[PATCH resend] ntdll: Implement JobObjectBasicProcessIdList for NtQueryInformationJobObject. - wine-devel

12 Aug 2021

Signed-off-by: Gabriel Ivăncescu gabrielopcode@gmail.com
---
Resending as it fell off the list. Anything holding this up or anything I
should improve on it?
I realize the memcpy thing may be not ideal, but it avoids a pointless
allocation + copy. Similar logic is done in user32's list_window_children,
where it copies from user_handle_t to HWND in-place, but that can suffer
from aliasing issues without memcpy since it's a different type, otherwise
should compile to same code when optimized. But if that's not needed I can
just use a direct assignment instead.
Or is there something else about it that can be improved?
dlls/kernel32/tests/process.c |  9 ---------
 dlls/ntdll/unix/sync.c        | 31 ++++++++++++++++++++++++++++---
 server/process.c              | 34 ++++++++++++++++++++++++++++++++++
 server/protocol.def           |  9 +++++++++
 4 files changed, 71 insertions(+), 12 deletions(-)

diff --git a/dlls/kernel32/tests/process.c b/dlls/kernel32/tests/process.c
index e729bca..1c056fb 100644
--- a/dlls/kernel32/tests/process.c
+++ b/dlls/kernel32/tests/process.c
@@ -2700,15 +2700,11 @@ static void test_QueryInformationJobObject(void)
     pid_list->NumberOfProcessIdsInList  = 42;
     ret = QueryInformationJobObject(job, JobObjectBasicProcessIdList, pid_list,
                                     FIELD_OFFSET(JOBOBJECT_BASIC_PROCESS_ID_LIST, ProcessIdList[1]), &ret_len);
-    todo_wine
     ok(!ret, "QueryInformationJobObject expected failure\n");
-    todo_wine
     expect_eq_d(ERROR_MORE_DATA, GetLastError());
     if (ret)
     {
-        todo_wine
         expect_eq_d(42, pid_list->NumberOfAssignedProcesses);
-        todo_wine
         expect_eq_d(42, pid_list->NumberOfProcessIdsInList);
     }
@@ -2723,17 +2719,12 @@ static void test_QueryInformationJobObject(void)
         {
             ULONG_PTR *list = pid_list->ProcessIdList;
-            todo_wine
             ok(ret_len == FIELD_OFFSET(JOBOBJECT_BASIC_PROCESS_ID_LIST, ProcessIdList[2]),
                "QueryInformationJobObject returned ret_len=%u\n", ret_len);
-            todo_wine
             expect_eq_d(2, pid_list->NumberOfAssignedProcesses);
-            todo_wine
             expect_eq_d(2, pid_list->NumberOfProcessIdsInList);
-            todo_wine
             expect_eq_d(pi[0].dwProcessId, list[0]);
-            todo_wine
             expect_eq_d(pi[1].dwProcessId, list[1]);
         }
     }
diff --git a/dlls/ntdll/unix/sync.c b/dlls/ntdll/unix/sync.c
index a13e53a..0594a5e 100644
--- a/dlls/ntdll/unix/sync.c
+++ b/dlls/ntdll/unix/sync.c
@@ -791,11 +791,36 @@ NTSTATUS WINAPI NtQueryInformationJobObject( HANDLE handle, JOBOBJECTINFOCLASS c
     case JobObjectBasicProcessIdList:
     {
         JOBOBJECT_BASIC_PROCESS_ID_LIST *process = info;
+        DWORD count, i;
if (len < sizeof(*process)) return STATUS_INFO_LENGTH_MISMATCH;
-        memset( process, 0, sizeof(*process) );
-        if (ret_len) *ret_len = sizeof(*process);
-        return STATUS_SUCCESS;
+
+        count  = len - FIELD_OFFSET(JOBOBJECT_BASIC_PROCESS_ID_LIST, ProcessIdList);
+        count /= sizeof(process->ProcessIdList[0]);
+
+        SERVER_START_REQ( query_job_pids )
+        {
+            req->job = wine_server_user_handle(handle);
+            wine_server_set_reply(req, process->ProcessIdList, count * sizeof(process_id_t));
+            if ((ret = wine_server_call(req)) != STATUS_SUCCESS)
+                return ret;
+            process->NumberOfAssignedProcesses = reply->count;
+            process->NumberOfProcessIdsInList = min(count, reply->count);
+        }
+        SERVER_END_REQ;
+
+        if (sizeof(process_id_t) < sizeof(process->ProcessIdList[0]))
+        {
+            /* start from the end to not overwrite */
+            for (i = process->NumberOfProcessIdsInList; i--;)
+            {
+                ULONG_PTR id = ((process_id_t*)(&process->ProcessIdList[0]))[i];
+                memcpy(&process->ProcessIdList[i], &id, sizeof(id));
+            }
+        }
+
+        if (ret_len) *ret_len = (char*)(&process->ProcessIdList[process->NumberOfProcessIdsInList]) - (char*)process;
+        return count < process->NumberOfAssignedProcesses ? STATUS_MORE_ENTRIES : STATUS_SUCCESS;
     }
     case JobObjectExtendedLimitInformation:
     {
diff --git a/server/process.c b/server/process.c
index 0870de5..48e632a 100644
--- a/server/process.c
+++ b/server/process.c
@@ -286,6 +286,24 @@ static int process_in_job( struct job *job, struct process *process )
     return process->job == job;
 }
+static data_size_t query_job_pids( struct job *job, data_size_t count, data_size_t maxcount, process_id_t *pids )
+{
+    struct process *process;
+    struct job *j;
+
+    LIST_FOR_EACH_ENTRY( j, &job->child_job_list, struct job, parent_job_entry )
+        count = query_job_pids( j, count, maxcount, pids );
+
+    LIST_FOR_EACH_ENTRY( process, &job->process_list, struct process, job_entry )
+    {
+        if (process->end_time) continue;
+        if (count < maxcount) pids[count] = process->id;
+        count++;
+    }
+
+    return count;
+}
+
 static void add_job_process( struct job *job, struct process *process )
 {
     struct job *j, *common_parent;
@@ -1741,6 +1759,22 @@ DECL_HANDLER(process_in_job)
     release_object( process );
 }
+/* get a list of the pids associated with the job */
+DECL_HANDLER(query_job_pids)
+{
+    struct job *job = get_job_obj( current->process, req->job, JOB_OBJECT_QUERY );
+    process_id_t *pids;
+    data_size_t len;
+
+    if (!job) return;
+
+    reply->count = query_job_pids( job, 0, 0, NULL );
+
+    len = min( get_reply_max_size(), reply->count * sizeof(*pids) );
+    if (len && ((pids = set_reply_data_size( len ))))
+        query_job_pids( job, 0, len / sizeof(*pids), pids );
+}
+
 /* retrieve information about a job */
 DECL_HANDLER(get_job_info)
 {
diff --git a/server/protocol.def b/server/protocol.def
index 133d6ad..5d97cb5 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -3671,6 +3671,15 @@ struct handle_info
 @END
+/* Query a list of pids associated with the job */
+@REQ(query_job_pids)
+    obj_handle_t job;             /* handle to the job */
+@REPLY
+    data_size_t count;            /* number of processes associated with the job */
+    VARARG(pids,uints);           /* list of pids */
+@END
+
+
 /* Set limit flags on a job */
 @REQ(set_job_limits)
     obj_handle_t handle;          /* handle to the job */
-- 
2.31.1



    