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Options · 2
| 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. |
NAME
ioctl_pipe - ioctl() operations for General notification mechanism
SYNOPSIS
bash
#include <linux/watch_queue.h>\n /* Definition of \nIOC_WATCH_QUEUE_\n* */
\n#include <sys/ioctl.h>bash
int ioctl(int \npipefd\n[1], IOC_WATCH_QUEUE_SET_SIZE, int \nsize\n);\n
\nint ioctl(int \npipefd\n[1], IOC_WATCH_QUEUE_SET_FILTER,\n
\n struct watch_notification_filter *\nfilter\n);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.
- bash
struct watch_notification_filter { \n __u32 nr_filters; \n __u32 __reserved; \n struct watch_notification_type_filter filters[]; }; struct watch_notification_type_filter { \n __u32 type; \n __u32 info_filter; \n __u32 info_mask; \n __u32 subtype_filter[8]; };
SEE ALSO
pipe(2), ioctl(2)