src/macro.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #ifndef __LXCFS_MACRO_H
   4 #define __LXCFS_MACRO_H
   5
   6 #include "config.h"
   7
   8 #include <stdio.h>
   9
  10 #define BATCH_SIZE 50
  11
  12 /* filesystem magic values */
  13 #ifndef CGROUP_SUPER_MAGIC
  14 #define CGROUP_SUPER_MAGIC 0x27e0eb
  15 #endif
  16
  17 #ifndef CGROUP2_SUPER_MAGIC
  18 #define CGROUP2_SUPER_MAGIC 0x63677270
  19 #endif
  20
  21 #define lxcfs_debug_stream(stream, format, ...)                       \
  22         do {                                                          \
  23                 fprintf(stream, "%s: %d: %s: " format "\n", __FILE__, \
  24                         __LINE__, __func__, ##__VA_ARGS__);           \
  25         } while (false)
  26
  27 #define lxcfs_error(format, ...) lxcfs_debug_stream(stderr, format, ##__VA_ARGS__)
  28
  29 #ifdef DEBUG
  30 #define lxcfs_debug(format, ...) lxcfs_error(format, ##__VA_ARGS__)
  31 #else
  32 #define lxcfs_debug(format, ...) \
  33         do {                     \
  34         } while (false)
  35 #endif /* DEBUG */
  36
  37 #ifdef VERBOSE
  38 #define lxcfs_v(format, ...) lxcfs_error(format, ##__VA_ARGS__);
  39 #else
  40 #define lxcfs_v(format, ...)
  41 #endif /* VERBOSE */
  42
  43 #define lxcfs_info(format, ...)                              \
  44         do {                                                 \
  45                 fprintf(stderr, format "\n", ##__VA_ARGS__); \
  46         } while (false)
  47
  48 #define log_error_errno(__ret__, __errno__, format, ...) \
  49         ({                                               \
  50                 errno = __errno__;                       \
  51                 lxcfs_error(format, ##__VA_ARGS__);      \
  52                 __ret__;                                 \
  53         })
  54
  55 #define log_error(__ret__, format, ...)             \
  56         ({                                          \
  57                 lxcfs_error(format, ##__VA_ARGS__); \
  58                 __ret__;                            \
  59         })
  60
  61 #define STRLITERALLEN(x) (sizeof(""x"") - 1)
  62
  63 /* Calculate the number of chars needed to represent a given integer as a C
  64  * string. Include room for '-' to indicate negative numbers and the \0 byte.
  65  * This is based on systemd.
  66  */
  67 #define INTTYPE_TO_STRLEN(type)                   \
  68         (2 + (sizeof(type) <= 1                   \
  69                   ? 3                             \
  70                   : sizeof(type) <= 2             \
  71                         ? 5                       \
  72                         : sizeof(type) <= 4       \
  73                               ? 10                \
  74                               : sizeof(type) <= 8 \
  75                                     ? 20          \
  76                                     : sizeof(int[-2 * (sizeof(type) > 8)])))
  77
  78 #define move_ptr(ptr)                                 \
  79         ({                                            \
  80                 __typeof__(ptr) __internal_ptr__ = (ptr); \
  81                 (ptr) = NULL;                         \
  82                 __internal_ptr__;                     \
  83         })
  84
  85 #define move_fd(fd)                         \
  86         ({                                  \
  87                 int __internal_fd__ = (fd); \
  88                 (fd) = -EBADF;              \
  89                 __internal_fd__;            \
  90         })
  91
  92 #define ret_errno(__errno__)       \
  93         ({                         \
  94                 errno = __errno__; \
  95                 -__errno__;        \
  96         })
  97
  98 #define ret_set_errno(__ret__, __errno__) \
  99         ({                                \
 100                 errno = __errno__;        \
 101                 __ret__;                  \
 102         })
 103
 104 #define lxc_iterate_parts(__iterator, __splitme, __separators)                  \
 105         for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
 106              (__iterator = __it);                                               \
 107              __iterator = __it = strtok_r(NULL, __separators, &__p))
 108
 109 #define log_exit(format, ...)                           \
 110         ({                                              \
 111                 fprintf(stderr, format, ##__VA_ARGS__); \
 112                 _exit(EXIT_FAILURE);                    \
 113         })
 114
 115 #ifdef DEBUG
 116 #define log_debug(__ret__, format, ...)                            \
 117         ({                                                         \
 118                 lxcfs_debug_stream(stderr, format, ##__VA_ARGS__); \
 119                 __ret__;                                           \
 120         })
 121 #else
 122 #define log_debug(__ret__, format, ...) ({ __ret__; })
 123 #endif
 124
 125 #define PTR_TO_INT(p) ((int)((intptr_t)(p)))
 126 #define INT_TO_PTR(u) ((void *)((intptr_t)(u)))
 127 #define PTR_TO_UINT64(p) ((uint64_t)((intptr_t)(p)))
 128 #define INTTYPE_TO_PTR(u) ((void *)((intptr_t)(u)))
 129
 130 #define __visible __attribute__((visibility("default")))
 131
 132 #define __lxcfs_fuse_ops
 133
 134 #ifndef __returns_twice
 135 #define __returns_twice __attribute__((returns_twice))
 136 #endif
 137
 138 #define STRINGIFY(a) __STRINGIFY(a)
 139 #define __STRINGIFY(a) #a
 140
 141 #endif /* __LXCFS_MACRO_H */