Man page - ioctl_pipe(2)

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Manual

ioctl_pipe

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO

NAME

ioctl_pipe - ioctl() operations for General notification mechanism

SYNOPSIS

#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 );

DESCRIPTION

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];
};