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NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COLOPHON |
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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, IOC_WATCH_QUEUE_SET_SIZE, int size);
int ioctl(int pipefd, 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 6.15 2025-05-17 ioctl_pipe(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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