include/qemu/osdep.h - qemu-android - Git at Google

 /*
  * OS includes and handling of OS dependencies
  *
  * This header exists to pull in some common system headers that
  * most code in QEMU will want, and to fix up some possible issues with
  * it (missing defines, Windows weirdness, and so on).
  *
  * To avoid getting into possible circular include dependencies, this
  * file should not include any other QEMU headers, with the exceptions
  * of config-host.h, config-target.h, qemu/compiler.h,
  * sysemu/os-posix.h, sysemu/os-win32.h, glib-compat.h and
  * qemu/typedefs.h, all of which are doing a similar job to this file
  * and are under similar constraints.
  *
  * This header also contains prototypes for functions defined in
  * os-*.c and util/oslib-*.c; those would probably be better split
  * out into separate header files.
  *
  * In an ideal world this header would contain only:
  *  (1) things which everybody needs
  *  (2) things without which code would work on most platforms but
  *      fail to compile or misbehave on a minority of host OSes
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 #ifndef QEMU_OSDEP_H
 #define QEMU_OSDEP_H

 #include "config-host.h"
 #ifdef NEED_CPU_H
 #include "config-target.h"
 #else
 #include "exec/poison.h"
 #endif
 #include "qemu/compiler.h"

 /* Older versions of C++ don't get definitions of various macros from
  * stdlib.h unless we define these macros before first inclusion of
  * that system header.
  */
 #ifndef __STDC_CONSTANT_MACROS
 #define __STDC_CONSTANT_MACROS
 #endif
 #ifndef __STDC_LIMIT_MACROS
 #define __STDC_LIMIT_MACROS
 #endif
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
 #endif

 /* The following block of code temporarily renames the daemon() function so the
  * compiler does not see the warning associated with it in stdlib.h on OSX
  */
 #ifdef __APPLE__
 #define daemon qemu_fake_daemon_function
 #include <stdlib.h>
 #undef daemon
 extern int daemon(int, int);
 #endif

 #include <stdarg.h>
 #include <stddef.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <sys/types.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <strings.h>
 #include <inttypes.h>
 #include <limits.h>
 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
  * function availability on recentish Mingw-w64 platforms. */
 #include <unistd.h>
 #include <time.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <assert.h>
 /* setjmp must be declared before sysemu/os-win32.h
  * because it is redefined there. */
 #include <setjmp.h>
 #include <signal.h>

 #ifdef __OpenBSD__
 #include <sys/signal.h>
 #endif

 #ifndef _WIN32
 #include <sys/wait.h>
 #else
 #define WIFEXITED(x)   1
 #define WEXITSTATUS(x) (x)
 #endif

 #ifdef _WIN32
 #include "sysemu/os-win32.h"
 #endif

 #ifdef CONFIG_POSIX
 #include "sysemu/os-posix.h"
 #endif

 #include "glib-compat.h"
 #include "qemu/typedefs.h"

 #ifndef O_LARGEFILE
 #define O_LARGEFILE 0
 #endif
 #ifndef O_BINARY
 #define O_BINARY 0
 #endif
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 #ifndef ENOMEDIUM
 #define ENOMEDIUM ENODEV
 #endif
 #if !defined(ENOTSUP)
 #define ENOTSUP 4096
 #endif
 #if !defined(ECANCELED)
 #define ECANCELED 4097
 #endif
 #if !defined(EMEDIUMTYPE)
 #define EMEDIUMTYPE 4098
 #endif
 #ifndef TIME_MAX
 #define TIME_MAX LONG_MAX
 #endif

 /* HOST_LONG_BITS is the size of a native pointer in bits. */
 #if UINTPTR_MAX == UINT32_MAX
 # define HOST_LONG_BITS 32
 #elif UINTPTR_MAX == UINT64_MAX
 # define HOST_LONG_BITS 64
 #else
 # error Unknown pointer size
 #endif

 #ifndef MIN
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 #endif
 #ifndef MAX
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 #endif

 /* Minimum function that returns zero only iff both values are zero.
  * Intended for use with unsigned values only. */
 #ifndef MIN_NON_ZERO
 #define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
                                 ((b) == 0 ? (a) : (MIN(a, b))))
 #endif

 /* Round number down to multiple */
 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))

 /* Round number up to multiple. Safe when m is not a power of 2 (see
  * ROUND_UP for a faster version when a power of 2 is guaranteed) */
 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))

 /* Check if n is a multiple of m */
 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)

 /* n-byte align pointer down */
 #define QEMU_ALIGN_PTR_DOWN(p, n) \
     ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))

 /* n-byte align pointer up */
 #define QEMU_ALIGN_PTR_UP(p, n) \
     ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))

 /* Check if pointer p is n-bytes aligned */
 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))

 /* Round number up to multiple. Requires that d be a power of 2 (see
  * QEMU_ALIGN_UP for a safer but slower version on arbitrary
  * numbers) */
 #ifndef ROUND_UP
 #define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
 #endif

 #ifndef DIV_ROUND_UP
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #endif

 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 #endif

 int qemu_daemon(int nochdir, int noclose);
 void *qemu_try_memalign(size_t alignment, size_t size);
 void *qemu_memalign(size_t alignment, size_t size);
 void *qemu_anon_ram_alloc(size_t size, uint64_t *align);
 void qemu_vfree(void *ptr);
 void qemu_anon_ram_free(void *ptr, size_t size);

 #define QEMU_MADV_INVALID -1

 #if defined(CONFIG_MADVISE)

 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
 #ifdef MADV_DONTFORK
 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
 #else
 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 #endif
 #ifdef MADV_MERGEABLE
 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 #else
 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 #endif
 #ifdef MADV_UNMERGEABLE
 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
 #else
 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 #endif
 #ifdef MADV_DODUMP
 #define QEMU_MADV_DODUMP MADV_DODUMP
 #else
 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 #endif
 #ifdef MADV_DONTDUMP
 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
 #else
 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 #endif
 #ifdef MADV_HUGEPAGE
 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
 #else
 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
 #endif
 #ifdef MADV_NOHUGEPAGE
 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
 #else
 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
 #endif

 #elif defined(CONFIG_POSIX_MADVISE)

 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID

 #else /* no-op */

 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID

 #endif

 #if defined(__linux__) && \
     (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__))
    /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
       Valgrind does not support alignments larger than 1 MiB,
       therefore we need special code which handles running on Valgrind. */
 #  define QEMU_VMALLOC_ALIGN (512 * 4096)
 #elif defined(__linux__) && defined(__s390x__)
    /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
 #  define QEMU_VMALLOC_ALIGN (256 * 4096)
 #else
 #  define QEMU_VMALLOC_ALIGN getpagesize()
 #endif

 int qemu_madvise(void *addr, size_t len, int advice);

 int qemu_open(const char *name, int flags, ...);
 int qemu_close(int fd);
 #ifndef _WIN32
 int qemu_dup(int fd);
 #endif

 #if defined(__HAIKU__) && defined(__i386__)
 #define FMT_pid "%ld"
 #elif defined(WIN64)
 #define FMT_pid "%" PRId64
 #else
 #define FMT_pid "%d"
 #endif

 int qemu_create_pidfile(const char *filename);
 int qemu_get_thread_id(void);

 #ifndef CONFIG_IOVEC
 struct iovec {
     void *iov_base;
     size_t iov_len;
 };
 /*
  * Use the same value as Linux for now.
  */
 #define IOV_MAX 1024

 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
 #else
 #include <sys/uio.h>
 #endif

 #ifdef _WIN32
 static inline void qemu_timersub(const struct timeval *val1,
                                  const struct timeval *val2,
                                  struct timeval *res)
 {
     res->tv_sec = val1->tv_sec - val2->tv_sec;
     if (val1->tv_usec < val2->tv_usec) {
         res->tv_sec--;
         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
     } else {
         res->tv_usec = val1->tv_usec - val2->tv_usec;
     }
 }
 #else
 #define qemu_timersub timersub
 #endif

 void qemu_set_cloexec(int fd);

 /* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
  * instead of QEMU_VERSION, so setting hw_version on MachineClass
  * is no longer mandatory.
  *
  * Do NOT change this string, or it will break compatibility on all
  * machine classes that don't set hw_version.
  */
 #define QEMU_HW_VERSION "2.5+"

 /* QEMU "hardware version" setting. Used to replace code that exposed
  * QEMU_VERSION to guests in the past and need to keep compatibility.
  * Do not use qemu_hw_version() in new code.
  */
 void qemu_set_hw_version(const char *);
 const char *qemu_hw_version(void);

 void fips_set_state(bool requested);
 bool fips_get_state(void);

 /* Return a dynamically allocated pathname denoting a file or directory that is
  * appropriate for storing local state.
  *
  * @relative_pathname need not start with a directory separator; one will be
  * added automatically.
  *
  * The caller is responsible for releasing the value returned with g_free()
  * after use.
  */
 char *qemu_get_local_state_pathname(const char *relative_pathname);

 /* Find program directory, and save it for later usage with
  * qemu_get_exec_dir().
  * Try OS specific API first, if not working, parse from argv0. */
 void qemu_init_exec_dir(const char *argv0);

 /* Get the saved exec dir.
  * Caller needs to release the returned string by g_free() */
 char *qemu_get_exec_dir(void);

 /**
  * qemu_getauxval:
  * @type: the auxiliary vector key to lookup
  *
  * Search the auxiliary vector for @type, returning the value
  * or 0 if @type is not present.
  */
 unsigned long qemu_getauxval(unsigned long type);

 void qemu_set_tty_echo(int fd, bool echo);

 void os_mem_prealloc(int fd, char *area, size_t sz, Error **errp);

 int qemu_read_password(char *buf, int buf_size);

 /**
  * qemu_fork:
  *
  * A version of fork that avoids signal handler race
  * conditions that can lead to child process getting
  * signals that are otherwise only expected by the
  * parent. It also resets all signal handlers to the
  * default settings.
  *
  * Returns 0 to child process, pid number to parent
  * or -1 on failure.
  */
 pid_t qemu_fork(Error **errp);

 #endif
	/*
	* OS includes and handling of OS dependencies
	*
	* This header exists to pull in some common system headers that
	* most code in QEMU will want, and to fix up some possible issues with
	* it (missing defines, Windows weirdness, and so on).
	*
	* To avoid getting into possible circular include dependencies, this
	* file should not include any other QEMU headers, with the exceptions
	* of config-host.h, config-target.h, qemu/compiler.h,
	* sysemu/os-posix.h, sysemu/os-win32.h, glib-compat.h and
	* qemu/typedefs.h, all of which are doing a similar job to this file
	* and are under similar constraints.
	*
	* This header also contains prototypes for functions defined in
	* os-.c and util/oslib-.c; those would probably be better split
	* out into separate header files.
	*
	* In an ideal world this header would contain only:
	* (1) things which everybody needs
	* (2) things without which code would work on most platforms but
	* fail to compile or misbehave on a minority of host OSes
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	* See the COPYING file in the top-level directory.
	*/
	#ifndef QEMU_OSDEP_H
	#define QEMU_OSDEP_H

	#include "config-host.h"
	#ifdef NEED_CPU_H
	#include "config-target.h"
	#else
	#include "exec/poison.h"
	#endif
	#include "qemu/compiler.h"

	/* Older versions of C++ don't get definitions of various macros from
	* stdlib.h unless we define these macros before first inclusion of
	* that system header.
	*/
	#ifndef __STDC_CONSTANT_MACROS
	#define __STDC_CONSTANT_MACROS
	#endif
	#ifndef __STDC_LIMIT_MACROS
	#define __STDC_LIMIT_MACROS
	#endif
	#ifndef __STDC_FORMAT_MACROS
	#define __STDC_FORMAT_MACROS
	#endif

	/* The following block of code temporarily renames the daemon() function so the
	* compiler does not see the warning associated with it in stdlib.h on OSX
	*/
	#ifdef __APPLE__
	#define daemon qemu_fake_daemon_function
	#include <stdlib.h>
	#undef daemon
	extern int daemon(int, int);
	#endif

	#include <stdarg.h>
	#include <stddef.h>
	#include <stdbool.h>
	#include <stdint.h>
	#include <sys/types.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <strings.h>
	#include <inttypes.h>
	#include <limits.h>
	/* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
	* function availability on recentish Mingw-w64 platforms. */
	#include <unistd.h>
	#include <time.h>
	#include <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <sys/stat.h>
	#include <sys/time.h>
	#include <assert.h>
	/* setjmp must be declared before sysemu/os-win32.h
	* because it is redefined there. */
	#include <setjmp.h>
	#include <signal.h>

	#ifdef __OpenBSD__
	#include <sys/signal.h>
	#endif

	#ifndef _WIN32
	#include <sys/wait.h>
	#else
	#define WIFEXITED(x) 1
	#define WEXITSTATUS(x) (x)
	#endif

	#ifdef _WIN32
	#include "sysemu/os-win32.h"
	#endif

	#ifdef CONFIG_POSIX
	#include "sysemu/os-posix.h"
	#endif

	#include "glib-compat.h"
	#include "qemu/typedefs.h"

	#ifndef O_LARGEFILE
	#define O_LARGEFILE 0
	#endif
	#ifndef O_BINARY
	#define O_BINARY 0
	#endif
	#ifndef MAP_ANONYMOUS
	#define MAP_ANONYMOUS MAP_ANON
	#endif
	#ifndef ENOMEDIUM
	#define ENOMEDIUM ENODEV
	#endif
	#if !defined(ENOTSUP)
	#define ENOTSUP 4096
	#endif
	#if !defined(ECANCELED)
	#define ECANCELED 4097
	#endif
	#if !defined(EMEDIUMTYPE)
	#define EMEDIUMTYPE 4098
	#endif
	#ifndef TIME_MAX
	#define TIME_MAX LONG_MAX
	#endif

	/* HOST_LONG_BITS is the size of a native pointer in bits. */
	#if UINTPTR_MAX == UINT32_MAX
	# define HOST_LONG_BITS 32
	#elif UINTPTR_MAX == UINT64_MAX
	# define HOST_LONG_BITS 64
	#else
	# error Unknown pointer size
	#endif

	#ifndef MIN
	#define MIN(a, b) (((a) < (b)) ? (a) : (b))
	#endif
	#ifndef MAX
	#define MAX(a, b) (((a) > (b)) ? (a) : (b))
	#endif

	/* Minimum function that returns zero only iff both values are zero.
	* Intended for use with unsigned values only. */
	#ifndef MIN_NON_ZERO
	#define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
	((b) == 0 ? (a) : (MIN(a, b))))
	#endif

	/* Round number down to multiple */
	#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))

	/* Round number up to multiple. Safe when m is not a power of 2 (see
	* ROUND_UP for a faster version when a power of 2 is guaranteed) */
	#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))

	/* Check if n is a multiple of m */
	#define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)

	/* n-byte align pointer down */
	#define QEMU_ALIGN_PTR_DOWN(p, n) \
	((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))

	/* n-byte align pointer up */
	#define QEMU_ALIGN_PTR_UP(p, n) \
	((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))

	/* Check if pointer p is n-bytes aligned */
	#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))

	/* Round number up to multiple. Requires that d be a power of 2 (see
	* QEMU_ALIGN_UP for a safer but slower version on arbitrary
	* numbers) */
	#ifndef ROUND_UP
	#define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
	#endif

	#ifndef DIV_ROUND_UP
	#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
	#endif

	#ifndef ARRAY_SIZE
	#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
	#endif

	int qemu_daemon(int nochdir, int noclose);
	void *qemu_try_memalign(size_t alignment, size_t size);
	void *qemu_memalign(size_t alignment, size_t size);
	void qemu_anon_ram_alloc(size_t size, uint64_t align);
	void qemu_vfree(void *ptr);
	void qemu_anon_ram_free(void *ptr, size_t size);

	#define QEMU_MADV_INVALID -1

	#if defined(CONFIG_MADVISE)

	#define QEMU_MADV_WILLNEED MADV_WILLNEED
	#define QEMU_MADV_DONTNEED MADV_DONTNEED
	#ifdef MADV_DONTFORK
	#define QEMU_MADV_DONTFORK MADV_DONTFORK
	#else
	#define QEMU_MADV_DONTFORK QEMU_MADV_INVALID
	#endif
	#ifdef MADV_MERGEABLE
	#define QEMU_MADV_MERGEABLE MADV_MERGEABLE
	#else
	#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
	#endif
	#ifdef MADV_UNMERGEABLE
	#define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
	#else
	#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
	#endif
	#ifdef MADV_DODUMP
	#define QEMU_MADV_DODUMP MADV_DODUMP
	#else
	#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
	#endif
	#ifdef MADV_DONTDUMP
	#define QEMU_MADV_DONTDUMP MADV_DONTDUMP
	#else
	#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
	#endif
	#ifdef MADV_HUGEPAGE
	#define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
	#else
	#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
	#endif
	#ifdef MADV_NOHUGEPAGE
	#define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
	#else
	#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
	#endif

	#elif defined(CONFIG_POSIX_MADVISE)

	#define QEMU_MADV_WILLNEED POSIX_MADV_WILLNEED
	#define QEMU_MADV_DONTNEED POSIX_MADV_DONTNEED
	#define QEMU_MADV_DONTFORK QEMU_MADV_INVALID
	#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
	#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
	#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
	#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
	#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
	#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID

	#else /* no-op */

	#define QEMU_MADV_WILLNEED QEMU_MADV_INVALID
	#define QEMU_MADV_DONTNEED QEMU_MADV_INVALID
	#define QEMU_MADV_DONTFORK QEMU_MADV_INVALID
	#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
	#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
	#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
	#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
	#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
	#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID

	#endif

	#if defined(__linux__) && \
	(defined(__x86_64__) \|\| defined(__arm__) \|\| defined(__aarch64__))
	/* Use 2 MiB alignment so transparent hugepages can be used by KVM.
	Valgrind does not support alignments larger than 1 MiB,
	therefore we need special code which handles running on Valgrind. */
	# define QEMU_VMALLOC_ALIGN (512 * 4096)
	#elif defined(__linux__) && defined(__s390x__)
	/* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
	# define QEMU_VMALLOC_ALIGN (256 * 4096)
	#else
	# define QEMU_VMALLOC_ALIGN getpagesize()
	#endif

	int qemu_madvise(void *addr, size_t len, int advice);

	int qemu_open(const char *name, int flags, ...);
	int qemu_close(int fd);
	#ifndef _WIN32
	int qemu_dup(int fd);
	#endif

	#if defined(__HAIKU__) && defined(__i386__)
	#define FMT_pid "%ld"
	#elif defined(WIN64)
	#define FMT_pid "%" PRId64
	#else
	#define FMT_pid "%d"
	#endif

	int qemu_create_pidfile(const char *filename);
	int qemu_get_thread_id(void);

	#ifndef CONFIG_IOVEC
	struct iovec {
	void *iov_base;
	size_t iov_len;
	};
	/*
	* Use the same value as Linux for now.
	*/
	#define IOV_MAX 1024

	ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
	ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
	#else
	#include <sys/uio.h>
	#endif

	#ifdef _WIN32
	static inline void qemu_timersub(const struct timeval *val1,
	const struct timeval *val2,
	struct timeval *res)
	{
	res->tv_sec = val1->tv_sec - val2->tv_sec;
	if (val1->tv_usec < val2->tv_usec) {
	res->tv_sec--;
	res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
	} else {
	res->tv_usec = val1->tv_usec - val2->tv_usec;
	}
	}
	#else
	#define qemu_timersub timersub
	#endif

	void qemu_set_cloexec(int fd);

	/* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
	* instead of QEMU_VERSION, so setting hw_version on MachineClass
	* is no longer mandatory.
	*
	* Do NOT change this string, or it will break compatibility on all
	* machine classes that don't set hw_version.
	*/
	#define QEMU_HW_VERSION "2.5+"

	/* QEMU "hardware version" setting. Used to replace code that exposed
	* QEMU_VERSION to guests in the past and need to keep compatibility.
	* Do not use qemu_hw_version() in new code.
	*/
	void qemu_set_hw_version(const char *);
	const char *qemu_hw_version(void);

	void fips_set_state(bool requested);
	bool fips_get_state(void);

	/* Return a dynamically allocated pathname denoting a file or directory that is
	* appropriate for storing local state.
	*
	* @relative_pathname need not start with a directory separator; one will be
	* added automatically.
	*
	* The caller is responsible for releasing the value returned with g_free()
	* after use.
	*/
	char qemu_get_local_state_pathname(const char relative_pathname);

	/* Find program directory, and save it for later usage with
	* qemu_get_exec_dir().
	* Try OS specific API first, if not working, parse from argv0. */
	void qemu_init_exec_dir(const char *argv0);

	/* Get the saved exec dir.
	* Caller needs to release the returned string by g_free() */
	char *qemu_get_exec_dir(void);

	/**
	* qemu_getauxval:
	* @type: the auxiliary vector key to lookup
	*
	* Search the auxiliary vector for @type, returning the value
	* or 0 if @type is not present.
	*/
	unsigned long qemu_getauxval(unsigned long type);

	void qemu_set_tty_echo(int fd, bool echo);

	void os_mem_prealloc(int fd, char area, size_t sz, Error *errp);

	int qemu_read_password(char *buf, int buf_size);

	/**
	* qemu_fork:
	*
	* A version of fork that avoids signal handler race
	* conditions that can lead to child process getting
	* signals that are otherwise only expected by the
	* parent. It also resets all signal handlers to the
	* default settings.
	*
	* Returns 0 to child process, pid number to parent
	* or -1 on failure.
	*/
	pid_t qemu_fork(Error **errp);

	#endif