include/qemu/osdep.h

   1 /*
   2  * OS includes and handling of OS dependencies
   3  *
   4  * This header exists to pull in some common system headers that
   5  * most code in QEMU will want, and to fix up some possible issues with
   6  * it (missing defines, Windows weirdness, and so on).
   7  *
   8  * To avoid getting into possible circular include dependencies, this
   9  * file should not include any other QEMU headers, with the exceptions
  10  * of config-host.h, config-target.h, qemu/compiler.h,
  11  * sysemu/os-posix.h, sysemu/os-win32.h, glib-compat.h and
  12  * qemu/typedefs.h, all of which are doing a similar job to this file
  13  * and are under similar constraints.
  14  *
  15  * This header also contains prototypes for functions defined in
  16  * os-*.c and util/oslib-*.c; those would probably be better split
  17  * out into separate header files.
  18  *
  19  * In an ideal world this header would contain only:
  20  *  (1) things which everybody needs
  21  *  (2) things without which code would work on most platforms but
  22  *      fail to compile or misbehave on a minority of host OSes
  23  *
  24  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  25  * See the COPYING file in the top-level directory.
  26  */
  27 #ifndef QEMU_OSDEP_H
  28 #define QEMU_OSDEP_H
  29
  30 #include "config-host.h"
  31 #ifdef NEED_CPU_H
  32 #include "config-target.h"
  33 #else
  34 #include "exec/poison.h"
  35 #endif
  36
  37 #include "qemu/compiler.h"
  38
  39 /* Older versions of C++ don't get definitions of various macros from
  40  * stdlib.h unless we define these macros before first inclusion of
  41  * that system header.
  42  */
  43 #ifndef __STDC_CONSTANT_MACROS
  44 #define __STDC_CONSTANT_MACROS
  45 #endif
  46 #ifndef __STDC_LIMIT_MACROS
  47 #define __STDC_LIMIT_MACROS
  48 #endif
  49 #ifndef __STDC_FORMAT_MACROS
  50 #define __STDC_FORMAT_MACROS
  51 #endif
  52
  53 /* The following block of code temporarily renames the daemon() function so the
  54  * compiler does not see the warning associated with it in stdlib.h on OSX
  55  */
  56 #ifdef __APPLE__
  57 #define daemon qemu_fake_daemon_function
  58 #include <stdlib.h>
  59 #undef daemon
  60 extern int daemon(int, int);
  61 #endif
  62
  63 #ifdef _WIN32
  64 /* as defined in sdkddkver.h */
  65 #ifndef _WIN32_WINNT
  66 #define _WIN32_WINNT 0x0600 /* Vista */
  67 #endif
  68 /* reduces the number of implicitly included headers */
  69 #ifndef WIN32_LEAN_AND_MEAN
  70 #define WIN32_LEAN_AND_MEAN
  71 #endif
  72 #endif
  73
  74 /* enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later) */
  75 #ifdef __MINGW32__
  76 #define __USE_MINGW_ANSI_STDIO 1
  77 #endif
  78
  79 #include <stdarg.h>
  80 #include <stddef.h>
  81 #include <stdbool.h>
  82 #include <stdint.h>
  83 #include <sys/types.h>
  84 #include <stdlib.h>
  85 #include <stdio.h>
  86
  87 #include <string.h>
  88 #include <strings.h>
  89 #include <inttypes.h>
  90 #include <limits.h>
  91 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
  92  * function availability on recentish Mingw-w64 platforms. */
  93 #include <unistd.h>
  94 #include <time.h>
  95 #include <ctype.h>
  96 #include <errno.h>
  97 #include <fcntl.h>
  98 #include <getopt.h>
  99 #include <sys/stat.h>
 100 #include <sys/time.h>
 101 #include <assert.h>
 102 /* setjmp must be declared before sysemu/os-win32.h
 103  * because it is redefined there. */
 104 #include <setjmp.h>
 105 #include <signal.h>
 106
 107 #ifdef __OpenBSD__
 108 #include <sys/signal.h>
 109 #endif
 110
 111 #ifndef _WIN32
 112 #include <sys/wait.h>
 113 #else
 114 #define WIFEXITED(x)   1
 115 #define WEXITSTATUS(x) (x)
 116 #endif
 117
 118 #ifdef _WIN32
 119 #include "sysemu/os-win32.h"
 120 #endif
 121
 122 #ifdef CONFIG_POSIX
 123 #include "sysemu/os-posix.h"
 124 #endif
 125
 126 #include "glib-compat.h"
 127 #include "qemu/typedefs.h"
 128
 129 /*
 130  * For mingw, as of v6.0.0, the function implementing the assert macro is
 131  * not marked as noreturn, so the compiler cannot delete code following an
 132  * assert(false) as unused.  We rely on this within the code base to delete
 133  * code that is unreachable when features are disabled.
 134  * All supported versions of Glib's g_assert() satisfy this requirement.
 135  */
 136 #ifdef __MINGW32__
 137 #undef assert
 138 #define assert(x)  g_assert(x)
 139 #endif
 140
 141 /*
 142  * According to waitpid man page:
 143  * WCOREDUMP
 144  *  This  macro  is  not  specified  in POSIX.1-2001 and is not
 145  *  available on some UNIX implementations (e.g., AIX, SunOS).
 146  *  Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif.
 147  */
 148 #ifndef WCOREDUMP
 149 #define WCOREDUMP(status) 0
 150 #endif
 151 /*
 152  * We have a lot of unaudited code that may fail in strange ways, or
 153  * even be a security risk during migration, if you disable assertions
 154  * at compile-time.  You may comment out these safety checks if you
 155  * absolutely want to disable assertion overhead, but it is not
 156  * supported upstream so the risk is all yours.  Meanwhile, please
 157  * submit patches to remove any side-effects inside an assertion, or
 158  * fixing error handling that should use Error instead of assert.
 159  */
 160 #ifdef NDEBUG
 161 #error building with NDEBUG is not supported
 162 #endif
 163 #ifdef G_DISABLE_ASSERT
 164 #error building with G_DISABLE_ASSERT is not supported
 165 #endif
 166
 167 #ifndef O_LARGEFILE
 168 #define O_LARGEFILE 0
 169 #endif
 170 #ifndef O_BINARY
 171 #define O_BINARY 0
 172 #endif
 173 #ifndef MAP_ANONYMOUS
 174 #define MAP_ANONYMOUS MAP_ANON
 175 #endif
 176 #ifndef ENOMEDIUM
 177 #define ENOMEDIUM ENODEV
 178 #endif
 179 #if !defined(ENOTSUP)
 180 #define ENOTSUP 4096
 181 #endif
 182 #if !defined(ECANCELED)
 183 #define ECANCELED 4097
 184 #endif
 185 #if !defined(EMEDIUMTYPE)
 186 #define EMEDIUMTYPE 4098
 187 #endif
 188 #if !defined(ESHUTDOWN)
 189 #define ESHUTDOWN 4099
 190 #endif
 191
 192 /* time_t may be either 32 or 64 bits depending on the host OS, and
 193  * can be either signed or unsigned, so we can't just hardcode a
 194  * specific maximum value. This is not a C preprocessor constant,
 195  * so you can't use TIME_MAX in an #ifdef, but for our purposes
 196  * this isn't a problem.
 197  */
 198
 199 /* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from
 200  * Gnulib, and are under the LGPL v2.1 or (at your option) any
 201  * later version.
 202  */
 203
 204 /* True if the real type T is signed.  */
 205 #define TYPE_SIGNED(t) (!((t)0 < (t)-1))
 206
 207 /* The width in bits of the integer type or expression T.
 208  * Padding bits are not supported.
 209  */
 210 #define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT)
 211
 212 /* The maximum and minimum values for the integer type T.  */
 213 #define TYPE_MAXIMUM(t)                                                \
 214   ((t) (!TYPE_SIGNED(t)                                                \
 215         ? (t)-1                                                        \
 216         : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1)))
 217
 218 #ifndef TIME_MAX
 219 #define TIME_MAX TYPE_MAXIMUM(time_t)
 220 #endif
 221
 222 /* HOST_LONG_BITS is the size of a native pointer in bits. */
 223 #if UINTPTR_MAX == UINT32_MAX
 224 # define HOST_LONG_BITS 32
 225 #elif UINTPTR_MAX == UINT64_MAX
 226 # define HOST_LONG_BITS 64
 227 #else
 228 # error Unknown pointer size
 229 #endif
 230
 231 /* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with
 232  * the wrong type. Our replacement isn't usable in preprocessor
 233  * expressions, but it is sufficient for our needs. */
 234 #if defined(HAVE_BROKEN_SIZE_MAX) && HAVE_BROKEN_SIZE_MAX
 235 #undef SIZE_MAX
 236 #define SIZE_MAX ((size_t)-1)
 237 #endif
 238
 239 /*
 240  * Two variations of MIN/MAX macros. The first is for runtime use, and
 241  * evaluates arguments only once (so it is safe even with side
 242  * effects), but will not work in constant contexts (such as array
 243  * size declarations) because of the '{}'.  The second is for constant
 244  * expression use, where evaluating arguments twice is safe because
 245  * the result is going to be constant anyway, but will not work in a
 246  * runtime context because of a void expression where a value is
 247  * expected.  Thus, both gcc and clang will fail to compile if you use
 248  * the wrong macro (even if the error may seem a bit cryptic).
 249  *
 250  * Note that neither form is usable as an #if condition; if you truly
 251  * need to write conditional code that depends on a minimum or maximum
 252  * determined by the pre-processor instead of the compiler, you'll
 253  * have to open-code it.
 254  */
 255 #undef MIN
 256 #define MIN(a, b)                                       \
 257     ({                                                  \
 258         typeof(1 ? (a) : (b)) _a = (a), _b = (b);       \
 259         _a < _b ? _a : _b;                              \
 260     })
 261 #define MIN_CONST(a, b)                                         \
 262     __builtin_choose_expr(                                      \
 263         __builtin_constant_p(a) && __builtin_constant_p(b),     \
 264         (a) < (b) ? (a) : (b),                                  \
 265         ((void)0))
 266 #undef MAX
 267 #define MAX(a, b)                                       \
 268     ({                                                  \
 269         typeof(1 ? (a) : (b)) _a = (a), _b = (b);       \
 270         _a > _b ? _a : _b;                              \
 271     })
 272 #define MAX_CONST(a, b)                                         \
 273     __builtin_choose_expr(                                      \
 274         __builtin_constant_p(a) && __builtin_constant_p(b),     \
 275         (a) > (b) ? (a) : (b),                                  \
 276         ((void)0))
 277
 278 /*
 279  * Minimum function that returns zero only if both values are zero.
 280  * Intended for use with unsigned values only.
 281  */
 282 #ifndef MIN_NON_ZERO
 283 #define MIN_NON_ZERO(a, b)                              \
 284     ({                                                  \
 285         typeof(1 ? (a) : (b)) _a = (a), _b = (b);       \
 286         _a == 0 ? _b : (_b == 0 || _b > _a) ? _a : _b;  \
 287     })
 288 #endif
 289
 290 /* Round number down to multiple */
 291 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 292
 293 /* Round number up to multiple. Safe when m is not a power of 2 (see
 294  * ROUND_UP for a faster version when a power of 2 is guaranteed) */
 295 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 296
 297 /* Check if n is a multiple of m */
 298 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)
 299
 300 /* n-byte align pointer down */
 301 #define QEMU_ALIGN_PTR_DOWN(p, n) \
 302     ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
 303
 304 /* n-byte align pointer up */
 305 #define QEMU_ALIGN_PTR_UP(p, n) \
 306     ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))
 307
 308 /* Check if pointer p is n-bytes aligned */
 309 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
 310
 311 /* Round number up to multiple. Requires that d be a power of 2 (see
 312  * QEMU_ALIGN_UP for a safer but slower version on arbitrary
 313  * numbers); works even if d is a smaller type than n.  */
 314 #ifndef ROUND_UP
 315 #define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d)))
 316 #endif
 317
 318 #ifndef DIV_ROUND_UP
 319 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
 320 #endif
 321
 322 /*
 323  * &(x)[0] is always a pointer - if it's same type as x then the argument is a
 324  * pointer, not an array.
 325  */
 326 #define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \
 327                                                         typeof(&(x)[0])))
 328 #ifndef ARRAY_SIZE
 329 #define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \
 330                        QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x)))
 331 #endif
 332
 333 int qemu_daemon(int nochdir, int noclose);
 334 void *qemu_try_memalign(size_t alignment, size_t size);
 335 void *qemu_memalign(size_t alignment, size_t size);
 336 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared);
 337 void qemu_vfree(void *ptr);
 338 void qemu_anon_ram_free(void *ptr, size_t size);
 339
 340 #define QEMU_MADV_INVALID -1
 341
 342 #if defined(CONFIG_MADVISE)
 343
 344 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
 345 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
 346 #ifdef MADV_DONTFORK
 347 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
 348 #else
 349 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 350 #endif
 351 #ifdef MADV_MERGEABLE
 352 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 353 #else
 354 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 355 #endif
 356 #ifdef MADV_UNMERGEABLE
 357 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
 358 #else
 359 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 360 #endif
 361 #ifdef MADV_DODUMP
 362 #define QEMU_MADV_DODUMP MADV_DODUMP
 363 #else
 364 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 365 #endif
 366 #ifdef MADV_DONTDUMP
 367 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
 368 #else
 369 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 370 #endif
 371 #ifdef MADV_HUGEPAGE
 372 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
 373 #else
 374 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
 375 #endif
 376 #ifdef MADV_NOHUGEPAGE
 377 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
 378 #else
 379 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
 380 #endif
 381 #ifdef MADV_REMOVE
 382 #define QEMU_MADV_REMOVE MADV_REMOVE
 383 #else
 384 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 385 #endif
 386
 387 #elif defined(CONFIG_POSIX_MADVISE)
 388
 389 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 390 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 391 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 392 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 393 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 394 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 395 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 396 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 397 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 398 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 399
 400 #else /* no-op */
 401
 402 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 403 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 404 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 405 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 406 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 407 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 408 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 409 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 410 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 411 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 412
 413 #endif
 414
 415 #ifdef _WIN32
 416 #define HAVE_CHARDEV_SERIAL 1
 417 #elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__)    \
 418     || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
 419     || defined(__GLIBC__) || defined(__APPLE__)
 420 #define HAVE_CHARDEV_SERIAL 1
 421 #endif
 422
 423 #if defined(__linux__) || defined(__FreeBSD__) ||               \
 424     defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 425 #define HAVE_CHARDEV_PARPORT 1
 426 #endif
 427
 428 #if defined(CONFIG_LINUX)
 429 #ifndef BUS_MCEERR_AR
 430 #define BUS_MCEERR_AR 4
 431 #endif
 432 #ifndef BUS_MCEERR_AO
 433 #define BUS_MCEERR_AO 5
 434 #endif
 435 #endif
 436
 437 #if defined(__linux__) && \
 438     (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
 439      || defined(__powerpc64__))
 440    /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
 441       Valgrind does not support alignments larger than 1 MiB,
 442       therefore we need special code which handles running on Valgrind. */
 443 #  define QEMU_VMALLOC_ALIGN (512 * 4096)
 444 #elif defined(__linux__) && defined(__s390x__)
 445    /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
 446 #  define QEMU_VMALLOC_ALIGN (256 * 4096)
 447 #elif defined(__linux__) && defined(__sparc__)
 448 #include <sys/shm.h>
 449 #  define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size, SHMLBA)
 450 #else
 451 #  define QEMU_VMALLOC_ALIGN qemu_real_host_page_size
 452 #endif
 453
 454 #ifdef CONFIG_POSIX
 455 struct qemu_signalfd_siginfo {
 456     uint32_t ssi_signo;   /* Signal number */
 457     int32_t  ssi_errno;   /* Error number (unused) */
 458     int32_t  ssi_code;    /* Signal code */
 459     uint32_t ssi_pid;     /* PID of sender */
 460     uint32_t ssi_uid;     /* Real UID of sender */
 461     int32_t  ssi_fd;      /* File descriptor (SIGIO) */
 462     uint32_t ssi_tid;     /* Kernel timer ID (POSIX timers) */
 463     uint32_t ssi_band;    /* Band event (SIGIO) */
 464     uint32_t ssi_overrun; /* POSIX timer overrun count */
 465     uint32_t ssi_trapno;  /* Trap number that caused signal */
 466     int32_t  ssi_status;  /* Exit status or signal (SIGCHLD) */
 467     int32_t  ssi_int;     /* Integer sent by sigqueue(2) */
 468     uint64_t ssi_ptr;     /* Pointer sent by sigqueue(2) */
 469     uint64_t ssi_utime;   /* User CPU time consumed (SIGCHLD) */
 470     uint64_t ssi_stime;   /* System CPU time consumed (SIGCHLD) */
 471     uint64_t ssi_addr;    /* Address that generated signal
 472                              (for hardware-generated signals) */
 473     uint8_t  pad[48];     /* Pad size to 128 bytes (allow for
 474                              additional fields in the future) */
 475 };
 476
 477 int qemu_signalfd(const sigset_t *mask);
 478 void sigaction_invoke(struct sigaction *action,
 479                       struct qemu_signalfd_siginfo *info);
 480 #endif
 481
 482 int qemu_madvise(void *addr, size_t len, int advice);
 483 int qemu_mprotect_rwx(void *addr, size_t size);
 484 int qemu_mprotect_none(void *addr, size_t size);
 485
 486 int qemu_open(const char *name, int flags, ...);
 487 int qemu_close(int fd);
 488 int qemu_unlink(const char *name);
 489 #ifndef _WIN32
 490 int qemu_dup(int fd);
 491 #endif
 492 int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
 493 int qemu_unlock_fd(int fd, int64_t start, int64_t len);
 494 int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive);
 495 bool qemu_has_ofd_lock(void);
 496
 497 #if defined(__HAIKU__) && defined(__i386__)
 498 #define FMT_pid "%ld"
 499 #elif defined(WIN64)
 500 #define FMT_pid "%" PRId64
 501 #else
 502 #define FMT_pid "%d"
 503 #endif
 504
 505 bool qemu_write_pidfile(const char *pidfile, Error **errp);
 506
 507 int qemu_get_thread_id(void);
 508
 509 #ifndef CONFIG_IOVEC
 510 struct iovec {
 511     void *iov_base;
 512     size_t iov_len;
 513 };
 514 /*
 515  * Use the same value as Linux for now.
 516  */
 517 #define IOV_MAX 1024
 518
 519 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
 520 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
 521 #else
 522 #include <sys/uio.h>
 523 #endif
 524
 525 #ifdef _WIN32
 526 static inline void qemu_timersub(const struct timeval *val1,
 527                                  const struct timeval *val2,
 528                                  struct timeval *res)
 529 {
 530     res->tv_sec = val1->tv_sec - val2->tv_sec;
 531     if (val1->tv_usec < val2->tv_usec) {
 532         res->tv_sec--;
 533         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
 534     } else {
 535         res->tv_usec = val1->tv_usec - val2->tv_usec;
 536     }
 537 }
 538 #else
 539 #define qemu_timersub timersub
 540 #endif
 541
 542 void qemu_set_cloexec(int fd);
 543
 544 /* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
 545  * instead of QEMU_VERSION, so setting hw_version on MachineClass
 546  * is no longer mandatory.
 547  *
 548  * Do NOT change this string, or it will break compatibility on all
 549  * machine classes that don't set hw_version.
 550  */
 551 #define QEMU_HW_VERSION "2.5+"
 552
 553 /* QEMU "hardware version" setting. Used to replace code that exposed
 554  * QEMU_VERSION to guests in the past and need to keep compatibility.
 555  * Do not use qemu_hw_version() in new code.
 556  */
 557 void qemu_set_hw_version(const char *);
 558 const char *qemu_hw_version(void);
 559
 560 void fips_set_state(bool requested);
 561 bool fips_get_state(void);
 562
 563 /* Return a dynamically allocated pathname denoting a file or directory that is
 564  * appropriate for storing local state.
 565  *
 566  * @relative_pathname need not start with a directory separator; one will be
 567  * added automatically.
 568  *
 569  * The caller is responsible for releasing the value returned with g_free()
 570  * after use.
 571  */
 572 char *qemu_get_local_state_pathname(const char *relative_pathname);
 573
 574 /* Find program directory, and save it for later usage with
 575  * qemu_get_exec_dir().
 576  * Try OS specific API first, if not working, parse from argv0. */
 577 void qemu_init_exec_dir(const char *argv0);
 578
 579 /* Get the saved exec dir.
 580  * Caller needs to release the returned string by g_free() */
 581 char *qemu_get_exec_dir(void);
 582
 583 /**
 584  * qemu_getauxval:
 585  * @type: the auxiliary vector key to lookup
 586  *
 587  * Search the auxiliary vector for @type, returning the value
 588  * or 0 if @type is not present.
 589  */
 590 unsigned long qemu_getauxval(unsigned long type);
 591
 592 void qemu_set_tty_echo(int fd, bool echo);
 593
 594 void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
 595                      Error **errp);
 596
 597 /**
 598  * qemu_get_pid_name:
 599  * @pid: pid of a process
 600  *
 601  * For given @pid fetch its name. Caller is responsible for
 602  * freeing the string when no longer needed.
 603  * Returns allocated string on success, NULL on failure.
 604  */
 605 char *qemu_get_pid_name(pid_t pid);
 606
 607 /**
 608  * qemu_fork:
 609  *
 610  * A version of fork that avoids signal handler race
 611  * conditions that can lead to child process getting
 612  * signals that are otherwise only expected by the
 613  * parent. It also resets all signal handlers to the
 614  * default settings.
 615  *
 616  * Returns 0 to child process, pid number to parent
 617  * or -1 on failure.
 618  */
 619 pid_t qemu_fork(Error **errp);
 620
 621 /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
 622  * when intptr_t is 32-bit and we are aligning a long long.
 623  */
 624 extern uintptr_t qemu_real_host_page_size;
 625 extern intptr_t qemu_real_host_page_mask;
 626
 627 extern int qemu_icache_linesize;
 628 extern int qemu_icache_linesize_log;
 629 extern int qemu_dcache_linesize;
 630 extern int qemu_dcache_linesize_log;
 631
 632 /*
 633  * After using getopt or getopt_long, if you need to parse another set
 634  * of options, then you must reset optind.  Unfortunately the way to
 635  * do this varies between implementations of getopt.
 636  */
 637 static inline void qemu_reset_optind(void)
 638 {
 639 #ifdef HAVE_OPTRESET
 640     optind = 1;
 641     optreset = 1;
 642 #else
 643     optind = 0;
 644 #endif
 645 }
 646
 647 #endif