[{"id":11841,"web_url":"https://patchwork.libcamera.org/comment/11841/","msgid":"<20200804181930.GG6075@pendragon.ideasonboard.com>","date":"2020-08-04T18:19:30","subject":"Re: [libcamera-devel] [PATCH v7 3/9] libcamera: v4l2_device: Add\n\tmethod to lookup device path","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/people/2/","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"content":"Hi Niklas,\n\nThank you for the patch.\n\nOn Tue, Aug 04, 2020 at 06:13:52PM +0200, Niklas Söderlund wrote:\n> Add a method to lookup a V4L2 devices path in sysfs.\n> \n> Signed-off-by: Niklas Söderlund \n> ---\n> * Changes since v6\n> - Use sysfs:: helper.\n> - Do not try to return std::string { nullptr } on error.\n> \n> * Changes since v5\n> - Expand documentation\n> - Use DeviceEnumerator interface to lookup device path\n> - Include stdlib.h\n> - Use realpath(..., nullptr); ...; free();\n> \n> * Changes since v3\n> - s/the device path/the device path in sysfs/\n> ---\n> include/libcamera/internal/v4l2_device.h | 1 +\n> src/libcamera/v4l2_device.cpp | 28 ++++++++++++++++++++++++\n> 2 files changed, 29 insertions(+)\n> \n> diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\n> index bf643f2ec966bb33..3b605aab343b3b94 100644\n> --- a/include/libcamera/internal/v4l2_device.h\n> +++ b/include/libcamera/internal/v4l2_device.h\n> @@ -30,6 +30,7 @@ public:\n> \tint setControls(ControlList *ctrls);\n> \n> \tconst std::string &deviceNode() const { return deviceNode_; }\n> +\tstd::string devicePath() const;\n> \n> protected:\n> \tV4L2Device(const std::string &deviceNode);\n> diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\n> index 56ea1ddda2c1425f..e55deabed46e30d4 100644\n> --- a/src/libcamera/v4l2_device.cpp\n> +++ b/src/libcamera/v4l2_device.cpp\n> @@ -9,12 +9,15 @@\n> \n> #include \n> #include \n> +#include \n> +#include \n> #include \n> #include \n> #include \n> #include \n> \n> #include \"libcamera/internal/log.h\"\n> +#include \"libcamera/internal/sysfs.h\"\n> #include \"libcamera/internal/utils.h\"\n> #include \"libcamera/internal/v4l2_controls.h\"\n> \n> @@ -350,6 +353,31 @@ int V4L2Device::setControls(ControlList *ctrls)\n> \treturn ret;\n> }\n> \n> +/**\n> + * \\brief Retrieve the device path in sysfs\n> + *\n> + * This function returns the sysfs path to the physical device backing the V4L2\n> + * device. The path is guaranteed to be an absolute path, without any symbolic\n> + * link.\n\n\"It includes the sysfs mount point prefix.\"\n\n> + *\n> + * \\return The device path in sysfs\n> + */\n> +std::string V4L2Device::devicePath() const\n> +{\n> +\tstd::string devicePath = sysfs::charDevPath(deviceNode_) + \"/device\";\n> +\n> +\tchar *realPath = realpath(devicePath.c_str(), nullptr);\n> +\tif (!realPath) {\n> +\t\tLOG(V4L2, Fatal) << \"Can not resolve path for \" << devicePath;\n\ns/path/device path/ ?\n\nReviewed-by: Laurent Pinchart \n\n> +\t\treturn {};\n> +\t}\n> +\n> +\tstd::string path{ realPath };\n> +\tfree(realPath);\n> +\n> +\treturn path;\n> +}\n> +\n> /**\n> * \\brief Perform an IOCTL system call on the device node\n> * \\param[in] request The IOCTL request code","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 718D8BD86F\n\tfor ;\n\tTue, 4 Aug 2020 18:19:45 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id E7AC86054A;\n\tTue, 4 Aug 2020 20:19:44 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 8076760545\n\tfor ;\n\tTue, 4 Aug 2020 20:19:43 +0200 (CEST)","from pendragon.ideasonboard.com (81-175-216-236.bb.dnainternet.fi\n\t[81.175.216.236])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id E41DA27B;\n\tTue, 4 Aug 2020 20:19:42 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"jLr/pZ/Q\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1596565183;\n\tbh=qThAPjg68PJRfHgpEQJM/geCtFjo+16ZSOZ8IbBq+Fo=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=jLr/pZ/QFcNj0C6MKH4cq+YLxSIBVCEwc2wTgh522U9oHoIphtyya/4kPZlbjOo1y\n\tesJTv7jSGluoyE+OBbqMa1TY09w74DWQ4FCFPZ5adPaoxCuKn+B4+qJbnRqoErECPR\n\tBlwuiPr9XJu69Z+p+FY5EUAQ4BWudn6Nb411+MCo=","Date":"Tue, 4 Aug 2020 21:19:30 +0300","From":"Laurent Pinchart ","To":"Niklas =?utf-8?q?S=C3=B6derlund?= ","Message-ID":"<20200804181930.GG6075@pendragon.ideasonboard.com>","References":"<20200804161358.1628962-1-niklas.soderlund@ragnatech.se>\n\t<20200804161358.1628962-4-niklas.soderlund@ragnatech.se>","MIME-Version":"1.0","Content-Disposition":"inline","In-Reply-To":"<20200804161358.1628962-4-niklas.soderlund@ragnatech.se>","Subject":"Re: [libcamera-devel] [PATCH v7 3/9] libcamera: v4l2_device: Add\n\tmethod to lookup device path","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","Cc":"libcamera-devel@lists.libcamera.org","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":11864,"web_url":"https://patchwork.libcamera.org/comment/11864/","msgid":"<20200805072540.23t344elbk54zazm@uno.localdomain>","date":"2020-08-05T07:25:40","subject":"Re: [libcamera-devel] [PATCH v7 3/9] libcamera: v4l2_device: Add\n\tmethod to lookup device path","submitter":{"id":3,"url":"https://patchwork.libcamera.org/api/people/3/","name":"Jacopo Mondi","email":"jacopo@jmondi.org"},"content":"Hi Niklas,\n\nOn Tue, Aug 04, 2020 at 06:13:52PM +0200, Niklas Söderlund wrote:\n> Add a method to lookup a V4L2 devices path in sysfs.\n>\n> Signed-off-by: Niklas Söderlund \n> ---\n> * Changes since v6\n> - Use sysfs:: helper.\n> - Do not try to return std::string { nullptr } on error.\n>\n> * Changes since v5\n> - Expand documentation\n> - Use DeviceEnumerator interface to lookup device path\n> - Include stdlib.h\n> - Use realpath(..., nullptr); ...; free();\n>\n> * Changes since v3\n> - s/the device path/the device path in sysfs/\n> ---\n> include/libcamera/internal/v4l2_device.h | 1 +\n> src/libcamera/v4l2_device.cpp | 28 ++++++++++++++++++++++++\n> 2 files changed, 29 insertions(+)\n>\n> diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\n> index bf643f2ec966bb33..3b605aab343b3b94 100644\n> --- a/include/libcamera/internal/v4l2_device.h\n> +++ b/include/libcamera/internal/v4l2_device.h\n> @@ -30,6 +30,7 @@ public:\n> \tint setControls(ControlList *ctrls);\n>\n> \tconst std::string &deviceNode() const { return deviceNode_; }\n> +\tstd::string devicePath() const;\n>\n> protected:\n> \tV4L2Device(const std::string &deviceNode);\n> diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\n> index 56ea1ddda2c1425f..e55deabed46e30d4 100644\n> --- a/src/libcamera/v4l2_device.cpp\n> +++ b/src/libcamera/v4l2_device.cpp\n> @@ -9,12 +9,15 @@\n>\n> #include \n> #include \n> +#include \n\nIs limits.h a leftover from when you used MAX_PATH ?\n\n> +#include \n> #include \n> #include \n> #include \n> #include \n>\n> #include \"libcamera/internal/log.h\"\n> +#include \"libcamera/internal/sysfs.h\"\n> #include \"libcamera/internal/utils.h\"\n> #include \"libcamera/internal/v4l2_controls.h\"\n>\n> @@ -350,6 +353,31 @@ int V4L2Device::setControls(ControlList *ctrls)\n> \treturn ret;\n> }\n>\n> +/**\n> + * \\brief Retrieve the device path in sysfs\n> + *\n> + * This function returns the sysfs path to the physical device backing the V4L2\n> + * device. The path is guaranteed to be an absolute path, without any symbolic\n> + * link.\n> + *\n> + * \\return The device path in sysfs\n> + */\n> +std::string V4L2Device::devicePath() const\n> +{\n> +\tstd::string devicePath = sysfs::charDevPath(deviceNode_) + \"/device\";\n> +\n> +\tchar *realPath = realpath(devicePath.c_str(), nullptr);\n> +\tif (!realPath) {\n> +\t\tLOG(V4L2, Fatal) << \"Can not resolve path for \" << devicePath;\n> +\t\treturn {};\n> +\t}\n> +\n> +\tstd::string path{ realPath };\n> +\tfree(realPath);\n> +\n> +\treturn path;\n> +}\n> +\n\nReviewed-by: Jacopo Mondi \n\nThanks\n j\n\n> /**\n> * \\brief Perform an IOCTL system call on the device node\n> * \\param[in] request The IOCTL request code\n> --\n> 2.28.0\n>\n> _______________________________________________\n> libcamera-devel mailing list\n> libcamera-devel@lists.libcamera.org\n> https://lists.libcamera.org/listinfo/libcamera-devel","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 68DEFBD86F\n\tfor ;\n\tWed, 5 Aug 2020 07:22:02 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0CED960554;\n\tWed, 5 Aug 2020 09:22:02 +0200 (CEST)","from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net\n\t[217.70.183.201])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2FCD260554\n\tfor ;\n\tWed, 5 Aug 2020 09:22:00 +0200 (CEST)","from uno.localdomain (93-34-118-233.ip49.fastwebnet.it\n\t[93.34.118.233]) (Authenticated sender: jacopo@jmondi.org)\n\tby relay8-d.mail.gandi.net (Postfix) with ESMTPSA id 976B41BF20E;\n\tWed, 5 Aug 2020 07:21:59 +0000 (UTC)"],"X-Originating-IP":"93.34.118.233","Date":"Wed, 5 Aug 2020 09:25:40 +0200","From":"Jacopo Mondi ","To":"Niklas =?utf-8?q?S=C3=B6derlund?= ","Message-ID":"<20200805072540.23t344elbk54zazm@uno.localdomain>","References":"<20200804161358.1628962-1-niklas.soderlund@ragnatech.se>\n\t<20200804161358.1628962-4-niklas.soderlund@ragnatech.se>","MIME-Version":"1.0","Content-Disposition":"inline","In-Reply-To":"<20200804161358.1628962-4-niklas.soderlund@ragnatech.se>","Subject":"Re: [libcamera-devel] [PATCH v7 3/9] libcamera: v4l2_device: Add\n\tmethod to lookup device path","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","Cc":"libcamera-devel@lists.libcamera.org","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":11870,"web_url":"https://patchwork.libcamera.org/comment/11870/","msgid":"<20200805090824.GA2712616@oden.dyn.berto.se>","date":"2020-08-05T09:08:24","subject":"Re: [libcamera-devel] [PATCH v7 3/9] libcamera: v4l2_device: Add\n\tmethod to lookup device path","submitter":{"id":5,"url":"https://patchwork.libcamera.org/api/people/5/","name":"Niklas Söderlund","email":"niklas.soderlund@ragnatech.se"},"content":"Hi Jacopo,\n\nThanks for your feedback.\n\nOn 2020-08-05 09:25:40 +0200, Jacopo Mondi wrote:\n> Hi Niklas,\n> \n> On Tue, Aug 04, 2020 at 06:13:52PM +0200, Niklas Söderlund wrote:\n> > Add a method to lookup a V4L2 devices path in sysfs.\n> >\n> > Signed-off-by: Niklas Söderlund \n> > ---\n> > * Changes since v6\n> > - Use sysfs:: helper.\n> > - Do not try to return std::string { nullptr } on error.\n> >\n> > * Changes since v5\n> > - Expand documentation\n> > - Use DeviceEnumerator interface to lookup device path\n> > - Include stdlib.h\n> > - Use realpath(..., nullptr); ...; free();\n> >\n> > * Changes since v3\n> > - s/the device path/the device path in sysfs/\n> > ---\n> > include/libcamera/internal/v4l2_device.h | 1 +\n> > src/libcamera/v4l2_device.cpp | 28 ++++++++++++++++++++++++\n> > 2 files changed, 29 insertions(+)\n> >\n> > diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h\n> > index bf643f2ec966bb33..3b605aab343b3b94 100644\n> > --- a/include/libcamera/internal/v4l2_device.h\n> > +++ b/include/libcamera/internal/v4l2_device.h\n> > @@ -30,6 +30,7 @@ public:\n> > \tint setControls(ControlList *ctrls);\n> >\n> > \tconst std::string &deviceNode() const { return deviceNode_; }\n> > +\tstd::string devicePath() const;\n> >\n> > protected:\n> > \tV4L2Device(const std::string &deviceNode);\n> > diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp\n> > index 56ea1ddda2c1425f..e55deabed46e30d4 100644\n> > --- a/src/libcamera/v4l2_device.cpp\n> > +++ b/src/libcamera/v4l2_device.cpp\n> > @@ -9,12 +9,15 @@\n> >\n> > #include \n> > #include \n> > +#include \n> \n> Is limits.h a leftover from when you used MAX_PATH ?\n\nNo, it's required for realpath();\n\n> \n> > +#include \n> > #include \n> > #include \n> > #include \n> > #include \n> >\n> > #include \"libcamera/internal/log.h\"\n> > +#include \"libcamera/internal/sysfs.h\"\n> > #include \"libcamera/internal/utils.h\"\n> > #include \"libcamera/internal/v4l2_controls.h\"\n> >\n> > @@ -350,6 +353,31 @@ int V4L2Device::setControls(ControlList *ctrls)\n> > \treturn ret;\n> > }\n> >\n> > +/**\n> > + * \\brief Retrieve the device path in sysfs\n> > + *\n> > + * This function returns the sysfs path to the physical device backing the V4L2\n> > + * device. The path is guaranteed to be an absolute path, without any symbolic\n> > + * link.\n> > + *\n> > + * \\return The device path in sysfs\n> > + */\n> > +std::string V4L2Device::devicePath() const\n> > +{\n> > +\tstd::string devicePath = sysfs::charDevPath(deviceNode_) + \"/device\";\n> > +\n> > +\tchar *realPath = realpath(devicePath.c_str(), nullptr);\n> > +\tif (!realPath) {\n> > +\t\tLOG(V4L2, Fatal) << \"Can not resolve path for \" << devicePath;\n> > +\t\treturn {};\n> > +\t}\n> > +\n> > +\tstd::string path{ realPath };\n> > +\tfree(realPath);\n> > +\n> > +\treturn path;\n> > +}\n> > +\n> \n> Reviewed-by: Jacopo Mondi \n> \n> Thanks\n> j\n> \n> > /**\n> > * \\brief Perform an IOCTL system call on the device node\n> > * \\param[in] request The IOCTL request code\n> > --\n> > 2.28.0\n> >\n> > _______________________________________________\n> > libcamera-devel mailing list\n> > libcamera-devel@lists.libcamera.org\n> > https://lists.libcamera.org/listinfo/libcamera-devel","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 4625DBD86F\n\tfor ;\n\tWed, 5 Aug 2020 09:08:44 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 28FBF60555;\n\tWed, 5 Aug 2020 11:08:28 +0200 (CEST)","from mail-lf1-x142.google.com (mail-lf1-x142.google.com\n\t[IPv6:2a00:1450:4864:20::142])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C346F60554\n\tfor ;\n\tWed, 5 Aug 2020 11:08:26 +0200 (CEST)","by mail-lf1-x142.google.com with SMTP id h8so23854744lfp.9\n\tfor ;\n\tWed, 05 Aug 2020 02:08:26 -0700 (PDT)","from localhost (h-209-203.A463.priv.bahnhof.se. 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