From patchwork Mon Jan 14 00:03:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Samuel Thibault X-Patchwork-Id: 10761531 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F1DBD1390 for ; Mon, 14 Jan 2019 00:40:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E00512897D for ; Mon, 14 Jan 2019 00:40:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CF64328981; Mon, 14 Jan 2019 00:40:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 75729288DC for ; Mon, 14 Jan 2019 00:40:04 +0000 (UTC) Received: from localhost ([127.0.0.1]:46062 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1giqIN-0004aK-P2 for patchwork-qemu-devel@patchwork.kernel.org; Sun, 13 Jan 2019 19:40:03 -0500 Received: from eggs.gnu.org ([209.51.188.92]:51646) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gipka-0003Kx-Bo for qemu-devel@nongnu.org; Sun, 13 Jan 2019 19:05:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gipkZ-0006jm-EL for qemu-devel@nongnu.org; Sun, 13 Jan 2019 19:05:08 -0500 Received: from hera.aquilenet.fr ([185.233.100.1]:60528) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gipkZ-0006Yv-2o for qemu-devel@nongnu.org; Sun, 13 Jan 2019 19:05:07 -0500 Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id 1D0781B77; Mon, 14 Jan 2019 01:04:37 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kk1lVkZDo0f0; Mon, 14 Jan 2019 01:04:34 +0100 (CET) Received: from function.home (lfbn-1-11161-124.w86-213.abo.wanadoo.fr [86.213.235.124]) by hera.aquilenet.fr (Postfix) with ESMTPSA id DFC5C1BBE; Mon, 14 Jan 2019 01:04:09 +0100 (CET) Received: from samy by function.home with local (Exim 4.92-RC4) (envelope-from ) id 1gipja-0007p0-SF; Mon, 14 Jan 2019 01:04:06 +0100 From: Samuel Thibault To: qemu-devel@nongnu.org Date: Mon, 14 Jan 2019 01:03:05 +0100 Message-Id: <20190114000326.29847-45-samuel.thibault@ens-lyon.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190114000326.29847-1-samuel.thibault@ens-lyon.org> References: <20190114000326.29847-1-samuel.thibault@ens-lyon.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 185.233.100.1 Subject: [Qemu-devel] [PULL 44/65] slirp: simplify fork_exec() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Samuel Thibault , stefanha@redhat.com, jan.kiszka@siemens.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Marc-André Lureau Use g_spawn_async_with_fds() to setup the child. GSpawn handles reaping the child, and closing parent file descriptors. Signed-off-by: Marc-André Lureau Signed-off-by: Samuel Thibault --- slirp/misc.c | 75 +++++++++++++++++++++++++--------------------------- 1 file changed, 36 insertions(+), 39 deletions(-) diff --git a/slirp/misc.c b/slirp/misc.c index ee3492a2ae..753b3da25b 100644 --- a/slirp/misc.c +++ b/slirp/misc.c @@ -129,56 +129,53 @@ err: return -1; } +static void +fork_exec_child_setup(gpointer data) +{ + setsid(); +} + int fork_exec(struct socket *so, const char *ex) { - char **argv; - int opt, c, sp[2]; - pid_t pid; + GError *err = NULL; + char **argv; + int opt, sp[2]; - DEBUG_CALL("fork_exec"); - DEBUG_ARG("so = %p", so); - DEBUG_ARG("ex = %p", ex); + DEBUG_CALL("fork_exec"); + DEBUG_ARG("so = %p", so); + DEBUG_ARG("ex = %p", ex); if (slirp_socketpair_with_oob(sp) < 0) { return 0; } - pid = fork(); - switch(pid) { - case -1: - error_report("Error: fork failed: %s", strerror(errno)); - closesocket(sp[0]); - closesocket(sp[1]); - return 0; - - case 0: - setsid(); - dup2(sp[1], 0); - dup2(sp[1], 1); - dup2(sp[1], 2); - for (c = getdtablesize() - 1; c >= 3; c--) - close(c); + argv = g_strsplit(ex, " ", -1); + g_spawn_async_with_fds(NULL /* cwd */, + argv, + NULL /* env */, + G_SPAWN_SEARCH_PATH, + fork_exec_child_setup, NULL /* data */, + NULL /* child_pid */, + sp[1], sp[1], sp[1], + &err); + g_strfreev(argv); - argv = g_strsplit(ex, " ", -1); - execvp(argv[0], (char **)argv); - - /* Ooops, failed, let's tell the user why */ - fprintf(stderr, "Error: execvp of %s failed: %s\n", - argv[0], strerror(errno)); - close(0); close(1); close(2); /* XXX */ - exit(1); + if (err) { + error_report("%s", err->message); + g_error_free(err); + closesocket(sp[0]); + closesocket(sp[1]); + return 0; + } - default: - so->s = sp[0]; - closesocket(sp[1]); - qemu_add_child_watch(pid); - socket_set_fast_reuse(so->s); - opt = 1; - qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int)); - qemu_set_nonblock(so->s); - return 1; - } + so->s = sp[0]; + closesocket(sp[1]); + socket_set_fast_reuse(so->s); + opt = 1; + qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int)); + qemu_set_nonblock(so->s); + return 1; } #endif