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