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Read edge detection events for lines from a request.”h]”hŒNGPIO_V2_LINE_EVENT_READ - Read edge detection events for lines from a request.”…””}”(hhþh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K hhëh²hubeh}”(h]”Œname”ah ]”h"]”Œname”ah$]”h&]”uh1hÖhhØh²hh³hÇh´K ubh×)”}”(hhh]”(hÜ)”}”(hŒSynopsis”h]”hŒSynopsis”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjh²hh³hÇh´Kubhý)”}”(hŒ1``int read(int req_fd, void *buf, size_t count)``”h]”hŒliteral”“”)”}”(hj'h]”hŒ-int read(int req_fd, void *buf, size_t count)”…””}”(hj+h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj%ubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´Khjh²hubeh}”(h]”Œsynopsis”ah ]”h"]”Œsynopsis”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒ Arguments”h]”hŒ Arguments”…””}”(hjIh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjFh²hh³hÇh´KubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒš``req_fd`` The file descriptor of the GPIO character device, as returned in the :c:type:`request.fd` by gpio-v2-get-line-ioctl.rst. ”h]”(hŒterm”“”)”}”(hŒ ``req_fd``”h]”j*)”}”(hjfh]”hŒreq_fd”…””}”(hjhh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hjdubah}”(h]”h ]”h"]”h$]”h&]”uh1jbh³hÇh´Khj^ubhŒ definition”“”)”}”(hhh]”hý)”}”(hŒŽThe file descriptor of the GPIO character device, as returned in the :c:type:`request.fd` by gpio-v2-get-line-ioctl.rst.”h]”(hŒEThe file descriptor of the GPIO character device, as returned in the ”…””}”(hj€h²hh³Nh´Nubh)”}”(hŒ*:c:type:`request.fd`”h]”j*)”}”(hjŠh]”hŒ request.fd”…””}”(hjŒh²hh³Nh´Nubah}”(h]”h ]”(Œxref”Œc”Œc-type”eh"]”h$]”h&]”uh1j)hjˆubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œ*userspace-api/gpio/gpio-v2-line-event-read”Œ refdomain”j—Œreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰Œ reftarget”Œgpio_v2_line_request”uh1hh³hÇh´Khj€ubhŒ by gpio-v2-get-line-ioctl.rst.”…””}”(hj€h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´Khj}ubah}”(h]”h ]”h"]”h$]”h&]”uh1j{hj^ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j\h³hÇh´KhjYubj])”}”(hŒH``buf`` The buffer to contain the :c:type:`events`. ”h]”(jc)”}”(hŒ``buf``”h]”j*)”}”(hjÇh]”hŒbuf”…””}”(hjÉh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hjÅubah}”(h]”h ]”h"]”h$]”h&]”uh1jbh³hÇh´KhjÁubj|)”}”(hhh]”hý)”}”(hŒ?The buffer to contain the :c:type:`events`.”h]”(hŒThe buffer to contain the ”…””}”(hjßh²hh³Nh´Nubh)”}”(hŒ$:c:type:`events`”h]”j*)”}”(hjéh]”hŒevents”…””}”(hjëh²hh³Nh´Nubah}”(h]”h ]”(j–j—Œc-type”eh"]”h$]”h&]”uh1j)hjçubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j£Œ refdomain”j—Œreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰j©Œgpio_v2_line_event”uh1hh³hÇh´KhjßubhŒ.”…””}”(hjßh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´KhjÜubah}”(h]”h ]”h"]”h$]”h&]”uh1j{hjÁubeh}”(h]”h ]”h"]”h$]”h&]”uh1j\h³hÇh´KhjYh²hubj])”}”(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]”(jc)”}”(hŒ ``count``”h]”j*)”}”(hj"h]”hŒcount”…””}”(hj$h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj ubah}”(h]”h ]”h"]”h$]”h&]”uh1jbh³hÇh´Khjubj|)”}”(hhh]”hý)”}”(hŒlThe number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpio_v2_line_event`.”h]”(hŒ!The number of bytes available in ”…””}”(hj:h²hh³Nh´Nubj*)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hjBh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj:ubhŒ', which must be at least the size of a ”…””}”(hj:h²hh³Nh´Nubh)”}”(hŒ:c:type:`gpio_v2_line_event`”h]”j*)”}”(hjVh]”hŒgpio_v2_line_event”…””}”(hjXh²hh³Nh´Nubah}”(h]”h ]”(j–j—Œc-type”eh"]”h$]”h&]”uh1j)hjTubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j£Œ refdomain”j—Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰j©Œgpio_v2_line_event”uh1hh³hÇh´Khj:ubhŒ.”…””}”(hj:h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´Khj7ubah}”(h]”h ]”h"]”h$]”h&]”uh1j{hjubeh}”(h]”h ]”h"]”h$]”h&]”uh1j\h³hÇh´KhjYh²hubeh}”(h]”h ]”h"]”h$]”h&]”uh1jWhjFh²hh³hÇh´Nubeh}”(h]”Œ arguments”ah ]”h"]”Œ arguments”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒ Description”h]”hŒ Description”…””}”(hjšh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj—h²hh³hÇh´K"ubhý)”}”(hŒ4Read edge detection events for lines from a request.”h]”hŒ4Read edge detection events for lines from a request.”…””}”(hj¨h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K$hj—h²hubhý)”}”(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¶h²hh³Nh´Nubj*)”}”(hŒ!``GPIO_V2_LINE_FLAG_EDGE_RISING``”h]”hŒGPIO_V2_LINE_FLAG_EDGE_RISING”…””}”(hj¾h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj¶ubhŒ or ”…””}”(hj¶h²hh³Nh´Nubj*)”}”(hŒ"``GPIO_V2_LINE_FLAG_EDGE_FALLING``”h]”hŒGPIO_V2_LINE_FLAG_EDGE_FALLING”…””}”(hjÐh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj¶ubhŒb, or both. Edge events are then generated whenever edge interrupts are detected on the input line.”…””}”(hj¶h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K&hj—h²hubhý)”}”(hX1Edges are defined in terms of changes to the logical line value, so an inactive to active transition is a rising edge. If ``GPIO_V2_LINE_FLAG_ACTIVE_LOW`` is set then logical polarity is the opposite of physical polarity, and ``GPIO_V2_LINE_FLAG_EDGE_RISING`` then corresponds to a falling physical edge.”h]”(hŒ{Edges are defined in terms of changes to the logical line value, so an inactive to active transition is a rising edge. If ”…””}”(hjèh²hh³Nh´Nubj*)”}”(hŒ ``GPIO_V2_LINE_FLAG_ACTIVE_LOW``”h]”hŒGPIO_V2_LINE_FLAG_ACTIVE_LOW”…””}”(hjðh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hjèubhŒH is set then logical polarity is the opposite of physical polarity, and ”…””}”(hjèh²hh³Nh´Nubj*)”}”(hŒ!``GPIO_V2_LINE_FLAG_EDGE_RISING``”h]”hŒGPIO_V2_LINE_FLAG_EDGE_RISING”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hjèubhŒ- then corresponds to a falling physical edge.”…””}”(hjèh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K+hj—h²hubhý)”}”(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 ”…””}”(hjh²hh³Nh´NubhŒtitle_reference”“”)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj$h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j"hjubhŒ.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K0hj—h²hubhý)”}”(hŒ¥Events read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one request.”h]”hŒ¥Events read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one request.”…””}”(hj<h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K4hj—h²hubhý)”}”(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 ”…””}”(hjJh²hh³Nh´Nubh)”}”(hŒ9:c:type:`request.event_buffer_size`”h]”j*)”}”(hjTh]”hŒrequest.event_buffer_size”…””}”(hjVh²hh³Nh´Nubah}”(h]”h ]”(j–j—Œc-type”eh"]”h$]”h&]”uh1j)hjRubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j£Œ refdomain”j—Œreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰j©Œgpio_v2_line_request”uh1hh³hÇh´K8hjJubhŒ=. The default size is 16 times the number of lines requested.”…””}”(hjJh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K8hj—h²hubhý)”}”(hŒïThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the oldest buffered event is discarded. Overflow can be detected from userspace by monitoring the event sequence numbers.”h]”hŒïThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the oldest buffered event is discarded. Overflow can be detected from userspace by monitoring the event sequence numbers.”…””}”(hj{h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K=hj—h²hubhý)”}”(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, ”…””}”(hj‰h²hh³Nh´Nubj#)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj‘h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j"hj‰ubhŒ¯ supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (”…””}”(hj‰h²hh³Nh´Nubj*)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hj£h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj‰ubhŒ).”…””}”(hj‰h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´KBhj—h²hubhý)”}”(hŒœChanging the edge detection flags using gpio-v2-line-set-config-ioctl.rst does not remove or modify the events already contained in the kernel event buffer.”h]”hŒœChanging the edge detection flags using gpio-v2-line-set-config-ioctl.rst does not remove or modify the events already contained in the kernel event buffer.”…””}”(hj»h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´KGhj—h²hubhý)”}”(hŒdThe `read()` will block if no event is available and the ``req_fd`` has not been set **O_NONBLOCK**.”h]”(hŒThe ”…””}”(hjÉh²hh³Nh´Nubj#)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjÑh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j"hjÉubhŒ- will block if no event is available and the ”…””}”(hjÉh²hh³Nh´Nubj*)”}”(hŒ ``req_fd``”h]”hŒreq_fd”…””}”(hjãh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hjÉubhŒ has not been set ”…””}”(hjÉh²hh³Nh´NubhŒstrong”“”)”}”(hŒ**O_NONBLOCK**”h]”hŒ O_NONBLOCK”…””}”(hj÷h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jõhjÉubhŒ.”…””}”(hjÉh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´KKhj—h²hubhý)”}”(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 ”…””}”(hjh²hh³Nh´Nubj*)”}”(hŒ ``req_fd``”h]”hŒreq_fd”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hjubhŒ is readable using ”…””}”(hjh²hh³Nh´Nubj#)”}”(hŒ`poll()`”h]”hŒpoll()”…””}”(hj)h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j"hjubhŒ or an equivalent.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´KNhj—h²hubeh}”(h]”Œ description”ah ]”h"]”Œ description”ah$]”h&]”uh1hÖhhØh²hh³hÇh´K"ubh×)”}”(hhh]”(hÜ)”}”(hŒ Return Value”h]”hŒ Return Value”…””}”(hjLh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjIh²hh³hÇh´KRubhý)”}”(hŒrOn success the number of bytes read, which will be a multiple of the size of a :c:type:`gpio_v2_line_event` event.”h]”(hŒOOn success the number of bytes read, which will be a multiple of the size of a ”…””}”(hjZh²hh³Nh´Nubh)”}”(hŒ:c:type:`gpio_v2_line_event`”h]”j*)”}”(hjdh]”hŒgpio_v2_line_event”…””}”(hjfh²hh³Nh´Nubah}”(h]”h ]”(j–j—Œc-type”eh"]”h$]”h&]”uh1j)hjbubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j£Œ refdomain”j—Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰j©Œgpio_v2_line_event”uh1hh³hÇh´KThjZubhŒ event.”…””}”(hjZh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´KThjIh²hubhý)”}”(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 ”…””}”(hj‹h²hh³Nh´Nubj*)”}”(hŒ ``errno``”h]”hŒerrno”…””}”(hj“h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j)hj‹ubhŒT variable is set appropriately. 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