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Signed-off-by: Filip Hejsek Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-stdio.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/chardev/char-stdio.c b/chardev/char-stdio.c index f63bf413c7..16b49fd924 100644 --- a/chardev/char-stdio.c +++ b/chardev/char-stdio.c @@ -114,6 +114,7 @@ static bool stdio_chr_open(Chardev *chr, ChardevBackend= *backend, Error **errp) StdioChardev *s =3D STDIO_CHARDEV(chr); ChardevStdio *opts =3D backend->u.stdio.data; struct sigaction act; + int fd_in, fd_out; =20 if (is_daemonized()) { error_setg(errp, "cannot use stdio with -daemonize"); @@ -133,7 +134,20 @@ static bool stdio_chr_open(Chardev *chr, ChardevBacken= d *backend, Error **errp) return false; } =20 - if (!qemu_chr_open_fd(chr, 0, 1, errp)) { + fd_in =3D qemu_dup(0); + if (fd_in < 0) { + error_setg_errno(errp, errno, "Failed to dup stdin fd"); + return false; + } + fd_out =3D qemu_dup(1); + if (fd_out < 0) { + error_setg_errno(errp, errno, "Failed to dup stdout fd"); + qemu_close(fd_in); + return false; + } + if (!qemu_chr_open_fd(chr, fd_in, fd_out, errp)) { + qemu_close(fd_in); + qemu_close(fd_out); return false; } =20 --=20 2.56.0 From nobody Fri Oct 23 14:29:03 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1792192226; cv=none; d=zohomail.com; s=zohoarc; b=hFv1Lsa1r5LjoCCrpm/v+fy4D7hU0126sYzjNtVYot0229TSAkQ3ZUCsiJ1Bz5hFzJ5wF1C2hubOJoaJPsOo/OSk+bA1FRmk4P/y7i8pqcWaNUhvIXE5TOksjfV/XRhaclBB8KdlvEm4Jz9ezdOMnSkpKGz0pmNZuvOXQwNpEeM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1792192226; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=PilHsZjcEqFGHnD62Vrw08iZjdj9emsAmAEgEd76DEM=; b=DfBaPqcx8/MmVweFeywofGZrz7MgDyw2VHBiEb3fOAD5CXBmvXEmhzUntYPH0uXC5Da+MvO+7h5DfmQRMkbsUFc+w53lDObBPR7sYrO/GCZOtYLoO3YOAO9sie4AcpjrnkxowwxLUST64Z+YC1RK26awG8HGLSi51FG6TPjZBtU= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1792192226643854.9030889406173; Fri, 16 Oct 2026 16:10:26 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1xHr3X-0000po-KU; Fri, 16 Oct 2026 19:09:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xHr3S-0000pT-1s for qemu-devel@nongnu.org; Fri, 16 Oct 2026 19:09:38 -0400 Received: from mail-wr1-x430.google.com ([2a00:1450:4864:20::430]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1xHr3Q-0008K6-FX for qemu-devel@nongnu.org; Fri, 16 Oct 2026 19:09:37 -0400 Received: by mail-wr1-x430.google.com with SMTP id ffacd0b85a97d-48de72fc832so241891f8f.1 for ; Fri, 16 Oct 2026 16:09:36 -0700 (PDT) Received: from localhost (mem-185.47.220.165.jmnet.cz. 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Closing stdio fds is typically unwanted, so warn when they are passed to qio_channel_file_new_fd(). Change the documentation of qio_channel_file_new_fd() to explicitly say that passing stdio descriptors is incorrect. Signed-off-by: Filip Hejsek Reviewed-by: Marc-Andr=C3=A9 Lureau --- include/io/channel-file.h | 12 ++++++++---- io/channel-file.c | 6 ++++++ 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/include/io/channel-file.h b/include/io/channel-file.h index d373a4e44d..6a6776ff8e 100644 --- a/include/io/channel-file.h +++ b/include/io/channel-file.h @@ -58,10 +58,14 @@ struct QIOChannelFile { * should be used instead, as this provides greater * functionality and cross platform portability. * - * The channel will own the passed in file descriptor - * and will take responsibility for closing it, so the - * caller must not close it. If appropriate the caller - * should dup() its FD before opening the channel. + * The channel will own the file descriptor that was + * passed to it and will take responsibility for closing + * it. This means the caller must not close it, and must + * not pass in descriptors that will remain in use after + * the channel is destroyed. In particular, @fd must + * not be one of the stdin/stdout/stderr descriptors. If + * requiring a channel to wrap a descriptor that should + * remain open, use qio_channel_file_new_dupfd() instead. * * Returns: the new channel object */ diff --git a/io/channel-file.c b/io/channel-file.c index 5cef75a67c..4c9da6619b 100644 --- a/io/channel-file.c +++ b/io/channel-file.c @@ -23,6 +23,7 @@ #include "io/channel-util.h" #include "io/channel-watch.h" #include "qapi/error.h" +#include "qemu/error-report.h" #include "qemu/module.h" #include "qemu/sockets.h" #include "trace.h" @@ -32,6 +33,11 @@ qio_channel_file_new_fd(int fd) { QIOChannelFile *ioc; =20 + if (fd <=3D STDERR_FILENO) { + warn_report("potential bug: creating a channel from stdio fd %d; " + "the fd will be closed when the channel is destroyed",= fd); + } + ioc =3D QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE)); =20 ioc->fd =3D fd; --=20 2.56.0