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Wed, 29 Apr 2026 13:15:13 -0700 (PDT) Received: from localhost ([2001:8a0:facb:a800:f22f:591f:e700:e91]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-48a81ed6b65sm22504165e9.3.2026.04.29.13.15.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Apr 2026 13:15:13 -0700 (PDT) From: Pedro Alves To: gdb-patches@sourceware.org Cc: Hannes Domani , Eli Zaretskii , Tom Tromey Subject: [PATCH v3 01/11] Windows gdb+gdbserver: Check whether DBG_REPLY_LATER is available Date: Wed, 29 Apr 2026 21:14:57 +0100 Message-ID: <20260429201507.480870-2-pedro@palves.net> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260429201507.480870-1-pedro@palves.net> References: <20260429201507.480870-1-pedro@palves.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org Per , DBG_REPLY_LATER is "Supported in Windows 10, version 1507 or above, ..." Since we support versions of Windows older than 10, we need to know whether DBG_REPLY_LATER is available. And we need to know this before starting any inferior. This adds a function that probes for support (and caches the result), by trying to call ContinueDebugEvent on pid=0,tid=0 with DBG_REPLY_LATER, and inspecting the resulting error. Suggested-by: Hannes Domani Suggested-by: Eli Zaretskii Approved-By: Tom Tromey Change-Id: Ia27b981aeecaeef430ec90cebc5b3abdce00449d commit-id:9098a060 --- gdb/nat/windows-nat.c | 20 ++++++++++++++++++++ gdb/nat/windows-nat.h | 9 +++++++++ 2 files changed, 29 insertions(+) diff --git a/gdb/nat/windows-nat.c b/gdb/nat/windows-nat.c index c6434348607..cf30a66a0c1 100644 --- a/gdb/nat/windows-nat.c +++ b/gdb/nat/windows-nat.c @@ -917,6 +917,26 @@ disable_randomization_available () /* See windows-nat.h. */ +bool +dbg_reply_later_available () +{ + static int available = -1; + if (available == -1) + { + /* DBG_REPLY_LATER is supported since Windows 10, Version 1507. + If supported, this fails with ERROR_INVALID_HANDLE (tested on + Win10 and Win11). If not supported, it fails with + ERROR_INVALID_PARAMETER (tested on Win7). */ + if (ContinueDebugEvent (0, 0, DBG_REPLY_LATER)) + internal_error (_("ContinueDebugEvent call should not " + "have succeeded")); + available = (GetLastError () != ERROR_INVALID_PARAMETER); + } + return available; +} + +/* See windows-nat.h. */ + bool initialize_loadable () { diff --git a/gdb/nat/windows-nat.h b/gdb/nat/windows-nat.h index 45d186f771a..0a503232718 100644 --- a/gdb/nat/windows-nat.h +++ b/gdb/nat/windows-nat.h @@ -535,6 +535,15 @@ enum_process_modules (WOW64_CONTEXT *, HANDLE process, } #endif +/* This is available starting with Windows 10. */ +#ifndef DBG_REPLY_LATER +# define DBG_REPLY_LATER 0x40010001L +#endif + +/* Return true if it's possible to use DBG_REPLY_LATER with + ContinueDebugEvent on this host. */ +extern bool dbg_reply_later_available (); + /* Load any functions which may not be available in ancient versions of Windows. */ -- 2.53.0