Using eventfd user space can generate POLLIN/POLLOUT events but some applications may want to generate POLLPRI/POLLERR events as well. This patch submission aims to generalize the events generated by an eventfd. This is a resubmission of a patch from Feb 2013[1]. The original discussion trailed off without any conclusion, but the original author has recently confirmed[2] that this functionality is still useful, so I volunteered to rebase and resubmit the patch for discussion. [1] https://lkml.org/lkml/2013/2/18/147 [2] https://lkml.org/lkml/2015/7/9/153 Changes in v3 ------------- * replace efd_mask structure with scalar 'events' variable. Changes in v2 ------------- * rebased on Linux v4.3-rc1 * Move file operation implementations for EFD_MASK to a seperate structure * Remove 'data' element from efd_mask structure * read() is no longer supported when EFD_MASK is set (fails with EINVAL) * eventfd_ctx_fileget() now returns EINVAL when EFD_MASK is set, eliminating the possibility of triggering the orginal BUG_ON() macros which have now been removed. Thank you, Damian Martin Sustrik (1): eventfd: implementation of EFD_MASK flag fs/eventfd.c | 91 ++++++++++++++++++++++++++++++++++++++------ include/linux/eventfd.h | 16 +------- include/uapi/linux/eventfd.h | 40 +++++++++++++++++++ 3 files changed, 121 insertions(+), 26 deletions(-) create mode 100644 include/uapi/linux/eventfd.h -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
