€•§HŒsphinx.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/userspace-api/gpio/gpio-v2-line-event-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ>/translations/zh_TW/userspace-api/gpio/gpio-v2-line-event-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ>/translations/it_IT/userspace-api/gpio/gpio-v2-line-event-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ>/translations/ja_JP/userspace-api/gpio/gpio-v2-line-event-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ>/translations/ko_KR/userspace-api/gpio/gpio-v2-line-event-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ>/translations/sp_SP/userspace-api/gpio/gpio-v2-line-event-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”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$]”h&]”Œ xml:space”Œpreserve”uh1h¡hhhžhhŸŒX/var/lib/git/docbuild/linux/Documentation/userspace-api/gpio/gpio-v2-line-event-read.rst”h KubhŒtarget”“”)”}”(hŒ.. _GPIO_V2_LINE_EVENT_READ:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œgpio-v2-line-event-read”uh1h´h KhhhžhhŸh³ubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒGPIO_V2_LINE_EVENT_READ”h]”hŒGPIO_V2_LINE_EVENT_READ”…””}”(hhÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhhÄhžhhŸh³h KubhÃ)”}”(hhh]”(hÈ)”}”(hŒName”h]”hŒName”…””}”(hhÚhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhh×hžhhŸh³h K ubhŒ paragraph”“”)”}”(hŒNGPIO_V2_LINE_EVENT_READ - Read edge detection events for lines from a request.”h]”hŒNGPIO_V2_LINE_EVENT_READ - Read edge detection events for lines from a request.”…””}”(hhêhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K hh×hžhubeh}”(h]”Œname”ah ]”h"]”Œname”ah$]”h&]”uh1hÂhhÄhžhhŸh³h K ubhÃ)”}”(hhh]”(hÈ)”}”(hŒSynopsis”h]”hŒSynopsis”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjhžhhŸh³h Kubhé)”}”(hŒ1``int read(int req_fd, void *buf, size_t count)``”h]”hŒliteral”“”)”}”(hjh]”hŒ-int read(int req_fd, void *buf, size_t count)”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h Khjhžhubeh}”(h]”Œsynopsis”ah ]”h"]”Œsynopsis”ah$]”h&]”uh1hÂhhÄhžhhŸh³h KubhÃ)”}”(hhh]”(hÈ)”}”(hŒ Arguments”h]”hŒ Arguments”…””}”(hj5hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj2hžhhŸh³h KubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒš``req_fd`` The file descriptor of the GPIO character device, as returned in the :c:type:`request.fd` by gpio-v2-get-line-ioctl.rst. ”h]”(hŒterm”“”)”}”(hŒ ``req_fd``”h]”j)”}”(hjRh]”hŒreq_fd”…””}”(hjThžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjPubah}”(h]”h ]”h"]”h$]”h&]”uh1jNhŸh³h KhjJubhŒ definition”“”)”}”(hhh]”hé)”}”(hŒŽThe file descriptor of the GPIO character device, as returned in the :c:type:`request.fd` by gpio-v2-get-line-ioctl.rst.”h]”(hŒEThe file descriptor of the GPIO character device, as returned in the ”…””}”(hjlhžhhŸNh Nubh)”}”(hŒ*:c:type:`request.fd`”h]”j)”}”(hjvh]”hŒ request.fd”…””}”(hjxhžhhŸNh Nubah}”(h]”h ]”(Œxref”Œc”Œc-type”eh"]”h$]”h&]”uh1jhjtubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œ*userspace-api/gpio/gpio-v2-line-event-read”Œ refdomain”jƒŒreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰Œ reftarget”Œgpio_v2_line_request”uh1hhŸh³h KhjlubhŒ by gpio-v2-get-line-ioctl.rst.”…””}”(hjlhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h Khjiubah}”(h]”h ]”h"]”h$]”h&]”uh1jghjJubeh}”(h]”h ]”h"]”h$]”h&]”uh1jHhŸh³h KhjEubjI)”}”(hŒH``buf`` The buffer to contain the :c:type:`events`. ”h]”(jO)”}”(hŒ``buf``”h]”j)”}”(hj³h]”hŒbuf”…””}”(hjµhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj±ubah}”(h]”h ]”h"]”h$]”h&]”uh1jNhŸh³h Khj­ubjh)”}”(hhh]”hé)”}”(hŒ?The buffer to contain the :c:type:`events`.”h]”(hŒThe buffer to contain the ”…””}”(hjËhžhhŸNh Nubh)”}”(hŒ$:c:type:`events`”h]”j)”}”(hjÕh]”hŒevents”…””}”(hj×hžhhŸNh Nubah}”(h]”h ]”(j‚jƒŒc-type”eh"]”h$]”h&]”uh1jhjÓubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jƒŒreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰j•Œgpio_v2_line_event”uh1hhŸh³h KhjËubhŒ.”…””}”(hjËhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KhjÈubah}”(h]”h ]”h"]”h$]”h&]”uh1jghj­ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jHhŸh³h KhjEhžhubjI)”}”(hŒw``count`` The number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpio_v2_line_event`. ”h]”(jO)”}”(hŒ ``count``”h]”j)”}”(hjh]”hŒcount”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj ubah}”(h]”h ]”h"]”h$]”h&]”uh1jNhŸh³h Khjubjh)”}”(hhh]”hé)”}”(hŒlThe number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpio_v2_line_event`.”h]”(hŒ!The number of bytes available in ”…””}”(hj&hžhhŸNh Nubj)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hj.hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj&ubhŒ', which must be at least the size of a ”…””}”(hj&hžhhŸNh Nubh)”}”(hŒ:c:type:`gpio_v2_line_event`”h]”j)”}”(hjBh]”hŒgpio_v2_line_event”…””}”(hjDhžhhŸNh Nubah}”(h]”h ]”(j‚jƒŒc-type”eh"]”h$]”h&]”uh1jhj@ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jƒŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰j•Œgpio_v2_line_event”uh1hhŸh³h Khj&ubhŒ.”…””}”(hj&hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h Khj#ubah}”(h]”h ]”h"]”h$]”h&]”uh1jghjubeh}”(h]”h ]”h"]”h$]”h&]”uh1jHhŸh³h KhjEhžhubeh}”(h]”h ]”h"]”h$]”h&]”uh1jChj2hžhhŸh³h Nubeh}”(h]”Œ arguments”ah ]”h"]”Œ arguments”ah$]”h&]”uh1hÂhhÄhžhhŸh³h KubhÃ)”}”(hhh]”(hÈ)”}”(hŒ Description”h]”hŒ Description”…””}”(hj†hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjƒhžhhŸh³h K"ubhé)”}”(hŒ4Read edge detection events for lines from a request.”h]”hŒ4Read edge detection events for lines from a request.”…””}”(hj”hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K$hjƒhžhubhé)”}”(hŒèEdge detection must be enabled for the input line using either ``GPIO_V2_LINE_FLAG_EDGE_RISING`` or ``GPIO_V2_LINE_FLAG_EDGE_FALLING``, or both. Edge events are then generated whenever edge interrupts are detected on the input line.”h]”(hŒ?Edge detection must be enabled for the input line using either ”…””}”(hj¢hžhhŸNh Nubj)”}”(hŒ!``GPIO_V2_LINE_FLAG_EDGE_RISING``”h]”hŒGPIO_V2_LINE_FLAG_EDGE_RISING”…””}”(hjªhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¢ubhŒ or ”…””}”(hj¢hžhhŸNh Nubj)”}”(hŒ"``GPIO_V2_LINE_FLAG_EDGE_FALLING``”h]”hŒGPIO_V2_LINE_FLAG_EDGE_FALLING”…””}”(hj¼hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¢ubhŒb, or both. Edge events are then generated whenever edge interrupts are detected on the input line.”…””}”(hj¢hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K&hjƒhžhubhé)”}”(hX1Edges are defined in terms of changes to the logical line value, so an inactive to active transition is a rising edge. If ``GPIO_V2_LINE_FLAG_ACTIVE_LOW`` is set then logical polarity is the opposite of physical polarity, and ``GPIO_V2_LINE_FLAG_EDGE_RISING`` then corresponds to a falling physical edge.”h]”(hŒ{Edges are defined in terms of changes to the logical line value, so an inactive to active transition is a rising edge. If ”…””}”(hjÔhžhhŸNh Nubj)”}”(hŒ ``GPIO_V2_LINE_FLAG_ACTIVE_LOW``”h]”hŒGPIO_V2_LINE_FLAG_ACTIVE_LOW”…””}”(hjÜhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjÔubhŒH is set then logical polarity is the opposite of physical polarity, and ”…””}”(hjÔhžhhŸNh Nubj)”}”(hŒ!``GPIO_V2_LINE_FLAG_EDGE_RISING``”h]”hŒGPIO_V2_LINE_FLAG_EDGE_RISING”…””}”(hjîhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjÔubhŒ- then corresponds to a falling physical edge.”…””}”(hjÔhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K+hjƒhžhubhé)”}”(hŒ¿The kernel captures and timestamps edge events as close as possible to their occurrence and stores them in a buffer from where they can be read by userspace at its convenience using `read()`.”h]”(hŒ¶The kernel captures and timestamps edge events as close as possible to their occurrence and stores them in a buffer from where they can be read by userspace at its convenience using ”…””}”(hjhžhhŸNh NubhŒtitle_reference”“”)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubhŒ.”…””}”(hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K0hjƒhžhubhé)”}”(hŒ¥Events read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one request.”h]”hŒ¥Events read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one request.”…””}”(hj(hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K4hjƒhžhubhé)”}”(hŒæThe size of the kernel event buffer is fixed at the time of line request creation, and can be influenced by the :c:type:`request.event_buffer_size`. The default size is 16 times the number of lines requested.”h]”(hŒpThe size of the kernel event buffer is fixed at the time of line request creation, and can be influenced by the ”…””}”(hj6hžhhŸNh Nubh)”}”(hŒ9:c:type:`request.event_buffer_size`”h]”j)”}”(hj@h]”hŒrequest.event_buffer_size”…””}”(hjBhžhhŸNh Nubah}”(h]”h ]”(j‚jƒŒc-type”eh"]”h$]”h&]”uh1jhj>ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jƒŒreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰j•Œgpio_v2_line_request”uh1hhŸh³h K8hj6ubhŒ=. The default size is 16 times the number of lines requested.”…””}”(hj6hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K8hjƒhžhubhé)”}”(hŒïThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the oldest buffered event is discarded. Overflow can be detected from userspace by monitoring the event sequence numbers.”h]”hŒïThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the oldest buffered event is discarded. Overflow can be detected from userspace by monitoring the event sequence numbers.”…””}”(hjghžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K=hjƒhžhubhé)”}”(hXTo minimize the number of calls required to copy events from the kernel to userspace, `read()` supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (``buf``).”h]”(hŒVTo minimize the number of calls required to copy events from the kernel to userspace, ”…””}”(hjuhžhhŸNh Nubj)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj}hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjuubhŒ¯ supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (”…””}”(hjuhžhhŸNh Nubj)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjuubhŒ).”…””}”(hjuhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KBhjƒhžhubhé)”}”(hŒœChanging the edge detection flags using gpio-v2-line-set-config-ioctl.rst does not remove or modify the events already contained in the kernel event buffer.”h]”hŒœChanging the edge detection flags using gpio-v2-line-set-config-ioctl.rst does not remove or modify the events already contained in the kernel event buffer.”…””}”(hj§hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KGhjƒhžhubhé)”}”(hŒdThe `read()` will block if no event is available and the ``req_fd`` has not been set **O_NONBLOCK**.”h]”(hŒThe ”…””}”(hjµhžhhŸNh Nubj)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj½hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjµubhŒ- will block if no event is available and the ”…””}”(hjµhžhhŸNh Nubj)”}”(hŒ ``req_fd``”h]”hŒreq_fd”…””}”(hjÏhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjµubhŒ has not been set ”…””}”(hjµhžhhŸNh NubhŒstrong”“”)”}”(hŒ**O_NONBLOCK**”h]”hŒ O_NONBLOCK”…””}”(hjãhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jáhjµubhŒ.”…””}”(hjµhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KKhjƒhžhubhé)”}”(hŒwThe presence of an event can be tested for by checking that the ``req_fd`` is readable using `poll()` or an equivalent.”h]”(hŒ@The presence of an event can be tested for by checking that the ”…””}”(hjûhžhhŸNh Nubj)”}”(hŒ ``req_fd``”h]”hŒreq_fd”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjûubhŒ is readable using ”…””}”(hjûhžhhŸNh Nubj)”}”(hŒ`poll()`”h]”hŒpoll()”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjûubhŒ or an equivalent.”…””}”(hjûhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KNhjƒhžhubeh}”(h]”Œ description”ah ]”h"]”Œ description”ah$]”h&]”uh1hÂhhÄhžhhŸh³h K"ubhÃ)”}”(hhh]”(hÈ)”}”(hŒ Return Value”h]”hŒ Return Value”…””}”(hj8hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj5hžhhŸh³h KRubhé)”}”(hŒrOn success the number of bytes read, which will be a multiple of the size of a :c:type:`gpio_v2_line_event` event.”h]”(hŒOOn success the number of bytes read, which will be a multiple of the size of a ”…””}”(hjFhžhhŸNh Nubh)”}”(hŒ:c:type:`gpio_v2_line_event`”h]”j)”}”(hjPh]”hŒgpio_v2_line_event”…””}”(hjRhžhhŸNh Nubah}”(h]”h ]”(j‚jƒŒc-type”eh"]”h$]”h&]”uh1jhjNubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jƒŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰j•Œgpio_v2_line_event”uh1hhŸh³h KThjFubhŒ event.”…””}”(hjFhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KThj5hžhubhé)”}”(hŒqOn error -1 and the ``errno`` variable is set appropriately. Common error codes are described in error-codes.rst.”h]”(hŒOn error -1 and the ”…””}”(hjwhžhhŸNh Nubj)”}”(hŒ ``errno``”h]”hŒerrno”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjwubhŒT variable is set appropriately. 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