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Commit | Line | Data |
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c1b0b93b JS |
1 | /* |
2 | * os-posix-lib.c | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2010 Red Hat, Inc. | |
6 | * | |
7 | * QEMU library functions on POSIX which are shared between QEMU and | |
8 | * the QEMU tools. | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
26 | * THE SOFTWARE. | |
27 | */ | |
28 | ||
2e07b297 | 29 | #if defined(__linux__) && (defined(__x86_64__) || defined(__arm__)) |
c2a8238a SW |
30 | /* Use 2 MiB alignment so transparent hugepages can be used by KVM. |
31 | Valgrind does not support alignments larger than 1 MiB, | |
32 | therefore we need special code which handles running on Valgrind. */ | |
36b58628 | 33 | # define QEMU_VMALLOC_ALIGN (512 * 4096) |
fdec9918 CB |
34 | #elif defined(__linux__) && defined(__s390x__) |
35 | /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */ | |
36 | # define QEMU_VMALLOC_ALIGN (256 * 4096) | |
36b58628 AK |
37 | #else |
38 | # define QEMU_VMALLOC_ALIGN getpagesize() | |
39 | #endif | |
40 | ||
aafd7584 | 41 | #include "qemu/osdep.h" |
13401ba0 | 42 | #include <termios.h> |
d57e4e48 | 43 | #include <termios.h> |
13401ba0 | 44 | |
e2ea3515 LE |
45 | #include <glib/gprintf.h> |
46 | ||
9c17d615 | 47 | #include "sysemu/sysemu.h" |
c1b0b93b | 48 | #include "trace.h" |
1de7afc9 | 49 | #include "qemu/sockets.h" |
7dda5dc8 | 50 | #include <sys/mman.h> |
10f5bff6 | 51 | #include <libgen.h> |
38183310 PB |
52 | #include <setjmp.h> |
53 | #include <sys/signal.h> | |
c1b0b93b | 54 | |
cbcfa041 PB |
55 | #ifdef CONFIG_LINUX |
56 | #include <sys/syscall.h> | |
57 | #endif | |
cbcfa041 | 58 | |
41975b26 AF |
59 | #ifdef __FreeBSD__ |
60 | #include <sys/sysctl.h> | |
61 | #endif | |
62 | ||
794e8f30 MT |
63 | #include <qemu/mmap-alloc.h> |
64 | ||
cbcfa041 PB |
65 | int qemu_get_thread_id(void) |
66 | { | |
67 | #if defined(__linux__) | |
68 | return syscall(SYS_gettid); | |
69 | #else | |
70 | return getpid(); | |
71 | #endif | |
72 | } | |
f97742d0 AR |
73 | |
74 | int qemu_daemon(int nochdir, int noclose) | |
75 | { | |
76 | return daemon(nochdir, noclose); | |
77 | } | |
78 | ||
b152aa84 | 79 | void *qemu_oom_check(void *ptr) |
c1b0b93b JS |
80 | { |
81 | if (ptr == NULL) { | |
82 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); | |
83 | abort(); | |
84 | } | |
85 | return ptr; | |
86 | } | |
c1b0b93b | 87 | |
7d2a35cc | 88 | void *qemu_try_memalign(size_t alignment, size_t size) |
c1b0b93b JS |
89 | { |
90 | void *ptr; | |
e5354657 KW |
91 | |
92 | if (alignment < sizeof(void*)) { | |
93 | alignment = sizeof(void*); | |
94 | } | |
95 | ||
c1b0b93b JS |
96 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) |
97 | int ret; | |
98 | ret = posix_memalign(&ptr, alignment, size); | |
99 | if (ret != 0) { | |
7d2a35cc KW |
100 | errno = ret; |
101 | ptr = NULL; | |
c1b0b93b JS |
102 | } |
103 | #elif defined(CONFIG_BSD) | |
7d2a35cc | 104 | ptr = valloc(size); |
c1b0b93b | 105 | #else |
7d2a35cc | 106 | ptr = memalign(alignment, size); |
c1b0b93b JS |
107 | #endif |
108 | trace_qemu_memalign(alignment, size, ptr); | |
109 | return ptr; | |
110 | } | |
111 | ||
7d2a35cc KW |
112 | void *qemu_memalign(size_t alignment, size_t size) |
113 | { | |
114 | return qemu_oom_check(qemu_try_memalign(alignment, size)); | |
115 | } | |
116 | ||
c1b0b93b | 117 | /* alloc shared memory pages */ |
a2b257d6 | 118 | void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment) |
c1b0b93b | 119 | { |
36b58628 | 120 | size_t align = QEMU_VMALLOC_ALIGN; |
794e8f30 | 121 | void *ptr = qemu_ram_mmap(-1, size, align, false); |
36b58628 | 122 | |
7dda5dc8 | 123 | if (ptr == MAP_FAILED) { |
39228250 | 124 | return NULL; |
c2a8238a | 125 | } |
c2a8238a | 126 | |
a2b257d6 IM |
127 | if (alignment) { |
128 | *alignment = align; | |
129 | } | |
c2dfc5ba | 130 | |
6eebf958 | 131 | trace_qemu_anon_ram_alloc(size, ptr); |
c7f4111a | 132 | return ptr; |
c1b0b93b JS |
133 | } |
134 | ||
135 | void qemu_vfree(void *ptr) | |
136 | { | |
137 | trace_qemu_vfree(ptr); | |
138 | free(ptr); | |
139 | } | |
9549e764 | 140 | |
e7a09b92 PB |
141 | void qemu_anon_ram_free(void *ptr, size_t size) |
142 | { | |
143 | trace_qemu_anon_ram_free(ptr, size); | |
794e8f30 | 144 | qemu_ram_munmap(ptr, size); |
e7a09b92 PB |
145 | } |
146 | ||
f9e8cacc | 147 | void qemu_set_block(int fd) |
154b9a0c PB |
148 | { |
149 | int f; | |
150 | f = fcntl(fd, F_GETFL); | |
151 | fcntl(fd, F_SETFL, f & ~O_NONBLOCK); | |
152 | } | |
153 | ||
f9e8cacc | 154 | void qemu_set_nonblock(int fd) |
9549e764 JS |
155 | { |
156 | int f; | |
157 | f = fcntl(fd, F_GETFL); | |
158 | fcntl(fd, F_SETFL, f | O_NONBLOCK); | |
159 | } | |
160 | ||
606600a1 SO |
161 | int socket_set_fast_reuse(int fd) |
162 | { | |
163 | int val = 1, ret; | |
164 | ||
165 | ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, | |
166 | (const char *)&val, sizeof(val)); | |
167 | ||
168 | assert(ret == 0); | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
9549e764 JS |
173 | void qemu_set_cloexec(int fd) |
174 | { | |
175 | int f; | |
176 | f = fcntl(fd, F_GETFD); | |
177 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); | |
178 | } | |
70e72ce4 JS |
179 | |
180 | /* | |
181 | * Creates a pipe with FD_CLOEXEC set on both file descriptors | |
182 | */ | |
183 | int qemu_pipe(int pipefd[2]) | |
184 | { | |
185 | int ret; | |
186 | ||
187 | #ifdef CONFIG_PIPE2 | |
188 | ret = pipe2(pipefd, O_CLOEXEC); | |
189 | if (ret != -1 || errno != ENOSYS) { | |
190 | return ret; | |
191 | } | |
192 | #endif | |
193 | ret = pipe(pipefd); | |
194 | if (ret == 0) { | |
195 | qemu_set_cloexec(pipefd[0]); | |
196 | qemu_set_cloexec(pipefd[1]); | |
197 | } | |
198 | ||
199 | return ret; | |
200 | } | |
38671423 | 201 | |
ae0f940e | 202 | int qemu_utimens(const char *path, const struct timespec *times) |
38671423 HS |
203 | { |
204 | struct timeval tv[2], tv_now; | |
205 | struct stat st; | |
206 | int i; | |
207 | #ifdef CONFIG_UTIMENSAT | |
208 | int ret; | |
209 | ||
ae0f940e | 210 | ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW); |
38671423 HS |
211 | if (ret != -1 || errno != ENOSYS) { |
212 | return ret; | |
213 | } | |
214 | #endif | |
215 | /* Fallback: use utimes() instead of utimensat() */ | |
216 | ||
217 | /* happy if special cases */ | |
218 | if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) { | |
219 | return 0; | |
220 | } | |
221 | if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) { | |
222 | return utimes(path, NULL); | |
223 | } | |
224 | ||
225 | /* prepare for hard cases */ | |
226 | if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) { | |
227 | gettimeofday(&tv_now, NULL); | |
228 | } | |
229 | if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) { | |
230 | stat(path, &st); | |
231 | } | |
232 | ||
233 | for (i = 0; i < 2; i++) { | |
234 | if (times[i].tv_nsec == UTIME_NOW) { | |
235 | tv[i].tv_sec = tv_now.tv_sec; | |
236 | tv[i].tv_usec = tv_now.tv_usec; | |
237 | } else if (times[i].tv_nsec == UTIME_OMIT) { | |
238 | tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime; | |
239 | tv[i].tv_usec = 0; | |
240 | } else { | |
241 | tv[i].tv_sec = times[i].tv_sec; | |
242 | tv[i].tv_usec = times[i].tv_nsec / 1000; | |
243 | } | |
244 | } | |
245 | ||
246 | return utimes(path, &tv[0]); | |
247 | } | |
e2ea3515 LE |
248 | |
249 | char * | |
250 | qemu_get_local_state_pathname(const char *relative_pathname) | |
251 | { | |
252 | return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR, | |
253 | relative_pathname); | |
254 | } | |
13401ba0 SH |
255 | |
256 | void qemu_set_tty_echo(int fd, bool echo) | |
257 | { | |
258 | struct termios tty; | |
259 | ||
260 | tcgetattr(fd, &tty); | |
261 | ||
262 | if (echo) { | |
263 | tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN; | |
264 | } else { | |
265 | tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); | |
266 | } | |
267 | ||
268 | tcsetattr(fd, TCSANOW, &tty); | |
269 | } | |
10f5bff6 FZ |
270 | |
271 | static char exec_dir[PATH_MAX]; | |
272 | ||
273 | void qemu_init_exec_dir(const char *argv0) | |
274 | { | |
275 | char *dir; | |
276 | char *p = NULL; | |
277 | char buf[PATH_MAX]; | |
278 | ||
279 | assert(!exec_dir[0]); | |
280 | ||
281 | #if defined(__linux__) | |
282 | { | |
283 | int len; | |
284 | len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); | |
285 | if (len > 0) { | |
286 | buf[len] = 0; | |
287 | p = buf; | |
288 | } | |
289 | } | |
290 | #elif defined(__FreeBSD__) | |
291 | { | |
292 | static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; | |
293 | size_t len = sizeof(buf) - 1; | |
294 | ||
295 | *buf = '\0'; | |
296 | if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) && | |
297 | *buf) { | |
298 | buf[sizeof(buf) - 1] = '\0'; | |
299 | p = buf; | |
300 | } | |
301 | } | |
302 | #endif | |
303 | /* If we don't have any way of figuring out the actual executable | |
304 | location then try argv[0]. */ | |
305 | if (!p) { | |
306 | if (!argv0) { | |
307 | return; | |
308 | } | |
309 | p = realpath(argv0, buf); | |
310 | if (!p) { | |
311 | return; | |
312 | } | |
313 | } | |
314 | dir = dirname(p); | |
315 | ||
316 | pstrcpy(exec_dir, sizeof(exec_dir), dir); | |
317 | } | |
318 | ||
319 | char *qemu_get_exec_dir(void) | |
320 | { | |
321 | return g_strdup(exec_dir); | |
322 | } | |
38183310 PB |
323 | |
324 | static sigjmp_buf sigjump; | |
325 | ||
326 | static void sigbus_handler(int signal) | |
327 | { | |
328 | siglongjmp(sigjump, 1); | |
329 | } | |
330 | ||
38183310 PB |
331 | void os_mem_prealloc(int fd, char *area, size_t memory) |
332 | { | |
b7bf8f56 | 333 | int ret; |
38183310 PB |
334 | struct sigaction act, oldact; |
335 | sigset_t set, oldset; | |
38183310 PB |
336 | |
337 | memset(&act, 0, sizeof(act)); | |
338 | act.sa_handler = &sigbus_handler; | |
339 | act.sa_flags = 0; | |
340 | ||
341 | ret = sigaction(SIGBUS, &act, &oldact); | |
342 | if (ret) { | |
343 | perror("os_mem_prealloc: failed to install signal handler"); | |
344 | exit(1); | |
345 | } | |
346 | ||
347 | /* unblock SIGBUS */ | |
348 | sigemptyset(&set); | |
349 | sigaddset(&set, SIGBUS); | |
350 | pthread_sigmask(SIG_UNBLOCK, &set, &oldset); | |
351 | ||
352 | if (sigsetjmp(sigjump, 1)) { | |
404ac83e MP |
353 | fprintf(stderr, "os_mem_prealloc: Insufficient free host memory " |
354 | "pages available to allocate guest RAM\n"); | |
38183310 | 355 | exit(1); |
b7bf8f56 SW |
356 | } else { |
357 | int i; | |
7197fb40 | 358 | size_t hpagesize = qemu_fd_getpagesize(fd); |
2a0457bb | 359 | size_t numpages = DIV_ROUND_UP(memory, hpagesize); |
38183310 | 360 | |
b7bf8f56 | 361 | /* MAP_POPULATE silently ignores failures */ |
2a0457bb | 362 | for (i = 0; i < numpages; i++) { |
b7bf8f56 SW |
363 | memset(area + (hpagesize * i), 0, 1); |
364 | } | |
38183310 | 365 | |
b7bf8f56 SW |
366 | ret = sigaction(SIGBUS, &oldact, NULL); |
367 | if (ret) { | |
368 | perror("os_mem_prealloc: failed to reinstall signal handler"); | |
369 | exit(1); | |
370 | } | |
38183310 | 371 | |
b7bf8f56 SW |
372 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
373 | } | |
38183310 | 374 | } |
d57e4e48 DB |
375 | |
376 | ||
377 | static struct termios oldtty; | |
378 | ||
379 | static void term_exit(void) | |
380 | { | |
381 | tcsetattr(0, TCSANOW, &oldtty); | |
382 | } | |
383 | ||
384 | static void term_init(void) | |
385 | { | |
386 | struct termios tty; | |
387 | ||
388 | tcgetattr(0, &tty); | |
389 | oldtty = tty; | |
390 | ||
391 | tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP | |
392 | |INLCR|IGNCR|ICRNL|IXON); | |
393 | tty.c_oflag |= OPOST; | |
394 | tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); | |
395 | tty.c_cflag &= ~(CSIZE|PARENB); | |
396 | tty.c_cflag |= CS8; | |
397 | tty.c_cc[VMIN] = 1; | |
398 | tty.c_cc[VTIME] = 0; | |
399 | ||
400 | tcsetattr(0, TCSANOW, &tty); | |
401 | ||
402 | atexit(term_exit); | |
403 | } | |
404 | ||
405 | int qemu_read_password(char *buf, int buf_size) | |
406 | { | |
407 | uint8_t ch; | |
408 | int i, ret; | |
409 | ||
410 | printf("password: "); | |
411 | fflush(stdout); | |
412 | term_init(); | |
413 | i = 0; | |
414 | for (;;) { | |
415 | ret = read(0, &ch, 1); | |
416 | if (ret == -1) { | |
417 | if (errno == EAGAIN || errno == EINTR) { | |
418 | continue; | |
419 | } else { | |
420 | break; | |
421 | } | |
422 | } else if (ret == 0) { | |
423 | ret = -1; | |
424 | break; | |
425 | } else { | |
6a11d518 DB |
426 | if (ch == '\r' || |
427 | ch == '\n') { | |
d57e4e48 DB |
428 | ret = 0; |
429 | break; | |
430 | } | |
431 | if (i < (buf_size - 1)) { | |
432 | buf[i++] = ch; | |
433 | } | |
434 | } | |
435 | } | |
436 | term_exit(); | |
437 | buf[i] = '\0'; | |
438 | printf("\n"); | |
439 | return ret; | |
440 | } | |
57cb38b3 DB |
441 | |
442 | ||
443 | pid_t qemu_fork(Error **errp) | |
444 | { | |
445 | sigset_t oldmask, newmask; | |
446 | struct sigaction sig_action; | |
447 | int saved_errno; | |
448 | pid_t pid; | |
449 | ||
450 | /* | |
451 | * Need to block signals now, so that child process can safely | |
452 | * kill off caller's signal handlers without a race. | |
453 | */ | |
454 | sigfillset(&newmask); | |
455 | if (pthread_sigmask(SIG_SETMASK, &newmask, &oldmask) != 0) { | |
456 | error_setg_errno(errp, errno, | |
457 | "cannot block signals"); | |
458 | return -1; | |
459 | } | |
460 | ||
461 | pid = fork(); | |
462 | saved_errno = errno; | |
463 | ||
464 | if (pid < 0) { | |
465 | /* attempt to restore signal mask, but ignore failure, to | |
466 | * avoid obscuring the fork failure */ | |
467 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); | |
468 | error_setg_errno(errp, saved_errno, | |
469 | "cannot fork child process"); | |
470 | errno = saved_errno; | |
471 | return -1; | |
472 | } else if (pid) { | |
473 | /* parent process */ | |
474 | ||
475 | /* Restore our original signal mask now that the child is | |
476 | * safely running. Only documented failures are EFAULT (not | |
477 | * possible, since we are using just-grabbed mask) or EINVAL | |
478 | * (not possible, since we are using correct arguments). */ | |
479 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); | |
480 | } else { | |
481 | /* child process */ | |
482 | size_t i; | |
483 | ||
484 | /* Clear out all signal handlers from parent so nothing | |
485 | * unexpected can happen in our child once we unblock | |
486 | * signals */ | |
487 | sig_action.sa_handler = SIG_DFL; | |
488 | sig_action.sa_flags = 0; | |
489 | sigemptyset(&sig_action.sa_mask); | |
490 | ||
491 | for (i = 1; i < NSIG; i++) { | |
492 | /* Only possible errors are EFAULT or EINVAL The former | |
493 | * won't happen, the latter we expect, so no need to check | |
494 | * return value */ | |
495 | (void)sigaction(i, &sig_action, NULL); | |
496 | } | |
497 | ||
498 | /* Unmask all signals in child, since we've no idea what the | |
499 | * caller's done with their signal mask and don't want to | |
500 | * propagate that to children */ | |
501 | sigemptyset(&newmask); | |
502 | if (pthread_sigmask(SIG_SETMASK, &newmask, NULL) != 0) { | |
503 | Error *local_err = NULL; | |
504 | error_setg_errno(&local_err, errno, | |
505 | "cannot unblock signals"); | |
506 | error_report_err(local_err); | |
507 | _exit(1); | |
508 | } | |
509 | } | |
510 | return pid; | |
511 | } |