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 #ifndef _WIN32
  12 #include <sys/time.h>
  13 #endif
  14
  15 #ifndef glue
  16 #define xglue(x, y) x ## y
  17 #define glue(x, y) xglue(x, y)
  18 #define stringify(s)    tostring(s)
  19 #define tostring(s)     #s
  20 #endif
  21
  22 #ifndef likely
  23 #if __GNUC__ < 3
  24 #define __builtin_expect(x, n) (x)
  25 #endif
  26
  27 #define likely(x)   __builtin_expect(!!(x), 1)
  28 #define unlikely(x)   __builtin_expect(!!(x), 0)
  29 #endif
  30
  31 #ifdef CONFIG_NEED_OFFSETOF
  32 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *) 0)->MEMBER)
  33 #endif
  34 #ifndef container_of
  35 #define container_of(ptr, type, member) ({                      \
  36         const typeof(((type *) 0)->member) *__mptr = (ptr);     \
  37         (type *) ((char *) __mptr - offsetof(type, member));})
  38 #endif
  39
  40 /* Convert from a base type to a parent type, with compile time checking.  */
  41 #ifdef __GNUC__
  42 #define DO_UPCAST(type, field, dev) ( __extension__ ( { \
  43     char __attribute__((unused)) offset_must_be_zero[ \
  44         -offsetof(type, field)]; \
  45     container_of(dev, type, field);}))
  46 #else
  47 #define DO_UPCAST(type, field, dev) container_of(dev, type, field)
  48 #endif
  49
  50 #define typeof_field(type, field) typeof(((type *)0)->field)
  51 #define type_check(t1,t2) ((t1*)0 - (t2*)0)
  52
  53 #ifndef MIN
  54 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  55 #endif
  56 #ifndef MAX
  57 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  58 #endif
  59
  60 #ifndef ARRAY_SIZE
  61 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  62 #endif
  63
  64 #ifndef always_inline
  65 #if !((__GNUC__ < 3) || defined(__APPLE__))
  66 #ifdef __OPTIMIZE__
  67 #define inline __attribute__ (( always_inline )) __inline__
  68 #endif
  69 #endif
  70 #else
  71 #define inline always_inline
  72 #endif
  73
  74 #ifdef __i386__
  75 #define REGPARM __attribute((regparm(3)))
  76 #else
  77 #define REGPARM
  78 #endif
  79
  80 #define qemu_printf printf
  81
  82 #if defined (__GNUC__) && defined (__GNUC_MINOR__)
  83 # define QEMU_GNUC_PREREQ(maj, min) \
  84          ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  85 #else
  86 # define QEMU_GNUC_PREREQ(maj, min) 0
  87 #endif
  88
  89 void *qemu_memalign(size_t alignment, size_t size);
  90 void *qemu_vmalloc(size_t size);
  91 void qemu_vfree(void *ptr);
  92
  93 #define QEMU_MADV_INVALID -1
  94
  95 #if defined(CONFIG_MADVISE)
  96
  97 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
  98 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
  99 #ifdef MADV_DONTFORK
 100 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
 101 #else
 102 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 103 #endif
 104 #ifdef MADV_MERGEABLE
 105 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 106 #else
 107 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 108 #endif
 109
 110 #elif defined(CONFIG_POSIX_MADVISE)
 111
 112 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 113 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 114 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 115 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 116
 117 #else /* no-op */
 118
 119 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 120 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 121 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 122 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 123
 124 #endif
 125
 126 int qemu_madvise(void *addr, size_t len, int advice);
 127
 128 int qemu_create_pidfile(const char *filename);
 129
 130 #ifdef _WIN32
 131 int ffs(int i);
 132
 133 int setenv(const char *name, const char *value, int overwrite);
 134
 135 typedef struct {
 136     long tv_sec;
 137     long tv_usec;
 138 } qemu_timeval;
 139 int qemu_gettimeofday(qemu_timeval *tp);
 140 #else
 141 typedef struct timeval qemu_timeval;
 142 #define qemu_gettimeofday(tp) gettimeofday(tp, NULL);
 143 #endif /* !_WIN32 */
 144
 145 #endif