€•dOŒsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ(/translations/zh_CN/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ(/translations/zh_TW/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ(/translations/it_IT/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ(/translations/ja_JP/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ(/translations/ko_KR/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ(/translations/pt_BR/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ(/translations/sp_SP/admin-guide/binderfs”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh·sbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1hµhhh²hh³ŒB/var/lib/git/docbuild/linux/Documentation/admin-guide/binderfs.rst”h´KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒThe Android binderfs Filesystem”h]”hŒThe Android binderfs Filesystem”…””}”(hhÏh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhÊh²hh³hÇh´KubhŒ paragraph”“”)”}”(hX`Android binderfs is a filesystem for the Android binder IPC mechanism. It allows to dynamically add and remove binder devices at runtime. Binder devices located in a new binderfs instance are independent of binder devices located in other binderfs instances. Mounting a new binderfs instance makes it possible to get a set of private binder devices.”h]”hX`Android binderfs is a filesystem for the Android binder IPC mechanism. It allows to dynamically add and remove binder devices at runtime. Binder devices located in a new binderfs instance are independent of binder devices located in other binderfs instances. Mounting a new binderfs instance makes it possible to get a set of private binder devices.”…””}”(hhßh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´KhhÊh²hubhÉ)”}”(hhh]”(hÎ)”}”(hŒMounting binderfs”h]”hŒMounting binderfs”…””}”(hhðh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhíh²hh³hÇh´K ubhÞ)”}”(hŒ&Android binderfs can be mounted with::”h]”hŒ%Android binderfs can be mounted with:”…””}”(hhþh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khhíh²hubhŒ literal_block”“”)”}”(hŒ8mkdir /dev/binderfs mount -t binder binder /dev/binderfs”h]”hŒ8mkdir /dev/binderfs mount -t binder binder /dev/binderfs”…””}”hjsbah}”(h]”h ]”h"]”h$]”h&]”hÅhÆuh1j h³hÇh´Khhíh²hubhÞ)”}”(hXüat which point a new instance of binderfs will show up at ``/dev/binderfs``. In a fresh instance of binderfs no binder devices will be present. There will only be a ``binder-control`` device which serves as the request handler for binderfs. Mounting another binderfs instance at a different location will create a new and separate instance from all other binderfs mounts. This is identical to the behavior of e.g. ``devpts`` and ``tmpfs``. The Android binderfs filesystem can be mounted in user namespaces.”h]”(hŒ:at which point a new instance of binderfs will show up at ”…””}”(hjh²hh³Nh´NubhŒliteral”“”)”}”(hŒ``/dev/binderfs``”h]”hŒ /dev/binderfs”…””}”(hj&h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒ[. In a fresh instance of binderfs no binder devices will be present. There will only be a ”…””}”(hjh²hh³Nh´Nubj%)”}”(hŒ``binder-control``”h]”hŒbinder-control”…””}”(hj8h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒè device which serves as the request handler for binderfs. Mounting another binderfs instance at a different location will create a new and separate instance from all other binderfs mounts. This is identical to the behavior of e.g. ”…””}”(hjh²hh³Nh´Nubj%)”}”(hŒ ``devpts``”h]”hŒdevpts”…””}”(hjJh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒ and ”…””}”(hjh²hh³Nh´Nubj%)”}”(hŒ ``tmpfs``”h]”hŒtmpfs”…””}”(hj\h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒD. The Android binderfs filesystem can be mounted in user namespaces.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khhíh²hubeh}”(h]”Œmounting-binderfs”ah ]”h"]”Œmounting binderfs”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´K ubhÉ)”}”(hhh]”(hÎ)”}”(hŒOptions”h]”hŒOptions”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhj|h²hh³hÇh´KubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hX max binderfs instances can be mounted with a limit on the number of binder devices that can be allocated. The ``max=`` mount option serves as a per-instance limit. If ``max=`` is set then only ```` number of binder devices can be allocated in this binderfs instance. ”h]”(hŒterm”“”)”}”(hŒmax”h]”hŒmax”…””}”(hjšh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j˜h³hÇh´K"hj”ubhŒ definition”“”)”}”(hhh]”hÞ)”}”(hXbinderfs instances can be mounted with a limit on the number of binder devices that can be allocated. The ``max=`` mount option serves as a per-instance limit. If ``max=`` is set then only ```` number of binder devices can be allocated in this binderfs instance.”h]”(hŒjbinderfs instances can be mounted with a limit on the number of binder devices that can be allocated. The ”…””}”(hj­h²hh³Nh´Nubj%)”}”(hŒ``max=``”h]”hŒ max=”…””}”(hjµh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj­ubhŒ1 mount option serves as a per-instance limit. If ”…””}”(hj­h²hh³Nh´Nubj%)”}”(hŒ``max=``”h]”hŒ max=”…””}”(hjÇh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj­ubhŒ is set then only ”…””}”(hj­h²hh³Nh´Nubj%)”}”(hŒ ````”h]”hŒ”…””}”(hjÙh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj­ubhŒE number of binder devices can be allocated in this binderfs instance.”…””}”(hj­h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khjªubah}”(h]”h ]”h"]”h$]”h&]”uh1j¨hj”ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j’h³hÇh´K"hjubj“)”}”(hXstats Using ``stats=global`` enables global binder statistics. ``stats=global`` is only available for a binderfs instance mounted in the initial user namespace. An attempt to use the option to mount a binderfs instance in another user namespace will return a permission error. ”h]”(j™)”}”(hŒstats”h]”hŒstats”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j˜h³hÇh´K(hjýubj©)”}”(hhh]”hÞ)”}”(hXUsing ``stats=global`` enables global binder statistics. ``stats=global`` is only available for a binderfs instance mounted in the initial user namespace. An attempt to use the option to mount a binderfs instance in another user namespace will return a permission error.”h]”(hŒUsing ”…””}”(hjh²hh³Nh´Nubj%)”}”(hŒ``stats=global``”h]”hŒ stats=global”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒ# enables global binder statistics. ”…””}”(hjh²hh³Nh´Nubj%)”}”(hŒ``stats=global``”h]”hŒ stats=global”…””}”(hj,h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒÅ is only available for a binderfs instance mounted in the initial user namespace. An attempt to use the option to mount a binderfs instance in another user namespace will return a permission error.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K%hjubah}”(h]”h ]”h"]”h$]”h&]”uh1j¨hjýubeh}”(h]”h ]”h"]”h$]”h&]”uh1j’h³hÇh´K(hjh²hubeh}”(h]”h ]”h"]”h$]”h&]”uh1jhj|h²hh³hÇh´Nubeh}”(h]”Œoptions”ah ]”h"]”Œoptions”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´KubhÉ)”}”(hhh]”(hÎ)”}”(hŒAllocating binder Devices”h]”hŒAllocating binder Devices”…””}”(hjah²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhj^h²hh³hÇh´K+ubhŒtarget”“”)”}”(hŒ<.. _ioctl: http://man7.org/linux/man-pages/man2/ioctl.2.html”h]”h}”(h]”Œioctl”ah ]”h"]”Œioctl”ah$]”h&]”Œrefuri”Œ1http://man7.org/linux/man-pages/man2/ioctl.2.html”uh1joh´K-hj^h²hh³hÇŒ referenced”KubhÞ)”}”(hŒ·To allocate a new binder device in a binderfs instance a request needs to be sent through the ``binder-control`` device node. A request is sent in the form of an `ioctl() `_.”h]”(hŒ^To allocate a new binder device in a binderfs instance a request needs to be sent through the ”…””}”(hj€h²hh³Nh´Nubj%)”}”(hŒ``binder-control``”h]”hŒbinder-control”…””}”(hjˆh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj€ubhŒ3 device node. A request is sent in the form of an ”…””}”(hj€h²hh³Nh´NubhŒ reference”“”)”}”(hŒ`ioctl() `_”h]”hŒioctl()”…””}”(hjœh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œioctl()”j}j~uh1jšhj€Œresolved”Kubjp)”}”(hŒ ”h]”h}”(h]”h ]”h"]”Œioctl()”ah$]”h&]”j}j~uh1joŒindirect_reference_name”Œioctl”hj€j¬KubhŒ.”…””}”(hj€h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K/hj^h²hubhÞ)”}”(hX@What a program needs to do is to open the ``binder-control`` device node and send a ``BINDER_CTL_ADD`` request to the kernel. Users of binderfs need to tell the kernel which name the new binder device should get. By default a name can only contain up to ``BINDERFS_MAX_NAME`` chars including the terminating zero byte.”h]”(hŒ*What a program needs to do is to open the ”…””}”(hjÄh²hh³Nh´Nubj%)”}”(hŒ``binder-control``”h]”hŒbinder-control”…””}”(hjÌh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjÄubhŒ device node and send a ”…””}”(hjÄh²hh³Nh´Nubj%)”}”(hŒ``BINDER_CTL_ADD``”h]”hŒBINDER_CTL_ADD”…””}”(hjÞh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjÄubhŒš request to the kernel. Users of binderfs need to tell the kernel which name the new binder device should get. By default a name can only contain up to ”…””}”(hjÄh²hh³Nh´Nubj%)”}”(hŒ``BINDERFS_MAX_NAME``”h]”hŒBINDERFS_MAX_NAME”…””}”(hjðh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjÄubhŒ+ chars including the terminating zero byte.”…””}”(hjÄh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K3hj^h²hubhÞ)”}”(hX«Once the request is made via an `ioctl() `_ passing a ``struct binder_device`` with the name to the kernel it will allocate a new binder device and return the major and minor number of the new device in the struct (This is necessary because binderfs allocates a major device number dynamically.). After the `ioctl() `_ returns there will be a new binder device located under /dev/binderfs with the chosen name.”h]”(hŒ Once the request is made via an ”…””}”(hjh²hh³Nh´Nubj›)”}”(hŒ`ioctl() `_”h]”hŒioctl()”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œioctl()”j}j~uh1jšhjj¬Kubjp)”}”(hŒ ”h]”h}”(h]”h ]”h"]”Œioctl()”ah$]”h&]”j}j~uh1joj¸Œioctl”hjj¬KubhŒ passing a ”…””}”(hjh²hh³Nh´Nubj%)”}”(hŒ``struct binder_device``”h]”hŒstruct binder_device”…””}”(hj0h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hjubhŒæ with the name to the kernel it will allocate a new binder device and return the major and minor number of the new device in the struct (This is necessary because binderfs allocates a major device number dynamically.). After the ”…””}”(hjh²hh³Nh´Nubj›)”}”(hŒ`ioctl() `_”h]”hŒioctl()”…””}”(hjBh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œioctl()”j}j~uh1jšhjj¬Kubjp)”}”(hŒ ”h]”h}”(h]”h ]”h"]”Œioctl()”ah$]”h&]”j}j~uh1joj¸Œioctl”hjj¬KubhŒ\ returns there will be a new binder device located under /dev/binderfs with the chosen name.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K9hj^h²hubeh}”(h]”Œallocating-binder-devices”ah ]”h"]”Œallocating binder devices”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´K+ubhÉ)”}”(hhh]”(hÎ)”}”(hŒDeleting binder Devices”h]”hŒDeleting binder Devices”…””}”(hjsh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhjph²hh³hÇh´KAubjp)”}”(hŒ>.. _unlink: http://man7.org/linux/man-pages/man2/unlink.2.html”h]”h}”(h]”Œunlink”ah ]”h"]”Œunlink”ah$]”h&]”j}Œ2http://man7.org/linux/man-pages/man2/unlink.2.html”uh1joh´KChjph²hh³hÇjKubjp)”}”(hŒ6.. _rm: http://man7.org/linux/man-pages/man1/rm.1.html”h]”h}”(h]”Œrm”ah ]”h"]”Œrm”ah$]”h&]”j}Œ.http://man7.org/linux/man-pages/man1/rm.1.html”uh1joh´KDhjph²hh³hÇjKubhÞ)”}”(hXxBinderfs binder devices can be deleted via `unlink() `_. This means that the `rm() `_ tool can be used to delete them. Note that the ``binder-control`` device cannot be deleted since this would make the binderfs instance unusable. The ``binder-control`` device will be deleted when the binderfs instance is unmounted and all references to it have been dropped.”h]”(hŒ+Binderfs binder devices can be deleted via ”…””}”(hj›h²hh³Nh´Nubj›)”}”(hŒ`unlink() `_”h]”hŒunlink()”…””}”(hj£h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œunlink()”j}juh1jšhj›j¬Kubjp)”}”(hŒ ”h]”h}”(h]”h ]”h"]”Œunlink()”ah$]”h&]”j}juh1joj¸Œunlink”hj›j¬KubhŒ. This means that the ”…””}”(hj›h²hh³Nh´Nubj›)”}”(hŒ `rm() `_”h]”hŒrm()”…””}”(hjÃh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œrm()”j}jšuh1jšhj›j¬Kubjp)”}”(hŒ ”h]”h}”(h]”h ]”h"]”Œrm()”ah$]”h&]”j}jšuh1joj¸Œrm”hj›j¬KubhŒ0 tool can be used to delete them. Note that the ”…””}”(hj›h²hh³Nh´Nubj%)”}”(hŒ``binder-control``”h]”hŒbinder-control”…””}”(hjãh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj›ubhŒU device cannot be deleted since this would make the binderfs instance unusable. The ”…””}”(hj›h²hh³Nh´Nubj%)”}”(hŒ``binder-control``”h]”hŒbinder-control”…””}”(hjõh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj›ubhŒk device will be deleted when the binderfs instance is unmounted and all references to it have been dropped.”…””}”(hj›h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´KFhjph²hubeh}”(h]”Œdeleting-binder-devices”ah ]”h"]”Œdeleting binder devices”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´KAubhÉ)”}”(hhh]”(hÎ)”}”(hŒBinder features”h]”hŒBinder features”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhjh²hh³hÇh´KMubhÞ)”}”(hXAssuming an instance of binderfs has been mounted at ``/dev/binderfs``, the features supported by the binder driver can be located under ``/dev/binderfs/features/``. The presence of individual files can be tested to determine whether a particular feature is supported by the driver.”h]”(hŒ5Assuming an instance of binderfs has been mounted at ”…””}”(hj&h²hh³Nh´Nubj%)”}”(hŒ``/dev/binderfs``”h]”hŒ /dev/binderfs”…””}”(hj.h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj&ubhŒC, the features supported by the binder driver can be located under ”…””}”(hj&h²hh³Nh´Nubj%)”}”(hŒ``/dev/binderfs/features/``”h]”hŒ/dev/binderfs/features/”…””}”(hj@h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j$hj&ubhŒv. 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