src/macro.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #ifndef __LXCFS_MACRO_H
   4 #define __LXCFS_MACRO_H
   5
   6 #ifndef _GNU_SOURCE
   7 #define _GNU_SOURCE
   8 #endif
   9
  10 #ifndef FUSE_USE_VERSION
  11 #define FUSE_USE_VERSION 26
  12 #endif
  13
  14 #define _FILE_OFFSET_BITS 64
  15
  16 #include <stdio.h>
  17
  18 #include "config.h"
  19
  20 #define BATCH_SIZE 50
  21
  22 /* filesystem magic values */
  23 #ifndef CGROUP_SUPER_MAGIC
  24 #define CGROUP_SUPER_MAGIC 0x27e0eb
  25 #endif
  26
  27 #ifndef CGROUP2_SUPER_MAGIC
  28 #define CGROUP2_SUPER_MAGIC 0x63677270
  29 #endif
  30
  31 #define lxcfs_debug_stream(stream, format, ...)                       \
  32         do {                                                          \
  33                 fprintf(stream, "%s: %d: %s: " format "\n", __FILE__, \
  34                         __LINE__, __func__, ##__VA_ARGS__);           \
  35         } while (false)
  36
  37 #define lxcfs_error(format, ...) lxcfs_debug_stream(stderr, format, ##__VA_ARGS__)
  38
  39 #ifdef DEBUG
  40 #define lxcfs_debug(format, ...) lxcfs_error(format, ##__VA_ARGS__)
  41 #else
  42 #define lxcfs_debug(format, ...) \
  43         do {                     \
  44         } while (false)
  45 #endif /* DEBUG */
  46
  47 #ifdef VERBOSE
  48 #define lxcfs_v(format, ...) lxcfs_error(format, ##__VA_ARGS__);
  49 #else
  50 #define lxcfs_v(format, ...)
  51 #endif /* VERBOSE */
  52
  53 #define lxcfs_info(format, ...)                              \
  54         do {                                                 \
  55                 fprintf(stderr, format "\n", ##__VA_ARGS__); \
  56         } while (false)
  57
  58 #define log_error_errno(__ret__, __errno__, format, ...) \
  59         ({                                               \
  60                 errno = __errno__;                       \
  61                 lxcfs_error(format, ##__VA_ARGS__);      \
  62                 __ret__;                                 \
  63         })
  64
  65 #define log_error(__ret__, format, ...)             \
  66         ({                                          \
  67                 lxcfs_error(format, ##__VA_ARGS__); \
  68                 __ret__;                            \
  69         })
  70
  71 #define STRLITERALLEN(x) (sizeof(""x"") - 1)
  72
  73 /* Calculate the number of chars needed to represent a given integer as a C
  74  * string. Include room for '-' to indicate negative numbers and the \0 byte.
  75  * This is based on systemd.
  76  */
  77 #define INTTYPE_TO_STRLEN(type)                   \
  78         (2 + (sizeof(type) <= 1                   \
  79                   ? 3                             \
  80                   : sizeof(type) <= 2             \
  81                         ? 5                       \
  82                         : sizeof(type) <= 4       \
  83                               ? 10                \
  84                               : sizeof(type) <= 8 \
  85                                     ? 20          \
  86                                     : sizeof(int[-2 * (sizeof(type) > 8)])))
  87
  88 #define move_ptr(ptr)                                 \
  89         ({                                            \
  90                 __typeof__(ptr) __internal_ptr__ = (ptr); \
  91                 (ptr) = NULL;                         \
  92                 __internal_ptr__;                     \
  93         })
  94
  95 #define move_fd(fd)                         \
  96         ({                                  \
  97                 int __internal_fd__ = (fd); \
  98                 (fd) = -EBADF;              \
  99                 __internal_fd__;            \
 100         })
 101
 102 #define ret_errno(__errno__)       \
 103         ({                         \
 104                 errno = __errno__; \
 105                 -__errno__;        \
 106         })
 107
 108 #define ret_set_errno(__ret__, __errno__) \
 109         ({                                \
 110                 errno = __errno__;        \
 111                 __ret__;                  \
 112         })
 113
 114 #define lxc_iterate_parts(__iterator, __splitme, __separators)                  \
 115         for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
 116              (__iterator = __it);                                               \
 117              __iterator = __it = strtok_r(NULL, __separators, &__p))
 118
 119 #define log_exit(format, ...)                           \
 120         ({                                              \
 121                 fprintf(stderr, format, ##__VA_ARGS__); \
 122                 _exit(EXIT_FAILURE);                    \
 123         })
 124
 125 #ifdef DEBUG
 126 #define log_debug(__ret__, format, ...)                            \
 127         ({                                                         \
 128                 lxcfs_debug_stream(stderr, format, ##__VA_ARGS__); \
 129                 __ret__;                                           \
 130         })
 131 #else
 132 #define log_debug(__ret__, format, ...) ({ __ret__; })
 133 #endif
 134
 135 #define PTR_TO_INT(p) ((int)((intptr_t)(p)))
 136 #define INT_TO_PTR(u) ((void *)((intptr_t)(u)))
 137 #define PTR_TO_UINT64(p) ((uint64_t)((intptr_t)(p)))
 138 #define INTTYPE_TO_PTR(u) ((void *)((intptr_t)(u)))
 139
 140 #define __visible __attribute__((visibility("default")))
 141
 142 #define __lxcfs_fuse_ops
 143
 144 #ifndef __returns_twice
 145 #define __returns_twice __attribute__((returns_twice))
 146 #endif
 147
 148 #define STRINGIFY(a) __STRINGIFY(a)
 149 #define __STRINGIFY(a) #a
 150
 151 #endif /* __LXCFS_MACRO_H */