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Commit | Line | Data |
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ea88812f FB |
1 | /* |
2 | * QEMU low level functions | |
5fafdf24 | 3 | * |
ea88812f | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
ea88812f FB |
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 | */ | |
aafd7584 | 24 | #include "qemu/osdep.h" |
ebb3d49c | 25 | #include "qapi/error.h" |
f582af58 PB |
26 | |
27 | /* Needed early for CONFIG_BSD etc. */ | |
f582af58 | 28 | |
dfe5fff3 | 29 | #ifdef CONFIG_SOLARIS |
605686cd | 30 | #include <sys/statvfs.h> |
e78815a5 AF |
31 | /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for |
32 | discussion about Solaris header problems */ | |
d7df0b41 | 33 | extern int madvise(char *, size_t, int); |
605686cd | 34 | #endif |
ea88812f | 35 | |
e64e27d5 | 36 | #include <dirent.h> |
511d2b14 | 37 | #include "qemu-common.h" |
f348b6d1 | 38 | #include "qemu/cutils.h" |
1de7afc9 | 39 | #include "qemu/sockets.h" |
d49b6836 | 40 | #include "qemu/error-report.h" |
83c9089e | 41 | #include "monitor/monitor.h" |
03ff3ca3 | 42 | |
0f66998f PM |
43 | static bool fips_enabled = false; |
44 | ||
d494352c | 45 | static const char *hw_version = QEMU_HW_VERSION; |
93bfef4c | 46 | |
128aa589 PB |
47 | int socket_set_cork(int fd, int v) |
48 | { | |
49 | #if defined(SOL_TCP) && defined(TCP_CORK) | |
4bd1afbd | 50 | return qemu_setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); |
128aa589 PB |
51 | #else |
52 | return 0; | |
53 | #endif | |
54 | } | |
55 | ||
bf1c852a MK |
56 | int socket_set_nodelay(int fd) |
57 | { | |
58 | int v = 1; | |
4bd1afbd | 59 | return qemu_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &v, sizeof(v)); |
bf1c852a MK |
60 | } |
61 | ||
e78815a5 AF |
62 | int qemu_madvise(void *addr, size_t len, int advice) |
63 | { | |
64 | if (advice == QEMU_MADV_INVALID) { | |
65 | errno = EINVAL; | |
66 | return -1; | |
67 | } | |
68 | #if defined(CONFIG_MADVISE) | |
69 | return madvise(addr, len, advice); | |
70 | #elif defined(CONFIG_POSIX_MADVISE) | |
71 | return posix_madvise(addr, len, advice); | |
72 | #else | |
73 | errno = EINVAL; | |
74 | return -1; | |
75 | #endif | |
76 | } | |
77 | ||
5fa64b31 EC |
78 | static int qemu_mprotect__osdep(void *addr, size_t size, int prot) |
79 | { | |
80 | g_assert(!((uintptr_t)addr & ~qemu_real_host_page_mask)); | |
81 | g_assert(!(size & ~qemu_real_host_page_mask)); | |
82 | ||
83 | #ifdef _WIN32 | |
84 | DWORD old_protect; | |
85 | ||
86 | if (!VirtualProtect(addr, size, prot, &old_protect)) { | |
cf0c76cd PMD |
87 | g_autofree gchar *emsg = g_win32_error_message(GetLastError()); |
88 | error_report("%s: VirtualProtect failed: %s", __func__, emsg); | |
5fa64b31 EC |
89 | return -1; |
90 | } | |
91 | return 0; | |
92 | #else | |
93 | if (mprotect(addr, size, prot)) { | |
94 | error_report("%s: mprotect failed: %s", __func__, strerror(errno)); | |
95 | return -1; | |
96 | } | |
97 | return 0; | |
98 | #endif | |
99 | } | |
100 | ||
d7107fc0 RH |
101 | int qemu_mprotect_rw(void *addr, size_t size) |
102 | { | |
103 | #ifdef _WIN32 | |
104 | return qemu_mprotect__osdep(addr, size, PAGE_READWRITE); | |
105 | #else | |
106 | return qemu_mprotect__osdep(addr, size, PROT_READ | PROT_WRITE); | |
107 | #endif | |
108 | } | |
109 | ||
5fa64b31 EC |
110 | int qemu_mprotect_rwx(void *addr, size_t size) |
111 | { | |
112 | #ifdef _WIN32 | |
113 | return qemu_mprotect__osdep(addr, size, PAGE_EXECUTE_READWRITE); | |
114 | #else | |
115 | return qemu_mprotect__osdep(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC); | |
116 | #endif | |
117 | } | |
118 | ||
119 | int qemu_mprotect_none(void *addr, size_t size) | |
120 | { | |
121 | #ifdef _WIN32 | |
122 | return qemu_mprotect__osdep(addr, size, PAGE_NOACCESS); | |
123 | #else | |
124 | return qemu_mprotect__osdep(addr, size, PROT_NONE); | |
125 | #endif | |
126 | } | |
127 | ||
adb696f3 | 128 | #ifndef _WIN32 |
ca749954 FZ |
129 | |
130 | static int fcntl_op_setlk = -1; | |
131 | static int fcntl_op_getlk = -1; | |
132 | ||
adb696f3 CB |
133 | /* |
134 | * Dups an fd and sets the flags | |
135 | */ | |
60efffa4 | 136 | int qemu_dup_flags(int fd, int flags) |
adb696f3 CB |
137 | { |
138 | int ret; | |
139 | int serrno; | |
140 | int dup_flags; | |
adb696f3 | 141 | |
761d1ddf | 142 | ret = qemu_dup(fd); |
adb696f3 CB |
143 | if (ret == -1) { |
144 | goto fail; | |
145 | } | |
146 | ||
147 | dup_flags = fcntl(ret, F_GETFL); | |
148 | if (dup_flags == -1) { | |
149 | goto fail; | |
150 | } | |
151 | ||
152 | if ((flags & O_SYNC) != (dup_flags & O_SYNC)) { | |
153 | errno = EINVAL; | |
154 | goto fail; | |
155 | } | |
156 | ||
157 | /* Set/unset flags that we can with fcntl */ | |
3b6eda2f | 158 | if (fcntl(ret, F_SETFL, flags) == -1) { |
adb696f3 CB |
159 | goto fail; |
160 | } | |
161 | ||
162 | /* Truncate the file in the cases that open() would truncate it */ | |
163 | if (flags & O_TRUNC || | |
164 | ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) { | |
165 | if (ftruncate(ret, 0) == -1) { | |
166 | goto fail; | |
167 | } | |
168 | } | |
169 | ||
170 | return ret; | |
171 | ||
172 | fail: | |
173 | serrno = errno; | |
174 | if (ret != -1) { | |
175 | close(ret); | |
176 | } | |
177 | errno = serrno; | |
178 | return -1; | |
179 | } | |
0100fbbe | 180 | |
761d1ddf FZ |
181 | int qemu_dup(int fd) |
182 | { | |
183 | int ret; | |
184 | #ifdef F_DUPFD_CLOEXEC | |
185 | ret = fcntl(fd, F_DUPFD_CLOEXEC, 0); | |
186 | #else | |
187 | ret = dup(fd); | |
188 | if (ret != -1) { | |
189 | qemu_set_cloexec(ret); | |
190 | } | |
191 | #endif | |
192 | return ret; | |
193 | } | |
194 | ||
0100fbbe PB |
195 | static int qemu_parse_fdset(const char *param) |
196 | { | |
197 | return qemu_parse_fd(param); | |
198 | } | |
13461fdb | 199 | |
ca749954 FZ |
200 | static void qemu_probe_lock_ops(void) |
201 | { | |
202 | if (fcntl_op_setlk == -1) { | |
203 | #ifdef F_OFD_SETLK | |
204 | int fd; | |
205 | int ret; | |
206 | struct flock fl = { | |
207 | .l_whence = SEEK_SET, | |
208 | .l_start = 0, | |
209 | .l_len = 0, | |
210 | .l_type = F_WRLCK, | |
211 | }; | |
212 | ||
213 | fd = open("/dev/null", O_RDWR); | |
214 | if (fd < 0) { | |
215 | fprintf(stderr, | |
216 | "Failed to open /dev/null for OFD lock probing: %s\n", | |
217 | strerror(errno)); | |
218 | fcntl_op_setlk = F_SETLK; | |
219 | fcntl_op_getlk = F_GETLK; | |
220 | return; | |
221 | } | |
222 | ret = fcntl(fd, F_OFD_GETLK, &fl); | |
223 | close(fd); | |
224 | if (!ret) { | |
225 | fcntl_op_setlk = F_OFD_SETLK; | |
226 | fcntl_op_getlk = F_OFD_GETLK; | |
227 | } else { | |
228 | fcntl_op_setlk = F_SETLK; | |
229 | fcntl_op_getlk = F_GETLK; | |
230 | } | |
231 | #else | |
232 | fcntl_op_setlk = F_SETLK; | |
233 | fcntl_op_getlk = F_GETLK; | |
234 | #endif | |
235 | } | |
236 | } | |
237 | ||
238 | bool qemu_has_ofd_lock(void) | |
239 | { | |
240 | qemu_probe_lock_ops(); | |
241 | #ifdef F_OFD_SETLK | |
242 | return fcntl_op_setlk == F_OFD_SETLK; | |
243 | #else | |
244 | return false; | |
245 | #endif | |
246 | } | |
247 | ||
13461fdb FZ |
248 | static int qemu_lock_fcntl(int fd, int64_t start, int64_t len, int fl_type) |
249 | { | |
13461fdb FZ |
250 | int ret; |
251 | struct flock fl = { | |
252 | .l_whence = SEEK_SET, | |
253 | .l_start = start, | |
254 | .l_len = len, | |
255 | .l_type = fl_type, | |
256 | }; | |
ca749954 | 257 | qemu_probe_lock_ops(); |
f86428a1 FZ |
258 | do { |
259 | ret = fcntl(fd, fcntl_op_setlk, &fl); | |
260 | } while (ret == -1 && errno == EINTR); | |
13461fdb | 261 | return ret == -1 ? -errno : 0; |
13461fdb FZ |
262 | } |
263 | ||
264 | int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive) | |
265 | { | |
266 | return qemu_lock_fcntl(fd, start, len, exclusive ? F_WRLCK : F_RDLCK); | |
267 | } | |
268 | ||
269 | int qemu_unlock_fd(int fd, int64_t start, int64_t len) | |
270 | { | |
271 | return qemu_lock_fcntl(fd, start, len, F_UNLCK); | |
272 | } | |
273 | ||
274 | int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive) | |
275 | { | |
13461fdb FZ |
276 | int ret; |
277 | struct flock fl = { | |
278 | .l_whence = SEEK_SET, | |
279 | .l_start = start, | |
280 | .l_len = len, | |
281 | .l_type = exclusive ? F_WRLCK : F_RDLCK, | |
282 | }; | |
ca749954 FZ |
283 | qemu_probe_lock_ops(); |
284 | ret = fcntl(fd, fcntl_op_getlk, &fl); | |
13461fdb FZ |
285 | if (ret == -1) { |
286 | return -errno; | |
287 | } else { | |
288 | return fl.l_type == F_UNLCK ? 0 : -EAGAIN; | |
289 | } | |
13461fdb | 290 | } |
adb696f3 | 291 | #endif |
03ff3ca3 | 292 | |
c2069ff6 DB |
293 | static int qemu_open_cloexec(const char *name, int flags, mode_t mode) |
294 | { | |
295 | int ret; | |
296 | #ifdef O_CLOEXEC | |
297 | ret = open(name, flags | O_CLOEXEC, mode); | |
298 | #else | |
299 | ret = open(name, flags, mode); | |
300 | if (ret >= 0) { | |
301 | qemu_set_cloexec(ret); | |
302 | } | |
303 | #endif | |
304 | return ret; | |
305 | } | |
306 | ||
40ff6d7e KW |
307 | /* |
308 | * Opens a file with FD_CLOEXEC set | |
309 | */ | |
bf93d2ad | 310 | static int |
ebb3d49c | 311 | qemu_open_internal(const char *name, int flags, mode_t mode, Error **errp) |
40ff6d7e KW |
312 | { |
313 | int ret; | |
40ff6d7e | 314 | |
adb696f3 CB |
315 | #ifndef _WIN32 |
316 | const char *fdset_id_str; | |
317 | ||
318 | /* Attempt dup of fd from fd set */ | |
319 | if (strstart(name, "/dev/fdset/", &fdset_id_str)) { | |
320 | int64_t fdset_id; | |
60efffa4 | 321 | int dupfd; |
adb696f3 CB |
322 | |
323 | fdset_id = qemu_parse_fdset(fdset_id_str); | |
324 | if (fdset_id == -1) { | |
ebb3d49c | 325 | error_setg(errp, "Could not parse fdset %s", name); |
adb696f3 CB |
326 | errno = EINVAL; |
327 | return -1; | |
328 | } | |
329 | ||
60efffa4 | 330 | dupfd = monitor_fdset_dup_fd_add(fdset_id, flags); |
adb696f3 | 331 | if (dupfd == -1) { |
ebb3d49c DB |
332 | error_setg_errno(errp, errno, "Could not dup FD for %s flags %x", |
333 | name, flags); | |
adb696f3 CB |
334 | return -1; |
335 | } | |
336 | ||
adb696f3 CB |
337 | return dupfd; |
338 | } | |
339 | #endif | |
340 | ||
bf93d2ad DB |
341 | ret = qemu_open_cloexec(name, flags, mode); |
342 | ||
ebb3d49c DB |
343 | if (ret == -1) { |
344 | const char *action = flags & O_CREAT ? "create" : "open"; | |
661b3e81 DB |
345 | #ifdef O_DIRECT |
346 | /* Give more helpful error message for O_DIRECT */ | |
347 | if (errno == EINVAL && (flags & O_DIRECT)) { | |
348 | ret = open(name, flags & ~O_DIRECT, mode); | |
349 | if (ret != -1) { | |
350 | close(ret); | |
351 | error_setg(errp, "Could not %s '%s': " | |
352 | "filesystem does not support O_DIRECT", | |
353 | action, name); | |
354 | errno = EINVAL; /* restore first open()'s errno */ | |
355 | return -1; | |
356 | } | |
357 | } | |
358 | #endif /* O_DIRECT */ | |
ebb3d49c DB |
359 | error_setg_errno(errp, errno, "Could not %s '%s'", |
360 | action, name); | |
361 | } | |
362 | ||
bf93d2ad DB |
363 | return ret; |
364 | } | |
365 | ||
40ff6d7e | 366 | |
c490af57 DB |
367 | int qemu_open(const char *name, int flags, Error **errp) |
368 | { | |
369 | assert(!(flags & O_CREAT)); | |
370 | ||
371 | return qemu_open_internal(name, flags, 0, errp); | |
372 | } | |
373 | ||
374 | ||
375 | int qemu_create(const char *name, int flags, mode_t mode, Error **errp) | |
376 | { | |
377 | assert(!(flags & O_CREAT)); | |
378 | ||
379 | return qemu_open_internal(name, flags | O_CREAT, mode, errp); | |
380 | } | |
381 | ||
382 | ||
bf93d2ad DB |
383 | int qemu_open_old(const char *name, int flags, ...) |
384 | { | |
385 | va_list ap; | |
386 | mode_t mode = 0; | |
387 | int ret; | |
388 | ||
389 | va_start(ap, flags); | |
390 | if (flags & O_CREAT) { | |
40ff6d7e | 391 | mode = va_arg(ap, int); |
40ff6d7e | 392 | } |
bf93d2ad | 393 | va_end(ap); |
40ff6d7e | 394 | |
ebb3d49c | 395 | ret = qemu_open_internal(name, flags, mode, NULL); |
40ff6d7e | 396 | |
a5813077 SH |
397 | #ifdef O_DIRECT |
398 | if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) { | |
399 | error_report("file system may not support O_DIRECT"); | |
400 | errno = EINVAL; /* in case it was clobbered */ | |
401 | } | |
402 | #endif /* O_DIRECT */ | |
403 | ||
40ff6d7e KW |
404 | return ret; |
405 | } | |
406 | ||
2e1e79da CB |
407 | int qemu_close(int fd) |
408 | { | |
adb696f3 CB |
409 | int64_t fdset_id; |
410 | ||
411 | /* Close fd that was dup'd from an fdset */ | |
412 | fdset_id = monitor_fdset_dup_fd_find(fd); | |
413 | if (fdset_id != -1) { | |
414 | int ret; | |
415 | ||
416 | ret = close(fd); | |
417 | if (ret == 0) { | |
418 | monitor_fdset_dup_fd_remove(fd); | |
419 | } | |
420 | ||
421 | return ret; | |
422 | } | |
423 | ||
2e1e79da CB |
424 | return close(fd); |
425 | } | |
426 | ||
ee13240e MAL |
427 | /* |
428 | * Delete a file from the filesystem, unless the filename is /dev/fdset/... | |
429 | * | |
430 | * Returns: On success, zero is returned. On error, -1 is returned, | |
431 | * and errno is set appropriately. | |
432 | */ | |
433 | int qemu_unlink(const char *name) | |
434 | { | |
435 | if (g_str_has_prefix(name, "/dev/fdset/")) { | |
436 | return 0; | |
437 | } | |
438 | ||
439 | return unlink(name); | |
440 | } | |
441 | ||
7b5f699d KS |
442 | /* |
443 | * A variant of write(2) which handles partial write. | |
444 | * | |
445 | * Return the number of bytes transferred. | |
446 | * Set errno if fewer than `count' bytes are written. | |
1298cb68 JQ |
447 | * |
448 | * This function don't work with non-blocking fd's. | |
8cc360b9 | 449 | * Any of the possibilities with non-blocking fd's is bad: |
1298cb68 JQ |
450 | * - return a short write (then name is wrong) |
451 | * - busy wait adding (errno == EAGAIN) to the loop | |
7b5f699d KS |
452 | */ |
453 | ssize_t qemu_write_full(int fd, const void *buf, size_t count) | |
454 | { | |
455 | ssize_t ret = 0; | |
456 | ssize_t total = 0; | |
457 | ||
458 | while (count) { | |
459 | ret = write(fd, buf, count); | |
460 | if (ret < 0) { | |
461 | if (errno == EINTR) | |
462 | continue; | |
463 | break; | |
464 | } | |
465 | ||
466 | count -= ret; | |
467 | buf += ret; | |
468 | total += ret; | |
469 | } | |
470 | ||
471 | return total; | |
472 | } | |
473 | ||
40ff6d7e KW |
474 | /* |
475 | * Opens a socket with FD_CLOEXEC set | |
476 | */ | |
477 | int qemu_socket(int domain, int type, int protocol) | |
478 | { | |
479 | int ret; | |
480 | ||
481 | #ifdef SOCK_CLOEXEC | |
482 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); | |
3a03bfa5 AP |
483 | if (ret != -1 || errno != EINVAL) { |
484 | return ret; | |
485 | } | |
486 | #endif | |
40ff6d7e KW |
487 | ret = socket(domain, type, protocol); |
488 | if (ret >= 0) { | |
489 | qemu_set_cloexec(ret); | |
490 | } | |
40ff6d7e KW |
491 | |
492 | return ret; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Accept a connection and set FD_CLOEXEC | |
497 | */ | |
498 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) | |
499 | { | |
500 | int ret; | |
501 | ||
502 | #ifdef CONFIG_ACCEPT4 | |
503 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); | |
347ed55c | 504 | if (ret != -1 || errno != ENOSYS) { |
3a03bfa5 AP |
505 | return ret; |
506 | } | |
507 | #endif | |
40ff6d7e KW |
508 | ret = accept(s, addr, addrlen); |
509 | if (ret >= 0) { | |
510 | qemu_set_cloexec(ret); | |
511 | } | |
40ff6d7e KW |
512 | |
513 | return ret; | |
514 | } | |
993295fe | 515 | |
35c2c8dc | 516 | void qemu_set_hw_version(const char *version) |
93bfef4c | 517 | { |
35c2c8dc | 518 | hw_version = version; |
93bfef4c CV |
519 | } |
520 | ||
35c2c8dc | 521 | const char *qemu_hw_version(void) |
93bfef4c | 522 | { |
35c2c8dc | 523 | return hw_version; |
93bfef4c | 524 | } |
0f66998f PM |
525 | |
526 | void fips_set_state(bool requested) | |
527 | { | |
528 | #ifdef __linux__ | |
529 | if (requested) { | |
530 | FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r"); | |
531 | if (fds != NULL) { | |
532 | fips_enabled = (fgetc(fds) == '1'); | |
533 | fclose(fds); | |
534 | } | |
535 | } | |
536 | #else | |
537 | fips_enabled = false; | |
538 | #endif /* __linux__ */ | |
539 | ||
540 | #ifdef _FIPS_DEBUG | |
541 | fprintf(stderr, "FIPS mode %s (requested %s)\n", | |
7d37435b PB |
542 | (fips_enabled ? "enabled" : "disabled"), |
543 | (requested ? "enabled" : "disabled")); | |
0f66998f PM |
544 | #endif |
545 | } | |
546 | ||
547 | bool fips_get_state(void) | |
548 | { | |
549 | return fips_enabled; | |
550 | } | |
0100fbbe | 551 | |
d3bf825e MAL |
552 | #ifdef _WIN32 |
553 | static void socket_cleanup(void) | |
554 | { | |
555 | WSACleanup(); | |
556 | } | |
557 | #endif | |
558 | ||
559 | int socket_init(void) | |
560 | { | |
561 | #ifdef _WIN32 | |
562 | WSADATA Data; | |
563 | int ret, err; | |
564 | ||
565 | ret = WSAStartup(MAKEWORD(2, 2), &Data); | |
566 | if (ret != 0) { | |
567 | err = WSAGetLastError(); | |
568 | fprintf(stderr, "WSAStartup: %d\n", err); | |
569 | return -1; | |
570 | } | |
571 | atexit(socket_cleanup); | |
572 | #endif | |
573 | return 0; | |
574 | } | |
9adea5f7 | 575 | |
ae2990c2 | 576 | |
9adea5f7 PB |
577 | #ifndef CONFIG_IOVEC |
578 | /* helper function for iov_send_recv() */ | |
579 | static ssize_t | |
580 | readv_writev(int fd, const struct iovec *iov, int iov_cnt, bool do_write) | |
581 | { | |
582 | unsigned i = 0; | |
583 | ssize_t ret = 0; | |
584 | while (i < iov_cnt) { | |
585 | ssize_t r = do_write | |
586 | ? write(fd, iov[i].iov_base, iov[i].iov_len) | |
587 | : read(fd, iov[i].iov_base, iov[i].iov_len); | |
588 | if (r > 0) { | |
589 | ret += r; | |
590 | } else if (!r) { | |
591 | break; | |
592 | } else if (errno == EINTR) { | |
593 | continue; | |
594 | } else { | |
595 | /* else it is some "other" error, | |
596 | * only return if there was no data processed. */ | |
597 | if (ret == 0) { | |
598 | ret = -1; | |
599 | } | |
600 | break; | |
601 | } | |
602 | i++; | |
603 | } | |
604 | return ret; | |
605 | } | |
606 | ||
607 | ssize_t | |
608 | readv(int fd, const struct iovec *iov, int iov_cnt) | |
609 | { | |
610 | return readv_writev(fd, iov, iov_cnt, false); | |
611 | } | |
612 | ||
613 | ssize_t | |
614 | writev(int fd, const struct iovec *iov, int iov_cnt) | |
615 | { | |
616 | return readv_writev(fd, iov, iov_cnt, true); | |
617 | } | |
618 | #endif | |
e64e27d5 VC |
619 | |
620 | struct dirent * | |
621 | qemu_dirent_dup(struct dirent *dent) | |
622 | { | |
623 | size_t sz = 0; | |
624 | #if defined _DIRENT_HAVE_D_RECLEN | |
625 | /* Avoid use of strlen() if platform supports d_reclen. */ | |
626 | sz = dent->d_reclen; | |
627 | #endif | |
628 | /* | |
629 | * Test sz for zero even if d_reclen is available | |
630 | * because some drivers may set d_reclen to zero. | |
631 | */ | |
632 | if (sz == 0) { | |
633 | /* Fallback to the most portable way. */ | |
634 | sz = offsetof(struct dirent, d_name) + | |
635 | strlen(dent->d_name) + 1; | |
636 | } | |
637 | return g_memdup(dent, sz); | |
638 | } |