compat-util.h

   1 #ifndef OS_COMPAT_H
   2 #define OS_COMPAT_H
   3
   4 #define _LARGE_FILES
   5 #define _FILE_OFFSET_BITS 64
   6 #define _BSD_SOURCE /* for mincore */
   7 #define _XOPEN_SOURCE 600 /* for posix_fadvise */
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <sys/mman.h>
  13 #include <string.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <errno.h>
  17 #include <assert.h>
  18
  19 #ifndef O_NOATIME
  20 #  define O_NOATIME 0
  21 #endif /* O_NOATIME */
  22
  23 #define PAGE_MASK               (~(page_size() -1))
  24 #define PAGE_ALIGN(addr)        (((addr) + page_size() - 1) & PAGE_MASK)
  25 #define PAGE_ALIGN_DOWN(addr) \
  26         (addr > page_size() ? PAGE_ALIGN(addr) - page_size() : 0)
  27
  28 static inline size_t page_size(void)
  29 {
  30         static size_t size;
  31
  32         if (!size)
  33                 size = sysconf(_SC_PAGESIZE);
  34
  35         return size;
  36 }
  37
  38 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  39
  40 #endif /* OS_COMPAT_H */