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 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 QEMU_EXTERN_C 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 CONFIG_IOVEC 108 #include <sys/uio.h> 109 #endif 110 111 #if defined(__linux__) && defined(__sparc__) 112 /* The SPARC definition of QEMU_VMALLOC_ALIGN needs SHMLBA */ 113 #include <sys/shm.h> 114 #endif 115 116 #ifndef _WIN32 117 #include <sys/wait.h> 118 #else 119 #define WIFEXITED(x) 1 120 #define WEXITSTATUS(x) (x) 121 #endif 122 123 #ifdef __APPLE__ 124 #include <AvailabilityMacros.h> 125 #endif 126 127 /* 128 * This is somewhat like a system header; it must be outside any extern "C" 129 * block because it includes system headers itself, including glib.h, 130 * which will not compile if inside an extern "C" block. 131 */ 132 #include "glib-compat.h" 133 134 #ifdef _WIN32 135 #include "sysemu/os-win32.h" 136 #endif 137 138 #ifdef CONFIG_POSIX 139 #include "sysemu/os-posix.h" 140 #endif 141 142 #ifdef __cplusplus 143 extern "C" { 144 #endif 145 146 #include "qemu/typedefs.h" 147 148 /* 149 * For mingw, as of v6.0.0, the function implementing the assert macro is 150 * not marked as noreturn, so the compiler cannot delete code following an 151 * assert(false) as unused. We rely on this within the code base to delete 152 * code that is unreachable when features are disabled. 153 * All supported versions of Glib's g_assert() satisfy this requirement. 154 */ 155 #ifdef __MINGW32__ 156 #undef assert 157 #define assert(x) g_assert(x) 158 #endif 159 160 /* 161 * According to waitpid man page: 162 * WCOREDUMP 163 * This macro is not specified in POSIX.1-2001 and is not 164 * available on some UNIX implementations (e.g., AIX, SunOS). 165 * Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif. 166 */ 167 #ifndef WCOREDUMP 168 #define WCOREDUMP(status) 0 169 #endif 170 /* 171 * We have a lot of unaudited code that may fail in strange ways, or 172 * even be a security risk during migration, if you disable assertions 173 * at compile-time. You may comment out these safety checks if you 174 * absolutely want to disable assertion overhead, but it is not 175 * supported upstream so the risk is all yours. Meanwhile, please 176 * submit patches to remove any side-effects inside an assertion, or 177 * fixing error handling that should use Error instead of assert. 178 */ 179 #ifdef NDEBUG 180 #error building with NDEBUG is not supported 181 #endif 182 #ifdef G_DISABLE_ASSERT 183 #error building with G_DISABLE_ASSERT is not supported 184 #endif 185 186 #ifndef O_LARGEFILE 187 #define O_LARGEFILE 0 188 #endif 189 #ifndef O_BINARY 190 #define O_BINARY 0 191 #endif 192 #ifndef MAP_ANONYMOUS 193 #define MAP_ANONYMOUS MAP_ANON 194 #endif 195 #ifndef MAP_FIXED_NOREPLACE 196 #define MAP_FIXED_NOREPLACE 0 197 #endif 198 #ifndef ENOMEDIUM 199 #define ENOMEDIUM ENODEV 200 #endif 201 #if !defined(ENOTSUP) 202 #define ENOTSUP 4096 203 #endif 204 #if !defined(ECANCELED) 205 #define ECANCELED 4097 206 #endif 207 #if !defined(EMEDIUMTYPE) 208 #define EMEDIUMTYPE 4098 209 #endif 210 #if !defined(ESHUTDOWN) 211 #define ESHUTDOWN 4099 212 #endif 213 214 /* time_t may be either 32 or 64 bits depending on the host OS, and 215 * can be either signed or unsigned, so we can't just hardcode a 216 * specific maximum value. This is not a C preprocessor constant, 217 * so you can't use TIME_MAX in an #ifdef, but for our purposes 218 * this isn't a problem. 219 */ 220 221 /* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from 222 * Gnulib, and are under the LGPL v2.1 or (at your option) any 223 * later version. 224 */ 225 226 /* True if the real type T is signed. */ 227 #define TYPE_SIGNED(t) (!((t)0 < (t)-1)) 228 229 /* The width in bits of the integer type or expression T. 230 * Padding bits are not supported. 231 */ 232 #define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT) 233 234 /* The maximum and minimum values for the integer type T. */ 235 #define TYPE_MAXIMUM(t) \ 236 ((t) (!TYPE_SIGNED(t) \ 237 ? (t)-1 \ 238 : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1))) 239 240 #ifndef TIME_MAX 241 #define TIME_MAX TYPE_MAXIMUM(time_t) 242 #endif 243 244 /* HOST_LONG_BITS is the size of a native pointer in bits. */ 245 #if UINTPTR_MAX == UINT32_MAX 246 # define HOST_LONG_BITS 32 247 #elif UINTPTR_MAX == UINT64_MAX 248 # define HOST_LONG_BITS 64 249 #else 250 # error Unknown pointer size 251 #endif 252 253 /* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with 254 * the wrong type. Our replacement isn't usable in preprocessor 255 * expressions, but it is sufficient for our needs. */ 256 #if defined(HAVE_BROKEN_SIZE_MAX) && HAVE_BROKEN_SIZE_MAX 257 #undef SIZE_MAX 258 #define SIZE_MAX ((size_t)-1) 259 #endif 260 261 /* 262 * Two variations of MIN/MAX macros. The first is for runtime use, and 263 * evaluates arguments only once (so it is safe even with side 264 * effects), but will not work in constant contexts (such as array 265 * size declarations) because of the '{}'. The second is for constant 266 * expression use, where evaluating arguments twice is safe because 267 * the result is going to be constant anyway, but will not work in a 268 * runtime context because of a void expression where a value is 269 * expected. Thus, both gcc and clang will fail to compile if you use 270 * the wrong macro (even if the error may seem a bit cryptic). 271 * 272 * Note that neither form is usable as an #if condition; if you truly 273 * need to write conditional code that depends on a minimum or maximum 274 * determined by the pre-processor instead of the compiler, you'll 275 * have to open-code it. Sadly, Coverity is severely confused by the 276 * constant variants, so we have to dumb things down there. 277 */ 278 #undef MIN 279 #define MIN(a, b) \ 280 ({ \ 281 typeof(1 ? (a) : (b)) _a = (a), _b = (b); \ 282 _a < _b ? _a : _b; \ 283 }) 284 #undef MAX 285 #define MAX(a, b) \ 286 ({ \ 287 typeof(1 ? (a) : (b)) _a = (a), _b = (b); \ 288 _a > _b ? _a : _b; \ 289 }) 290 291 #ifdef __COVERITY__ 292 # define MIN_CONST(a, b) ((a) < (b) ? (a) : (b)) 293 # define MAX_CONST(a, b) ((a) > (b) ? (a) : (b)) 294 #else 295 # define MIN_CONST(a, b) \ 296 __builtin_choose_expr( \ 297 __builtin_constant_p(a) && __builtin_constant_p(b), \ 298 (a) < (b) ? (a) : (b), \ 299 ((void)0)) 300 # define MAX_CONST(a, b) \ 301 __builtin_choose_expr( \ 302 __builtin_constant_p(a) && __builtin_constant_p(b), \ 303 (a) > (b) ? (a) : (b), \ 304 ((void)0)) 305 #endif 306 307 /* 308 * Minimum function that returns zero only if both values are zero. 309 * Intended for use with unsigned values only. 310 */ 311 #ifndef MIN_NON_ZERO 312 #define MIN_NON_ZERO(a, b) \ 313 ({ \ 314 typeof(1 ? (a) : (b)) _a = (a), _b = (b); \ 315 _a == 0 ? _b : (_b == 0 || _b > _a) ? _a : _b; \ 316 }) 317 #endif 318 319 /* Round number down to multiple */ 320 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m)) 321 322 /* Round number up to multiple. Safe when m is not a power of 2 (see 323 * ROUND_UP for a faster version when a power of 2 is guaranteed) */ 324 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m)) 325 326 /* Check if n is a multiple of m */ 327 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0) 328 329 /* n-byte align pointer down */ 330 #define QEMU_ALIGN_PTR_DOWN(p, n) \ 331 ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n))) 332 333 /* n-byte align pointer up */ 334 #define QEMU_ALIGN_PTR_UP(p, n) \ 335 ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n))) 336 337 /* Check if pointer p is n-bytes aligned */ 338 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n)) 339 340 /* Round number up to multiple. Requires that d be a power of 2 (see 341 * QEMU_ALIGN_UP for a safer but slower version on arbitrary 342 * numbers); works even if d is a smaller type than n. */ 343 #ifndef ROUND_UP 344 #define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d))) 345 #endif 346 347 #ifndef DIV_ROUND_UP 348 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 349 #endif 350 351 /* 352 * &(x)[0] is always a pointer - if it's same type as x then the argument is a 353 * pointer, not an array. 354 */ 355 #define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \ 356 typeof(&(x)[0]))) 357 #ifndef ARRAY_SIZE 358 #define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \ 359 QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x))) 360 #endif 361 362 int qemu_daemon(int nochdir, int noclose); 363 void *qemu_try_memalign(size_t alignment, size_t size); 364 void *qemu_memalign(size_t alignment, size_t size); 365 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared); 366 void qemu_vfree(void *ptr); 367 void qemu_anon_ram_free(void *ptr, size_t size); 368 369 #define QEMU_MADV_INVALID -1 370 371 #if defined(CONFIG_MADVISE) 372 373 #define QEMU_MADV_WILLNEED MADV_WILLNEED 374 #define QEMU_MADV_DONTNEED MADV_DONTNEED 375 #ifdef MADV_DONTFORK 376 #define QEMU_MADV_DONTFORK MADV_DONTFORK 377 #else 378 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID 379 #endif 380 #ifdef MADV_MERGEABLE 381 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE 382 #else 383 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID 384 #endif 385 #ifdef MADV_UNMERGEABLE 386 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE 387 #else 388 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID 389 #endif 390 #ifdef MADV_DODUMP 391 #define QEMU_MADV_DODUMP MADV_DODUMP 392 #else 393 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID 394 #endif 395 #ifdef MADV_DONTDUMP 396 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP 397 #else 398 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID 399 #endif 400 #ifdef MADV_HUGEPAGE 401 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE 402 #else 403 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID 404 #endif 405 #ifdef MADV_NOHUGEPAGE 406 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE 407 #else 408 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID 409 #endif 410 #ifdef MADV_REMOVE 411 #define QEMU_MADV_REMOVE MADV_REMOVE 412 #else 413 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID 414 #endif 415 416 #elif defined(CONFIG_POSIX_MADVISE) 417 418 #define QEMU_MADV_WILLNEED POSIX_MADV_WILLNEED 419 #define QEMU_MADV_DONTNEED POSIX_MADV_DONTNEED 420 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID 421 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID 422 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID 423 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID 424 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID 425 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID 426 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID 427 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID 428 429 #else /* no-op */ 430 431 #define QEMU_MADV_WILLNEED QEMU_MADV_INVALID 432 #define QEMU_MADV_DONTNEED QEMU_MADV_INVALID 433 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID 434 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID 435 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID 436 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID 437 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID 438 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID 439 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID 440 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID 441 442 #endif 443 444 #ifdef _WIN32 445 #define HAVE_CHARDEV_SERIAL 1 446 #elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \ 447 || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \ 448 || defined(__GLIBC__) || defined(__APPLE__) 449 #define HAVE_CHARDEV_SERIAL 1 450 #endif 451 452 #if defined(__linux__) || defined(__FreeBSD__) || \ 453 defined(__FreeBSD_kernel__) || defined(__DragonFly__) 454 #define HAVE_CHARDEV_PARPORT 1 455 #endif 456 457 #if defined(__HAIKU__) 458 #define SIGIO SIGPOLL 459 #endif 460 461 #if defined(CONFIG_LINUX) 462 #ifndef BUS_MCEERR_AR 463 #define BUS_MCEERR_AR 4 464 #endif 465 #ifndef BUS_MCEERR_AO 466 #define BUS_MCEERR_AO 5 467 #endif 468 #endif 469 470 #if defined(__linux__) && \ 471 (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \ 472 || defined(__powerpc64__)) 473 /* Use 2 MiB alignment so transparent hugepages can be used by KVM. 474 Valgrind does not support alignments larger than 1 MiB, 475 therefore we need special code which handles running on Valgrind. */ 476 # define QEMU_VMALLOC_ALIGN (512 * 4096) 477 #elif defined(__linux__) && defined(__s390x__) 478 /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ 479 # define QEMU_VMALLOC_ALIGN (256 * 4096) 480 #elif defined(__linux__) && defined(__sparc__) 481 # define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size, SHMLBA) 482 #else 483 # define QEMU_VMALLOC_ALIGN qemu_real_host_page_size 484 #endif 485 486 #ifdef CONFIG_POSIX 487 struct qemu_signalfd_siginfo { 488 uint32_t ssi_signo; /* Signal number */ 489 int32_t ssi_errno; /* Error number (unused) */ 490 int32_t ssi_code; /* Signal code */ 491 uint32_t ssi_pid; /* PID of sender */ 492 uint32_t ssi_uid; /* Real UID of sender */ 493 int32_t ssi_fd; /* File descriptor (SIGIO) */ 494 uint32_t ssi_tid; /* Kernel timer ID (POSIX timers) */ 495 uint32_t ssi_band; /* Band event (SIGIO) */ 496 uint32_t ssi_overrun; /* POSIX timer overrun count */ 497 uint32_t ssi_trapno; /* Trap number that caused signal */ 498 int32_t ssi_status; /* Exit status or signal (SIGCHLD) */ 499 int32_t ssi_int; /* Integer sent by sigqueue(2) */ 500 uint64_t ssi_ptr; /* Pointer sent by sigqueue(2) */ 501 uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */ 502 uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */ 503 uint64_t ssi_addr; /* Address that generated signal 504 (for hardware-generated signals) */ 505 uint8_t pad[48]; /* Pad size to 128 bytes (allow for 506 additional fields in the future) */ 507 }; 508 509 int qemu_signalfd(const sigset_t *mask); 510 void sigaction_invoke(struct sigaction *action, 511 struct qemu_signalfd_siginfo *info); 512 #endif 513 514 int qemu_madvise(void *addr, size_t len, int advice); 515 int qemu_mprotect_rwx(void *addr, size_t size); 516 int qemu_mprotect_none(void *addr, size_t size); 517 518 /* 519 * Don't introduce new usage of this function, prefer the following 520 * qemu_open/qemu_create that take an "Error **errp" 521 */ 522 int qemu_open_old(const char *name, int flags, ...); 523 int qemu_open(const char *name, int flags, Error **errp); 524 int qemu_create(const char *name, int flags, mode_t mode, Error **errp); 525 int qemu_close(int fd); 526 int qemu_unlink(const char *name); 527 #ifndef _WIN32 528 int qemu_dup_flags(int fd, int flags); 529 int qemu_dup(int fd); 530 int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive); 531 int qemu_unlock_fd(int fd, int64_t start, int64_t len); 532 int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive); 533 bool qemu_has_ofd_lock(void); 534 #endif 535 536 #if defined(__HAIKU__) && defined(__i386__) 537 #define FMT_pid "%ld" 538 #elif defined(WIN64) 539 #define FMT_pid "%" PRId64 540 #else 541 #define FMT_pid "%d" 542 #endif 543 544 bool qemu_write_pidfile(const char *pidfile, Error **errp); 545 546 int qemu_get_thread_id(void); 547 548 #ifndef CONFIG_IOVEC 549 struct iovec { 550 void *iov_base; 551 size_t iov_len; 552 }; 553 /* 554 * Use the same value as Linux for now. 555 */ 556 #define IOV_MAX 1024 557 558 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt); 559 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt); 560 #endif 561 562 #ifdef _WIN32 563 static inline void qemu_timersub(const struct timeval *val1, 564 const struct timeval *val2, 565 struct timeval *res) 566 { 567 res->tv_sec = val1->tv_sec - val2->tv_sec; 568 if (val1->tv_usec < val2->tv_usec) { 569 res->tv_sec--; 570 res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000; 571 } else { 572 res->tv_usec = val1->tv_usec - val2->tv_usec; 573 } 574 } 575 #else 576 #define qemu_timersub timersub 577 #endif 578 579 void qemu_set_cloexec(int fd); 580 581 /* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default 582 * instead of QEMU_VERSION, so setting hw_version on MachineClass 583 * is no longer mandatory. 584 * 585 * Do NOT change this string, or it will break compatibility on all 586 * machine classes that don't set hw_version. 587 */ 588 #define QEMU_HW_VERSION "2.5+" 589 590 /* QEMU "hardware version" setting. Used to replace code that exposed 591 * QEMU_VERSION to guests in the past and need to keep compatibility. 592 * Do not use qemu_hw_version() in new code. 593 */ 594 void qemu_set_hw_version(const char *); 595 const char *qemu_hw_version(void); 596 597 void fips_set_state(bool requested); 598 bool fips_get_state(void); 599 600 /* Return a dynamically allocated pathname denoting a file or directory that is 601 * appropriate for storing local state. 602 * 603 * @relative_pathname need not start with a directory separator; one will be 604 * added automatically. 605 * 606 * The caller is responsible for releasing the value returned with g_free() 607 * after use. 608 */ 609 char *qemu_get_local_state_pathname(const char *relative_pathname); 610 611 /* Find program directory, and save it for later usage with 612 * qemu_get_exec_dir(). 613 * Try OS specific API first, if not working, parse from argv0. */ 614 void qemu_init_exec_dir(const char *argv0); 615 616 /* Get the saved exec dir. */ 617 const char *qemu_get_exec_dir(void); 618 619 /** 620 * qemu_getauxval: 621 * @type: the auxiliary vector key to lookup 622 * 623 * Search the auxiliary vector for @type, returning the value 624 * or 0 if @type is not present. 625 */ 626 unsigned long qemu_getauxval(unsigned long type); 627 628 void qemu_set_tty_echo(int fd, bool echo); 629 630 void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus, 631 Error **errp); 632 633 /** 634 * qemu_get_pid_name: 635 * @pid: pid of a process 636 * 637 * For given @pid fetch its name. Caller is responsible for 638 * freeing the string when no longer needed. 639 * Returns allocated string on success, NULL on failure. 640 */ 641 char *qemu_get_pid_name(pid_t pid); 642 643 /** 644 * qemu_fork: 645 * 646 * A version of fork that avoids signal handler race 647 * conditions that can lead to child process getting 648 * signals that are otherwise only expected by the 649 * parent. It also resets all signal handlers to the 650 * default settings. 651 * 652 * Returns 0 to child process, pid number to parent 653 * or -1 on failure. 654 */ 655 pid_t qemu_fork(Error **errp); 656 657 /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even 658 * when intptr_t is 32-bit and we are aligning a long long. 659 */ 660 extern uintptr_t qemu_real_host_page_size; 661 extern intptr_t qemu_real_host_page_mask; 662 663 extern int qemu_icache_linesize; 664 extern int qemu_icache_linesize_log; 665 extern int qemu_dcache_linesize; 666 extern int qemu_dcache_linesize_log; 667 668 /* 669 * After using getopt or getopt_long, if you need to parse another set 670 * of options, then you must reset optind. Unfortunately the way to 671 * do this varies between implementations of getopt. 672 */ 673 static inline void qemu_reset_optind(void) 674 { 675 #ifdef HAVE_OPTRESET 676 optind = 1; 677 optreset = 1; 678 #else 679 optind = 0; 680 #endif 681 } 682 683 /** 684 * qemu_get_host_name: 685 * @errp: Error object 686 * 687 * Operating system agnostic way of querying host name. 688 * 689 * Returns allocated hostname (caller should free), NULL on failure. 690 */ 691 char *qemu_get_host_name(Error **errp); 692 693 /** 694 * qemu_get_host_physmem: 695 * 696 * Operating system agnostic way of querying host memory. 697 * 698 * Returns amount of physical memory on the system. This is purely 699 * advisery and may return 0 if we can't work it out. At the other 700 * end we saturate to SIZE_MAX if you are lucky enough to have that 701 * much memory. 702 */ 703 size_t qemu_get_host_physmem(void); 704 705 /* 706 * Toggle write/execute on the pages marked MAP_JIT 707 * for the current thread. 708 */ 709 #if defined(MAC_OS_VERSION_11_0) && \ 710 MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0 711 static inline void qemu_thread_jit_execute(void) 712 { 713 if (__builtin_available(macOS 11.0, *)) { 714 pthread_jit_write_protect_np(true); 715 } 716 } 717 718 static inline void qemu_thread_jit_write(void) 719 { 720 if (__builtin_available(macOS 11.0, *)) { 721 pthread_jit_write_protect_np(false); 722 } 723 } 724 #else 725 static inline void qemu_thread_jit_write(void) {} 726 static inline void qemu_thread_jit_execute(void) {} 727 #endif 728 729 /** 730 * Platforms which do not support system() return ENOSYS 731 */ 732 #ifndef HAVE_SYSTEM_FUNCTION 733 #define system platform_does_not_support_system 734 static inline int platform_does_not_support_system(const char *command) 735 { 736 errno = ENOSYS; 737 return -1; 738 } 739 #endif /* !HAVE_SYSTEM_FUNCTION */ 740 741 #ifdef __cplusplus 742 } 743 #endif 744 745 #endif 746