tools/testing/selftests/bpf/progs/err.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ERR_H__
   3 #define __ERR_H__
   4
   5 #define MAX_ERRNO 4095
   6 #define IS_ERR_VALUE(x) (unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO
   7
   8 #define __STR(x) #x
   9
  10 #define set_if_not_errno_or_zero(x, y)                  \
  11 ({                                                      \
  12         asm volatile ("if %0 s< -4095 goto +1\n"        \
  13                       "if %0 s<= 0 goto +1\n"           \
  14                       "%0 = " __STR(y) "\n"             \
  15                       : "+r"(x));                       \
  16 })
  17
  18 static inline int IS_ERR_OR_NULL(const void *ptr)
  19 {
  20         return !ptr || IS_ERR_VALUE((unsigned long)ptr);
  21 }
  22
  23 static inline long PTR_ERR(const void *ptr)
  24 {
  25         return (long) ptr;
  26 }
  27
  28 #endif /* __ERR_H__ */