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These events relate to changes in a line's request state or configuration, not its value. Use gpio-v2-line-event-read.rst to receive events when a line changes value.”h]”(hé)”}”(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.”…””}”(hj™hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K'hj•ubhé)”}”(hŒ¦These events relate to changes in a line's request state or configuration, not its value. Use gpio-v2-line-event-read.rst to receive events when a line changes value.”h]”hŒ¨These events relate to changes in a line’s request state or configuration, not its value. Use gpio-v2-line-event-read.rst to receive events when a line changes value.”…””}”(hj§hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K*hj•ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j“hjthžhhŸh³h Nubhé)”}”(hŒÉA line must be watched using gpio-v2-get-lineinfo-watch-ioctl.rst to generate info changed events. Subsequently, a request, release, or reconfiguration of the line will generate an info changed event.”h]”hŒÉA line must be watched using gpio-v2-get-lineinfo-watch-ioctl.rst to generate info changed events. Subsequently, a request, release, or reconfiguration of the line will generate an info changed event.”…””}”(hj»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K.hjthžhubhé)”}”(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 ”…””}”(hjÉhžhhŸNh Nubju)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjÑhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jthjÉubhŒ.”…””}”(hjÉhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K2hjthžhubhé)”}”(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 ”…””}”(hjéhžhhŸNh Nubj)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hjñhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjéubhŒ.”…””}”(hjéhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K5hjthžhubhé)”}”(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.”…””}”(hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K7hjthžhubhé)”}”(hŒ©Events read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one ``chip_fd``.”h]”(hŒEvents read from the buffer are always in the same order that they were detected by the kernel, including when multiple lines are being monitored by the one ”…””}”(hjhžhhŸNh Nubj)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubhŒ.”…””}”(hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K;hjthžhubhé)”}”(hXTo minimize the number of calls required to copy events from the kernel to userspace, `read()` supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (``buf``).”h]”(hŒVTo minimize the number of calls required to copy events from the kernel to userspace, ”…””}”(hj7hžhhŸNh Nubju)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj?hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jthj7ubhŒ¯ 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 (”…””}”(hj7hžhhŸNh Nubj)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hjQhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj7ubhŒ).”…””}”(hj7hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h K?hjthžhubhé)”}”(hŒcA `read()` will block if no event is available and the ``chip_fd`` has not been set **O_NONBLOCK**.”h]”(hŒA ”…””}”(hjihžhhŸNh Nubju)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjqhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jthjiubhŒ- will block if no event is available and the ”…””}”(hjihžhhŸNh Nubj)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hjƒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjiubhŒ has not been set ”…””}”(hjihžhhŸNh NubhŒstrong”“”)”}”(hŒ**O_NONBLOCK**”h]”hŒ O_NONBLOCK”…””}”(hj—hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hjiubhŒ.”…””}”(hjihžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KDhjthžhubhé)”}”(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 ”…””}”(hj¯hžhhŸNh Nubj)”}”(hŒ ``chip_fd``”h]”hŒchip_fd”…””}”(hj·hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¯ubhŒ is readable using ”…””}”(hj¯hžhhŸNh Nubju)”}”(hŒ`poll()`”h]”hŒpoll()”…””}”(hjÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jthj¯ubhŒ or an equivalent.”…””}”(hj¯hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KGhjthžhubeh}”(h]”Œ description”ah ]”h"]”Œ description”ah$]”h&]”uh1hÂhhÄhžhhŸh³h K"ubhÃ)”}”(hhh]”(hÈ)”}”(hŒ Return Value”h]”hŒ Return Value”…””}”(hjìhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjéhžhhŸh³h KKubhé)”}”(hŒyOn success the number of bytes read, which will be a multiple of the size of a :c:type:`gpio_v2_line_info_changed` event.”h]”(hŒOOn success the number of bytes read, which will be a multiple of the size of a ”…””}”(hjúhžhhŸNh Nubh)”}”(hŒ#:c:type:`gpio_v2_line_info_changed`”h]”j)”}”(hjh]”hŒgpio_v2_line_info_changed”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”(jÎjÏŒc-type”eh"]”h$]”h&]”uh1jhjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jÛŒ refdomain”jÏŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jáŒgpio_v2_line_info_changed”uh1hhŸh³h KMhjúubhŒ event.”…””}”(hjúhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh³h KMhjéhžhubhé)”}”(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+hžhhŸNh Nubj)”}”(hŒ ``errno``”h]”hŒerrno”…””}”(hj3hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj+ubhŒT variable is set appropriately. 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