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 /* 38 * HOST_WORDS_BIGENDIAN was replaced with HOST_BIG_ENDIAN. Prevent it from 39 * creeping back in. 40 */ 41 #pragma GCC poison HOST_WORDS_BIGENDIAN 42 43 /* 44 * TARGET_WORDS_BIGENDIAN was replaced with TARGET_BIG_ENDIAN. Prevent it from 45 * creeping back in. 46 */ 47 #pragma GCC poison TARGET_WORDS_BIGENDIAN 48 49 #include "qemu/compiler.h" 50 51 /* Older versions of C++ don't get definitions of various macros from 52 * stdlib.h unless we define these macros before first inclusion of 53 * that system header. 54 */ 55 #ifndef __STDC_CONSTANT_MACROS 56 #define __STDC_CONSTANT_MACROS 57 #endif 58 #ifndef __STDC_LIMIT_MACROS 59 #define __STDC_LIMIT_MACROS 60 #endif 61 #ifndef __STDC_FORMAT_MACROS 62 #define __STDC_FORMAT_MACROS 63 #endif 64 65 /* The following block of code temporarily renames the daemon() function so the 66 * compiler does not see the warning associated with it in stdlib.h on OSX 67 */ 68 #ifdef __APPLE__ 69 #define daemon qemu_fake_daemon_function 70 #include <stdlib.h> 71 #undef daemon 72 QEMU_EXTERN_C int daemon(int, int); 73 #endif 74 75 #ifdef _WIN32 76 /* as defined in sdkddkver.h */ 77 #ifndef _WIN32_WINNT 78 #define _WIN32_WINNT 0x0600 /* Vista */ 79 #endif 80 /* reduces the number of implicitly included headers */ 81 #ifndef WIN32_LEAN_AND_MEAN 82 #define WIN32_LEAN_AND_MEAN 83 #endif 84 #endif 85 86 /* enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later) */ 87 #ifdef __MINGW32__ 88 #define __USE_MINGW_ANSI_STDIO 1 89 #endif 90 91 #include <stdarg.h> 92 #include <stddef.h> 93 #include <stdbool.h> 94 #include <stdint.h> 95 #include <sys/types.h> 96 #include <stdlib.h> 97 #include <stdio.h> 98 99 #include <string.h> 100 #include <strings.h> 101 #include <inttypes.h> 102 #include <limits.h> 103 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r 104 * function availability on recentish Mingw-w64 platforms. */ 105 #include <unistd.h> 106 #include <time.h> 107 #include <ctype.h> 108 #include <errno.h> 109 #include <fcntl.h> 110 #include <getopt.h> 111 #include <sys/stat.h> 112 #include <sys/time.h> 113 #include <assert.h> 114 /* setjmp must be declared before sysemu/os-win32.h 115 * because it is redefined there. */ 116 #include <setjmp.h> 117 #include <signal.h> 118 119 #ifdef CONFIG_IOVEC 120 #include <sys/uio.h> 121 #endif 122 123 #if defined(__linux__) && defined(__sparc__) 124 /* The SPARC definition of QEMU_VMALLOC_ALIGN needs SHMLBA */ 125 #include <sys/shm.h> 126 #endif 127 128 #ifndef _WIN32 129 #include <sys/wait.h> 130 #else 131 #define WIFEXITED(x) 1 132 #define WEXITSTATUS(x) (x) 133 #endif 134 135 #ifdef __APPLE__ 136 #include <AvailabilityMacros.h> 137 #endif 138 139 /* 140 * This is somewhat like a system header; it must be outside any extern "C" 141 * block because it includes system headers itself, including glib.h, 142 * which will not compile if inside an extern "C" block. 143 */ 144 #include "glib-compat.h" 145 146 #ifdef _WIN32 147 #include "sysemu/os-win32.h" 148 #endif 149 150 #ifdef CONFIG_POSIX 151 #include "sysemu/os-posix.h" 152 #endif 153 154 #ifdef __cplusplus 155 extern "C" { 156 #endif 157 158 #include "qemu/typedefs.h" 159 160 /* 161 * For mingw, as of v6.0.0, the function implementing the assert macro is 162 * not marked as noreturn, so the compiler cannot delete code following an 163 * assert(false) as unused. We rely on this within the code base to delete 164 * code that is unreachable when features are disabled. 165 * All supported versions of Glib's g_assert() satisfy this requirement. 166 */ 167 #ifdef __MINGW32__ 168 #undef assert 169 #define assert(x) g_assert(x) 170 #endif 171 172 /* 173 * According to waitpid man page: 174 * WCOREDUMP 175 * This macro is not specified in POSIX.1-2001 and is not 176 * available on some UNIX implementations (e.g., AIX, SunOS). 177 * Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif. 178 */ 179 #ifndef WCOREDUMP 180 #define WCOREDUMP(status) 0 181 #endif 182 /* 183 * We have a lot of unaudited code that may fail in strange ways, or 184 * even be a security risk during migration, if you disable assertions 185 * at compile-time. You may comment out these safety checks if you 186 * absolutely want to disable assertion overhead, but it is not 187 * supported upstream so the risk is all yours. Meanwhile, please 188 * submit patches to remove any side-effects inside an assertion, or 189 * fixing error handling that should use Error instead of assert. 190 */ 191 #ifdef NDEBUG 192 #error building with NDEBUG is not supported 193 #endif 194 #ifdef G_DISABLE_ASSERT 195 #error building with G_DISABLE_ASSERT is not supported 196 #endif 197 198 #ifndef O_LARGEFILE 199 #define O_LARGEFILE 0 200 #endif 201 #ifndef O_BINARY 202 #define O_BINARY 0 203 #endif 204 #ifndef MAP_ANONYMOUS 205 #define MAP_ANONYMOUS MAP_ANON 206 #endif 207 #ifndef MAP_FIXED_NOREPLACE 208 #define MAP_FIXED_NOREPLACE 0 209 #endif 210 #ifndef MAP_NORESERVE 211 #define MAP_NORESERVE 0 212 #endif 213 #ifndef ENOMEDIUM 214 #define ENOMEDIUM ENODEV 215 #endif 216 #if !defined(ENOTSUP) 217 #define ENOTSUP 4096 218 #endif 219 #if !defined(ECANCELED) 220 #define ECANCELED 4097 221 #endif 222 #if !defined(EMEDIUMTYPE) 223 #define EMEDIUMTYPE 4098 224 #endif 225 #if !defined(ESHUTDOWN) 226 #define ESHUTDOWN 4099 227 #endif 228 229 #define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR) 230 231 /* time_t may be either 32 or 64 bits depending on the host OS, and 232 * can be either signed or unsigned, so we can't just hardcode a 233 * specific maximum value. This is not a C preprocessor constant, 234 * so you can't use TIME_MAX in an #ifdef, but for our purposes 235 * this isn't a problem. 236 */ 237 238 /* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from 239 * Gnulib, and are under the LGPL v2.1 or (at your option) any 240 * later version. 241 */ 242 243 /* True if the real type T is signed. */ 244 #define TYPE_SIGNED(t) (!((t)0 < (t)-1)) 245 246 /* The width in bits of the integer type or expression T. 247 * Padding bits are not supported. 248 */ 249 #define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT) 250 251 /* The maximum and minimum values for the integer type T. */ 252 #define TYPE_MAXIMUM(t) \ 253 ((t) (!TYPE_SIGNED(t) \ 254 ? (t)-1 \ 255 : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1))) 256 257 #ifndef TIME_MAX 258 #define TIME_MAX TYPE_MAXIMUM(time_t) 259 #endif 260 261 /* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with 262 * the wrong type. Our replacement isn't usable in preprocessor 263 * expressions, but it is sufficient for our needs. */ 264 #ifdef HAVE_BROKEN_SIZE_MAX 265 #undef SIZE_MAX 266 #define SIZE_MAX ((size_t)-1) 267 #endif 268 269 /* 270 * Two variations of MIN/MAX macros. The first is for runtime use, and 271 * evaluates arguments only once (so it is safe even with side 272 * effects), but will not work in constant contexts (such as array 273 * size declarations) because of the '{}'. The second is for constant 274 * expression use, where evaluating arguments twice is safe because 275 * the result is going to be constant anyway, but will not work in a 276 * runtime context because of a void expression where a value is 277 * expected. Thus, both gcc and clang will fail to compile if you use 278 * the wrong macro (even if the error may seem a bit cryptic). 279 * 280 * Note that neither form is usable as an #if condition; if you truly 281 * need to write conditional code that depends on a minimum or maximum 282 * determined by the pre-processor instead of the compiler, you'll 283 * have to open-code it. Sadly, Coverity is severely confused by the 284 * constant variants, so we have to dumb things down there. 285 */ 286 #undef MIN 287 #define MIN(a, b) \ 288 ({ \ 289 typeof(1 ? (a) : (b)) _a = (a), _b = (b); \ 290 _a < _b ? _a : _b; \ 291 }) 292 #undef MAX 293 #define MAX(a, b) \ 294 ({ \ 295 typeof(1 ? (a) : (b)) _a = (a), _b = (b); \ 296 _a > _b ? _a : _b; \ 297 }) 298 299 #ifdef __COVERITY__ 300 # define MIN_CONST(a, b) ((a) < (b) ? (a) : (b)) 301 # define MAX_CONST(a, b) ((a) > (b) ? (a) : (b)) 302 #else 303 # define MIN_CONST(a, b) \ 304 __builtin_choose_expr( \ 305 __builtin_constant_p(a) && __builtin_constant_p(b), \ 306 (a) < (b) ? (a) : (b), \ 307 ((void)0)) 308 # define MAX_CONST(a, b) \ 309 __builtin_choose_expr( \ 310 __builtin_constant_p(a) && __builtin_constant_p(b), \ 311 (a) > (b) ? (a) : (b), \ 312 ((void)0)) 313 #endif 314 315 /* 316 * Minimum function that returns zero only if both values are zero. 317 * Intended for use with unsigned values only. 318 */ 319 #ifndef MIN_NON_ZERO 320 #define MIN_NON_ZERO(a, b) \ 321 ({ \ 322 typeof(1 ? (a) : (b)) _a = (a), _b = (b); \ 323 _a == 0 ? _b : (_b == 0 || _b > _a) ? _a : _b; \ 324 }) 325 #endif 326 327 /* 328 * Round number down to multiple. Safe when m is not a power of 2 (see 329 * ROUND_DOWN for a faster version when a power of 2 is guaranteed). 330 */ 331 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m)) 332 333 /* 334 * Round number up to multiple. Safe when m is not a power of 2 (see 335 * ROUND_UP for a faster version when a power of 2 is guaranteed). 336 */ 337 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m)) 338 339 /* Check if n is a multiple of m */ 340 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0) 341 342 /* n-byte align pointer down */ 343 #define QEMU_ALIGN_PTR_DOWN(p, n) \ 344 ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n))) 345 346 /* n-byte align pointer up */ 347 #define QEMU_ALIGN_PTR_UP(p, n) \ 348 ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n))) 349 350 /* Check if pointer p is n-bytes aligned */ 351 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n)) 352 353 /* 354 * Round number down to multiple. Requires that d be a power of 2 (see 355 * QEMU_ALIGN_UP for a safer but slower version on arbitrary 356 * numbers); works even if d is a smaller type than n. 357 */ 358 #ifndef ROUND_DOWN 359 #define ROUND_DOWN(n, d) ((n) & -(0 ? (n) : (d))) 360 #endif 361 362 /* 363 * Round number up to multiple. Requires that d be a power of 2 (see 364 * QEMU_ALIGN_UP for a safer but slower version on arbitrary 365 * numbers); works even if d is a smaller type than n. 366 */ 367 #ifndef ROUND_UP 368 #define ROUND_UP(n, d) ROUND_DOWN((n) + (d) - 1, (d)) 369 #endif 370 371 #ifndef DIV_ROUND_UP 372 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 373 #endif 374 375 /* 376 * &(x)[0] is always a pointer - if it's same type as x then the argument is a 377 * pointer, not an array. 378 */ 379 #define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \ 380 typeof(&(x)[0]))) 381 #ifndef ARRAY_SIZE 382 #define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \ 383 QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x))) 384 #endif 385 386 int qemu_daemon(int nochdir, int noclose); 387 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared, 388 bool noreserve); 389 void qemu_anon_ram_free(void *ptr, size_t size); 390 391 #ifdef _WIN32 392 #define HAVE_CHARDEV_SERIAL 1 393 #elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \ 394 || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \ 395 || defined(__GLIBC__) || defined(__APPLE__) 396 #define HAVE_CHARDEV_SERIAL 1 397 #endif 398 399 #if defined(__linux__) || defined(__FreeBSD__) || \ 400 defined(__FreeBSD_kernel__) || defined(__DragonFly__) 401 #define HAVE_CHARDEV_PARPORT 1 402 #endif 403 404 #if defined(__HAIKU__) 405 #define SIGIO SIGPOLL 406 #endif 407 408 #ifdef HAVE_MADVISE_WITHOUT_PROTOTYPE 409 /* 410 * See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for discussion 411 * about Solaris missing the madvise() prototype. 412 */ 413 extern int madvise(char *, size_t, int); 414 #endif 415 416 #if defined(CONFIG_LINUX) 417 #ifndef BUS_MCEERR_AR 418 #define BUS_MCEERR_AR 4 419 #endif 420 #ifndef BUS_MCEERR_AO 421 #define BUS_MCEERR_AO 5 422 #endif 423 #endif 424 425 #if defined(__linux__) && \ 426 (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \ 427 || defined(__powerpc64__)) 428 /* Use 2 MiB alignment so transparent hugepages can be used by KVM. 429 Valgrind does not support alignments larger than 1 MiB, 430 therefore we need special code which handles running on Valgrind. */ 431 # define QEMU_VMALLOC_ALIGN (512 * 4096) 432 #elif defined(__linux__) && defined(__s390x__) 433 /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ 434 # define QEMU_VMALLOC_ALIGN (256 * 4096) 435 #elif defined(__linux__) && defined(__sparc__) 436 # define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size(), SHMLBA) 437 #else 438 # define QEMU_VMALLOC_ALIGN qemu_real_host_page_size() 439 #endif 440 441 #ifdef CONFIG_POSIX 442 struct qemu_signalfd_siginfo { 443 uint32_t ssi_signo; /* Signal number */ 444 int32_t ssi_errno; /* Error number (unused) */ 445 int32_t ssi_code; /* Signal code */ 446 uint32_t ssi_pid; /* PID of sender */ 447 uint32_t ssi_uid; /* Real UID of sender */ 448 int32_t ssi_fd; /* File descriptor (SIGIO) */ 449 uint32_t ssi_tid; /* Kernel timer ID (POSIX timers) */ 450 uint32_t ssi_band; /* Band event (SIGIO) */ 451 uint32_t ssi_overrun; /* POSIX timer overrun count */ 452 uint32_t ssi_trapno; /* Trap number that caused signal */ 453 int32_t ssi_status; /* Exit status or signal (SIGCHLD) */ 454 int32_t ssi_int; /* Integer sent by sigqueue(2) */ 455 uint64_t ssi_ptr; /* Pointer sent by sigqueue(2) */ 456 uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */ 457 uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */ 458 uint64_t ssi_addr; /* Address that generated signal 459 (for hardware-generated signals) */ 460 uint8_t pad[48]; /* Pad size to 128 bytes (allow for 461 additional fields in the future) */ 462 }; 463 464 int qemu_signalfd(const sigset_t *mask); 465 void sigaction_invoke(struct sigaction *action, 466 struct qemu_signalfd_siginfo *info); 467 #endif 468 469 /* 470 * Don't introduce new usage of this function, prefer the following 471 * qemu_open/qemu_create that take an "Error **errp" 472 */ 473 int qemu_open_old(const char *name, int flags, ...); 474 int qemu_open(const char *name, int flags, Error **errp); 475 int qemu_create(const char *name, int flags, mode_t mode, Error **errp); 476 int qemu_close(int fd); 477 int qemu_unlink(const char *name); 478 #ifndef _WIN32 479 int qemu_dup_flags(int fd, int flags); 480 int qemu_dup(int fd); 481 int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive); 482 int qemu_unlock_fd(int fd, int64_t start, int64_t len); 483 int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive); 484 bool qemu_has_ofd_lock(void); 485 #endif 486 487 #if defined(__HAIKU__) && defined(__i386__) 488 #define FMT_pid "%ld" 489 #elif defined(WIN64) 490 #define FMT_pid "%" PRId64 491 #else 492 #define FMT_pid "%d" 493 #endif 494 495 bool qemu_write_pidfile(const char *pidfile, Error **errp); 496 497 int qemu_get_thread_id(void); 498 499 #ifndef CONFIG_IOVEC 500 struct iovec { 501 void *iov_base; 502 size_t iov_len; 503 }; 504 /* 505 * Use the same value as Linux for now. 506 */ 507 #define IOV_MAX 1024 508 509 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt); 510 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt); 511 #endif 512 513 #ifdef _WIN32 514 static inline void qemu_timersub(const struct timeval *val1, 515 const struct timeval *val2, 516 struct timeval *res) 517 { 518 res->tv_sec = val1->tv_sec - val2->tv_sec; 519 if (val1->tv_usec < val2->tv_usec) { 520 res->tv_sec--; 521 res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000; 522 } else { 523 res->tv_usec = val1->tv_usec - val2->tv_usec; 524 } 525 } 526 #else 527 #define qemu_timersub timersub 528 #endif 529 530 ssize_t qemu_write_full(int fd, const void *buf, size_t count) 531 G_GNUC_WARN_UNUSED_RESULT; 532 533 #ifndef _WIN32 534 int qemu_pipe(int pipefd[2]); 535 #endif 536 537 void qemu_set_cloexec(int fd); 538 539 void fips_set_state(bool requested); 540 bool fips_get_state(void); 541 542 /* Return a dynamically allocated pathname denoting a file or directory that is 543 * appropriate for storing local state. 544 * 545 * @relative_pathname need not start with a directory separator; one will be 546 * added automatically. 547 * 548 * The caller is responsible for releasing the value returned with g_free() 549 * after use. 550 */ 551 char *qemu_get_local_state_pathname(const char *relative_pathname); 552 553 /* Find program directory, and save it for later usage with 554 * qemu_get_exec_dir(). 555 * Try OS specific API first, if not working, parse from argv0. */ 556 void qemu_init_exec_dir(const char *argv0); 557 558 /* Get the saved exec dir. */ 559 const char *qemu_get_exec_dir(void); 560 561 /** 562 * qemu_getauxval: 563 * @type: the auxiliary vector key to lookup 564 * 565 * Search the auxiliary vector for @type, returning the value 566 * or 0 if @type is not present. 567 */ 568 unsigned long qemu_getauxval(unsigned long type); 569 570 void qemu_set_tty_echo(int fd, bool echo); 571 572 void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus, 573 Error **errp); 574 575 /** 576 * qemu_get_pid_name: 577 * @pid: pid of a process 578 * 579 * For given @pid fetch its name. Caller is responsible for 580 * freeing the string when no longer needed. 581 * Returns allocated string on success, NULL on failure. 582 */ 583 char *qemu_get_pid_name(pid_t pid); 584 585 /** 586 * qemu_fork: 587 * 588 * A version of fork that avoids signal handler race 589 * conditions that can lead to child process getting 590 * signals that are otherwise only expected by the 591 * parent. It also resets all signal handlers to the 592 * default settings. 593 * 594 * Returns 0 to child process, pid number to parent 595 * or -1 on failure. 596 */ 597 pid_t qemu_fork(Error **errp); 598 599 /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even 600 * when intptr_t is 32-bit and we are aligning a long long. 601 */ 602 static inline uintptr_t qemu_real_host_page_size(void) 603 { 604 return getpagesize(); 605 } 606 607 static inline intptr_t qemu_real_host_page_mask(void) 608 { 609 return -(intptr_t)qemu_real_host_page_size(); 610 } 611 612 /* 613 * After using getopt or getopt_long, if you need to parse another set 614 * of options, then you must reset optind. Unfortunately the way to 615 * do this varies between implementations of getopt. 616 */ 617 static inline void qemu_reset_optind(void) 618 { 619 #ifdef HAVE_OPTRESET 620 optind = 1; 621 optreset = 1; 622 #else 623 optind = 0; 624 #endif 625 } 626 627 /** 628 * qemu_get_host_name: 629 * @errp: Error object 630 * 631 * Operating system agnostic way of querying host name. 632 * 633 * Returns allocated hostname (caller should free), NULL on failure. 634 */ 635 char *qemu_get_host_name(Error **errp); 636 637 /** 638 * qemu_get_host_physmem: 639 * 640 * Operating system agnostic way of querying host memory. 641 * 642 * Returns amount of physical memory on the system. This is purely 643 * advisery and may return 0 if we can't work it out. At the other 644 * end we saturate to SIZE_MAX if you are lucky enough to have that 645 * much memory. 646 */ 647 size_t qemu_get_host_physmem(void); 648 649 /* 650 * Toggle write/execute on the pages marked MAP_JIT 651 * for the current thread. 652 */ 653 #if defined(MAC_OS_VERSION_11_0) && \ 654 MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_VERSION_11_0 655 static inline void qemu_thread_jit_execute(void) 656 { 657 pthread_jit_write_protect_np(true); 658 } 659 660 static inline void qemu_thread_jit_write(void) 661 { 662 pthread_jit_write_protect_np(false); 663 } 664 #else 665 static inline void qemu_thread_jit_write(void) {} 666 static inline void qemu_thread_jit_execute(void) {} 667 #endif 668 669 /** 670 * Platforms which do not support system() return ENOSYS 671 */ 672 #ifndef HAVE_SYSTEM_FUNCTION 673 #define system platform_does_not_support_system 674 static inline int platform_does_not_support_system(const char *command) 675 { 676 errno = ENOSYS; 677 return -1; 678 } 679 #endif /* !HAVE_SYSTEM_FUNCTION */ 680 681 #ifdef __cplusplus 682 } 683 #endif 684 685 #endif 686