Replace SIGUSR1 in io-thread with eventfd()
[qemu-kvm/fedora.git] / osdep.c
blobdf8042627307d283603ed5626d7e7742b86feb2e
1 /*
2 * QEMU low level functions
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
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
36 #include "qemu-common.h"
37 #include "sysemu.h"
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
48 #if defined(_WIN32)
49 void *qemu_memalign(size_t alignment, size_t size)
51 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
54 void *qemu_vmalloc(size_t size)
56 /* FIXME: this is not exactly optimal solution since VirtualAlloc
57 has 64Kb granularity, but at least it guarantees us that the
58 memory is page aligned. */
59 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
62 void qemu_vfree(void *ptr)
64 VirtualFree(ptr, 0, MEM_RELEASE);
67 #else
69 #if defined(USE_KQEMU)
71 #include <sys/vfs.h>
72 #include <sys/mman.h>
73 #include <fcntl.h>
75 static void *kqemu_vmalloc(size_t size)
77 static int phys_ram_fd = -1;
78 static int phys_ram_size = 0;
79 const char *tmpdir;
80 char phys_ram_file[1024];
81 void *ptr;
82 #ifdef HOST_SOLARIS
83 struct statvfs stfs;
84 #else
85 struct statfs stfs;
86 #endif
88 if (phys_ram_fd < 0) {
89 tmpdir = getenv("QEMU_TMPDIR");
90 if (!tmpdir)
91 #ifdef HOST_SOLARIS
92 tmpdir = "/tmp";
93 if (statvfs(tmpdir, &stfs) == 0) {
94 #else
95 tmpdir = "/dev/shm";
96 if (statfs(tmpdir, &stfs) == 0) {
97 #endif
98 int64_t free_space;
99 int ram_mb;
101 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
102 if ((ram_size + 8192 * 1024) >= free_space) {
103 ram_mb = (ram_size / (1024 * 1024));
104 fprintf(stderr,
105 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
106 tmpdir, ram_mb);
107 if (strcmp(tmpdir, "/dev/shm") == 0) {
108 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
109 "mount -o remount,size=%dm /dev/shm\n",
110 ram_mb + 16);
111 } else {
112 fprintf(stderr,
113 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
114 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
115 "temporary RAM file will be opened.\n");
117 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
118 exit(1);
121 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
122 tmpdir);
123 phys_ram_fd = mkstemp(phys_ram_file);
124 if (phys_ram_fd < 0) {
125 fprintf(stderr,
126 "warning: could not create temporary file in '%s'.\n"
127 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
128 "Using '/tmp' as fallback.\n",
129 tmpdir);
130 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
131 "/tmp");
132 phys_ram_fd = mkstemp(phys_ram_file);
133 if (phys_ram_fd < 0) {
134 fprintf(stderr, "Could not create temporary memory file '%s'\n",
135 phys_ram_file);
136 exit(1);
139 unlink(phys_ram_file);
141 size = (size + 4095) & ~4095;
142 ftruncate(phys_ram_fd, phys_ram_size + size);
143 ptr = mmap(NULL,
144 size,
145 PROT_WRITE | PROT_READ, MAP_SHARED,
146 phys_ram_fd, phys_ram_size);
147 if (ptr == MAP_FAILED) {
148 fprintf(stderr, "Could not map physical memory\n");
149 exit(1);
151 phys_ram_size += size;
152 return ptr;
155 static void kqemu_vfree(void *ptr)
157 /* may be useful some day, but currently we do not need to free */
160 #endif
162 void *qemu_memalign(size_t alignment, size_t size)
164 #if defined(_POSIX_C_SOURCE)
165 int ret;
166 void *ptr;
167 ret = posix_memalign(&ptr, alignment, size);
168 if (ret != 0)
169 return NULL;
170 return ptr;
171 #elif defined(_BSD)
172 return valloc(size);
173 #else
174 return memalign(alignment, size);
175 #endif
178 /* alloc shared memory pages */
179 void *qemu_vmalloc(size_t size)
181 #if defined(USE_KQEMU)
182 if (kqemu_allowed)
183 return kqemu_vmalloc(size);
184 #endif
185 #ifdef _BSD
186 return valloc(size);
187 #else
188 return memalign(TARGET_PAGE_SIZE, size);
189 #endif
192 void qemu_vfree(void *ptr)
194 #if defined(USE_KQEMU)
195 if (kqemu_allowed)
196 kqemu_vfree(ptr);
197 #endif
198 free(ptr);
201 #endif
203 int qemu_create_pidfile(const char *filename)
205 char buffer[128];
206 int len;
207 #ifndef _WIN32
208 int fd;
210 fd = open(filename, O_RDWR | O_CREAT, 0600);
211 if (fd == -1)
212 return -1;
214 if (lockf(fd, F_TLOCK, 0) == -1)
215 return -1;
217 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
218 if (write(fd, buffer, len) != len)
219 return -1;
220 #else
221 HANDLE file;
222 DWORD flags;
223 OVERLAPPED overlap;
224 BOOL ret;
226 /* Open for writing with no sharing. */
227 file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
228 OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
230 if (file == INVALID_HANDLE_VALUE)
231 return -1;
233 flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
234 overlap.hEvent = 0;
235 /* Lock 1 byte. */
236 ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
237 if (ret == 0)
238 return -1;
240 /* Write PID to file. */
241 len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
242 ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
243 &overlap, NULL);
244 if (ret == 0)
245 return -1;
246 #endif
247 return 0;
250 #ifdef _WIN32
252 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
253 #define _W32_FT_OFFSET (116444736000000000ULL)
255 int qemu_gettimeofday(qemu_timeval *tp)
257 union {
258 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
259 FILETIME ft;
260 } _now;
262 if(tp)
264 GetSystemTimeAsFileTime (&_now.ft);
265 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
266 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
268 /* Always return 0 as per Open Group Base Specifications Issue 6.
269 Do not set errno on error. */
270 return 0;
272 #endif /* _WIN32 */