osdep.h

   1 #ifndef QEMU_OSDEP_H
   2 #define QEMU_OSDEP_H
   3
   4 #include <stdarg.h>
   5 #include <stddef.h>
   6 #ifdef __OpenBSD__
   7 #include <sys/types.h>
   8 #include <sys/signal.h>
   9 #endif
  10
  11 #include <sys/time.h>
  12
  13 #ifndef glue
  14 #define xglue(x, y) x ## y
  15 #define glue(x, y) xglue(x, y)
  16 #define stringify(s)    tostring(s)
  17 #define tostring(s)     #s
  18 #endif
  19
  20 #ifndef likely
  21 #if __GNUC__ < 3
  22 #define __builtin_expect(x, n) (x)
  23 #endif
  24
  25 #define likely(x)   __builtin_expect(!!(x), 1)
  26 #define unlikely(x)   __builtin_expect(!!(x), 0)
  27 #endif
  28
  29 #ifndef container_of
  30 #define container_of(ptr, type, member) ({                      \
  31         const typeof(((type *) 0)->member) *__mptr = (ptr);     \
  32         (type *) ((char *) __mptr - offsetof(type, member));})
  33 #endif
  34
  35 /* Convert from a base type to a parent type, with compile time checking.  */
  36 #ifdef __GNUC__
  37 #define DO_UPCAST(type, field, dev) ( __extension__ ( { \
  38     char __attribute__((unused)) offset_must_be_zero[ \
  39         -offsetof(type, field)]; \
  40     container_of(dev, type, field);}))
  41 #else
  42 #define DO_UPCAST(type, field, dev) container_of(dev, type, field)
  43 #endif
  44
  45 #define typeof_field(type, field) typeof(((type *)0)->field)
  46 #define type_check(t1,t2) ((t1*)0 - (t2*)0)
  47
  48 #ifndef MIN
  49 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  50 #endif
  51 #ifndef MAX
  52 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  53 #endif
  54
  55 #ifndef DIV_ROUND_UP
  56 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  57 #endif
  58
  59 #ifndef ARRAY_SIZE
  60 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  61 #endif
  62
  63 #ifndef always_inline
  64 #if !((__GNUC__ < 3) || defined(__APPLE__))
  65 #ifdef __OPTIMIZE__
  66 #define inline __attribute__ (( always_inline )) __inline__
  67 #endif
  68 #endif
  69 #else
  70 #define inline always_inline
  71 #endif
  72
  73 #define qemu_printf printf
  74
  75 int qemu_daemon(int nochdir, int noclose);
  76 void *qemu_memalign(size_t alignment, size_t size);
  77 void *qemu_vmalloc(size_t size);
  78 void qemu_vfree(void *ptr);
  79
  80 #define QEMU_MADV_INVALID -1
  81
  82 #if defined(CONFIG_MADVISE)
  83
  84 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
  85 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
  86 #ifdef MADV_DONTFORK
  87 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
  88 #else
  89 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
  90 #endif
  91 #ifdef MADV_MERGEABLE
  92 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
  93 #else
  94 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
  95 #endif
  96
  97 #elif defined(CONFIG_POSIX_MADVISE)
  98
  99 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 100 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 101 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 102 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 103
 104 #else /* no-op */
 105
 106 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 107 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 108 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 109 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 110
 111 #endif
 112
 113 int qemu_madvise(void *addr, size_t len, int advice);
 114
 115 #if defined(__HAIKU__) && defined(__i386__)
 116 #define FMT_pid "%ld"
 117 #elif defined(WIN64)
 118 #define FMT_pid "%" PRId64
 119 #else
 120 #define FMT_pid "%d"
 121 #endif
 122
 123 int qemu_create_pidfile(const char *filename);
 124 int qemu_get_thread_id(void);
 125
 126 #ifdef _WIN32
 127 static inline void qemu_timersub(const struct timeval *val1,
 128                                  const struct timeval *val2,
 129                                  struct timeval *res)
 130 {
 131     res->tv_sec = val1->tv_sec - val2->tv_sec;
 132     if (val1->tv_usec < val2->tv_usec) {
 133         res->tv_sec--;
 134         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
 135     } else {
 136         res->tv_usec = val1->tv_usec - val2->tv_usec;
 137     }
 138 }
 139 #else
 140 #define qemu_timersub timersub
 141 #endif
 142
 143 #endif