xref: /qemu/include/qemu/osdep.h (revision 52ea63de)
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.h"
33 #else
34 #include "exec/poison.h"
35 #endif
36 #include "qemu/compiler.h"
37 
38 /* Older versions of C++ don't get definitions of various macros from
39  * stdlib.h unless we define these macros before first inclusion of
40  * that system header.
41  */
42 #ifndef __STDC_CONSTANT_MACROS
43 #define __STDC_CONSTANT_MACROS
44 #endif
45 #ifndef __STDC_LIMIT_MACROS
46 #define __STDC_LIMIT_MACROS
47 #endif
48 #ifndef __STDC_FORMAT_MACROS
49 #define __STDC_FORMAT_MACROS
50 #endif
51 
52 /* The following block of code temporarily renames the daemon() function so the
53  * compiler does not see the warning associated with it in stdlib.h on OSX
54  */
55 #ifdef __APPLE__
56 #define daemon qemu_fake_daemon_function
57 #include <stdlib.h>
58 #undef daemon
59 extern int daemon(int, int);
60 #endif
61 
62 #include <stdarg.h>
63 #include <stddef.h>
64 #include <stdbool.h>
65 #include <stdint.h>
66 #include <sys/types.h>
67 #include <stdlib.h>
68 #include <stdio.h>
69 #include <string.h>
70 #include <strings.h>
71 #include <inttypes.h>
72 #include <limits.h>
73 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
74  * function availability on recentish Mingw-w64 platforms. */
75 #include <unistd.h>
76 #include <time.h>
77 #include <ctype.h>
78 #include <errno.h>
79 #include <fcntl.h>
80 #include <sys/stat.h>
81 #include <sys/time.h>
82 #include <assert.h>
83 /* setjmp must be declared before sysemu/os-win32.h
84  * because it is redefined there. */
85 #include <setjmp.h>
86 #include <signal.h>
87 
88 #ifdef __OpenBSD__
89 #include <sys/signal.h>
90 #endif
91 
92 #ifndef _WIN32
93 #include <sys/wait.h>
94 #else
95 #define WIFEXITED(x)   1
96 #define WEXITSTATUS(x) (x)
97 #endif
98 
99 #ifdef _WIN32
100 #include "sysemu/os-win32.h"
101 #endif
102 
103 #ifdef CONFIG_POSIX
104 #include "sysemu/os-posix.h"
105 #endif
106 
107 #include "glib-compat.h"
108 #include "qemu/typedefs.h"
109 
110 #ifndef O_LARGEFILE
111 #define O_LARGEFILE 0
112 #endif
113 #ifndef O_BINARY
114 #define O_BINARY 0
115 #endif
116 #ifndef MAP_ANONYMOUS
117 #define MAP_ANONYMOUS MAP_ANON
118 #endif
119 #ifndef ENOMEDIUM
120 #define ENOMEDIUM ENODEV
121 #endif
122 #if !defined(ENOTSUP)
123 #define ENOTSUP 4096
124 #endif
125 #if !defined(ECANCELED)
126 #define ECANCELED 4097
127 #endif
128 #if !defined(EMEDIUMTYPE)
129 #define EMEDIUMTYPE 4098
130 #endif
131 #ifndef TIME_MAX
132 #define TIME_MAX LONG_MAX
133 #endif
134 
135 /* HOST_LONG_BITS is the size of a native pointer in bits. */
136 #if UINTPTR_MAX == UINT32_MAX
137 # define HOST_LONG_BITS 32
138 #elif UINTPTR_MAX == UINT64_MAX
139 # define HOST_LONG_BITS 64
140 #else
141 # error Unknown pointer size
142 #endif
143 
144 #ifndef MIN
145 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
146 #endif
147 #ifndef MAX
148 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
149 #endif
150 
151 /* Minimum function that returns zero only iff both values are zero.
152  * Intended for use with unsigned values only. */
153 #ifndef MIN_NON_ZERO
154 #define MIN_NON_ZERO(a, b) (((a) != 0 && (a) < (b)) ? (a) : (b))
155 #endif
156 
157 /* Round number down to multiple */
158 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
159 
160 /* Round number up to multiple */
161 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
162 
163 /* Check if n is a multiple of m */
164 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)
165 
166 /* n-byte align pointer down */
167 #define QEMU_ALIGN_PTR_DOWN(p, n) \
168     ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
169 
170 /* n-byte align pointer up */
171 #define QEMU_ALIGN_PTR_UP(p, n) \
172     ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))
173 
174 /* Check if pointer p is n-bytes aligned */
175 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
176 
177 #ifndef ROUND_UP
178 #define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
179 #endif
180 
181 #ifndef DIV_ROUND_UP
182 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
183 #endif
184 
185 #ifndef ARRAY_SIZE
186 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
187 #endif
188 
189 int qemu_daemon(int nochdir, int noclose);
190 void *qemu_try_memalign(size_t alignment, size_t size);
191 void *qemu_memalign(size_t alignment, size_t size);
192 void *qemu_anon_ram_alloc(size_t size, uint64_t *align);
193 void qemu_vfree(void *ptr);
194 void qemu_anon_ram_free(void *ptr, size_t size);
195 
196 #define QEMU_MADV_INVALID -1
197 
198 #if defined(CONFIG_MADVISE)
199 
200 #include <sys/mman.h>
201 
202 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
203 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
204 #ifdef MADV_DONTFORK
205 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
206 #else
207 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
208 #endif
209 #ifdef MADV_MERGEABLE
210 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
211 #else
212 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
213 #endif
214 #ifdef MADV_UNMERGEABLE
215 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
216 #else
217 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
218 #endif
219 #ifdef MADV_DODUMP
220 #define QEMU_MADV_DODUMP MADV_DODUMP
221 #else
222 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
223 #endif
224 #ifdef MADV_DONTDUMP
225 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
226 #else
227 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
228 #endif
229 #ifdef MADV_HUGEPAGE
230 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
231 #else
232 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
233 #endif
234 #ifdef MADV_NOHUGEPAGE
235 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
236 #else
237 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
238 #endif
239 
240 #elif defined(CONFIG_POSIX_MADVISE)
241 
242 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
243 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
244 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
245 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
246 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
247 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
248 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
249 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
250 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
251 
252 #else /* no-op */
253 
254 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
255 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
256 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
257 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
258 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
259 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
260 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
261 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
262 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
263 
264 #endif
265 
266 #if defined(__linux__) && \
267     (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__))
268    /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
269       Valgrind does not support alignments larger than 1 MiB,
270       therefore we need special code which handles running on Valgrind. */
271 #  define QEMU_VMALLOC_ALIGN (512 * 4096)
272 #elif defined(__linux__) && defined(__s390x__)
273    /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
274 #  define QEMU_VMALLOC_ALIGN (256 * 4096)
275 #else
276 #  define QEMU_VMALLOC_ALIGN getpagesize()
277 #endif
278 
279 int qemu_madvise(void *addr, size_t len, int advice);
280 
281 int qemu_open(const char *name, int flags, ...);
282 int qemu_close(int fd);
283 
284 #if defined(__HAIKU__) && defined(__i386__)
285 #define FMT_pid "%ld"
286 #elif defined(WIN64)
287 #define FMT_pid "%" PRId64
288 #else
289 #define FMT_pid "%d"
290 #endif
291 
292 int qemu_create_pidfile(const char *filename);
293 int qemu_get_thread_id(void);
294 
295 #ifndef CONFIG_IOVEC
296 struct iovec {
297     void *iov_base;
298     size_t iov_len;
299 };
300 /*
301  * Use the same value as Linux for now.
302  */
303 #define IOV_MAX 1024
304 
305 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
306 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
307 #else
308 #include <sys/uio.h>
309 #endif
310 
311 #ifdef _WIN32
312 static inline void qemu_timersub(const struct timeval *val1,
313                                  const struct timeval *val2,
314                                  struct timeval *res)
315 {
316     res->tv_sec = val1->tv_sec - val2->tv_sec;
317     if (val1->tv_usec < val2->tv_usec) {
318         res->tv_sec--;
319         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
320     } else {
321         res->tv_usec = val1->tv_usec - val2->tv_usec;
322     }
323 }
324 #else
325 #define qemu_timersub timersub
326 #endif
327 
328 void qemu_set_cloexec(int fd);
329 
330 /* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
331  * instead of QEMU_VERSION, so setting hw_version on MachineClass
332  * is no longer mandatory.
333  *
334  * Do NOT change this string, or it will break compatibility on all
335  * machine classes that don't set hw_version.
336  */
337 #define QEMU_HW_VERSION "2.5+"
338 
339 /* QEMU "hardware version" setting. Used to replace code that exposed
340  * QEMU_VERSION to guests in the past and need to keep compatibility.
341  * Do not use qemu_hw_version() in new code.
342  */
343 void qemu_set_hw_version(const char *);
344 const char *qemu_hw_version(void);
345 
346 void fips_set_state(bool requested);
347 bool fips_get_state(void);
348 
349 /* Return a dynamically allocated pathname denoting a file or directory that is
350  * appropriate for storing local state.
351  *
352  * @relative_pathname need not start with a directory separator; one will be
353  * added automatically.
354  *
355  * The caller is responsible for releasing the value returned with g_free()
356  * after use.
357  */
358 char *qemu_get_local_state_pathname(const char *relative_pathname);
359 
360 /* Find program directory, and save it for later usage with
361  * qemu_get_exec_dir().
362  * Try OS specific API first, if not working, parse from argv0. */
363 void qemu_init_exec_dir(const char *argv0);
364 
365 /* Get the saved exec dir.
366  * Caller needs to release the returned string by g_free() */
367 char *qemu_get_exec_dir(void);
368 
369 /**
370  * qemu_getauxval:
371  * @type: the auxiliary vector key to lookup
372  *
373  * Search the auxiliary vector for @type, returning the value
374  * or 0 if @type is not present.
375  */
376 unsigned long qemu_getauxval(unsigned long type);
377 
378 void qemu_set_tty_echo(int fd, bool echo);
379 
380 void os_mem_prealloc(int fd, char *area, size_t sz);
381 
382 int qemu_read_password(char *buf, int buf_size);
383 
384 /**
385  * qemu_fork:
386  *
387  * A version of fork that avoids signal handler race
388  * conditions that can lead to child process getting
389  * signals that are otherwise only expected by the
390  * parent. It also resets all signal handlers to the
391  * default settings.
392  *
393  * Returns 0 to child process, pid number to parent
394  * or -1 on failure.
395  */
396 pid_t qemu_fork(Error **errp);
397 
398 #endif
399