diff options
Diffstat (limited to 'tools/testing/selftests/bpf/bpf_util.h')
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_util.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h index a3352a64c067..5f6963a320d7 100644 --- a/tools/testing/selftests/bpf/bpf_util.h +++ b/tools/testing/selftests/bpf/bpf_util.h @@ -6,6 +6,7 @@ #include <stdlib.h> #include <string.h> #include <errno.h> +#include <syscall.h> #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */ static inline unsigned int bpf_num_possible_cpus(void) @@ -20,6 +21,25 @@ static inline unsigned int bpf_num_possible_cpus(void) return possible_cpus; } +/* Copy up to sz - 1 bytes from zero-terminated src string and ensure that dst + * is zero-terminated string no matter what (unless sz == 0, in which case + * it's a no-op). It's conceptually close to FreeBSD's strlcpy(), but differs + * in what is returned. Given this is internal helper, it's trivial to extend + * this, when necessary. Use this instead of strncpy inside libbpf source code. + */ +static inline void bpf_strlcpy(char *dst, const char *src, size_t sz) +{ + size_t i; + + if (sz == 0) + return; + + sz--; + for (i = 0; i < sz && src[i]; i++) + dst[i] = src[i]; + dst[i] = '\0'; +} + #define __bpf_percpu_val_align __attribute__((__aligned__(8))) #define BPF_DECLARE_PERCPU(type, name) \ @@ -40,4 +60,15 @@ static inline unsigned int bpf_num_possible_cpus(void) (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 + +#ifndef ENOTSUPP +#define ENOTSUPP 524 +#endif + #endif /* __BPF_UTIL__ */ |