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ioctl_pipe(2) System Calls Manual ioctl_pipe(2)
ioctl_pipe - ioctl() operations for General notification mechanism
#include <linux/watch_queue.h> /* Definition of IOC_WATCH_QUEUE_* */ #include <sys/ioctl.h> int ioctl(int pipefd[1], IOC_WATCH_QUEUE_SET_SIZE, int size); int ioctl(int pipefd[1], IOC_WATCH_QUEUE_SET_FILTER, struct watch_notification_filter *filter);
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 struct watch_notification_filter and each filter is described by a struct watch_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]; };
pipe(2), ioctl(2)
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Linux man-pages 6.9.1 2024-05-02 ioctl_pipe(2)