From cff16f106e9aa4a60178767faaff512db9280371 Mon Sep 17 00:00:00 2001
From: Jim Jagielski <jim@apache.org>
Date: Wed, 5 Mar 2014 13:31:20 +0000
Subject: [PATCH] Merge r1562472, r1561262, r1561923, r1574151 from trunk:

More debugging


More debug messaging... useful for tracking down
if we used attach or create

c89 fix


follow-up to r1562472, 1561262, and 1561923:

Improve messaging...

* easier to tell what went wrong in some cases
* reduce number of debug messages without losing information in some cases

Submitted by: jim, covener, trawick
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1574476 13f79535-47bb-0310-9956-ffa450edef68
---
 STATUS                            |  7 -------
 modules/slotmem/mod_slotmem_shm.c | 18 ++++++++++++++++++
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/STATUS b/STATUS
index f5666c8b01..0c96d17372 100644
--- a/STATUS
+++ b/STATUS
@@ -98,13 +98,6 @@ RELEASE SHOWSTOPPERS:
 PATCHES ACCEPTED TO BACKPORT FROM TRUNK:
   [ start all new proposals below, under PATCHES PROPOSED. ]
 
-   * mod_slotmem_shm: debugging help
-     trunk patch: http://svn.apache.org/r1562472
-                  http://svn.apache.org/r1561262
-                  http://svn.apache.org/r1561923
-                  http://svn.apache.org/r1574151
-     2.4.x patch:  trunk works mod/ next_number
-     +1: jim, ylavic, trawick
 
 
 PATCHES PROPOSED TO BACKPORT FROM TRUNK:
diff --git a/modules/slotmem/mod_slotmem_shm.c b/modules/slotmem/mod_slotmem_shm.c
index 1f7e557cd9..0c4da367d1 100644
--- a/modules/slotmem/mod_slotmem_shm.c
+++ b/modules/slotmem/mod_slotmem_shm.c
@@ -354,6 +354,8 @@ static apr_status_t slotmem_create(ap_slotmem_instance_t **new,
                 if (strcmp(next->name, fname) == 0) {
                     /* we already have it */
                     *new = next;
+                    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02603)
+                                 "create found %s in global list", fname);
                     return APR_SUCCESS;
                 }
                 if (!next->next) {
@@ -362,6 +364,8 @@ static apr_status_t slotmem_create(ap_slotmem_instance_t **new,
                 next = next->next;
             }
         }
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02602)
+                     "create didn't find %s in global list", fname);
     }
     else {
         fbased = 0;
@@ -379,15 +383,24 @@ static apr_status_t slotmem_create(ap_slotmem_instance_t **new,
         rv = APR_EINVAL;
     }
     if (rv == APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02598)
+                     "apr_shm_attach() succeeded");
+
         /* check size */
         if (apr_shm_size_get(shm) != size) {
             apr_shm_detach(shm);
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(02599)
+                         "existing shared memory for %s could not be used (failed size check)",
+                         fname);
             return APR_EINVAL;
         }
         ptr = (char *)apr_shm_baseaddr_get(shm);
         memcpy(&desc, ptr, sizeof(desc));
         if (desc.size != item_size || desc.num != item_num) {
             apr_shm_detach(shm);
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(02600)
+                         "existing shared memory for %s could not be used (failed contents check)",
+                         fname);
             return APR_EINVAL;
         }
         ptr += AP_SLOTMEM_OFFSET;
@@ -401,6 +414,11 @@ static apr_status_t slotmem_create(ap_slotmem_instance_t **new,
         else {
             rv = apr_shm_create(&shm, size, NULL, gpool);
         }
+        ap_log_error(APLOG_MARK, rv == APR_SUCCESS ? APLOG_DEBUG : APLOG_ERR,
+                     rv, ap_server_conf, APLOGNO(02611)
+                     "create: apr_shm_create(%s) %s",
+                     fname ? fname : "",
+                     rv == APR_SUCCESS ? "succeeded" : "failed");
         if (rv != APR_SUCCESS) {
             return rv;
         }
-- 
2.50.1