2 * OS includes and handling of OS dependencies
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).
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, compiler.h, os-posix.h and os-win32.h, all of which
11 * are doing a similar job to this file and are under similar constraints.
13 * This header also contains prototypes for functions defined in
14 * os-*.c and util/oslib-*.c; those would probably be better split
15 * out into separate header files.
17 * In an ideal world this header would contain only:
18 * (1) things which everybody needs
19 * (2) things without which code would work on most platforms but
20 * fail to compile or misbehave on a minority of host OSes
22 * This work is licensed under the terms of the GNU GPL, version 2 or later.
23 * See the COPYING file in the top-level directory.
28 #include "config-host.h"
29 #include "qemu/compiler.h"
34 #include <sys/types.h>
41 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
42 * function availability on recentish Mingw-w64 platforms. */
54 #include <sys/signal.h>
60 #define WIFEXITED(x) 1
61 #define WEXITSTATUS(x) (x)
65 #include "sysemu/os-win32.h"
69 #include "sysemu/os-posix.h"
72 #include "qapi/error.h"
74 #if defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10
75 /* [u]int_fast*_t not in <sys/int_types.h> */
76 typedef unsigned char uint_fast8_t;
77 typedef unsigned int uint_fast16_t;
78 typedef signed int int_fast16_t;
88 #define MAP_ANONYMOUS MAP_ANON
91 #define ENOMEDIUM ENODEV
96 #if !defined(ECANCELED)
97 #define ECANCELED 4097
99 #if !defined(EMEDIUMTYPE)
100 #define EMEDIUMTYPE 4098
103 #define TIME_MAX LONG_MAX
107 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
110 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
113 /* Minimum function that returns zero only iff both values are zero.
114 * Intended for use with unsigned values only. */
116 #define MIN_NON_ZERO(a, b) (((a) != 0 && (a) < (b)) ? (a) : (b))
120 #define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
124 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
128 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
131 int qemu_daemon(int nochdir
, int noclose
);
132 void *qemu_try_memalign(size_t alignment
, size_t size
);
133 void *qemu_memalign(size_t alignment
, size_t size
);
134 void *qemu_anon_ram_alloc(size_t size
, uint64_t *align
);
135 void qemu_vfree(void *ptr
);
136 void qemu_anon_ram_free(void *ptr
, size_t size
);
138 #define QEMU_MADV_INVALID -1
140 #if defined(CONFIG_MADVISE)
142 #include <sys/mman.h>
144 #define QEMU_MADV_WILLNEED MADV_WILLNEED
145 #define QEMU_MADV_DONTNEED MADV_DONTNEED
147 #define QEMU_MADV_DONTFORK MADV_DONTFORK
149 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID
151 #ifdef MADV_MERGEABLE
152 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
154 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
156 #ifdef MADV_UNMERGEABLE
157 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
159 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
162 #define QEMU_MADV_DODUMP MADV_DODUMP
164 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
167 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
169 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
172 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
174 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
176 #ifdef MADV_NOHUGEPAGE
177 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
179 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
182 #elif defined(CONFIG_POSIX_MADVISE)
184 #define QEMU_MADV_WILLNEED POSIX_MADV_WILLNEED
185 #define QEMU_MADV_DONTNEED POSIX_MADV_DONTNEED
186 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID
187 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
188 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
189 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
190 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
191 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
192 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
196 #define QEMU_MADV_WILLNEED QEMU_MADV_INVALID
197 #define QEMU_MADV_DONTNEED QEMU_MADV_INVALID
198 #define QEMU_MADV_DONTFORK QEMU_MADV_INVALID
199 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
200 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
201 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
202 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
203 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
204 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
208 int qemu_madvise(void *addr
, size_t len
, int advice
);
210 int qemu_open(const char *name
, int flags
, ...);
211 int qemu_close(int fd
);
213 #if defined(__HAIKU__) && defined(__i386__)
214 #define FMT_pid "%ld"
216 #define FMT_pid "%" PRId64
221 int qemu_create_pidfile(const char *filename
);
222 int qemu_get_thread_id(void);
230 * Use the same value as Linux for now.
234 ssize_t
readv(int fd
, const struct iovec
*iov
, int iov_cnt
);
235 ssize_t
writev(int fd
, const struct iovec
*iov
, int iov_cnt
);
241 static inline void qemu_timersub(const struct timeval
*val1
,
242 const struct timeval
*val2
,
245 res
->tv_sec
= val1
->tv_sec
- val2
->tv_sec
;
246 if (val1
->tv_usec
< val2
->tv_usec
) {
248 res
->tv_usec
= val1
->tv_usec
- val2
->tv_usec
+ 1000 * 1000;
250 res
->tv_usec
= val1
->tv_usec
- val2
->tv_usec
;
254 #define qemu_timersub timersub
257 void qemu_set_cloexec(int fd
);
259 /* QEMU "hardware version" setting. Used to replace code that exposed
260 * QEMU_VERSION to guests in the past and need to keep compatibilty.
261 * Do not use qemu_hw_version() in new code.
263 void qemu_set_hw_version(const char *);
264 const char *qemu_hw_version(void);
266 void fips_set_state(bool requested
);
267 bool fips_get_state(void);
269 /* Return a dynamically allocated pathname denoting a file or directory that is
270 * appropriate for storing local state.
272 * @relative_pathname need not start with a directory separator; one will be
273 * added automatically.
275 * The caller is responsible for releasing the value returned with g_free()
278 char *qemu_get_local_state_pathname(const char *relative_pathname
);
280 /* Find program directory, and save it for later usage with
281 * qemu_get_exec_dir().
282 * Try OS specific API first, if not working, parse from argv0. */
283 void qemu_init_exec_dir(const char *argv0
);
285 /* Get the saved exec dir.
286 * Caller needs to release the returned string by g_free() */
287 char *qemu_get_exec_dir(void);
291 * @type: the auxiliary vector key to lookup
293 * Search the auxiliary vector for @type, returning the value
294 * or 0 if @type is not present.
296 unsigned long qemu_getauxval(unsigned long type
);
298 void qemu_set_tty_echo(int fd
, bool echo
);
300 void os_mem_prealloc(int fd
, char *area
, size_t sz
);
302 int qemu_read_password(char *buf
, int buf_size
);
307 * A version of fork that avoids signal handler race
308 * conditions that can lead to child process getting
309 * signals that are otherwise only expected by the
310 * parent. It also resets all signal handlers to the
313 * Returns 0 to child process, pid number to parent
316 pid_t
qemu_fork(Error
**errp
);