From nobody Sun Nov 24 15:41:13 2024 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 ARC-Seal: i=1; a=rsa-sha256; t=1722415760; cv=none; d=zohomail.com; s=zohoarc; b=ADbgdKQmoG9InpvH+vHElGYy44o8js59NXXtSaao01e2ud/w2t3ka3kGvegqEbS6jalqH9m8olN23xu1XgLSY897kCs4es9OAKW39N/OliSOOEXnMcXo9WZX6fw+ayAdZ1XgT4UMGCOce7Kyw/E8T7cR/EoiYazDOF/6ws0d3+E= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1722415760; 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:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=MacBk+b81Y9XSBf3+Dejb8DivJ0DDo61Nr8SOpG9EWU=; b=Qji9RymkFcXh2K0EktxnghRVF6qLBJam+U91JyidfsEo6yDEQtXR0u8bvUg43zyJixbz/Frtsc1lQCJS4mtdbMujUCty5hH5lCi46MZDRDzff37W0TJimUdxh5M8xE93SZpL1irYEZ9ivQBAPwsW5gVj9WLHLJiFZ2y/q0HqtBU= 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1722415760453379.273842472738; Wed, 31 Jul 2024 01:49:20 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sZ50m-0002Qf-Ge; Wed, 31 Jul 2024 04:48:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sZ50k-0002I1-Ar for qemu-devel@nongnu.org; Wed, 31 Jul 2024 04:48:42 -0400 Received: from mail-wr1-x431.google.com ([2a00:1450:4864:20::431]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sZ50i-0004bf-CR for qemu-devel@nongnu.org; Wed, 31 Jul 2024 04:48:42 -0400 Received: by mail-wr1-x431.google.com with SMTP id ffacd0b85a97d-36874d7f70bso605324f8f.1 for ; Wed, 31 Jul 2024 01:48:39 -0700 (PDT) Received: from carbon-x1.. ([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36b367c0344sm16576425f8f.2.2024.07.31.01.48.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Jul 2024 01:48:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1722415718; x=1723020518; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MacBk+b81Y9XSBf3+Dejb8DivJ0DDo61Nr8SOpG9EWU=; b=2tDVLmMuCAeHdzn0sC78tz2O0WH5aqkqAPMt1D1nce0fwN4b9Iz/sKS+38OW1BrlOY Al98ulw5ft72EyWUx3uzVvyvfF1Ygx0RU+BDQIJTkjmVd/NNtwS+3tPhjoZnLVlOHrcy P2I8r+JEyitRuZf6KIstz/ZdH70ID/+xkeb6H8wEaD47nxdDXQbvFot1fTdxUrijj2J7 0WV6UzVR4zJtTN2X9CZ6c5ATbOfkbCKmXDOwy6lNNgxpNgtq5pylwEQzXojBC7z4uem2 nRkikAZcuoafPopqjyy6NZy1JJKebjpzQaNmE1I/oIbyrFLwpuzfqUavQtQ8rBmfl4j4 YdOg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722415718; x=1723020518; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=MacBk+b81Y9XSBf3+Dejb8DivJ0DDo61Nr8SOpG9EWU=; b=kaAHXX3RF0JaY0kmqc3RFyLqNxXibIiAsHB1AbpYb1tEEjF6R/MgRJvt3SAcjdDSV+ uMqUFlvVxv5Ih62DOM/m5cMtofk9Wi+H8y1gI+i3QCN0eMOCHO+NiNjU+YK+wGk5AwX5 lDZQxRsalKmoibrGvBARzqO+XNAk0aaffOtm2vUCPmt6FoFCj3jHi1hznVnr6/ckvSTm YVh65M9XjMSDwqLrVNSIgYvjOUrpizHSVOMm1FZNGoNvDvrch1lO351gvssYqbf9Qcqg Hhvi8RXGVdQ51dm7u2xPLx4TsbhwA+3KJeCOgbLyoADZRWXbjh03HVmw6kGQDS3QcKzm X09g== X-Gm-Message-State: AOJu0Yx0tjHNZw7JCpx2y3jAdwdg3YTxb9rINHCMXSllFJgh61xUR575 SsIVgvV2szXTImhao7meQZ5wLJ6vQm6f80hWxlmV0FUajHsd4wRstm5hum2O0a6l9+apIFh+ewv j6uI= X-Google-Smtp-Source: AGHT+IFD82QolmIrJcH+O9fEBiISrlJAJHBkvhgIcd+oMOnSShpF9H56hE3GWETiAQxXO5I4qEPmyg== X-Received: by 2002:a05:600c:3ca8:b0:426:6cd1:d104 with SMTP id 5b1f17b1804b1-4280578251bmr90184735e9.4.1722415718319; Wed, 31 Jul 2024 01:48:38 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Peter Maydell , Jason Wang , Richard Henderson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v7 3/5] net/tap: Factorize fd closing after forking Date: Wed, 31 Jul 2024 10:48:27 +0200 Message-ID: <20240731084832.1829291-4-cleger@rivosinc.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240731084832.1829291-1-cleger@rivosinc.com> References: <20240731084832.1829291-1-cleger@rivosinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::431; envelope-from=cleger@rivosinc.com; helo=mail-wr1-x431.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @rivosinc-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1722415761822116600 The same code is used twice to actually close all open file descriptors after forking. Factorize it in a single place. Signed-off-by: Cl=C3=A9ment L=C3=A9ger Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson --- net/tap.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/net/tap.c b/net/tap.c index 51f7aec39d..7b2d5d5703 100644 --- a/net/tap.c +++ b/net/tap.c @@ -385,6 +385,17 @@ static TAPState *net_tap_fd_init(NetClientState *peer, return s; } =20 +static void close_all_fds_after_fork(int excluded_fd) +{ + int open_max =3D sysconf(_SC_OPEN_MAX), i; + + for (i =3D 3; i < open_max; i++) { + if (i !=3D excluded_fd) { + close(i); + } + } +} + static void launch_script(const char *setup_script, const char *ifname, int fd, Error **errp) { @@ -400,13 +411,7 @@ static void launch_script(const char *setup_script, co= nst char *ifname, return; } if (pid =3D=3D 0) { - int open_max =3D sysconf(_SC_OPEN_MAX), i; - - for (i =3D 3; i < open_max; i++) { - if (i !=3D fd) { - close(i); - } - } + close_all_fds_after_fork(fd); parg =3D args; *parg++ =3D (char *)setup_script; *parg++ =3D (char *)ifname; @@ -490,17 +495,11 @@ static int net_bridge_run_helper(const char *helper, = const char *bridge, return -1; } if (pid =3D=3D 0) { - int open_max =3D sysconf(_SC_OPEN_MAX), i; char *fd_buf =3D NULL; char *br_buf =3D NULL; char *helper_cmd =3D NULL; =20 - for (i =3D 3; i < open_max; i++) { - if (i !=3D sv[1]) { - close(i); - } - } - + close_all_fds_after_fork(sv[1]); fd_buf =3D g_strdup_printf("%s%d", "--fd=3D", sv[1]); =20 if (strrchr(helper, ' ') || strrchr(helper, '\t')) { --=20 2.45.2