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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 <stdlib.h> | |
25 | #include <stdio.h> | |
26 | #include <stdarg.h> | |
27 | #include <string.h> | |
28 | #include <errno.h> | |
29 | #include <unistd.h> | |
30 | #include <fcntl.h> | |
31 | ||
32 | /* Needed early for CONFIG_BSD etc. */ | |
33 | #include "config-host.h" | |
34 | ||
35 | #ifdef CONFIG_SOLARIS | |
36 | #include <sys/types.h> | |
37 | #include <sys/statvfs.h> | |
38 | #endif | |
39 | ||
40 | #ifdef CONFIG_EVENTFD | |
41 | #include <sys/eventfd.h> | |
42 | #endif | |
43 | ||
44 | #ifdef _WIN32 | |
45 | #include <windows.h> | |
46 | #elif defined(CONFIG_BSD) | |
47 | #include <stdlib.h> | |
48 | #else | |
49 | #include <malloc.h> | |
50 | #endif | |
51 | ||
52 | #include "qemu-common.h" | |
53 | #include "sysemu.h" | |
54 | #include "qemu_socket.h" | |
55 | ||
56 | #if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__) | |
57 | static void *oom_check(void *ptr) | |
58 | { | |
59 | if (ptr == NULL) { | |
60 | #if defined(_WIN32) | |
61 | fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError()); | |
62 | #else | |
63 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); | |
64 | #endif | |
65 | abort(); | |
66 | } | |
67 | return ptr; | |
68 | } | |
69 | #endif | |
70 | ||
71 | #if defined(_WIN32) | |
72 | void *qemu_memalign(size_t alignment, size_t size) | |
73 | { | |
74 | if (!size) { | |
75 | abort(); | |
76 | } | |
77 | return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE)); | |
78 | } | |
79 | ||
80 | void *qemu_vmalloc(size_t size) | |
81 | { | |
82 | /* FIXME: this is not exactly optimal solution since VirtualAlloc | |
83 | has 64Kb granularity, but at least it guarantees us that the | |
84 | memory is page aligned. */ | |
85 | if (!size) { | |
86 | abort(); | |
87 | } | |
88 | return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE)); | |
89 | } | |
90 | ||
91 | void qemu_vfree(void *ptr) | |
92 | { | |
93 | VirtualFree(ptr, 0, MEM_RELEASE); | |
94 | } | |
95 | ||
96 | #else | |
97 | ||
98 | void *qemu_memalign(size_t alignment, size_t size) | |
99 | { | |
100 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) | |
101 | int ret; | |
102 | void *ptr; | |
103 | ret = posix_memalign(&ptr, alignment, size); | |
104 | if (ret != 0) { | |
105 | fprintf(stderr, "Failed to allocate %zu B: %s\n", | |
106 | size, strerror(ret)); | |
107 | abort(); | |
108 | } | |
109 | return ptr; | |
110 | #elif defined(CONFIG_BSD) | |
111 | return oom_check(valloc(size)); | |
112 | #else | |
113 | return oom_check(memalign(alignment, size)); | |
114 | #endif | |
115 | } | |
116 | ||
117 | /* alloc shared memory pages */ | |
118 | void *qemu_vmalloc(size_t size) | |
119 | { | |
120 | return qemu_memalign(getpagesize(), size); | |
121 | } | |
122 | ||
123 | void qemu_vfree(void *ptr) | |
124 | { | |
125 | free(ptr); | |
126 | } | |
127 | ||
128 | #endif | |
129 | ||
130 | int qemu_create_pidfile(const char *filename) | |
131 | { | |
132 | char buffer[128]; | |
133 | int len; | |
134 | #ifndef _WIN32 | |
135 | int fd; | |
136 | ||
137 | fd = qemu_open(filename, O_RDWR | O_CREAT, 0600); | |
138 | if (fd == -1) | |
139 | return -1; | |
140 | ||
141 | if (lockf(fd, F_TLOCK, 0) == -1) | |
142 | return -1; | |
143 | ||
144 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
145 | if (write(fd, buffer, len) != len) | |
146 | return -1; | |
147 | #else | |
148 | HANDLE file; | |
149 | OVERLAPPED overlap; | |
150 | BOOL ret; | |
151 | memset(&overlap, 0, sizeof(overlap)); | |
152 | ||
153 | file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL, | |
154 | OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); | |
155 | ||
156 | if (file == INVALID_HANDLE_VALUE) | |
157 | return -1; | |
158 | ||
159 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
160 | ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len, | |
161 | &overlap, NULL); | |
162 | if (ret == 0) | |
163 | return -1; | |
164 | #endif | |
165 | return 0; | |
166 | } | |
167 | ||
168 | #ifdef _WIN32 | |
169 | ||
170 | /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */ | |
171 | #define _W32_FT_OFFSET (116444736000000000ULL) | |
172 | ||
173 | int qemu_gettimeofday(qemu_timeval *tp) | |
174 | { | |
175 | union { | |
176 | unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */ | |
177 | FILETIME ft; | |
178 | } _now; | |
179 | ||
180 | if(tp) | |
181 | { | |
182 | GetSystemTimeAsFileTime (&_now.ft); | |
183 | tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL ); | |
184 | tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL); | |
185 | } | |
186 | /* Always return 0 as per Open Group Base Specifications Issue 6. | |
187 | Do not set errno on error. */ | |
188 | return 0; | |
189 | } | |
190 | #endif /* _WIN32 */ | |
191 | ||
192 | ||
193 | #ifdef _WIN32 | |
194 | void socket_set_nonblock(int fd) | |
195 | { | |
196 | unsigned long opt = 1; | |
197 | ioctlsocket(fd, FIONBIO, &opt); | |
198 | } | |
199 | ||
200 | int inet_aton(const char *cp, struct in_addr *ia) | |
201 | { | |
202 | uint32_t addr = inet_addr(cp); | |
203 | if (addr == 0xffffffff) | |
204 | return 0; | |
205 | ia->s_addr = addr; | |
206 | return 1; | |
207 | } | |
208 | ||
209 | void qemu_set_cloexec(int fd) | |
210 | { | |
211 | } | |
212 | ||
213 | #else | |
214 | ||
215 | void socket_set_nonblock(int fd) | |
216 | { | |
217 | int f; | |
218 | f = fcntl(fd, F_GETFL); | |
219 | fcntl(fd, F_SETFL, f | O_NONBLOCK); | |
220 | } | |
221 | ||
222 | void qemu_set_cloexec(int fd) | |
223 | { | |
224 | int f; | |
225 | f = fcntl(fd, F_GETFD); | |
226 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); | |
227 | } | |
228 | ||
229 | #endif | |
230 | ||
231 | /* | |
232 | * Opens a file with FD_CLOEXEC set | |
233 | */ | |
234 | int qemu_open(const char *name, int flags, ...) | |
235 | { | |
236 | int ret; | |
237 | int mode = 0; | |
238 | ||
239 | if (flags & O_CREAT) { | |
240 | va_list ap; | |
241 | ||
242 | va_start(ap, flags); | |
243 | mode = va_arg(ap, int); | |
244 | va_end(ap); | |
245 | } | |
246 | ||
247 | #ifdef O_CLOEXEC | |
248 | ret = open(name, flags | O_CLOEXEC, mode); | |
249 | #else | |
250 | ret = open(name, flags, mode); | |
251 | if (ret >= 0) { | |
252 | qemu_set_cloexec(ret); | |
253 | } | |
254 | #endif | |
255 | ||
256 | return ret; | |
257 | } | |
258 | ||
259 | /* | |
260 | * A variant of write(2) which handles partial write. | |
261 | * | |
262 | * Return the number of bytes transferred. | |
263 | * Set errno if fewer than `count' bytes are written. | |
264 | * | |
265 | * This function don't work with non-blocking fd's. | |
266 | * Any of the possibilities with non-bloking fd's is bad: | |
267 | * - return a short write (then name is wrong) | |
268 | * - busy wait adding (errno == EAGAIN) to the loop | |
269 | */ | |
270 | ssize_t qemu_write_full(int fd, const void *buf, size_t count) | |
271 | { | |
272 | ssize_t ret = 0; | |
273 | ssize_t total = 0; | |
274 | ||
275 | while (count) { | |
276 | ret = write(fd, buf, count); | |
277 | if (ret < 0) { | |
278 | if (errno == EINTR) | |
279 | continue; | |
280 | break; | |
281 | } | |
282 | ||
283 | count -= ret; | |
284 | buf += ret; | |
285 | total += ret; | |
286 | } | |
287 | ||
288 | return total; | |
289 | } | |
290 | ||
291 | #ifndef _WIN32 | |
292 | /* | |
293 | * Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set. | |
294 | */ | |
295 | int qemu_eventfd(int fds[2]) | |
296 | { | |
297 | #ifdef CONFIG_EVENTFD | |
298 | int ret; | |
299 | ||
300 | ret = eventfd(0, 0); | |
301 | if (ret >= 0) { | |
302 | fds[0] = ret; | |
303 | qemu_set_cloexec(ret); | |
304 | if ((fds[1] = dup(ret)) == -1) { | |
305 | close(ret); | |
306 | return -1; | |
307 | } | |
308 | qemu_set_cloexec(fds[1]); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | if (errno != ENOSYS) { | |
313 | return -1; | |
314 | } | |
315 | #endif | |
316 | ||
317 | return qemu_pipe(fds); | |
318 | } | |
319 | ||
320 | /* | |
321 | * Creates a pipe with FD_CLOEXEC set on both file descriptors | |
322 | */ | |
323 | int qemu_pipe(int pipefd[2]) | |
324 | { | |
325 | int ret; | |
326 | ||
327 | #ifdef CONFIG_PIPE2 | |
328 | ret = pipe2(pipefd, O_CLOEXEC); | |
329 | if (ret != -1 || errno != ENOSYS) { | |
330 | return ret; | |
331 | } | |
332 | #endif | |
333 | ret = pipe(pipefd); | |
334 | if (ret == 0) { | |
335 | qemu_set_cloexec(pipefd[0]); | |
336 | qemu_set_cloexec(pipefd[1]); | |
337 | } | |
338 | ||
339 | return ret; | |
340 | } | |
341 | #endif | |
342 | ||
343 | /* | |
344 | * Opens a socket with FD_CLOEXEC set | |
345 | */ | |
346 | int qemu_socket(int domain, int type, int protocol) | |
347 | { | |
348 | int ret; | |
349 | ||
350 | #ifdef SOCK_CLOEXEC | |
351 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); | |
352 | if (ret != -1 || errno != EINVAL) { | |
353 | return ret; | |
354 | } | |
355 | #endif | |
356 | ret = socket(domain, type, protocol); | |
357 | if (ret >= 0) { | |
358 | qemu_set_cloexec(ret); | |
359 | } | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
364 | /* | |
365 | * Accept a connection and set FD_CLOEXEC | |
366 | */ | |
367 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) | |
368 | { | |
369 | int ret; | |
370 | ||
371 | #ifdef CONFIG_ACCEPT4 | |
372 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); | |
373 | if (ret != -1 || errno != ENOSYS) { | |
374 | return ret; | |
375 | } | |
376 | #endif | |
377 | ret = accept(s, addr, addrlen); | |
378 | if (ret >= 0) { | |
379 | qemu_set_cloexec(ret); | |
380 | } | |
381 | ||
382 | return ret; | |
383 | } |