'll implement a level dump command in #31614.
  **/
 const subsys_fns_t *tor_subsystems[] = {
-  &sys_winprocess, /* -100 */
-  &sys_torerr, /* -100 */
-  &sys_wallclock, /* -99 */
-  &sys_threads, /* -95 */
-  &sys_logging, /* -90 */
-  &sys_time, /* -90 */
-  &sys_network, /* -90 */
-  &sys_compress, /* -70 */
-  &sys_crypto, /* -60 */
-  &sys_tortls, /* -50 */
-  &sys_process, /* -35 */
-
-  &sys_orconn_event, /* -33 */
-  &sys_ocirc_event, /* -32 */
-  &sys_btrack, /* -30 */
+  &sys_winprocess,
+  &sys_torerr,
+  &sys_wallclock,
+  &sys_threads,
+  &sys_logging,
+  &sys_time,
+  &sys_network,
+  &sys_compress,
+  &sys_crypto,
+  &sys_tortls,
+  &sys_process,
+
+  &sys_orconn_event,
+  &sys_ocirc_event,
+  &sys_btrack,
 
   &sys_mainloop, /* 5 */
   &sys_or, /* 20 */

src/lib/err/torerr_sys.c

@@ -33,7 +33,10 @@ subsys_torerr_shutdown(void)
 
 const subsys_fns_t sys_torerr = {
   .name = "err",
-  .level = -100,
+  /* Low-level error handling is a diagnostic feature, we want it to init
+   * right after windows process security, and shutdown last.
+   * (Security never shuts down.) */
+  .level = -99,
   .supported = true,
   .initialize = subsys_torerr_initialize,
   .shutdown = subsys_torerr_shutdown

src/lib/log/log_sys.c

@@ -29,6 +29,8 @@ subsys_logging_shutdown(void)
 const subsys_fns_t sys_logging = {
   .name = "log",
   .supported = true,
+  /* Logging depends on threads, approx time, raw logging, and security.
+   * Most other lib modules depend on logging. */
   .level = -90,
   .initialize = subsys_logging_initialize,
   .shutdown = subsys_logging_shutdown,

src/lib/net/network_sys.c

@@ -37,7 +37,9 @@ subsys_network_shutdown(void)
 
 const subsys_fns_t sys_network = {
   .name = "network",
-  .level = -90,
+  /* Network depends on logging, and a lot of other modules depend on network.
+   */
+  .level = -80,
   .supported = true,
   .initialize = subsys_network_initialize,
   .shutdown = subsys_network_shutdown,

src/lib/process/winprocess_sys.c

@@ -58,6 +58,8 @@ subsys_winprocess_initialize(void)
 
 const subsys_fns_t sys_winprocess = {
   .name = "winprocess",
+  /* HeapEnableTerminationOnCorruption and setdeppolicy() are security
+   * features, we want them to run first. */
   .level = -100,
   .supported = WINPROCESS_SYS_ENABLED,
   .initialize = subsys_winprocess_initialize,

src/lib/thread/compat_threads.c

@@ -122,6 +122,8 @@ subsys_threads_initialize(void)
 const subsys_fns_t sys_threads = {
   .name = "threads",
   .supported = true,
+  /* Threads is used by logging, which is a diagnostic feature, we want it to
+   * init right after low-level error handling and approx time. */
   .level = -95,
   .initialize = subsys_threads_initialize,
 };

src/lib/time/time_sys.c

@@ -20,7 +20,9 @@ subsys_time_initialize(void)
 
 const subsys_fns_t sys_time = {
   .name = "time",
-  .level = -90,
+  /* Monotonic time depends on logging, and a lot of other modules depend on
+   * monotonic time. */
+  .level = -80,
   .supported = true,
   .initialize = subsys_time_initialize,
 };

src/lib/wallclock/approx_time.c

@@ -54,6 +54,8 @@ subsys_wallclock_initialize(void)
 const subsys_fns_t sys_wallclock = {
   .name = "wallclock",
   .supported = true,
-  .level = -99,
+  /* Approximate time is a diagnostic feature, we want it to init right after
+   * low-level error handling. */
+  .level = -98,
   .initialize = subsys_wallclock_initialize,
 };