70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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#include "util/bpf_map.h"
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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static bool bpf_map__is_per_cpu(enum bpf_map_type type)
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{
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return type == BPF_MAP_TYPE_PERCPU_HASH ||
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type == BPF_MAP_TYPE_PERCPU_ARRAY ||
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type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
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type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
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}
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static void *bpf_map__alloc_value(const struct bpf_map *map)
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{
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if (bpf_map__is_per_cpu(bpf_map__type(map)))
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return malloc(round_up(bpf_map__value_size(map), 8) *
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sysconf(_SC_NPROCESSORS_CONF));
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return malloc(bpf_map__value_size(map));
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}
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int bpf_map__fprintf(struct bpf_map *map, FILE *fp)
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{
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void *prev_key = NULL, *key, *value;
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int fd = bpf_map__fd(map), err;
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int printed = 0;
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if (fd < 0)
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return fd;
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err = -ENOMEM;
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key = malloc(bpf_map__key_size(map));
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if (key == NULL)
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goto out;
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value = bpf_map__alloc_value(map);
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if (value == NULL)
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goto out_free_key;
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while ((err = bpf_map_get_next_key(fd, prev_key, key) == 0)) {
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int intkey = *(int *)key;
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if (!bpf_map_lookup_elem(fd, key, value)) {
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bool boolval = *(bool *)value;
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if (boolval)
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printed += fprintf(fp, "[%d] = %d,\n", intkey, boolval);
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} else {
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printed += fprintf(fp, "[%d] = ERROR,\n", intkey);
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}
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prev_key = key;
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}
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if (err == ENOENT)
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err = printed;
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free(value);
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out_free_key:
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free(key);
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out:
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return err;
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}
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