{"id":18381,"url":"https://patchwork.libcamera.org/api/1.1/patches/18381/?format=json","web_url":"https://patchwork.libcamera.org/patch/18381/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20230312212205.44168-1-mail@eliasnaur.com>","date":"2023-03-12T21:22:05","name":"[libcamera-devel,v2] libcamera: v4l2_device: openat(2) with O_CLOEXEC to cleanup after exec(3)","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"783510309fb0c67f0bbc16a4af911c9b430ff652","submitter":{"id":159,"url":"https://patchwork.libcamera.org/api/1.1/people/159/?format=json","name":"Elias Naur","email":"mail@eliasnaur.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/18381/mbox/","series":[{"id":3801,"url":"https://patchwork.libcamera.org/api/1.1/series/3801/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3801","date":"2023-03-12T21:22:05","name":"[libcamera-devel,v2] libcamera: v4l2_device: openat(2) with O_CLOEXEC to cleanup after exec(3)","version":2,"mbox":"https://patchwork.libcamera.org/series/3801/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/18381/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/18381/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 680BBBD80A\n\tfor ;\n\tSun, 12 Mar 2023 21:22:28 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id A31A262709;\n\tSun, 12 Mar 2023 22:22:27 +0100 (CET)","from mail-ua1-x935.google.com (mail-ua1-x935.google.com\n\t[IPv6:2607:f8b0:4864:20::935])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 65F6762705\n\tfor ;\n\tSun, 12 Mar 2023 22:22:26 +0100 (CET)","by mail-ua1-x935.google.com with SMTP id 89so160212uao.0\n\tfor ;\n\tSun, 12 Mar 2023 14:22:26 -0700 (PDT)","from localhost.localdomain ([190.53.0.133])\n\tby smtp.gmail.com with ESMTPSA id\n\tw143-20020a1fad95000000b003bd94c3a733sm909594vke.0.2023.03.12.14.22.23\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tSun, 12 Mar 2023 14:22:24 -0700 (PDT)"],"DKIM-Signature":["v=1; 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\n\tSun, 12 Mar 2023 14:22:24 -0700 (PDT)","To":"libcamera-devel@lists.libcamera.org","Date":"Sun, 12 Mar 2023 15:22:05 -0600","Message-Id":"<20230312212205.44168-1-mail@eliasnaur.com>","X-Mailer":"git-send-email 2.39.2","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v2] libcamera: v4l2_device: openat(2) with\n\tO_CLOEXEC to cleanup after exec(3)","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","From":"Elias Naur via libcamera-devel ","Reply-To":"Elias Naur ","Cc":"Elias Naur ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"It's generally a good idea to openat(2) with O_CLOEXEC, but this patch\nalso fixes a real (corner-)case: I have an excutable that (1) uses\nv4l2-compat to drive a RPi camera, (2) self-updates through exec(3).\nWithout O_CLOEXEC of the kernel devices, an update while the\ncamera is opened will result in -EBUSY errors when the update tries to\nopen the camera.\n\nSigned-off-by: Elias Naur \n---\n\nThis update fixes a style issue raised through review and clarifies the\n motivatition for the fix.\n\n src/libcamera/v4l2_device.cpp | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git src/libcamera/v4l2_device.cpp src/libcamera/v4l2_device.cpp\nindex 57a88d96..9eb26839 100644\n--- src/libcamera/v4l2_device.cpp\n+++ src/libcamera/v4l2_device.cpp\n@@ -86,7 +86,7 @@ int V4L2Device::open(unsigned int flags)\n \t\treturn -EBUSY;\n \t}\n \n-\tUniqueFD fd(syscall(SYS_openat, AT_FDCWD, deviceNode_.c_str(), flags));\n+\tUniqueFD fd(syscall(SYS_openat, AT_FDCWD, deviceNode_.c_str(), flags | O_CLOEXEC));\n \tif (!fd.isValid()) {\n \t\tint ret = -errno;\n \t\tLOG(V4L2, Error) << \"Failed to open V4L2 device '\"\n","prefixes":["libcamera-devel","v2"]}