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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __BPF_UTIL__
#define __BPF_UTIL__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <syscall.h>
#include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
#include <linux/args.h>
static inline unsigned int bpf_num_possible_cpus(void)
{
int possible_cpus = libbpf_num_possible_cpus();
if (possible_cpus < 0) {
printf("Failed to get # of possible cpus: '%s'!\n",
strerror(-possible_cpus));
exit(1);
}
return possible_cpus;
}
/*
* Simplified strscpy() implementation. The kernel one is in lib/string.c
*/
static inline ssize_t sized_strscpy(char *dest, const char *src, size_t count)
{
long res = 0;
if (count == 0)
return -E2BIG;
while (count > 1) {
char c;
c = src[res];
dest[res] = c;
if (!c)
return res;
res++;
count--;
}
/* Force NUL-termination. */
dest[res] = '\0';
/* Return E2BIG if the source didn't stop */
return src[res] ? -E2BIG : res;
}
#define __strscpy0(dst, src, ...) \
sized_strscpy(dst, src, sizeof(dst))
#define __strscpy1(dst, src, size) \
sized_strscpy(dst, src, size)
#undef strscpy /* Redefine the placeholder from tools/include/linux/string.h */
#define strscpy(dst, src, ...) \
CONCATENATE(__strscpy, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
#define __bpf_percpu_val_align __attribute__((__aligned__(8)))
#define BPF_DECLARE_PERCPU(type, name) \
struct { type v; /* padding */ } __bpf_percpu_val_align \
name[bpf_num_possible_cpus()]
#define bpf_percpu(name, cpu) name[(cpu)].v
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
#ifndef sizeof_field
#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
#endif
#ifndef offsetofend
#define offsetofend(TYPE, MEMBER) \
(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
#endif
/* Availability of gettid across glibc versions is hit-and-miss, therefore
* fallback to syscall in this macro and use it everywhere.
*/
#ifndef sys_gettid
#define sys_gettid() syscall(SYS_gettid)
#endif
/* and poison usage to ensure it does not creep back in. */
#pragma GCC poison gettid
#ifndef ENOTSUPP
#define ENOTSUPP 524
#endif
#endif /* __BPF_UTIL__ */
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