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.
- 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]; };
SEE ALSO
2023-10-31 | Linux man-pages 6.7 |