[process info] Remove assert in DoGetGroupName

[wallace]

Summary

Disabling this assert prevents lldb-server from crashing, which prevents it from finding the user and group names of a given process list.

Before this change, the process list didn't contain names:

PID    PARENT USER       GROUP      EFF USER   EFF GROUP  TRIPLE                               ARGUMENTS
====== ====== ========== ========== ========== ========== ============================== ============================
27585  982    10098      10098      10098      10098                                     com.LogiaGroup.LogiaDeck
27623  982    10098      10098      10098      10098                                     com.digitalturbine.ignite.suspend.DataUsageRecorderService
28024  982    10199      10199      10199      10199                                     com.google.vr.vrcore
28061  983    10353      10353      10353      10353                                     com.instagram.android:videoplayer
28121  982    10045      10045      10045      10045                                     com.sec.spp.push
28325  982    10247      10247      10247      10247                                     com.facebook.orca
28714  982    10367      10367      10367      10367                                     com.samsung.android.dialer
29867  3208   2000       2000       2000       2000       aarch64-unknown-linux-android  /system/bin/sh-c /data/local/tmp/lldb-server platform --listen *:5557 --server --log-file /data/local/tmp/logs --log-channels gdb-remote all --log-channels lldb all

After this change, the list looks much better

PID    PARENT USER       GROUP      EFF USER   EFF GROUP  TRIPLE                               ARGUMENTS
====== ====== ========== ========== ========== ========== ============================== ============================
24459  1      wifi       1010       wifi       1010       aarch64-unknown-linux-android  /vendor/bin/hw/wpa_supplicant-O/data/vendor/wifi/wpa/sockets -puse_p2p_group_interface=1 -g@android:wpa_wlan0
25098  982    u0_a42     10042      u0_a42     10042                                     com.samsung.android.messaging
25442  982    u0_a65     10065      u0_a65     10065                                     com.samsung.android.mobileservice
25974  982    u0_a9      10009      u0_a9      10009                                     com.samsung.android.contacts
26377  982    radio      1001       radio      1001                                      com.samsung.android.incallui
26390  983    u0_a26     10026      u0_a26     10026                                     com.samsung.android.game.gametools
26876  983    u0_a306    10306      u0_a306    10306                                     com.tencent.mm:push

[labath]

I am happy to accept this patch as-is, but since you seem to be on a quest to improve the process listing I thought I'd mention that getgrgid_r seems to be available on android since API level 24, and getgrgid since pretty much forever (I think it may not have been exposed in old ndk releases). So, you could massage this code a bit to enable group name resolution on android too (but you don't have to).

[wallace]

This has been committed

lldb/source/Host/posix/HostInfoPosix.cpp

 //===-- HostInfoPosix.cpp ---------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Host/posix/HostInfoPosix.h"
-#include "lldb/Utility/UserIDResolver.h"
 #include "lldb/Utility/Log.h"
+#include "lldb/Utility/UserIDResolver.h"
 
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include <grp.h>
 #include <limits.h>
if (group_info_ptr)
       return std::string(group_info_ptr->gr_name);
   } else {
     // The threadsafe version isn't currently working for me on darwin, but the
     // non-threadsafe version is, so I am calling it below.
     group_info_ptr = ::getgrgid(gid);
     if (group_info_ptr)
       return std::string(group_info_ptr->gr_name);
   }
-#else
-  assert(false && "getgrgid_r() not supported on Android");
 #endif
   return llvm::None;
 }
 
 static llvm::ManagedStatic<PosixUserIDResolver> g_user_id_resolver;
 
 UserIDResolver &HostInfoPosix::GetUserIDResolver() {
   return *g_user_id_resolver;