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 #ifdef CONFIG_NEED_OFFSETOF
  30 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *) 0)->MEMBER)
  31 #endif
  32 #ifndef container_of
  33 #define container_of(ptr, type, member) ({                      \
  34         const typeof(((type *) 0)->member) *__mptr = (ptr);     \
  35         (type *) ((char *) __mptr - offsetof(type, member));})
  36 #endif
  37
  38 /* Convert from a base type to a parent type, with compile time checking.  */
  39 #ifdef __GNUC__
  40 #define DO_UPCAST(type, field, dev) ( __extension__ ( { \
  41     char __attribute__((unused)) offset_must_be_zero[ \
  42         -offsetof(type, field)]; \
  43     container_of(dev, type, field);}))
  44 #else
  45 #define DO_UPCAST(type, field, dev) container_of(dev, type, field)
  46 #endif
  47
  48 #define typeof_field(type, field) typeof(((type *)0)->field)
  49 #define type_check(t1,t2) ((t1*)0 - (t2*)0)
  50
  51 #ifndef MIN
  52 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  53 #endif
  54 #ifndef MAX
  55 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  56 #endif
  57
  58 #ifndef DIV_ROUND_UP
  59 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  60 #endif
  61
  62 #ifndef ARRAY_SIZE
  63 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  64 #endif
  65
  66 #ifndef always_inline
  67 #if !((__GNUC__ < 3) || defined(__APPLE__))
  68 #ifdef __OPTIMIZE__
  69 #define inline __attribute__ (( always_inline )) __inline__
  70 #endif
  71 #endif
  72 #else
  73 #define inline always_inline
  74 #endif
  75
  76 #ifdef __i386__
  77 #define REGPARM __attribute((regparm(3)))
  78 #else
  79 #define REGPARM
  80 #endif
  81
  82 #define qemu_printf printf
  83
  84 #if defined (__GNUC__) && defined (__GNUC_MINOR__)
  85 # define QEMU_GNUC_PREREQ(maj, min) \
  86          ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  87 #else
  88 # define QEMU_GNUC_PREREQ(maj, min) 0
  89 #endif
  90
  91 int qemu_daemon(int nochdir, int noclose);
  92 void *qemu_memalign(size_t alignment, size_t size);
  93 void *qemu_vmalloc(size_t size);
  94 void qemu_vfree(void *ptr);
  95
  96 #define QEMU_MADV_INVALID -1
  97
  98 #if defined(CONFIG_MADVISE)
  99
 100 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
 101 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
 102 #ifdef MADV_DONTFORK
 103 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
 104 #else
 105 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 106 #endif
 107 #ifdef MADV_MERGEABLE
 108 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 109 #else
 110 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 111 #endif
 112
 113 #elif defined(CONFIG_POSIX_MADVISE)
 114
 115 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 116 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 117 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 118 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 119
 120 #else /* no-op */
 121
 122 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 123 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 124 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 125 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 126
 127 #endif
 128
 129 int qemu_madvise(void *addr, size_t len, int advice);
 130
 131 int qemu_create_pidfile(const char *filename);
 132 int qemu_get_thread_id(void);
 133
 134 #ifdef _WIN32
 135 static inline void qemu_timersub(const struct timeval *val1,
 136                                  const struct timeval *val2,
 137                                  struct timeval *res)
 138 {
 139     res->tv_sec = val1->tv_sec - val2->tv_sec;
 140     if (val1->tv_usec < val2->tv_usec) {
 141         res->tv_sec--;
 142         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
 143     } else {
 144         res->tv_usec = val1->tv_usec - val2->tv_usec;
 145     }
 146 }
 147 #else
 148 #define qemu_timersub timersub
 149 #endif
 150
 151 #endif