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In legacy sysfs GPIO, when using poll(2) on the sysfs GPIO value for state change awaiting, a subsequent read(2) is required for consuming the event, which the doc recommends the use of lseek(2) or close-and-reopen to reset the file offset afterwards. The recommendations however, require at least 2 syscalls to consume the event. Gladly, use of pread(2) require only 1 syscall for the consumption. Let's advertise this usage by prioritizing its placement. Signed-off-by: Huichun Feng <foxhoundsk.tw@gmail.com> Link: https://lore.kernel.org/r/20240609173728.2950808-1-foxhoundsk.tw@gmail.com Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> |
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| .. | ||
| accelerators | ||
| ebpf | ||
| gpio | ||
| ioctl | ||
| media | ||
| netlink | ||
| dcdbas.rst | ||
| dma-buf-alloc-exchange.rst | ||
| ELF.rst | ||
| futex2.rst | ||
| index.rst | ||
| iommu.rst | ||
| iommufd.rst | ||
| isapnp.rst | ||
| landlock.rst | ||
| lsm.rst | ||
| mseal.rst | ||
| no_new_privs.rst | ||
| perf_ring_buffer.rst | ||
| seccomp_filter.rst | ||
| spec_ctrl.rst | ||
| sysfs-platform_profile.rst | ||
| tee.rst | ||
| unshare.rst | ||
| vduse.rst | ||