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 #ifdef __COVERITY__ 37 /* Coverity does not like the new _Float* types that are used by 38 * recent glibc, and croaks on every single file that includes 39 * stdlib.h. These typedefs are enough to please it. 40 * 41 * Note that these fix parse errors so they cannot be placed in 42 * scripts/coverity-model.c. 43 */ 44 typedef float _Float32; 45 typedef double _Float32x; 46 typedef double _Float64; 47 typedef __float80 _Float64x; 48 typedef __float128 _Float128; 49 #endif 50 51 #include "qemu/compiler.h" 52 53 /* Older versions of C++ don't get definitions of various macros from 54 * stdlib.h unless we define these macros before first inclusion of 55 * that system header. 56 */ 57 #ifndef __STDC_CONSTANT_MACROS 58 #define __STDC_CONSTANT_MACROS 59 #endif 60 #ifndef __STDC_LIMIT_MACROS 61 #define __STDC_LIMIT_MACROS 62 #endif 63 #ifndef __STDC_FORMAT_MACROS 64 #define __STDC_FORMAT_MACROS 65 #endif 66 67 /* The following block of code temporarily renames the daemon() function so the 68 * compiler does not see the warning associated with it in stdlib.h on OSX 69 */ 70 #ifdef __APPLE__ 71 #define daemon qemu_fake_daemon_function 72 #include <stdlib.h> 73 #undef daemon 74 extern int daemon(int, int); 75 #endif 76 77 #ifdef _WIN32 78 /* as defined in sdkddkver.h */ 79 #ifndef _WIN32_WINNT 80 #define _WIN32_WINNT 0x0600 /* Vista */ 81 #endif 82 /* reduces the number of implicitly included headers */ 83 #ifndef WIN32_LEAN_AND_MEAN 84 #define WIN32_LEAN_AND_MEAN 85 #endif 86 #endif 87 88 /* enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later) */ 89 #ifdef __MINGW32__ 90 #define __USE_MINGW_ANSI_STDIO 1 91 #endif 92 93 #include <stdarg.h> 94 #include <stddef.h> 95 #include <stdbool.h> 96 #include <stdint.h> 97 #include <sys/types.h> 98 #include <stdlib.h> 99 #include <stdio.h> 100 101 #include <string.h> 102 #include <strings.h> 103 #include <inttypes.h> 104 #include <limits.h> 105 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r 106 * function availability on recentish Mingw-w64 platforms. */ 107 #include <unistd.h> 108 #include <time.h> 109 #include <ctype.h> 110 #include <errno.h> 111 #include <fcntl.h> 112 #include <getopt.h> 113 #include <sys/stat.h> 114 #include <sys/time.h> 115 #include <assert.h> 116 /* setjmp must be declared before sysemu/os-win32.h 117 * because it is redefined there. */ 118 #include <setjmp.h> 119 #include <signal.h> 120 121 #ifdef __OpenBSD__ 122 #include <sys/signal.h> 123 #endif 124 125 #ifndef _WIN32 126 #include <sys/wait.h> 127 #else 128 #define WIFEXITED(x) 1 129 #define WEXITSTATUS(x) (x) 130 #endif 131 132 #ifdef _WIN32 133 #include "sysemu/os-win32.h" 134 #endif 135 136 #ifdef CONFIG_POSIX 137 #include "sysemu/os-posix.h" 138 #endif 139 140 #include "glib-compat.h" 141 #include "qemu/typedefs.h" 142 143 /* 144 * For mingw, as of v6.0.0, the function implementing the assert macro is 145 * not marked as noreturn, so the compiler cannot delete code following an 146 * assert(false) as unused. We rely on this within the code base to delete 147 * code that is unreachable when features are disabled. 148 * All supported versions of Glib's g_assert() satisfy this requirement. 149 */ 150 #ifdef __MINGW32__ 151 #undef assert 152 #define assert(x) g_assert(x) 153 #endif 154 155 /* 156 * According to waitpid man page: 157 * WCOREDUMP 158 * This macro is not specified in POSIX.1-2001 and is not 159 * available on some UNIX implementations (e.g., AIX, SunOS). 160 * Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif. 161 */ 162 #ifndef WCOREDUMP 163 #define WCOREDUMP(status) 0 164 #endif 165 /* 166 * We have a lot of unaudited code that may fail in strange ways, or 167 * even be a security risk during migration, if you disable assertions 168 * at compile-time. You may comment out these safety checks if you 169 * absolutely want to disable assertion overhead, but it is not 170 * supported upstream so the risk is all yours. Meanwhile, please 171 * submit patches to remove any side-effects inside an assertion, or 172 * fixing error handling that should use Error instead of assert. 173 */ 174 #ifdef NDEBUG 175 #error building with NDEBUG is not supported 176 #endif 177 #ifdef G_DISABLE_ASSERT 178 #error building with G_DISABLE_ASSERT is not supported 179 #endif 180 181 #ifndef O_LARGEFILE 182 #define O_LARGEFILE 0 183 #endif 184 #ifndef O_BINARY 185 #define O_BINARY 0 186 #endif 187 #ifndef MAP_ANONYMOUS 188 #define MAP_ANONYMOUS MAP_ANON 189 #endif 190 #ifndef ENOMEDIUM 191 #define ENOMEDIUM ENODEV 192 #endif 193 #if !defined(ENOTSUP) 194 #define ENOTSUP 4096 195 #endif 196 #if !defined(ECANCELED) 197 #define ECANCELED 4097 198 #endif 199 #if !defined(EMEDIUMTYPE) 200 #define EMEDIUMTYPE 4098 201 #endif 202 #if !defined(ESHUTDOWN) 203 #define ESHUTDOWN 4099 204 #endif 205 206 /* time_t may be either 32 or 64 bits depending on the host OS, and 207 * can be either signed or unsigned, so we can't just hardcode a 208 * specific maximum value. This is not a C preprocessor constant, 209 * so you can't use TIME_MAX in an #ifdef, but for our purposes 210 * this isn't a problem. 211 */ 212 213 /* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from 214 * Gnulib, and are under the LGPL v2.1 or (at your option) any 215 * later version. 216 */ 217 218 /* True if the real type T is signed. */ 219 #define TYPE_SIGNED(t) (!((t)0 < (t)-1)) 220 221 /* The width in bits of the integer type or expression T. 222 * Padding bits are not supported. 223 */ 224 #define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT) 225 226 /* The maximum and minimum values for the integer type T. */ 227 #define TYPE_MAXIMUM(t) \ 228 ((t) (!TYPE_SIGNED(t) \ 229 ? (t)-1 \ 230 : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1))) 231 232 #ifndef TIME_MAX 233 #define TIME_MAX TYPE_MAXIMUM(time_t) 234 #endif 235 236 /* HOST_LONG_BITS is the size of a native pointer in bits. */ 237 #if UINTPTR_MAX == UINT32_MAX 238 # define HOST_LONG_BITS 32 239 #elif UINTPTR_MAX == UINT64_MAX 240 # define HOST_LONG_BITS 64 241 #else 242 # error Unknown pointer size 243 #endif 244 245 /* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with 246 * the wrong type. Our replacement isn't usable in preprocessor 247 * expressions, but it is sufficient for our needs. */ 248 #if defined(HAVE_BROKEN_SIZE_MAX) && HAVE_BROKEN_SIZE_MAX 249 #undef SIZE_MAX 250 #define SIZE_MAX ((size_t)-1) 251 #endif 252 253 #ifndef MIN 254 #define MIN(a, b) (((a) < (b)) ? (a) : (b)) 255 #endif 256 #ifndef MAX 257 #define MAX(a, b) (((a) > (b)) ? (a) : (b)) 258 #endif 259 260 /* Minimum function that returns zero only iff both values are zero. 261 * Intended for use with unsigned values only. */ 262 #ifndef MIN_NON_ZERO 263 #define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \ 264 ((b) == 0 ? (a) : (MIN(a, b)))) 265 #endif 266 267 /* Round number down to multiple */ 268 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m)) 269 270 /* Round number up to multiple. Safe when m is not a power of 2 (see 271 * ROUND_UP for a faster version when a power of 2 is guaranteed) */ 272 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m)) 273 274 /* Check if n is a multiple of m */ 275 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0) 276 277 /* n-byte align pointer down */ 278 #define QEMU_ALIGN_PTR_DOWN(p, n) \ 279 ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n))) 280 281 /* n-byte align pointer up */ 282 #define QEMU_ALIGN_PTR_UP(p, n) \ 283 ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n))) 284 285 /* Check if pointer p is n-bytes aligned */ 286 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n)) 287 288 /* Round number up to multiple. Requires that d be a power of 2 (see 289 * QEMU_ALIGN_UP for a safer but slower version on arbitrary 290 * numbers); works even if d is a smaller type than n. */ 291 #ifndef ROUND_UP 292 #define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d))) 293 #endif 294 295 #ifndef DIV_ROUND_UP 296 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 297 #endif 298 299 /* 300 * &(x)[0] is always a pointer - if it's same type as x then the argument is a 301 * pointer, not an array. 302 */ 303 #define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \ 304 typeof(&(x)[0]))) 305 #ifndef ARRAY_SIZE 306 #define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \ 307 QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x))) 308 #endif 309 310 int qemu_daemon(int nochdir, int noclose); 311 void *qemu_try_memalign(size_t alignment, size_t size); 312 void *qemu_memalign(size_t alignment, size_t size); 313 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared); 314 void qemu_vfree(void *ptr); 315 void qemu_anon_ram_free(void *ptr, size_t size); 316 317 #define QEMU_MADV_INVALID -1 318 319 #if defined(CONFIG_MADVISE) 320 321 #define QEMU_MADV_WILLNEED MADV_WILLNEED 322 #define QEMU_MADV_DONTNEED MADV_DONTNEED 323 #ifdef MADV_DONTFORK 324 #define QEMU_MADV_DONTFORK MADV_DONTFORK 325 #else 326 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID 327 #endif 328 #ifdef MADV_MERGEABLE 329 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE 330 #else 331 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID 332 #endif 333 #ifdef MADV_UNMERGEABLE 334 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE 335 #else 336 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID 337 #endif 338 #ifdef MADV_DODUMP 339 #define QEMU_MADV_DODUMP MADV_DODUMP 340 #else 341 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID 342 #endif 343 #ifdef MADV_DONTDUMP 344 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP 345 #else 346 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID 347 #endif 348 #ifdef MADV_HUGEPAGE 349 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE 350 #else 351 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID 352 #endif 353 #ifdef MADV_NOHUGEPAGE 354 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE 355 #else 356 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID 357 #endif 358 #ifdef MADV_REMOVE 359 #define QEMU_MADV_REMOVE MADV_REMOVE 360 #else 361 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID 362 #endif 363 364 #elif defined(CONFIG_POSIX_MADVISE) 365 366 #define QEMU_MADV_WILLNEED POSIX_MADV_WILLNEED 367 #define QEMU_MADV_DONTNEED POSIX_MADV_DONTNEED 368 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID 369 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID 370 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID 371 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID 372 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID 373 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID 374 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID 375 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID 376 377 #else /* no-op */ 378 379 #define QEMU_MADV_WILLNEED QEMU_MADV_INVALID 380 #define QEMU_MADV_DONTNEED QEMU_MADV_INVALID 381 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID 382 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID 383 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID 384 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID 385 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID 386 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID 387 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID 388 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID 389 390 #endif 391 392 #ifdef _WIN32 393 #define HAVE_CHARDEV_SERIAL 1 394 #elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \ 395 || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \ 396 || defined(__GLIBC__) 397 #define HAVE_CHARDEV_SERIAL 1 398 #endif 399 400 #if defined(__linux__) || defined(__FreeBSD__) || \ 401 defined(__FreeBSD_kernel__) || defined(__DragonFly__) 402 #define HAVE_CHARDEV_PARPORT 1 403 #endif 404 405 #if defined(CONFIG_LINUX) 406 #ifndef BUS_MCEERR_AR 407 #define BUS_MCEERR_AR 4 408 #endif 409 #ifndef BUS_MCEERR_AO 410 #define BUS_MCEERR_AO 5 411 #endif 412 #endif 413 414 #if defined(__linux__) && \ 415 (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \ 416 || defined(__powerpc64__)) 417 /* Use 2 MiB alignment so transparent hugepages can be used by KVM. 418 Valgrind does not support alignments larger than 1 MiB, 419 therefore we need special code which handles running on Valgrind. */ 420 # define QEMU_VMALLOC_ALIGN (512 * 4096) 421 #elif defined(__linux__) && defined(__s390x__) 422 /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ 423 # define QEMU_VMALLOC_ALIGN (256 * 4096) 424 #elif defined(__linux__) && defined(__sparc__) 425 #include <sys/shm.h> 426 # define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size, SHMLBA) 427 #else 428 # define QEMU_VMALLOC_ALIGN qemu_real_host_page_size 429 #endif 430 431 #ifdef CONFIG_POSIX 432 struct qemu_signalfd_siginfo { 433 uint32_t ssi_signo; /* Signal number */ 434 int32_t ssi_errno; /* Error number (unused) */ 435 int32_t ssi_code; /* Signal code */ 436 uint32_t ssi_pid; /* PID of sender */ 437 uint32_t ssi_uid; /* Real UID of sender */ 438 int32_t ssi_fd; /* File descriptor (SIGIO) */ 439 uint32_t ssi_tid; /* Kernel timer ID (POSIX timers) */ 440 uint32_t ssi_band; /* Band event (SIGIO) */ 441 uint32_t ssi_overrun; /* POSIX timer overrun count */ 442 uint32_t ssi_trapno; /* Trap number that caused signal */ 443 int32_t ssi_status; /* Exit status or signal (SIGCHLD) */ 444 int32_t ssi_int; /* Integer sent by sigqueue(2) */ 445 uint64_t ssi_ptr; /* Pointer sent by sigqueue(2) */ 446 uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */ 447 uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */ 448 uint64_t ssi_addr; /* Address that generated signal 449 (for hardware-generated signals) */ 450 uint8_t pad[48]; /* Pad size to 128 bytes (allow for 451 additional fields in the future) */ 452 }; 453 454 int qemu_signalfd(const sigset_t *mask); 455 void sigaction_invoke(struct sigaction *action, 456 struct qemu_signalfd_siginfo *info); 457 #endif 458 459 int qemu_madvise(void *addr, size_t len, int advice); 460 int qemu_mprotect_rwx(void *addr, size_t size); 461 int qemu_mprotect_none(void *addr, size_t size); 462 463 int qemu_open(const char *name, int flags, ...); 464 int qemu_close(int fd); 465 int qemu_unlink(const char *name); 466 #ifndef _WIN32 467 int qemu_dup(int fd); 468 #endif 469 int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive); 470 int qemu_unlock_fd(int fd, int64_t start, int64_t len); 471 int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive); 472 bool qemu_has_ofd_lock(void); 473 474 #if defined(__HAIKU__) && defined(__i386__) 475 #define FMT_pid "%ld" 476 #elif defined(WIN64) 477 #define FMT_pid "%" PRId64 478 #else 479 #define FMT_pid "%d" 480 #endif 481 482 bool qemu_write_pidfile(const char *pidfile, Error **errp); 483 484 int qemu_get_thread_id(void); 485 486 #ifndef CONFIG_IOVEC 487 struct iovec { 488 void *iov_base; 489 size_t iov_len; 490 }; 491 /* 492 * Use the same value as Linux for now. 493 */ 494 #define IOV_MAX 1024 495 496 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt); 497 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt); 498 #else 499 #include <sys/uio.h> 500 #endif 501 502 #ifdef _WIN32 503 static inline void qemu_timersub(const struct timeval *val1, 504 const struct timeval *val2, 505 struct timeval *res) 506 { 507 res->tv_sec = val1->tv_sec - val2->tv_sec; 508 if (val1->tv_usec < val2->tv_usec) { 509 res->tv_sec--; 510 res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000; 511 } else { 512 res->tv_usec = val1->tv_usec - val2->tv_usec; 513 } 514 } 515 #else 516 #define qemu_timersub timersub 517 #endif 518 519 void qemu_set_cloexec(int fd); 520 521 /* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default 522 * instead of QEMU_VERSION, so setting hw_version on MachineClass 523 * is no longer mandatory. 524 * 525 * Do NOT change this string, or it will break compatibility on all 526 * machine classes that don't set hw_version. 527 */ 528 #define QEMU_HW_VERSION "2.5+" 529 530 /* QEMU "hardware version" setting. Used to replace code that exposed 531 * QEMU_VERSION to guests in the past and need to keep compatibility. 532 * Do not use qemu_hw_version() in new code. 533 */ 534 void qemu_set_hw_version(const char *); 535 const char *qemu_hw_version(void); 536 537 void fips_set_state(bool requested); 538 bool fips_get_state(void); 539 540 /* Return a dynamically allocated pathname denoting a file or directory that is 541 * appropriate for storing local state. 542 * 543 * @relative_pathname need not start with a directory separator; one will be 544 * added automatically. 545 * 546 * The caller is responsible for releasing the value returned with g_free() 547 * after use. 548 */ 549 char *qemu_get_local_state_pathname(const char *relative_pathname); 550 551 /* Find program directory, and save it for later usage with 552 * qemu_get_exec_dir(). 553 * Try OS specific API first, if not working, parse from argv0. */ 554 void qemu_init_exec_dir(const char *argv0); 555 556 /* Get the saved exec dir. 557 * Caller needs to release the returned string by g_free() */ 558 char *qemu_get_exec_dir(void); 559 560 /** 561 * qemu_getauxval: 562 * @type: the auxiliary vector key to lookup 563 * 564 * Search the auxiliary vector for @type, returning the value 565 * or 0 if @type is not present. 566 */ 567 unsigned long qemu_getauxval(unsigned long type); 568 569 void qemu_set_tty_echo(int fd, bool echo); 570 571 void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus, 572 Error **errp); 573 574 /** 575 * qemu_get_pid_name: 576 * @pid: pid of a process 577 * 578 * For given @pid fetch its name. Caller is responsible for 579 * freeing the string when no longer needed. 580 * Returns allocated string on success, NULL on failure. 581 */ 582 char *qemu_get_pid_name(pid_t pid); 583 584 /** 585 * qemu_fork: 586 * 587 * A version of fork that avoids signal handler race 588 * conditions that can lead to child process getting 589 * signals that are otherwise only expected by the 590 * parent. It also resets all signal handlers to the 591 * default settings. 592 * 593 * Returns 0 to child process, pid number to parent 594 * or -1 on failure. 595 */ 596 pid_t qemu_fork(Error **errp); 597 598 /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even 599 * when intptr_t is 32-bit and we are aligning a long long. 600 */ 601 extern uintptr_t qemu_real_host_page_size; 602 extern intptr_t qemu_real_host_page_mask; 603 604 extern int qemu_icache_linesize; 605 extern int qemu_icache_linesize_log; 606 extern int qemu_dcache_linesize; 607 extern int qemu_dcache_linesize_log; 608 609 /* 610 * After using getopt or getopt_long, if you need to parse another set 611 * of options, then you must reset optind. Unfortunately the way to 612 * do this varies between implementations of getopt. 613 */ 614 static inline void qemu_reset_optind(void) 615 { 616 #ifdef HAVE_OPTRESET 617 optind = 1; 618 optreset = 1; 619 #else 620 optind = 0; 621 #endif 622 } 623 624 #endif 625