619d144751
Check for overflow to avoid that fseek() receives a sign-extended value. Cc: Dorjoy Chowdhury <dorjoychy111@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
836 lines
25 KiB
C
836 lines
25 KiB
C
/*
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* OS includes and handling of OS dependencies
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*
|
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* This header exists to pull in some common system headers that
|
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* most code in QEMU will want, and to fix up some possible issues with
|
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* it (missing defines, Windows weirdness, and so on).
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*
|
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* To avoid getting into possible circular include dependencies, this
|
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* file should not include any other QEMU headers, with the exceptions
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* of config-host.h, config-target.h, qemu/compiler.h,
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* sysemu/os-posix.h, sysemu/os-win32.h, glib-compat.h and
|
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* qemu/typedefs.h, all of which are doing a similar job to this file
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* and are under similar constraints.
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*
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* This header also contains prototypes for functions defined in
|
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* os-*.c and util/oslib-*.c; those would probably be better split
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* out into separate header files.
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*
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* In an ideal world this header would contain only:
|
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* (1) things which everybody needs
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* (2) things without which code would work on most platforms but
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* fail to compile or misbehave on a minority of host OSes
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_OSDEP_H
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#define QEMU_OSDEP_H
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#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ && defined __linux__
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# define _FORTIFY_SOURCE 2
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#endif
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|
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#include "config-host.h"
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#ifdef COMPILING_PER_TARGET
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#include CONFIG_TARGET
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#else
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#include "exec/poison.h"
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#endif
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/*
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* HOST_WORDS_BIGENDIAN was replaced with HOST_BIG_ENDIAN. Prevent it from
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* creeping back in.
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*/
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#pragma GCC poison HOST_WORDS_BIGENDIAN
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/*
|
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* TARGET_WORDS_BIGENDIAN was replaced with TARGET_BIG_ENDIAN. Prevent it from
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* creeping back in.
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*/
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#pragma GCC poison TARGET_WORDS_BIGENDIAN
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|
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#include "qemu/compiler.h"
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|
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/* Older versions of C++ don't get definitions of various macros from
|
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* stdlib.h unless we define these macros before first inclusion of
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* that system header.
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*/
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#ifndef __STDC_CONSTANT_MACROS
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#define __STDC_CONSTANT_MACROS
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#endif
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#ifndef __STDC_LIMIT_MACROS
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#define __STDC_LIMIT_MACROS
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#endif
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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|
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/* The following block of code temporarily renames the daemon() function so the
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* compiler does not see the warning associated with it in stdlib.h on OSX
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*/
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#ifdef __APPLE__
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#define daemon qemu_fake_daemon_function
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#include <stdlib.h>
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#undef daemon
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QEMU_EXTERN_C int daemon(int, int);
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#endif
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#ifdef _WIN32
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/* as defined in sdkddkver.h */
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0602 /* Windows 8 API (should be >= the one from glib) */
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#endif
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/* reduces the number of implicitly included headers */
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#endif
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|
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/* enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later) */
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#ifdef __MINGW32__
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#define __USE_MINGW_ANSI_STDIO 1
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#endif
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|
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/*
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* We need the FreeBSD "legacy" definitions. Rust needs the FreeBSD 11 system
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* calls since it doesn't use libc at all, so we have to emulate that despite
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* FreeBSD 11 being EOL'd.
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*/
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#ifdef __FreeBSD__
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#define _WANT_FREEBSD11_STAT
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#define _WANT_FREEBSD11_STATFS
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#define _WANT_FREEBSD11_DIRENT
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#define _WANT_KERNEL_ERRNO
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#define _WANT_SEMUN
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#endif
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdio.h>
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|
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#include <string.h>
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#include <strings.h>
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#include <inttypes.h>
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#include <limits.h>
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/* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
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* function availability on recentish Mingw-w64 platforms. */
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#include <unistd.h>
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#include <time.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <assert.h>
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/* setjmp must be declared before sysemu/os-win32.h
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* because it is redefined there. */
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#include <setjmp.h>
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#include <signal.h>
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|
|
|
#ifdef CONFIG_IOVEC
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#include <sys/uio.h>
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#endif
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|
|
#if defined(__linux__) && defined(__sparc__)
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/* The SPARC definition of QEMU_VMALLOC_ALIGN needs SHMLBA */
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#include <sys/shm.h>
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#endif
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|
|
|
#ifndef _WIN32
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|
#include <sys/wait.h>
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|
#else
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#define WIFEXITED(x) 1
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#define WEXITSTATUS(x) (x)
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|
#endif
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|
|
|
#ifdef __APPLE__
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|
#include <AvailabilityMacros.h>
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#endif
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|
|
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/*
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* This is somewhat like a system header; it must be outside any extern "C"
|
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* block because it includes system headers itself, including glib.h,
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* which will not compile if inside an extern "C" block.
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*/
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#include "glib-compat.h"
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|
|
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#ifdef _WIN32
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#include "sysemu/os-win32.h"
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#endif
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|
|
#ifdef CONFIG_POSIX
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#include "sysemu/os-posix.h"
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|
#endif
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|
|
#ifdef __cplusplus
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extern "C" {
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|
#endif
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|
|
|
#include "qemu/typedefs.h"
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|
|
|
/**
|
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* Mark a function that executes in coroutine context
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*
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* Functions that execute in coroutine context cannot be called directly from
|
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* normal functions. In the future it would be nice to enable compiler or
|
|
* static checker support for catching such errors. This annotation might make
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* it possible and in the meantime it serves as documentation.
|
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*
|
|
* For example:
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*
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* static void coroutine_fn foo(void) {
|
|
* ....
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* }
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|
*/
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#ifdef __clang__
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#define coroutine_fn QEMU_ANNOTATE("coroutine_fn")
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#else
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#define coroutine_fn
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#endif
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/**
|
|
* Mark a function that can suspend when executed in coroutine context,
|
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* but can handle running in non-coroutine context too.
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|
*/
|
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#ifdef __clang__
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#define coroutine_mixed_fn QEMU_ANNOTATE("coroutine_mixed_fn")
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#else
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#define coroutine_mixed_fn
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#endif
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|
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/**
|
|
* Mark a function that should not be called from a coroutine context.
|
|
* Usually there will be an analogous, coroutine_fn function that should
|
|
* be used instead.
|
|
*
|
|
* When the function is also marked as coroutine_mixed_fn, the function should
|
|
* only be called if the caller does not know whether it is in coroutine
|
|
* context.
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*
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|
* Functions that are only no_coroutine_fn, on the other hand, should not
|
|
* be called from within coroutines at all. This for example includes
|
|
* functions that block.
|
|
*
|
|
* In the future it would be nice to enable compiler or static checker
|
|
* support for catching such errors. This annotation is the first step
|
|
* towards this, and in the meantime it serves as documentation.
|
|
*
|
|
* For example:
|
|
*
|
|
* static void no_coroutine_fn foo(void) {
|
|
* ....
|
|
* }
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|
*/
|
|
#ifdef __clang__
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|
#define no_coroutine_fn QEMU_ANNOTATE("no_coroutine_fn")
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#else
|
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#define no_coroutine_fn
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#endif
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|
|
|
|
/*
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|
* For mingw, as of v6.0.0, the function implementing the assert macro is
|
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* not marked as noreturn, so the compiler cannot delete code following an
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* assert(false) as unused. We rely on this within the code base to delete
|
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* code that is unreachable when features are disabled.
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* All supported versions of Glib's g_assert() satisfy this requirement.
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|
*/
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|
#ifdef __MINGW32__
|
|
#undef assert
|
|
#define assert(x) g_assert(x)
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|
#endif
|
|
|
|
/**
|
|
* qemu_build_not_reached()
|
|
*
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|
* The compiler, during optimization, is expected to prove that a call
|
|
* to this function cannot be reached and remove it. If the compiler
|
|
* supports QEMU_ERROR, this will be reported at compile time; otherwise
|
|
* this will be reported at link time due to the missing symbol.
|
|
*/
|
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G_NORETURN
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void QEMU_ERROR("code path is reachable")
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qemu_build_not_reached_always(void);
|
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#if defined(__OPTIMIZE__) && !defined(__NO_INLINE__)
|
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#define qemu_build_not_reached() qemu_build_not_reached_always()
|
|
#else
|
|
#define qemu_build_not_reached() g_assert_not_reached()
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|
#endif
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|
|
|
/**
|
|
* qemu_build_assert()
|
|
*
|
|
* The compiler, during optimization, is expected to prove that the
|
|
* assertion is true.
|
|
*/
|
|
#define qemu_build_assert(test) while (!(test)) qemu_build_not_reached()
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|
|
/*
|
|
* According to waitpid man page:
|
|
* WCOREDUMP
|
|
* This macro is not specified in POSIX.1-2001 and is not
|
|
* available on some UNIX implementations (e.g., AIX, SunOS).
|
|
* Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif.
|
|
*/
|
|
#ifndef WCOREDUMP
|
|
#define WCOREDUMP(status) 0
|
|
#endif
|
|
/*
|
|
* We have a lot of unaudited code that may fail in strange ways, or
|
|
* even be a security risk during migration, if you disable assertions
|
|
* at compile-time. You may comment out these safety checks if you
|
|
* absolutely want to disable assertion overhead, but it is not
|
|
* supported upstream so the risk is all yours. Meanwhile, please
|
|
* submit patches to remove any side-effects inside an assertion, or
|
|
* fixing error handling that should use Error instead of assert.
|
|
*/
|
|
#ifdef NDEBUG
|
|
#error building with NDEBUG is not supported
|
|
#endif
|
|
#ifdef G_DISABLE_ASSERT
|
|
#error building with G_DISABLE_ASSERT is not supported
|
|
#endif
|
|
|
|
#ifndef OFF_MAX
|
|
#define OFF_MAX (sizeof (off_t) == 8 ? INT64_MAX : INT32_MAX)
|
|
#endif
|
|
|
|
#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 MAP_NORESERVE
|
|
#define MAP_NORESERVE 0
|
|
#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
|
|
#if !defined(ESHUTDOWN)
|
|
#define ESHUTDOWN 4099
|
|
#endif
|
|
|
|
#define RETRY_ON_EINTR(expr) \
|
|
(__extension__ \
|
|
({ typeof(expr) __result; \
|
|
do { \
|
|
__result = (expr); \
|
|
} while (__result == -1 && errno == EINTR); \
|
|
__result; }))
|
|
|
|
/* time_t may be either 32 or 64 bits depending on the host OS, and
|
|
* can be either signed or unsigned, so we can't just hardcode a
|
|
* specific maximum value. This is not a C preprocessor constant,
|
|
* so you can't use TIME_MAX in an #ifdef, but for our purposes
|
|
* this isn't a problem.
|
|
*/
|
|
|
|
/* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from
|
|
* Gnulib, and are under the LGPL v2.1 or (at your option) any
|
|
* later version.
|
|
*/
|
|
|
|
/* True if the real type T is signed. */
|
|
#define TYPE_SIGNED(t) (!((t)0 < (t)-1))
|
|
|
|
/* The width in bits of the integer type or expression T.
|
|
* Padding bits are not supported.
|
|
*/
|
|
#define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT)
|
|
|
|
/* The maximum and minimum values for the integer type T. */
|
|
#define TYPE_MAXIMUM(t) \
|
|
((t) (!TYPE_SIGNED(t) \
|
|
? (t)-1 \
|
|
: ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1)))
|
|
|
|
#ifndef TIME_MAX
|
|
#define TIME_MAX TYPE_MAXIMUM(time_t)
|
|
#endif
|
|
|
|
/* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with
|
|
* the wrong type. Our replacement isn't usable in preprocessor
|
|
* expressions, but it is sufficient for our needs. */
|
|
#ifdef HAVE_BROKEN_SIZE_MAX
|
|
#undef SIZE_MAX
|
|
#define SIZE_MAX ((size_t)-1)
|
|
#endif
|
|
|
|
/*
|
|
* Two variations of MIN/MAX macros. The first is for runtime use, and
|
|
* evaluates arguments only once (so it is safe even with side
|
|
* effects), but will not work in constant contexts (such as array
|
|
* size declarations) because of the '{}'. The second is for constant
|
|
* expression use, where evaluating arguments twice is safe because
|
|
* the result is going to be constant anyway, but will not work in a
|
|
* runtime context because of a void expression where a value is
|
|
* expected. Thus, both gcc and clang will fail to compile if you use
|
|
* the wrong macro (even if the error may seem a bit cryptic).
|
|
*
|
|
* Note that neither form is usable as an #if condition; if you truly
|
|
* need to write conditional code that depends on a minimum or maximum
|
|
* determined by the pre-processor instead of the compiler, you'll
|
|
* have to open-code it. Sadly, Coverity is severely confused by the
|
|
* constant variants, so we have to dumb things down there.
|
|
*
|
|
* Preprocessor sorcery ahead: use different identifiers for the local
|
|
* variables in each expansion, so we can nest macro calls without
|
|
* shadowing variables.
|
|
*/
|
|
#define MIN_INTERNAL(a, b, _a, _b) \
|
|
({ \
|
|
typeof(1 ? (a) : (b)) _a = (a), _b = (b); \
|
|
_a < _b ? _a : _b; \
|
|
})
|
|
#undef MIN
|
|
#define MIN(a, b) \
|
|
MIN_INTERNAL((a), (b), MAKE_IDENTIFIER(_a), MAKE_IDENTIFIER(_b))
|
|
|
|
#define MAX_INTERNAL(a, b, _a, _b) \
|
|
({ \
|
|
typeof(1 ? (a) : (b)) _a = (a), _b = (b); \
|
|
_a > _b ? _a : _b; \
|
|
})
|
|
#undef MAX
|
|
#define MAX(a, b) \
|
|
MAX_INTERNAL((a), (b), MAKE_IDENTIFIER(_a), MAKE_IDENTIFIER(_b))
|
|
|
|
#ifdef __COVERITY__
|
|
# define MIN_CONST(a, b) ((a) < (b) ? (a) : (b))
|
|
# define MAX_CONST(a, b) ((a) > (b) ? (a) : (b))
|
|
#else
|
|
# define MIN_CONST(a, b) \
|
|
__builtin_choose_expr( \
|
|
__builtin_constant_p(a) && __builtin_constant_p(b), \
|
|
(a) < (b) ? (a) : (b), \
|
|
((void)0))
|
|
# define MAX_CONST(a, b) \
|
|
__builtin_choose_expr( \
|
|
__builtin_constant_p(a) && __builtin_constant_p(b), \
|
|
(a) > (b) ? (a) : (b), \
|
|
((void)0))
|
|
#endif
|
|
|
|
/*
|
|
* Minimum function that returns zero only if both values are zero.
|
|
* Intended for use with unsigned values only.
|
|
*
|
|
* Preprocessor sorcery ahead: use different identifiers for the local
|
|
* variables in each expansion, so we can nest macro calls without
|
|
* shadowing variables.
|
|
*/
|
|
#define MIN_NON_ZERO_INTERNAL(a, b, _a, _b) \
|
|
({ \
|
|
typeof(1 ? (a) : (b)) _a = (a), _b = (b); \
|
|
_a == 0 ? _b : (_b == 0 || _b > _a) ? _a : _b; \
|
|
})
|
|
#define MIN_NON_ZERO(a, b) \
|
|
MIN_NON_ZERO_INTERNAL((a), (b), MAKE_IDENTIFIER(_a), MAKE_IDENTIFIER(_b))
|
|
|
|
/*
|
|
* Round number down to multiple. Safe when m is not a power of 2 (see
|
|
* ROUND_DOWN for a faster version when a power of 2 is guaranteed).
|
|
*/
|
|
#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 down to multiple. Requires that d be a power of 2 (see
|
|
* QEMU_ALIGN_UP for a safer but slower version on arbitrary
|
|
* numbers); works even if d is a smaller type than n.
|
|
*/
|
|
#ifndef ROUND_DOWN
|
|
#define ROUND_DOWN(n, d) ((n) & -(0 ? (n) : (d)))
|
|
#endif
|
|
|
|
/*
|
|
* 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); works even if d is a smaller type than n.
|
|
*/
|
|
#ifndef ROUND_UP
|
|
#define ROUND_UP(n, d) ROUND_DOWN((n) + (d) - 1, (d))
|
|
#endif
|
|
|
|
#ifndef DIV_ROUND_UP
|
|
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
|
|
#endif
|
|
|
|
/*
|
|
* &(x)[0] is always a pointer - if it's same type as x then the argument is a
|
|
* pointer, not an array.
|
|
*/
|
|
#define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \
|
|
typeof(&(x)[0])))
|
|
#ifndef ARRAY_SIZE
|
|
#define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \
|
|
QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x)))
|
|
#endif
|
|
|
|
int qemu_daemon(int nochdir, int noclose);
|
|
void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared,
|
|
bool noreserve);
|
|
void qemu_anon_ram_free(void *ptr, size_t size);
|
|
|
|
#ifdef _WIN32
|
|
#define HAVE_CHARDEV_SERIAL 1
|
|
#define HAVE_CHARDEV_PARALLEL 1
|
|
#else
|
|
#if defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
|
|
|| defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
|
|
|| defined(__GLIBC__) || defined(__APPLE__)
|
|
#define HAVE_CHARDEV_SERIAL 1
|
|
#endif
|
|
#if defined(__linux__) || defined(__FreeBSD__) \
|
|
|| defined(__FreeBSD_kernel__) || defined(__DragonFly__)
|
|
#define HAVE_CHARDEV_PARALLEL 1
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(__HAIKU__)
|
|
#define SIGIO SIGPOLL
|
|
#endif
|
|
|
|
#ifdef HAVE_MADVISE_WITHOUT_PROTOTYPE
|
|
/*
|
|
* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for discussion
|
|
* about Solaris missing the madvise() prototype.
|
|
*/
|
|
int madvise(char *, size_t, int);
|
|
#endif
|
|
|
|
#if defined(CONFIG_LINUX)
|
|
#ifndef BUS_MCEERR_AR
|
|
#define BUS_MCEERR_AR 4
|
|
#endif
|
|
#ifndef BUS_MCEERR_AO
|
|
#define BUS_MCEERR_AO 5
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(__linux__) && \
|
|
(defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
|
|
|| defined(__powerpc64__))
|
|
/* 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)
|
|
#elif defined(__linux__) && defined(__sparc__)
|
|
# define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size(), SHMLBA)
|
|
#elif defined(__linux__) && defined(__loongarch__)
|
|
/*
|
|
* For transparent hugepage optimization, it has better be huge page
|
|
* aligned. LoongArch host system supports two kinds of pagesize: 4K
|
|
* and 16K, here calculate huge page size from host page size
|
|
*/
|
|
# define QEMU_VMALLOC_ALIGN (qemu_real_host_page_size() * \
|
|
qemu_real_host_page_size() / sizeof(long))
|
|
#else
|
|
# define QEMU_VMALLOC_ALIGN qemu_real_host_page_size()
|
|
#endif
|
|
|
|
#ifdef CONFIG_POSIX
|
|
struct qemu_signalfd_siginfo {
|
|
uint32_t ssi_signo; /* Signal number */
|
|
int32_t ssi_errno; /* Error number (unused) */
|
|
int32_t ssi_code; /* Signal code */
|
|
uint32_t ssi_pid; /* PID of sender */
|
|
uint32_t ssi_uid; /* Real UID of sender */
|
|
int32_t ssi_fd; /* File descriptor (SIGIO) */
|
|
uint32_t ssi_tid; /* Kernel timer ID (POSIX timers) */
|
|
uint32_t ssi_band; /* Band event (SIGIO) */
|
|
uint32_t ssi_overrun; /* POSIX timer overrun count */
|
|
uint32_t ssi_trapno; /* Trap number that caused signal */
|
|
int32_t ssi_status; /* Exit status or signal (SIGCHLD) */
|
|
int32_t ssi_int; /* Integer sent by sigqueue(2) */
|
|
uint64_t ssi_ptr; /* Pointer sent by sigqueue(2) */
|
|
uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */
|
|
uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */
|
|
uint64_t ssi_addr; /* Address that generated signal
|
|
(for hardware-generated signals) */
|
|
uint8_t pad[48]; /* Pad size to 128 bytes (allow for
|
|
additional fields in the future) */
|
|
};
|
|
|
|
int qemu_signalfd(const sigset_t *mask);
|
|
void sigaction_invoke(struct sigaction *action,
|
|
struct qemu_signalfd_siginfo *info);
|
|
#endif
|
|
|
|
/*
|
|
* Don't introduce new usage of this function, prefer the following
|
|
* qemu_open/qemu_create that take an "Error **errp"
|
|
*/
|
|
int qemu_open_old(const char *name, int flags, ...);
|
|
int qemu_open(const char *name, int flags, Error **errp);
|
|
int qemu_create(const char *name, int flags, mode_t mode, Error **errp);
|
|
int qemu_close(int fd);
|
|
int qemu_unlink(const char *name);
|
|
#ifndef _WIN32
|
|
int qemu_dup_flags(int fd, int flags);
|
|
int qemu_dup(int fd);
|
|
int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
|
|
int qemu_unlock_fd(int fd, int64_t start, int64_t len);
|
|
int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive);
|
|
bool qemu_has_ofd_lock(void);
|
|
#endif
|
|
|
|
bool qemu_has_direct_io(void);
|
|
|
|
#if defined(__HAIKU__) && defined(__i386__)
|
|
#define FMT_pid "%ld"
|
|
#elif defined(WIN64)
|
|
#define FMT_pid "%" PRId64
|
|
#else
|
|
#define FMT_pid "%d"
|
|
#endif
|
|
|
|
bool qemu_write_pidfile(const char *pidfile, Error **errp);
|
|
|
|
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);
|
|
#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
|
|
|
|
ssize_t qemu_write_full(int fd, const void *buf, size_t count)
|
|
G_GNUC_WARN_UNUSED_RESULT;
|
|
|
|
void qemu_set_cloexec(int fd);
|
|
|
|
/* Return a dynamically allocated directory path that is appropriate for storing
|
|
* local state.
|
|
*
|
|
* The caller is responsible for releasing the value returned with g_free()
|
|
* after use.
|
|
*/
|
|
char *qemu_get_local_state_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);
|
|
|
|
typedef struct ThreadContext ThreadContext;
|
|
|
|
/**
|
|
* qemu_prealloc_mem:
|
|
* @fd: the fd mapped into the area, -1 for anonymous memory
|
|
* @area: start address of the are to preallocate
|
|
* @sz: the size of the area to preallocate
|
|
* @max_threads: maximum number of threads to use
|
|
* @tc: prealloc context threads pointer, NULL if not in use
|
|
* @async: request asynchronous preallocation, requires @tc
|
|
* @errp: returns an error if this function fails
|
|
*
|
|
* Preallocate memory (populate/prefault page tables writable) for the virtual
|
|
* memory area starting at @area with the size of @sz. After a successful call,
|
|
* each page in the area was faulted in writable at least once, for example,
|
|
* after allocating file blocks for mapped files.
|
|
*
|
|
* When setting @async, allocation might be performed asynchronously.
|
|
* qemu_finish_async_prealloc_mem() must be called to finish any asynchronous
|
|
* preallocation.
|
|
*
|
|
* Return: true on success, else false setting @errp with error.
|
|
*/
|
|
bool qemu_prealloc_mem(int fd, char *area, size_t sz, int max_threads,
|
|
ThreadContext *tc, bool async, Error **errp);
|
|
|
|
/**
|
|
* qemu_finish_async_prealloc_mem:
|
|
* @errp: returns an error if this function fails
|
|
*
|
|
* Finish all outstanding asynchronous memory preallocation.
|
|
*
|
|
* Return: true on success, else false setting @errp with error.
|
|
*/
|
|
bool qemu_finish_async_prealloc_mem(Error **errp);
|
|
|
|
/**
|
|
* qemu_get_pid_name:
|
|
* @pid: pid of a process
|
|
*
|
|
* For given @pid fetch its name. Caller is responsible for
|
|
* freeing the string when no longer needed.
|
|
* Returns allocated string on success, NULL on failure.
|
|
*/
|
|
char *qemu_get_pid_name(pid_t pid);
|
|
|
|
/* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
|
|
* when intptr_t is 32-bit and we are aligning a long long.
|
|
*/
|
|
static inline uintptr_t qemu_real_host_page_size(void)
|
|
{
|
|
return getpagesize();
|
|
}
|
|
|
|
static inline intptr_t qemu_real_host_page_mask(void)
|
|
{
|
|
return -(intptr_t)qemu_real_host_page_size();
|
|
}
|
|
|
|
/*
|
|
* After using getopt or getopt_long, if you need to parse another set
|
|
* of options, then you must reset optind. Unfortunately the way to
|
|
* do this varies between implementations of getopt.
|
|
*/
|
|
static inline void qemu_reset_optind(void)
|
|
{
|
|
#ifdef HAVE_OPTRESET
|
|
optind = 1;
|
|
optreset = 1;
|
|
#else
|
|
optind = 0;
|
|
#endif
|
|
}
|
|
|
|
int qemu_fdatasync(int fd);
|
|
|
|
/**
|
|
* qemu_close_all_open_fd:
|
|
*
|
|
* Close all open file descriptors except the ones supplied in the @skip array
|
|
*
|
|
* @skip: ordered array of distinct file descriptors that should not be closed
|
|
* if any, or NULL.
|
|
* @nskip: number of entries in the @skip array or 0 if @skip is NULL.
|
|
*/
|
|
void qemu_close_all_open_fd(const int *skip, unsigned int nskip);
|
|
|
|
/**
|
|
* Sync changes made to the memory mapped file back to the backing
|
|
* storage. For POSIX compliant systems this will fallback
|
|
* to regular msync call. Otherwise it will trigger whole file sync
|
|
* (including the metadata case there is no support to skip that otherwise)
|
|
*
|
|
* @addr - start of the memory area to be synced
|
|
* @length - length of the are to be synced
|
|
* @fd - file descriptor for the file to be synced
|
|
* (mandatory only for POSIX non-compliant systems)
|
|
*/
|
|
int qemu_msync(void *addr, size_t length, int fd);
|
|
|
|
/**
|
|
* qemu_get_host_physmem:
|
|
*
|
|
* Operating system agnostic way of querying host memory.
|
|
*
|
|
* Returns amount of physical memory on the system. This is purely
|
|
* advisery and may return 0 if we can't work it out. At the other
|
|
* end we saturate to SIZE_MAX if you are lucky enough to have that
|
|
* much memory.
|
|
*/
|
|
size_t qemu_get_host_physmem(void);
|
|
|
|
/*
|
|
* Toggle write/execute on the pages marked MAP_JIT
|
|
* for the current thread.
|
|
*/
|
|
#ifdef __APPLE__
|
|
static inline void qemu_thread_jit_execute(void)
|
|
{
|
|
pthread_jit_write_protect_np(true);
|
|
}
|
|
|
|
static inline void qemu_thread_jit_write(void)
|
|
{
|
|
pthread_jit_write_protect_np(false);
|
|
}
|
|
#else
|
|
static inline void qemu_thread_jit_write(void) {}
|
|
static inline void qemu_thread_jit_execute(void) {}
|
|
#endif
|
|
|
|
/**
|
|
* Platforms which do not support system() return ENOSYS
|
|
*/
|
|
#ifndef HAVE_SYSTEM_FUNCTION
|
|
#define system platform_does_not_support_system
|
|
static inline int platform_does_not_support_system(const char *command)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
#endif /* !HAVE_SYSTEM_FUNCTION */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|