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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 HOST_SOLARIS | |
32 | #include <sys/types.h> | |
33 | #include <sys/statvfs.h> | |
34 | #endif | |
35 | ||
36 | #include "qemu-common.h" | |
37 | #include "sysemu.h" | |
38 | ||
39 | #ifdef _WIN32 | |
40 | #define WIN32_LEAN_AND_MEAN | |
41 | #include <windows.h> | |
42 | #elif defined(_BSD) | |
43 | #include <stdlib.h> | |
44 | #else | |
45 | #include <malloc.h> | |
46 | #endif | |
47 | ||
48 | #include "qemu_socket.h" | |
49 | ||
50 | #if defined(_WIN32) | |
51 | void *qemu_memalign(size_t alignment, size_t size) | |
52 | { | |
53 | return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE); | |
54 | } | |
55 | ||
56 | void *qemu_vmalloc(size_t size) | |
57 | { | |
58 | /* FIXME: this is not exactly optimal solution since VirtualAlloc | |
59 | has 64Kb granularity, but at least it guarantees us that the | |
60 | memory is page aligned. */ | |
61 | return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE); | |
62 | } | |
63 | ||
64 | void qemu_vfree(void *ptr) | |
65 | { | |
66 | VirtualFree(ptr, 0, MEM_RELEASE); | |
67 | } | |
68 | ||
69 | #else | |
70 | ||
71 | #if defined(USE_KQEMU) | |
72 | ||
73 | #ifdef __OpenBSD__ | |
74 | #include <sys/param.h> | |
75 | #include <sys/types.h> | |
76 | #include <sys/mount.h> | |
77 | #else | |
78 | #ifndef __FreeBSD__ | |
79 | #include <sys/vfs.h> | |
80 | #endif | |
81 | #endif | |
82 | ||
83 | #include <sys/mman.h> | |
84 | #include <fcntl.h> | |
85 | ||
86 | static void *kqemu_vmalloc(size_t size) | |
87 | { | |
88 | static int phys_ram_fd = -1; | |
89 | static int phys_ram_size = 0; | |
90 | void *ptr; | |
91 | ||
92 | /* no need (?) for a dummy file on OpenBSD/FreeBSD */ | |
93 | #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
94 | int map_anon = MAP_ANON; | |
95 | #else | |
96 | int map_anon = 0; | |
97 | const char *tmpdir; | |
98 | char phys_ram_file[1024]; | |
99 | #ifdef HOST_SOLARIS | |
100 | struct statvfs stfs; | |
101 | #else | |
102 | struct statfs stfs; | |
103 | #endif | |
104 | ||
105 | if (phys_ram_fd < 0) { | |
106 | tmpdir = getenv("QEMU_TMPDIR"); | |
107 | if (!tmpdir) | |
108 | #ifdef HOST_SOLARIS | |
109 | tmpdir = "/tmp"; | |
110 | if (statvfs(tmpdir, &stfs) == 0) { | |
111 | #else | |
112 | tmpdir = "/dev/shm"; | |
113 | if (statfs(tmpdir, &stfs) == 0) { | |
114 | #endif | |
115 | int64_t free_space; | |
116 | int ram_mb; | |
117 | ||
118 | free_space = (int64_t)stfs.f_bavail * stfs.f_bsize; | |
119 | if ((ram_size + 8192 * 1024) >= free_space) { | |
120 | ram_mb = (ram_size / (1024 * 1024)); | |
121 | fprintf(stderr, | |
122 | "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n", | |
123 | tmpdir, ram_mb); | |
124 | if (strcmp(tmpdir, "/dev/shm") == 0) { | |
125 | fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n" | |
126 | "mount -o remount,size=%dm /dev/shm\n", | |
127 | ram_mb + 16); | |
128 | } else { | |
129 | fprintf(stderr, | |
130 | "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n" | |
131 | "QEMU_TMPDIR environment variable to set another directory where the QEMU\n" | |
132 | "temporary RAM file will be opened.\n"); | |
133 | } | |
134 | fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n"); | |
135 | exit(1); | |
136 | } | |
137 | } | |
138 | snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", | |
139 | tmpdir); | |
140 | phys_ram_fd = mkstemp(phys_ram_file); | |
141 | if (phys_ram_fd < 0) { | |
142 | fprintf(stderr, | |
143 | "warning: could not create temporary file in '%s'.\n" | |
144 | "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n" | |
145 | "Using '/tmp' as fallback.\n", | |
146 | tmpdir); | |
147 | snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", | |
148 | "/tmp"); | |
149 | phys_ram_fd = mkstemp(phys_ram_file); | |
150 | if (phys_ram_fd < 0) { | |
151 | fprintf(stderr, "Could not create temporary memory file '%s'\n", | |
152 | phys_ram_file); | |
153 | exit(1); | |
154 | } | |
155 | } | |
156 | unlink(phys_ram_file); | |
157 | } | |
158 | size = (size + 4095) & ~4095; | |
159 | ftruncate(phys_ram_fd, phys_ram_size + size); | |
160 | #endif /* !(__OpenBSD__ || __FreeBSD__) */ | |
161 | ptr = mmap(NULL, | |
162 | size, | |
163 | PROT_WRITE | PROT_READ, map_anon | MAP_SHARED, | |
164 | phys_ram_fd, phys_ram_size); | |
165 | if (ptr == MAP_FAILED) { | |
166 | fprintf(stderr, "Could not map physical memory\n"); | |
167 | exit(1); | |
168 | } | |
169 | phys_ram_size += size; | |
170 | return ptr; | |
171 | } | |
172 | ||
173 | static void kqemu_vfree(void *ptr) | |
174 | { | |
175 | /* may be useful some day, but currently we do not need to free */ | |
176 | } | |
177 | ||
178 | #endif | |
179 | ||
180 | void *qemu_memalign(size_t alignment, size_t size) | |
181 | { | |
182 | #if defined(_POSIX_C_SOURCE) | |
183 | int ret; | |
184 | void *ptr; | |
185 | ret = posix_memalign(&ptr, alignment, size); | |
186 | if (ret != 0) | |
187 | return NULL; | |
188 | return ptr; | |
189 | #elif defined(_BSD) | |
190 | return valloc(size); | |
191 | #else | |
192 | return memalign(alignment, size); | |
193 | #endif | |
194 | } | |
195 | ||
196 | /* alloc shared memory pages */ | |
197 | void *qemu_vmalloc(size_t size) | |
198 | { | |
199 | #if defined(USE_KQEMU) | |
200 | if (kqemu_allowed) | |
201 | return kqemu_vmalloc(size); | |
202 | #endif | |
203 | return qemu_memalign(getpagesize(), size); | |
204 | } | |
205 | ||
206 | void qemu_vfree(void *ptr) | |
207 | { | |
208 | #if defined(USE_KQEMU) | |
209 | if (kqemu_allowed) | |
210 | kqemu_vfree(ptr); | |
211 | #endif | |
212 | free(ptr); | |
213 | } | |
214 | ||
215 | #endif | |
216 | ||
217 | int qemu_create_pidfile(const char *filename) | |
218 | { | |
219 | char buffer[128]; | |
220 | int len; | |
221 | #ifndef _WIN32 | |
222 | int fd; | |
223 | ||
224 | fd = open(filename, O_RDWR | O_CREAT, 0600); | |
225 | if (fd == -1) | |
226 | return -1; | |
227 | ||
228 | if (lockf(fd, F_TLOCK, 0) == -1) | |
229 | return -1; | |
230 | ||
231 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
232 | if (write(fd, buffer, len) != len) | |
233 | return -1; | |
234 | #else | |
235 | HANDLE file; | |
236 | DWORD flags; | |
237 | OVERLAPPED overlap; | |
238 | BOOL ret; | |
239 | ||
240 | /* Open for writing with no sharing. */ | |
241 | file = CreateFile(filename, GENERIC_WRITE, 0, NULL, | |
242 | OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); | |
243 | ||
244 | if (file == INVALID_HANDLE_VALUE) | |
245 | return -1; | |
246 | ||
247 | flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY; | |
248 | overlap.hEvent = 0; | |
249 | /* Lock 1 byte. */ | |
250 | ret = LockFileEx(file, flags, 0, 0, 1, &overlap); | |
251 | if (ret == 0) | |
252 | return -1; | |
253 | ||
254 | /* Write PID to file. */ | |
255 | len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid()); | |
256 | ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len, | |
257 | &overlap, NULL); | |
258 | if (ret == 0) | |
259 | return -1; | |
260 | #endif | |
261 | return 0; | |
262 | } | |
263 | ||
264 | #ifdef _WIN32 | |
265 | ||
266 | /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */ | |
267 | #define _W32_FT_OFFSET (116444736000000000ULL) | |
268 | ||
269 | int qemu_gettimeofday(qemu_timeval *tp) | |
270 | { | |
271 | union { | |
272 | unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */ | |
273 | FILETIME ft; | |
274 | } _now; | |
275 | ||
276 | if(tp) | |
277 | { | |
278 | GetSystemTimeAsFileTime (&_now.ft); | |
279 | tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL ); | |
280 | tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL); | |
281 | } | |
282 | /* Always return 0 as per Open Group Base Specifications Issue 6. | |
283 | Do not set errno on error. */ | |
284 | return 0; | |
285 | } | |
286 | #endif /* _WIN32 */ | |
287 | ||
288 | ||
289 | #ifdef _WIN32 | |
290 | void socket_set_nonblock(int fd) | |
291 | { | |
292 | unsigned long opt = 1; | |
293 | ioctlsocket(fd, FIONBIO, &opt); | |
294 | } | |
295 | ||
296 | int inet_aton(const char *cp, struct in_addr *ia) | |
297 | { | |
298 | uint32_t addr = inet_addr(cp); | |
299 | if (addr == 0xffffffff) | |
300 | return 0; | |
301 | ia->s_addr = addr; | |
302 | return 1; | |
303 | } | |
304 | #else | |
305 | void socket_set_nonblock(int fd) | |
306 | { | |
307 | int f; | |
308 | f = fcntl(fd, F_GETFL); | |
309 | fcntl(fd, F_SETFL, f | O_NONBLOCK); | |
310 | } | |
311 | #endif |