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