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commit 28f9d86ea89f88b24f1d12c8e9d5ddc3f77da194
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Author: Mark Wielaard <mark@klomp.org>
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Date:   Fri May 6 00:29:28 2022 +0200
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    debuginfod: Use MHD_USE_EPOLL for libmicrohttpd version 0.9.51 or higher
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    Also disable MHD_USE_THREAD_PER_CONNECTION when using MHD_USE_EPOLL.
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    https://sourceware.org/bugzilla/show_bug.cgi?id=29123
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    Signed-off-by: Mark Wielaard <mark@klomp.org>
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diff --git a/debuginfod/debuginfod.cxx b/debuginfod/debuginfod.cxx
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index c02540f1..d4f47bf7 100644
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--- a/debuginfod/debuginfod.cxx
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+++ b/debuginfod/debuginfod.cxx
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@@ -1,6 +1,6 @@
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 /* Debuginfo-over-http server.
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    Copyright (C) 2019-2021 Red Hat, Inc.
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-   Copyright (C) 2021 Mark J. Wielaard <mark@klomp.org>
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+   Copyright (C) 2021, 2022 Mark J. Wielaard <mark@klomp.org>
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    This file is part of elfutils.
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    This file is free software; you can redistribute it and/or modify
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@@ -3899,7 +3899,14 @@ main (int argc, char *argv[])
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         }
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     }
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-  unsigned int mhd_flags = ((connection_pool
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+  /* Note that MHD_USE_EPOLL and MHD_USE_THREAD_PER_CONNECTION don't
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+     work together.  */
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+  unsigned int use_epoll = 0;
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+#if MHD_VERSION >= 0x00095100
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+  use_epoll = MHD_USE_EPOLL;
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+#endif
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+
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+  unsigned int mhd_flags = ((connection_pool || use_epoll
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 			     ? 0 : MHD_USE_THREAD_PER_CONNECTION)
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 #if MHD_VERSION >= 0x00095300
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 			    | MHD_USE_INTERNAL_POLLING_THREAD
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@@ -3907,9 +3914,7 @@ main (int argc, char *argv[])
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 			    | MHD_USE_SELECT_INTERNALLY
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 #endif
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 			    | MHD_USE_DUAL_STACK
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-#ifdef MHD_USE_EPOLL
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-			    | MHD_USE_EPOLL
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-#endif
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+			    | use_epoll
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 #if MHD_VERSION >= 0x00095200
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 			    | MHD_USE_ITC
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 #endif