root / osdep.c @ 57448a97
History | View | Annotate | Download (8 kB)
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 |
} |