aboutsummaryrefslogtreecommitdiff
path: root/osdep.c
blob: dbf872aea79b999312f9d1d590c92ef0e4fef009 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
/*
 * QEMU low level functions
 *
 * Copyright (c) 2003 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

/* Needed early for CONFIG_BSD etc. */
#include "config-host.h"

#ifdef CONFIG_SOLARIS
#include <sys/types.h>
#include <sys/statvfs.h>
#endif

#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif

#ifdef _WIN32
#include <windows.h>
#elif defined(CONFIG_BSD)
#include <stdlib.h>
#else
#include <malloc.h>
#endif

#include "qemu-common.h"
#include "sysemu.h"
#include "qemu_socket.h"

#if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
static void *oom_check(void *ptr)
{
    if (ptr == NULL) {
#if defined(_WIN32)
        fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
#else
        fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
#endif
        abort();
    }
    return ptr;
}
#endif

#if defined(_WIN32)
void *qemu_memalign(size_t alignment, size_t size)
{
    if (!size) {
        abort();
    }
    return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
}

void *qemu_vmalloc(size_t size)
{
    /* FIXME: this is not exactly optimal solution since VirtualAlloc
       has 64Kb granularity, but at least it guarantees us that the
       memory is page aligned. */
    if (!size) {
        abort();
    }
    return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
}

void qemu_vfree(void *ptr)
{
    VirtualFree(ptr, 0, MEM_RELEASE);
}

#else

void *qemu_memalign(size_t alignment, size_t size)
{
#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
    int ret;
    void *ptr;
    ret = posix_memalign(&ptr, alignment, size);
    if (ret != 0) {
        fprintf(stderr, "Failed to allocate %zu B: %s\n",
                size, strerror(ret));
        abort();
    }
    return ptr;
#elif defined(CONFIG_BSD)
    return oom_check(valloc(size));
#else
    return oom_check(memalign(alignment, size));
#endif
}

/* alloc shared memory pages */
void *qemu_vmalloc(size_t size)
{
    return qemu_memalign(getpagesize(), size);
}

void qemu_vfree(void *ptr)
{
    free(ptr);
}

#endif

int qemu_create_pidfile(const char *filename)
{
    char buffer[128];
    int len;
#ifndef _WIN32
    int fd;

    fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
    if (fd == -1)
        return -1;

    if (lockf(fd, F_TLOCK, 0) == -1)
        return -1;

    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
    if (write(fd, buffer, len) != len)
        return -1;
#else
    HANDLE file;
    OVERLAPPED overlap;
    BOOL ret;
    memset(&overlap, 0, sizeof(overlap));

    file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
		      OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    if (file == INVALID_HANDLE_VALUE)
      return -1;

    len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
    ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
		      &overlap, NULL);
    if (ret == 0)
      return -1;
#endif
    return 0;
}

#ifdef _WIN32

/* mingw32 needs ffs for compilations without optimization. */
int ffs(int i)
{
    /* Use gcc's builtin ffs. */
    return __builtin_ffs(i);
}

/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
#define _W32_FT_OFFSET (116444736000000000ULL)

int qemu_gettimeofday(qemu_timeval *tp)
{
  union {
    unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
    FILETIME ft;
  }  _now;

  if(tp)
    {
      GetSystemTimeAsFileTime (&_now.ft);
      tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
      tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
    }
  /* Always return 0 as per Open Group Base Specifications Issue 6.
     Do not set errno on error.  */
  return 0;
}
#endif /* _WIN32 */


#ifdef _WIN32
void socket_set_nonblock(int fd)
{
    unsigned long opt = 1;
    ioctlsocket(fd, FIONBIO, &opt);
}

int inet_aton(const char *cp, struct in_addr *ia)
{
    uint32_t addr = inet_addr(cp);
    if (addr == 0xffffffff)
	return 0;
    ia->s_addr = addr;
    return 1;
}

void qemu_set_cloexec(int fd)
{
}

#else

void socket_set_nonblock(int fd)
{
    int f;
    f = fcntl(fd, F_GETFL);
    fcntl(fd, F_SETFL, f | O_NONBLOCK);
}

void qemu_set_cloexec(int fd)
{
    int f;
    f = fcntl(fd, F_GETFD);
    fcntl(fd, F_SETFD, f | FD_CLOEXEC);
}

#endif

/*
 * Opens a file with FD_CLOEXEC set
 */
int qemu_open(const char *name, int flags, ...)
{
    int ret;
    int mode = 0;

    if (flags & O_CREAT) {
        va_list ap;

        va_start(ap, flags);
        mode = va_arg(ap, int);
        va_end(ap);
    }

#ifdef O_CLOEXEC
    ret = open(name, flags | O_CLOEXEC, mode);
#else
    ret = open(name, flags, mode);
    if (ret >= 0) {
        qemu_set_cloexec(ret);
    }
#endif

    return ret;
}

/*
 * A variant of write(2) which handles partial write.
 *
 * Return the number of bytes transferred.
 * Set errno if fewer than `count' bytes are written.
 *
 * This function don't work with non-blocking fd's.
 * Any of the possibilities with non-bloking fd's is bad:
 *   - return a short write (then name is wrong)
 *   - busy wait adding (errno == EAGAIN) to the loop
 */
ssize_t qemu_write_full(int fd, const void *buf, size_t count)
{
    ssize_t ret = 0;
    ssize_t total = 0;

    while (count) {
        ret = write(fd, buf, count);
        if (ret < 0) {
            if (errno == EINTR)
                continue;
            break;
        }

        count -= ret;
        buf += ret;
        total += ret;
    }

    return total;
}

#ifndef _WIN32
/*
 * Creates an eventfd that looks like a pipe and has EFD_CLOEXEC set.
 */
int qemu_eventfd(int fds[2])
{
#ifdef CONFIG_EVENTFD
    int ret;

    ret = eventfd(0, 0);
    if (ret >= 0) {
        fds[0] = ret;
        qemu_set_cloexec(ret);
        if ((fds[1] = dup(ret)) == -1) {
            close(ret);
            return -1;
        }
        qemu_set_cloexec(fds[1]);
        return 0;
    }

    if (errno != ENOSYS) {
        return -1;
    }
#endif

    return qemu_pipe(fds);
}

/*
 * Creates a pipe with FD_CLOEXEC set on both file descriptors
 */
int qemu_pipe(int pipefd[2])
{
    int ret;

#ifdef CONFIG_PIPE2
    ret = pipe2(pipefd, O_CLOEXEC);
    if (ret != -1 || errno != ENOSYS) {
        return ret;
    }
#endif
    ret = pipe(pipefd);
    if (ret == 0) {
        qemu_set_cloexec(pipefd[0]);
        qemu_set_cloexec(pipefd[1]);
    }

    return ret;
}
#endif

/*
 * Opens a socket with FD_CLOEXEC set
 */
int qemu_socket(int domain, int type, int protocol)
{
    int ret;

#ifdef SOCK_CLOEXEC
    ret = socket(domain, type | SOCK_CLOEXEC, protocol);
    if (ret != -1 || errno != EINVAL) {
        return ret;
    }
#endif
    ret = socket(domain, type, protocol);
    if (ret >= 0) {
        qemu_set_cloexec(ret);
    }

    return ret;
}

/*
 * Accept a connection and set FD_CLOEXEC
 */
int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
    int ret;

#ifdef CONFIG_ACCEPT4
    ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
    if (ret != -1 || errno != ENOSYS) {
        return ret;
    }
#endif
    ret = accept(s, addr, addrlen);
    if (ret >= 0) {
        qemu_set_cloexec(ret);
    }

    return ret;
}