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Read line info change events for watched lines from the chip.”h]”hŒZGPIO_LINEINFO_CHANGED_READ - Read line info change events for watched lines from the chip.”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khjh²hubeh}”(h]”Œname”ah ]”h"]”Œname”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒSynopsis”h]”hŒSynopsis”…””}”(hj1h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj.h²hh³hÇh´Kubhò)”}”(hŒ2``int read(int chip_fd, void *buf, size_t count)``”h]”hŒliteral”“”)”}”(hjAh]”hŒ.int read(int chip_fd, void *buf, size_t count)”…””}”(hjEh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj?ubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khj.h²hubeh}”(h]”Œsynopsis”ah ]”h"]”Œsynopsis”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒ Arguments”h]”hŒ Arguments”…””}”(hjch²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj`h²hh³hÇh´KubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒS``chip_fd`` The file descriptor of the GPIO character device returned by `open()`. ”h]”(hŒterm”“”)”}”(hŒ ``chip_fd``”h]”jD)”}”(hj€h]”hŒchip_fd”…””}”(hj‚h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj~ubah}”(h]”h ]”h"]”h$]”h&]”uh1j|h³hÇh´KhjxubhŒ definition”“”)”}”(hhh]”hò)”}”(hŒFThe file descriptor of the GPIO character device returned by `open()`.”h]”(hŒ=The file descriptor of the GPIO character device returned by ”…””}”(hjšh²hh³Nh´NubhŒtitle_reference”“”)”}”(hŒ`open()`”h]”hŒopen()”…””}”(hj¤h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j¢hjšubhŒ.”…””}”(hjšh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khj—ubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hjxubeh}”(h]”h ]”h"]”h$]”h&]”uh1jvh³hÇh´Khjsubjw)”}”(hŒK``buf`` The buffer to contain the :c:type:`events`. ”h]”(j})”}”(hŒ``buf``”h]”jD)”}”(hjÎh]”hŒbuf”…””}”(hjÐh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjÌubah}”(h]”h ]”h"]”h$]”h&]”uh1j|h³hÇh´KhjÈubj–)”}”(hhh]”hò)”}”(hŒBThe buffer to contain the :c:type:`events`.”h]”(hŒThe buffer to contain the ”…””}”(hjæh²hh³Nh´Nubh)”}”(hŒ':c:type:`events`”h]”jD)”}”(hjðh]”hŒevents”…””}”(hjòh²hh³Nh´Nubah}”(h]”h ]”(Œxref”Œc”Œc-type”eh"]”h$]”h&]”uh1jChjîubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œ-userspace-api/gpio/gpio-lineinfo-changed-read”Œ refdomain”jýŒreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰Œ reftarget”Œgpioline_info_changed”uh1hh³hÇh´KhjæubhŒ.”…””}”(hjæh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khjãubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hjÈubeh}”(h]”h ]”h"]”h$]”h&]”uh1jvh³hÇh´Khjsh²hubjw)”}”(hŒ€``count`` The number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpioline_info_changed` event. ”h]”(j})”}”(hŒ ``count``”h]”jD)”}”(hj-h]”hŒcount”…””}”(hj/h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj+ubah}”(h]”h ]”h"]”h$]”h&]”uh1j|h³hÇh´K#hj'ubj–)”}”(hhh]”hò)”}”(hŒuThe number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpioline_info_changed` event.”h]”(hŒ!The number of bytes available in ”…””}”(hjEh²hh³Nh´NubjD)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hjMh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjEubhŒ', which must be at least the size of a ”…””}”(hjEh²hh³Nh´Nubh)”}”(hŒ:c:type:`gpioline_info_changed`”h]”jD)”}”(hjah]”hŒgpioline_info_changed”…””}”(hjch²hh³Nh´Nubah}”(h]”h ]”(jüjýŒc-type”eh"]”h$]”h&]”uh1jChj_ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jýŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jŒgpioline_info_changed”uh1hh³hÇh´K"hjEubhŒ event.”…””}”(hjEh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K"hjBubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hj'ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jvh³hÇh´K#hjsh²hubeh}”(h]”h ]”h"]”h$]”h&]”uh1jqhj`h²hh³hÇh´Nubeh}”(h]”Œ arguments”ah ]”h"]”Œ arguments”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒ Description”h]”hŒ Description”…””}”(hj¥h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj¢h²hh³hÇh´K&ubhò)”}”(hŒ=Read line info change events for watched lines from the chip.”h]”hŒ=Read line info change events for watched lines from the chip.”…””}”(hj³h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K(hj¢h²hubhŒnote”“”)”}”(hX(Monitoring line info changes is not generally required, and would typically only be performed by a system monitoring component. These events relate to changes in a line's request state or configuration, not its value. Use gpio-lineevent-data-read.rst to receive events when a line changes value.”h]”(hò)”}”(hŒMonitoring line info changes is not generally required, and would typically only be performed by a system monitoring component.”h]”hŒMonitoring line info changes is not generally required, and would typically only be performed by a system monitoring component.”…””}”(hjÇh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K+hjÃubhò)”}”(hŒ§These events relate to changes in a line's request state or configuration, not its value. Use gpio-lineevent-data-read.rst to receive events when a line changes value.”h]”hŒ©These events relate to changes in a line’s request state or configuration, not its value. Use gpio-lineevent-data-read.rst to receive events when a line changes value.”…””}”(hjÕh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K.hjÃubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÁhj¢h²hh³hÇh´Nubhò)”}”(hŒÆA line must be watched using gpio-get-lineinfo-watch-ioctl.rst to generate info changed events. Subsequently, a request, release, or reconfiguration of the line will generate an info changed event.”h]”hŒÆA line must be watched using gpio-get-lineinfo-watch-ioctl.rst to generate info changed events. Subsequently, a request, release, or reconfiguration of the line will generate an info changed event.”…””}”(hjéh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K2hj¢h²hubhò)”}”(hŒ”The kernel timestamps events when they occur and stores them in a buffer from where they can be read by userspace at its convenience using `read()`.”h]”(hŒ‹The kernel timestamps events when they occur and stores them in a buffer from where they can be read by userspace at its convenience using ”…””}”(hj÷h²hh³Nh´Nubj£)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjÿh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j¢hj÷ubhŒ.”…””}”(hj÷h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K6hj¢h²hubhò)”}”(hŒJThe size of the kernel event buffer is fixed at 32 events per ``chip_fd``.”h]”(hŒ>The size of the kernel event buffer is fixed at 32 events per ”…””}”(hjh²hh³Nh´NubjD)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjubhŒ.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K9hj¢h²hubhò)”}”(hŒÅThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the most recent event is discarded. Overflow cannot be detected from userspace.”h]”hŒÅThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the most recent event is discarded. Overflow cannot be detected from userspace.”…””}”(hj7h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K;hj¢h²hubhò)”}”(hŒ©Events read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one ``chip_fd``.”h]”(hŒEvents read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one ”…””}”(hjEh²hh³Nh´NubjD)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hjMh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjEubhŒ.”…””}”(hjEh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K?hj¢h²hubhò)”}”(hXTo minimize the number of calls required to copy events from the kernel to userspace, `read()` supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (``buf``).”h]”(hŒVTo minimize the number of calls required to copy events from the kernel to userspace, ”…””}”(hjeh²hh³Nh´Nubj£)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjmh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j¢hjeubhŒ¯ 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 (”…””}”(hjeh²hh³Nh´NubjD)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjeubhŒ).”…””}”(hjeh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KChj¢h²hubhò)”}”(hŒcA `read()` will block if no event is available and the ``chip_fd`` has not been set **O_NONBLOCK**.”h]”(hŒA ”…””}”(hj—h²hh³Nh´Nubj£)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjŸh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j¢hj—ubhŒ- will block if no event is available and the ”…””}”(hj—h²hh³Nh´NubjD)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hj±h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj—ubhŒ has not been set ”…””}”(hj—h²hh³Nh´NubhŒstrong”“”)”}”(hŒ**O_NONBLOCK**”h]”hŒ O_NONBLOCK”…””}”(hjÅh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jÃhj—ubhŒ.”…””}”(hj—h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KHhj¢h²hubhò)”}”(hŒxThe presence of an event can be tested for by checking that the ``chip_fd`` is readable using `poll()` or an equivalent.”h]”(hŒ@The presence of an event can be tested for by checking that the ”…””}”(hjÝh²hh³Nh´NubjD)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hjåh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjÝubhŒ is readable using ”…””}”(hjÝh²hh³Nh´Nubj£)”}”(hŒ`poll()`”h]”hŒpoll()”…””}”(hj÷h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j¢hjÝubhŒ or an equivalent.”…””}”(hjÝh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KKhj¢h²hubhò)”}”(hŒFirst added in 5.7.”h]”hŒFirst added in 5.7.”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KNhj¢h²hubeh}”(h]”Œ description”ah ]”h"]”Œ description”ah$]”h&]”uh1hÖhhØh²hh³hÇh´K&ubh×)”}”(hhh]”(hÜ)”}”(hŒ Return Value”h]”hŒ Return Value”…””}”(hj(h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj%h²hh³hÇh´KQubhò)”}”(hŒuOn success the number of bytes read, which will be a multiple of the size of a :c:type:`gpioline_info_changed` event.”h]”(hŒOOn success the number of bytes read, which will be a multiple of the size of a ”…””}”(hj6h²hh³Nh´Nubh)”}”(hŒ:c:type:`gpioline_info_changed`”h]”jD)”}”(hj@h]”hŒgpioline_info_changed”…””}”(hjBh²hh³Nh´Nubah}”(h]”h ]”(jüjýŒc-type”eh"]”h$]”h&]”uh1jChj>ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jýŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jŒgpioline_info_changed”uh1hh³hÇh´KShj6ubhŒ event.”…””}”(hj6h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KShj%h²hubhò)”}”(hŒqOn error -1 and the ``errno`` variable is set appropriately. Common error codes are described in error-codes.rst.”h]”(hŒOn error -1 and the ”…””}”(hjgh²hh³Nh´NubjD)”}”(hŒ ``errno``”h]”hŒerrno”…””}”(hjoh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjgubhŒT variable is set appropriately. 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