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