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ioctl_pipe(2) System Calls Manual ioctl_pipe(2)

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.

Preallocates the pipe buffer memory so that it can fit size notification messages. Currently, size must be between 1 and 512.
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]; };

SEE ALSO

pipe(2), ioctl(2)

2024-05-02 Linux man-pages (unreleased)