nbd: Don't use *_to_cpup() functions
[qemu.git] / util / osdep.c
1 /*
2 * QEMU low level functions
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu/osdep.h"
25
26 /* Needed early for CONFIG_BSD etc. */
27
28 #ifdef CONFIG_SOLARIS
29 #include <sys/statvfs.h>
30 /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
31 discussion about Solaris header problems */
32 extern int madvise(caddr_t, size_t, int);
33 #endif
34
35 #include "qemu-common.h"
36 #include "qemu/cutils.h"
37 #include "qemu/sockets.h"
38 #include "qemu/error-report.h"
39 #include "monitor/monitor.h"
40
41 static bool fips_enabled = false;
42
43 static const char *hw_version = QEMU_HW_VERSION;
44
45 int socket_set_cork(int fd, int v)
46 {
47 #if defined(SOL_TCP) && defined(TCP_CORK)
48 return qemu_setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
49 #else
50 return 0;
51 #endif
52 }
53
54 int socket_set_nodelay(int fd)
55 {
56 int v = 1;
57 return qemu_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v));
58 }
59
60 int qemu_madvise(void *addr, size_t len, int advice)
61 {
62 if (advice == QEMU_MADV_INVALID) {
63 errno = EINVAL;
64 return -1;
65 }
66 #if defined(CONFIG_MADVISE)
67 return madvise(addr, len, advice);
68 #elif defined(CONFIG_POSIX_MADVISE)
69 return posix_madvise(addr, len, advice);
70 #else
71 errno = EINVAL;
72 return -1;
73 #endif
74 }
75
76 #ifndef _WIN32
77 /*
78 * Dups an fd and sets the flags
79 */
80 static int qemu_dup_flags(int fd, int flags)
81 {
82 int ret;
83 int serrno;
84 int dup_flags;
85
86 #ifdef F_DUPFD_CLOEXEC
87 ret = fcntl(fd, F_DUPFD_CLOEXEC, 0);
88 #else
89 ret = dup(fd);
90 if (ret != -1) {
91 qemu_set_cloexec(ret);
92 }
93 #endif
94 if (ret == -1) {
95 goto fail;
96 }
97
98 dup_flags = fcntl(ret, F_GETFL);
99 if (dup_flags == -1) {
100 goto fail;
101 }
102
103 if ((flags & O_SYNC) != (dup_flags & O_SYNC)) {
104 errno = EINVAL;
105 goto fail;
106 }
107
108 /* Set/unset flags that we can with fcntl */
109 if (fcntl(ret, F_SETFL, flags) == -1) {
110 goto fail;
111 }
112
113 /* Truncate the file in the cases that open() would truncate it */
114 if (flags & O_TRUNC ||
115 ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) {
116 if (ftruncate(ret, 0) == -1) {
117 goto fail;
118 }
119 }
120
121 return ret;
122
123 fail:
124 serrno = errno;
125 if (ret != -1) {
126 close(ret);
127 }
128 errno = serrno;
129 return -1;
130 }
131
132 static int qemu_parse_fdset(const char *param)
133 {
134 return qemu_parse_fd(param);
135 }
136 #endif
137
138 /*
139 * Opens a file with FD_CLOEXEC set
140 */
141 int qemu_open(const char *name, int flags, ...)
142 {
143 int ret;
144 int mode = 0;
145
146 #ifndef _WIN32
147 const char *fdset_id_str;
148
149 /* Attempt dup of fd from fd set */
150 if (strstart(name, "/dev/fdset/", &fdset_id_str)) {
151 int64_t fdset_id;
152 int fd, dupfd;
153
154 fdset_id = qemu_parse_fdset(fdset_id_str);
155 if (fdset_id == -1) {
156 errno = EINVAL;
157 return -1;
158 }
159
160 fd = monitor_fdset_get_fd(fdset_id, flags);
161 if (fd == -1) {
162 return -1;
163 }
164
165 dupfd = qemu_dup_flags(fd, flags);
166 if (dupfd == -1) {
167 return -1;
168 }
169
170 ret = monitor_fdset_dup_fd_add(fdset_id, dupfd);
171 if (ret == -1) {
172 close(dupfd);
173 errno = EINVAL;
174 return -1;
175 }
176
177 return dupfd;
178 }
179 #endif
180
181 if (flags & O_CREAT) {
182 va_list ap;
183
184 va_start(ap, flags);
185 mode = va_arg(ap, int);
186 va_end(ap);
187 }
188
189 #ifdef O_CLOEXEC
190 ret = open(name, flags | O_CLOEXEC, mode);
191 #else
192 ret = open(name, flags, mode);
193 if (ret >= 0) {
194 qemu_set_cloexec(ret);
195 }
196 #endif
197
198 #ifdef O_DIRECT
199 if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) {
200 error_report("file system may not support O_DIRECT");
201 errno = EINVAL; /* in case it was clobbered */
202 }
203 #endif /* O_DIRECT */
204
205 return ret;
206 }
207
208 int qemu_close(int fd)
209 {
210 int64_t fdset_id;
211
212 /* Close fd that was dup'd from an fdset */
213 fdset_id = monitor_fdset_dup_fd_find(fd);
214 if (fdset_id != -1) {
215 int ret;
216
217 ret = close(fd);
218 if (ret == 0) {
219 monitor_fdset_dup_fd_remove(fd);
220 }
221
222 return ret;
223 }
224
225 return close(fd);
226 }
227
228 /*
229 * A variant of write(2) which handles partial write.
230 *
231 * Return the number of bytes transferred.
232 * Set errno if fewer than `count' bytes are written.
233 *
234 * This function don't work with non-blocking fd's.
235 * Any of the possibilities with non-bloking fd's is bad:
236 * - return a short write (then name is wrong)
237 * - busy wait adding (errno == EAGAIN) to the loop
238 */
239 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
240 {
241 ssize_t ret = 0;
242 ssize_t total = 0;
243
244 while (count) {
245 ret = write(fd, buf, count);
246 if (ret < 0) {
247 if (errno == EINTR)
248 continue;
249 break;
250 }
251
252 count -= ret;
253 buf += ret;
254 total += ret;
255 }
256
257 return total;
258 }
259
260 /*
261 * Opens a socket with FD_CLOEXEC set
262 */
263 int qemu_socket(int domain, int type, int protocol)
264 {
265 int ret;
266
267 #ifdef SOCK_CLOEXEC
268 ret = socket(domain, type | SOCK_CLOEXEC, protocol);
269 if (ret != -1 || errno != EINVAL) {
270 return ret;
271 }
272 #endif
273 ret = socket(domain, type, protocol);
274 if (ret >= 0) {
275 qemu_set_cloexec(ret);
276 }
277
278 return ret;
279 }
280
281 /*
282 * Accept a connection and set FD_CLOEXEC
283 */
284 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
285 {
286 int ret;
287
288 #ifdef CONFIG_ACCEPT4
289 ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
290 if (ret != -1 || errno != ENOSYS) {
291 return ret;
292 }
293 #endif
294 ret = accept(s, addr, addrlen);
295 if (ret >= 0) {
296 qemu_set_cloexec(ret);
297 }
298
299 return ret;
300 }
301
302 void qemu_set_hw_version(const char *version)
303 {
304 hw_version = version;
305 }
306
307 const char *qemu_hw_version(void)
308 {
309 return hw_version;
310 }
311
312 void fips_set_state(bool requested)
313 {
314 #ifdef __linux__
315 if (requested) {
316 FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r");
317 if (fds != NULL) {
318 fips_enabled = (fgetc(fds) == '1');
319 fclose(fds);
320 }
321 }
322 #else
323 fips_enabled = false;
324 #endif /* __linux__ */
325
326 #ifdef _FIPS_DEBUG
327 fprintf(stderr, "FIPS mode %s (requested %s)\n",
328 (fips_enabled ? "enabled" : "disabled"),
329 (requested ? "enabled" : "disabled"));
330 #endif
331 }
332
333 bool fips_get_state(void)
334 {
335 return fips_enabled;
336 }
337
338 #ifdef _WIN32
339 static void socket_cleanup(void)
340 {
341 WSACleanup();
342 }
343 #endif
344
345 int socket_init(void)
346 {
347 #ifdef _WIN32
348 WSADATA Data;
349 int ret, err;
350
351 ret = WSAStartup(MAKEWORD(2, 2), &Data);
352 if (ret != 0) {
353 err = WSAGetLastError();
354 fprintf(stderr, "WSAStartup: %d\n", err);
355 return -1;
356 }
357 atexit(socket_cleanup);
358 #endif
359 return 0;
360 }
361
362 #if !GLIB_CHECK_VERSION(2, 31, 0)
363 /* Ensure that glib is running in multi-threaded mode
364 * Old versions of glib require explicit initialization. Failure to do
365 * this results in the single-threaded code paths being taken inside
366 * glib. For example, the g_slice allocator will not be thread-safe
367 * and cause crashes.
368 */
369 static void __attribute__((constructor)) thread_init(void)
370 {
371 if (!g_thread_supported()) {
372 g_thread_init(NULL);
373 }
374 }
375 #endif
376
377 #ifndef CONFIG_IOVEC
378 /* helper function for iov_send_recv() */
379 static ssize_t
380 readv_writev(int fd, const struct iovec *iov, int iov_cnt, bool do_write)
381 {
382 unsigned i = 0;
383 ssize_t ret = 0;
384 while (i < iov_cnt) {
385 ssize_t r = do_write
386 ? write(fd, iov[i].iov_base, iov[i].iov_len)
387 : read(fd, iov[i].iov_base, iov[i].iov_len);
388 if (r > 0) {
389 ret += r;
390 } else if (!r) {
391 break;
392 } else if (errno == EINTR) {
393 continue;
394 } else {
395 /* else it is some "other" error,
396 * only return if there was no data processed. */
397 if (ret == 0) {
398 ret = -1;
399 }
400 break;
401 }
402 i++;
403 }
404 return ret;
405 }
406
407 ssize_t
408 readv(int fd, const struct iovec *iov, int iov_cnt)
409 {
410 return readv_writev(fd, iov, iov_cnt, false);
411 }
412
413 ssize_t
414 writev(int fd, const struct iovec *iov, int iov_cnt)
415 {
416 return readv_writev(fd, iov, iov_cnt, true);
417 }
418 #endif