include/qemu/osdep.h

   1 #ifndef QEMU_OSDEP_H
   2 #define QEMU_OSDEP_H
   3
   4 #include "config-host.h"
   5 #include <stdarg.h>
   6 #include <stddef.h>
   7 #include <stdbool.h>
   8 #include <sys/types.h>
   9 #ifdef __OpenBSD__
  10 #include <sys/signal.h>
  11 #endif
  12
  13 #ifndef _WIN32
  14 #include <sys/wait.h>
  15 #else
  16 #define WIFEXITED(x)   1
  17 #define WEXITSTATUS(x) (x)
  18 #endif
  19
  20 #include <sys/time.h>
  21
  22 #if defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10
  23 /* [u]int_fast*_t not in <sys/int_types.h> */
  24 typedef unsigned char           uint_fast8_t;
  25 typedef unsigned int            uint_fast16_t;
  26 typedef signed int              int_fast16_t;
  27 #endif
  28
  29 #ifndef glue
  30 #define xglue(x, y) x ## y
  31 #define glue(x, y) xglue(x, y)
  32 #define stringify(s)    tostring(s)
  33 #define tostring(s)     #s
  34 #endif
  35
  36 #ifndef likely
  37 #if __GNUC__ < 3
  38 #define __builtin_expect(x, n) (x)
  39 #endif
  40
  41 #define likely(x)   __builtin_expect(!!(x), 1)
  42 #define unlikely(x)   __builtin_expect(!!(x), 0)
  43 #endif
  44
  45 #ifndef container_of
  46 #define container_of(ptr, type, member) ({                      \
  47         const typeof(((type *) 0)->member) *__mptr = (ptr);     \
  48         (type *) ((char *) __mptr - offsetof(type, member));})
  49 #endif
  50
  51 /* Convert from a base type to a parent type, with compile time checking.  */
  52 #ifdef __GNUC__
  53 #define DO_UPCAST(type, field, dev) ( __extension__ ( { \
  54     char __attribute__((unused)) offset_must_be_zero[ \
  55         -offsetof(type, field)]; \
  56     container_of(dev, type, field);}))
  57 #else
  58 #define DO_UPCAST(type, field, dev) container_of(dev, type, field)
  59 #endif
  60
  61 #define typeof_field(type, field) typeof(((type *)0)->field)
  62 #define type_check(t1,t2) ((t1*)0 - (t2*)0)
  63
  64 #ifndef MIN
  65 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  66 #endif
  67 #ifndef MAX
  68 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  69 #endif
  70
  71 /* Minimum function that returns zero only iff both values are zero.
  72  * Intended for use with unsigned values only. */
  73 #ifndef MIN_NON_ZERO
  74 #define MIN_NON_ZERO(a, b) (((a) != 0 && (a) < (b)) ? (a) : (b))
  75 #endif
  76
  77 #ifndef ROUND_UP
  78 #define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
  79 #endif
  80
  81 #ifndef DIV_ROUND_UP
  82 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  83 #endif
  84
  85 #ifndef ARRAY_SIZE
  86 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  87 #endif
  88
  89 #ifndef always_inline
  90 #if !((__GNUC__ < 3) || defined(__APPLE__))
  91 #ifdef __OPTIMIZE__
  92 #undef inline
  93 #define inline __attribute__ (( always_inline )) __inline__
  94 #endif
  95 #endif
  96 #else
  97 #undef inline
  98 #define inline always_inline
  99 #endif
 100
 101 #define qemu_printf printf
 102
 103 int qemu_daemon(int nochdir, int noclose);
 104 void *qemu_try_memalign(size_t alignment, size_t size);
 105 void *qemu_memalign(size_t alignment, size_t size);
 106 void *qemu_anon_ram_alloc(size_t size);
 107 void qemu_vfree(void *ptr);
 108 void qemu_anon_ram_free(void *ptr, size_t size);
 109
 110 #define QEMU_MADV_INVALID -1
 111
 112 #if defined(CONFIG_MADVISE)
 113
 114 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
 115 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
 116 #ifdef MADV_DONTFORK
 117 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
 118 #else
 119 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 120 #endif
 121 #ifdef MADV_MERGEABLE
 122 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 123 #else
 124 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 125 #endif
 126 #ifdef MADV_UNMERGEABLE
 127 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
 128 #else
 129 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 130 #endif
 131 #ifdef MADV_DODUMP
 132 #define QEMU_MADV_DODUMP MADV_DODUMP
 133 #else
 134 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 135 #endif
 136 #ifdef MADV_DONTDUMP
 137 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
 138 #else
 139 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 140 #endif
 141 #ifdef MADV_HUGEPAGE
 142 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
 143 #else
 144 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
 145 #endif
 146
 147 #elif defined(CONFIG_POSIX_MADVISE)
 148
 149 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 150 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 151 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 152 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 153 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 154 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 155 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 156 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 157
 158 #else /* no-op */
 159
 160 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 161 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 162 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 163 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 164 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 165 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 166 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 167 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 168
 169 #endif
 170
 171 int qemu_madvise(void *addr, size_t len, int advice);
 172
 173 int qemu_open(const char *name, int flags, ...);
 174 int qemu_close(int fd);
 175
 176 #if defined(__HAIKU__) && defined(__i386__)
 177 #define FMT_pid "%ld"
 178 #elif defined(WIN64)
 179 #define FMT_pid "%" PRId64
 180 #else
 181 #define FMT_pid "%d"
 182 #endif
 183
 184 int qemu_create_pidfile(const char *filename);
 185 int qemu_get_thread_id(void);
 186
 187 #ifndef CONFIG_IOVEC
 188 struct iovec {
 189     void *iov_base;
 190     size_t iov_len;
 191 };
 192 /*
 193  * Use the same value as Linux for now.
 194  */
 195 #define IOV_MAX 1024
 196
 197 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
 198 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
 199 #else
 200 #include <sys/uio.h>
 201 #endif
 202
 203 #ifdef _WIN32
 204 static inline void qemu_timersub(const struct timeval *val1,
 205                                  const struct timeval *val2,
 206                                  struct timeval *res)
 207 {
 208     res->tv_sec = val1->tv_sec - val2->tv_sec;
 209     if (val1->tv_usec < val2->tv_usec) {
 210         res->tv_sec--;
 211         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
 212     } else {
 213         res->tv_usec = val1->tv_usec - val2->tv_usec;
 214     }
 215 }
 216 #else
 217 #define qemu_timersub timersub
 218 #endif
 219
 220 void qemu_set_cloexec(int fd);
 221
 222 void qemu_set_version(const char *);
 223 const char *qemu_get_version(void);
 224
 225 void fips_set_state(bool requested);
 226 bool fips_get_state(void);
 227
 228 /* Return a dynamically allocated pathname denoting a file or directory that is
 229  * appropriate for storing local state.
 230  *
 231  * @relative_pathname need not start with a directory separator; one will be
 232  * added automatically.
 233  *
 234  * The caller is responsible for releasing the value returned with g_free()
 235  * after use.
 236  */
 237 char *qemu_get_local_state_pathname(const char *relative_pathname);
 238
 239 /* Find program directory, and save it for later usage with
 240  * qemu_get_exec_dir().
 241  * Try OS specific API first, if not working, parse from argv0. */
 242 void qemu_init_exec_dir(const char *argv0);
 243
 244 /* Get the saved exec dir.
 245  * Caller needs to release the returned string by g_free() */
 246 char *qemu_get_exec_dir(void);
 247
 248 /**
 249  * qemu_getauxval:
 250  * @type: the auxiliary vector key to lookup
 251  *
 252  * Search the auxiliary vector for @type, returning the value
 253  * or 0 if @type is not present.
 254  */
 255 unsigned long qemu_getauxval(unsigned long type);
 256
 257 void qemu_set_tty_echo(int fd, bool echo);
 258
 259 void os_mem_prealloc(int fd, char *area, size_t sz);
 260
 261 #endif