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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef __BPF_UTIL__3#define __BPF_UTIL__4 5#include <stdio.h>6#include <stdlib.h>7#include <string.h>8#include <errno.h>9#include <bpf/libbpf.h> /* libbpf_num_possible_cpus */10 11static inline unsigned int bpf_num_possible_cpus(void)12{13 int possible_cpus = libbpf_num_possible_cpus();14 15 if (possible_cpus < 0) {16 printf("Failed to get # of possible cpus: '%s'!\n",17 strerror(-possible_cpus));18 exit(1);19 }20 return possible_cpus;21}22 23/* Copy up to sz - 1 bytes from zero-terminated src string and ensure that dst24 * is zero-terminated string no matter what (unless sz == 0, in which case25 * it's a no-op). It's conceptually close to FreeBSD's strlcpy(), but differs26 * in what is returned. Given this is internal helper, it's trivial to extend27 * this, when necessary. Use this instead of strncpy inside libbpf source code.28 */29static inline void bpf_strlcpy(char *dst, const char *src, size_t sz)30{31 size_t i;32 33 if (sz == 0)34 return;35 36 sz--;37 for (i = 0; i < sz && src[i]; i++)38 dst[i] = src[i];39 dst[i] = '\0';40}41 42#define __bpf_percpu_val_align __attribute__((__aligned__(8)))43 44#define BPF_DECLARE_PERCPU(type, name) \45 struct { type v; /* padding */ } __bpf_percpu_val_align \46 name[bpf_num_possible_cpus()]47#define bpf_percpu(name, cpu) name[(cpu)].v48 49#ifndef ARRAY_SIZE50# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))51#endif52 53#ifndef sizeof_field54#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))55#endif56 57#ifndef offsetofend58#define offsetofend(TYPE, MEMBER) \59 (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))60#endif61 62#endif /* __BPF_UTIL__ */63