ioctl_pipe - ioctl() operations for General notification mechanism

The following ioctl(2) operations are provided to set up general notification queue parameters. The notification queue is built on the top of a pipe(2) opened with the O_NOTIFICATION_PIPE flag. IOC_WATCH_QUEUE_SET_SIZE (since Linux 5.8) Preallocates the pipe buffer memory so that it can fit size notification messages. Currently, size must be between 1 and 512. IOC_WATCH_QUEUE_SET_FILTER (since Linux 5.8) Watch queue filter can limit events that are received. Filters are passed in a structwatch_notification_filter and each filter is described by a structwatch_notification_type_filter structure. struct watch_notification_filter { __u32 nr_filters; __u32 __reserved; struct watch_notification_type_filter filters[]; }; struct watch_notification_type_filter { __u32 type; __u32 info_filter; __u32 info_mask; __u32 subtype_filter[8]; };

ioctl_pipe - ioctl() operations for General notification mechanism

pipe(2), ioctl(2) Linux man-pages 6.9.1 2024-05-02 ioctl_pipe(2)

#include<linux/watch_queue.h> /* Definition of IOC_WATCH_QUEUE_* */ #include<sys/ioctl.h>intioctl(intpipefd[1],IOC_WATCH_QUEUE_SET_SIZE,intsize);intioctl(intpipefd[1],IOC_WATCH_QUEUE_SET_FILTER,structwatch_notification_filter*filter);