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Helper function bpf_timer_set_callback

v5.15

This helper sets the callback function for a timer.

Definition

Copyright (c) 2015 The Libbpf Authors. All rights reserved.

Configure the timer to call callback_fn static function.

Returns

0 on success. -EINVAL if timer was not initialized with bpf_timer_init() earlier. -EPERM if timer is in a map that doesn't have any user references. The user space should either hold a file descriptor to a map with timers or pin such map in bpffs. When map is unpinned or file descriptor is closed all timers in the map will be cancelled and freed.

static long (* const bpf_timer_set_callback)(struct bpf_timer *timer, void *callback_fn) = (void *) 170;

The function passed to callback_fn should have the following signature:

static int callback_fn(void *map, {map key type} *key, {map value type} *value)

Usage

Docs could be improved

This part of the docs is incomplete, contributions are very welcome

Program types

This helper call can be used in the following program types:

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome