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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 | abort(); | |
56 | } | |
57 | return ptr; | |
58 | } | |
59 | #endif | |
60 | ||
61 | #if defined(_WIN32) | |
62 | void *qemu_memalign(size_t alignment, size_t size) | |
63 | { | |
64 | if (!size) { | |
65 | abort(); | |
66 | } | |
67 | return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE)); | |
68 | } | |
69 | ||
70 | void *qemu_vmalloc(size_t size) | |
71 | { | |
72 | /* FIXME: this is not exactly optimal solution since VirtualAlloc | |
73 | has 64Kb granularity, but at least it guarantees us that the | |
74 | memory is page aligned. */ | |
75 | if (!size) { | |
76 | abort(); | |
77 | } | |
78 | return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE)); | |
79 | } | |
80 | ||
81 | void qemu_vfree(void *ptr) | |
82 | { | |
83 | VirtualFree(ptr, 0, MEM_RELEASE); | |
84 | } | |
85 | ||
86 | #else | |
87 | ||
88 | void *qemu_memalign(size_t alignment, size_t size) | |
89 | { | |
90 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) | |
91 | int ret; | |
92 | void *ptr; | |
93 | ret = posix_memalign(&ptr, alignment, size); | |
94 | if (ret != 0) | |
95 | abort(); | |
96 | return ptr; | |
97 | #elif defined(CONFIG_BSD) | |
98 | return oom_check(valloc(size)); | |
99 | #else | |
100 | return oom_check(memalign(alignment, size)); | |
101 | #endif | |
102 | } | |
103 | ||
104 | /* alloc shared memory pages */ | |
105 | void *qemu_vmalloc(size_t size) | |
106 | { | |
107 | return qemu_memalign(getpagesize(), size); | |
108 | } | |
109 | ||
110 | void qemu_vfree(void *ptr) | |
111 | { | |
112 | free(ptr); | |
113 | } | |
114 | ||
115 | #endif | |
116 | ||
117 | int qemu_create_pidfile(const char *filename) | |
118 | { | |
119 | char buffer[128]; | |
120 | int len; | |
121 | #ifndef _WIN32 | |
122 | int fd; | |
123 | ||
124 | fd = qemu_open(filename, O_RDWR | O_CREAT, 0600); | |
125 | if (fd == -1) | |
126 | return -1; | |
127 | ||
128 | if (lockf(fd, F_TLOCK, 0) == -1) | |
129 | return -1; | |
130 | ||
131 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
132 | if (write(fd, buffer, len) != len) | |
133 | return -1; | |
134 | #else | |
135 | HANDLE file; | |
136 | DWORD flags; | |
137 | OVERLAPPED overlap; | |
138 | BOOL ret; | |
139 | ||
140 | /* Open for writing with no sharing. */ | |
141 | file = CreateFile(filename, GENERIC_WRITE, 0, NULL, | |
142 | OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); | |
143 | ||
144 | if (file == INVALID_HANDLE_VALUE) | |
145 | return -1; | |
146 | ||
147 | flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY; | |
148 | overlap.hEvent = 0; | |
149 | /* Lock 1 byte. */ | |
150 | ret = LockFileEx(file, flags, 0, 0, 1, &overlap); | |
151 | if (ret == 0) | |
152 | return -1; | |
153 | ||
154 | /* Write PID to file. */ | |
155 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
156 | ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len, | |
157 | &overlap, NULL); | |
158 | if (ret == 0) | |
159 | return -1; | |
160 | #endif | |
161 | return 0; | |
162 | } | |
163 | ||
164 | #ifdef _WIN32 | |
165 | ||
166 | /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */ | |
167 | #define _W32_FT_OFFSET (116444736000000000ULL) | |
168 | ||
169 | int qemu_gettimeofday(qemu_timeval *tp) | |
170 | { | |
171 | union { | |
172 | unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */ | |
173 | FILETIME ft; | |
174 | } _now; | |
175 | ||
176 | if(tp) | |
177 | { | |
178 | GetSystemTimeAsFileTime (&_now.ft); | |
179 | tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL ); | |
180 | tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL); | |
181 | } | |
182 | /* Always return 0 as per Open Group Base Specifications Issue 6. | |
183 | Do not set errno on error. */ | |
184 | return 0; | |
185 | } | |
186 | #endif /* _WIN32 */ | |
187 | ||
188 | ||
189 | #ifdef _WIN32 | |
190 | void socket_set_nonblock(int fd) | |
191 | { | |
192 | unsigned long opt = 1; | |
193 | ioctlsocket(fd, FIONBIO, &opt); | |
194 | } | |
195 | ||
196 | int inet_aton(const char *cp, struct in_addr *ia) | |
197 | { | |
198 | uint32_t addr = inet_addr(cp); | |
199 | if (addr == 0xffffffff) | |
200 | return 0; | |
201 | ia->s_addr = addr; | |
202 | return 1; | |
203 | } | |
204 | ||
205 | void qemu_set_cloexec(int fd) | |
206 | { | |
207 | } | |
208 | ||
209 | #else | |
210 | ||
211 | void socket_set_nonblock(int fd) | |
212 | { | |
213 | int f; | |
214 | f = fcntl(fd, F_GETFL); | |
215 | fcntl(fd, F_SETFL, f | O_NONBLOCK); | |
216 | } | |
217 | ||
218 | void qemu_set_cloexec(int fd) | |
219 | { | |
220 | int f; | |
221 | f = fcntl(fd, F_GETFD); | |
222 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); | |
223 | } | |
224 | ||
225 | #endif | |
226 | ||
227 | /* | |
228 | * Opens a file with FD_CLOEXEC set | |
229 | */ | |
230 | int qemu_open(const char *name, int flags, ...) | |
231 | { | |
232 | int ret; | |
233 | int mode = 0; | |
234 | ||
235 | if (flags & O_CREAT) { | |
236 | va_list ap; | |
237 | ||
238 | va_start(ap, flags); | |
239 | mode = va_arg(ap, int); | |
240 | va_end(ap); | |
241 | } | |
242 | ||
243 | #ifdef O_CLOEXEC | |
244 | ret = open(name, flags | O_CLOEXEC, mode); | |
245 | #else | |
246 | ret = open(name, flags, mode); | |
247 | if (ret >= 0) { | |
248 | qemu_set_cloexec(ret); | |
249 | } | |
250 | #endif | |
251 | ||
252 | return ret; | |
253 | } | |
254 | ||
255 | #ifndef _WIN32 | |
256 | /* | |
257 | * Creates a pipe with FD_CLOEXEC set on both file descriptors | |
258 | */ | |
259 | int qemu_pipe(int pipefd[2]) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | #ifdef CONFIG_PIPE2 | |
264 | ret = pipe2(pipefd, O_CLOEXEC); | |
265 | if (ret != -1 || errno != ENOSYS) { | |
266 | return ret; | |
267 | } | |
268 | #endif | |
269 | ret = pipe(pipefd); | |
270 | if (ret == 0) { | |
271 | qemu_set_cloexec(pipefd[0]); | |
272 | qemu_set_cloexec(pipefd[1]); | |
273 | } | |
274 | ||
275 | return ret; | |
276 | } | |
277 | #endif | |
278 | ||
279 | /* | |
280 | * Opens a socket with FD_CLOEXEC set | |
281 | */ | |
282 | int qemu_socket(int domain, int type, int protocol) | |
283 | { | |
284 | int ret; | |
285 | ||
286 | #ifdef SOCK_CLOEXEC | |
287 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); | |
288 | if (ret != -1 || errno != EINVAL) { | |
289 | return ret; | |
290 | } | |
291 | #endif | |
292 | ret = socket(domain, type, protocol); | |
293 | if (ret >= 0) { | |
294 | qemu_set_cloexec(ret); | |
295 | } | |
296 | ||
297 | return ret; | |
298 | } | |
299 | ||
300 | /* | |
301 | * Accept a connection and set FD_CLOEXEC | |
302 | */ | |
303 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) | |
304 | { | |
305 | int ret; | |
306 | ||
307 | #ifdef CONFIG_ACCEPT4 | |
308 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); | |
309 | if (ret != -1 || errno != EINVAL) { | |
310 | return ret; | |
311 | } | |
312 | #endif | |
313 | ret = accept(s, addr, addrlen); | |
314 | if (ret >= 0) { | |
315 | qemu_set_cloexec(ret); | |
316 | } | |
317 | ||
318 | return ret; | |
319 | } |