osdep.c

   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 long qemu_getpagesize(void)
  70 {
  71     SYSTEM_INFO system_info;
  72
  73     GetSystemInfo(&system_info);
  74     return system_info.dwPageSize;
  75 }
  76
  77 #else
  78
  79 #if defined(USE_KQEMU)
  80
  81 #ifdef __OpenBSD__
  82 #include <sys/param.h>
  83 #include <sys/types.h>
  84 #include <sys/mount.h>
  85 #else
  86 #include <sys/vfs.h>
  87 #endif
  88
  89 #include <sys/mman.h>
  90 #include <fcntl.h>
  91
  92 static void *kqemu_vmalloc(size_t size)
  93 {
  94     static int phys_ram_fd = -1;
  95     static int phys_ram_size = 0;
  96     void *ptr;
  97
  98 #ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
  99     int map_anon = MAP_ANON;
 100 #else
 101     int map_anon = 0;
 102     const char *tmpdir;
 103     char phys_ram_file[1024];
 104 #ifdef HOST_SOLARIS
 105     struct statvfs stfs;
 106 #else
 107     struct statfs stfs;
 108 #endif
 109
 110     if (phys_ram_fd < 0) {
 111         tmpdir = getenv("QEMU_TMPDIR");
 112         if (!tmpdir)
 113 #ifdef HOST_SOLARIS
 114             tmpdir = "/tmp";
 115         if (statvfs(tmpdir, &stfs) == 0) {
 116 #else
 117             tmpdir = "/dev/shm";
 118         if (statfs(tmpdir, &stfs) == 0) {
 119 #endif
 120             int64_t free_space;
 121             int ram_mb;
 122
 123             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 124             if ((ram_size + 8192 * 1024) >= free_space) {
 125                 ram_mb = (ram_size / (1024 * 1024));
 126                 fprintf(stderr,
 127                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 128                         tmpdir, ram_mb);
 129                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 130                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 131                             "mount -o remount,size=%dm /dev/shm\n",
 132                             ram_mb + 16);
 133                 } else {
 134                     fprintf(stderr,
 135                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 136                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 137                             "temporary RAM file will be opened.\n");
 138                 }
 139                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 140                 exit(1);
 141             }
 142         }
 143         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 144                  tmpdir);
 145         phys_ram_fd = mkstemp(phys_ram_file);
 146         if (phys_ram_fd < 0) {
 147             fprintf(stderr,
 148                     "warning: could not create temporary file in '%s'.\n"
 149                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 150                     "Using '/tmp' as fallback.\n",
 151                     tmpdir);
 152             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 153                      "/tmp");
 154             phys_ram_fd = mkstemp(phys_ram_file);
 155             if (phys_ram_fd < 0) {
 156                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 157                         phys_ram_file);
 158                 exit(1);
 159             }
 160         }
 161         unlink(phys_ram_file);
 162     }
 163     size = (size + 4095) & ~4095;
 164     ftruncate(phys_ram_fd, phys_ram_size + size);
 165 #endif /* !__OpenBSD__ */
 166     ptr = mmap(NULL,
 167                size,
 168                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 169                phys_ram_fd, phys_ram_size);
 170     if (ptr == MAP_FAILED) {
 171         fprintf(stderr, "Could not map physical memory\n");
 172         exit(1);
 173     }
 174     phys_ram_size += size;
 175     return ptr;
 176 }
 177
 178 static void kqemu_vfree(void *ptr)
 179 {
 180     /* may be useful some day, but currently we do not need to free */
 181 }
 182
 183 #endif
 184
 185 void *qemu_memalign(size_t alignment, size_t size)
 186 {
 187 #if defined(_POSIX_C_SOURCE)
 188     int ret;
 189     void *ptr;
 190     ret = posix_memalign(&ptr, alignment, size);
 191     if (ret != 0)
 192         return NULL;
 193     return ptr;
 194 #elif defined(_BSD)
 195     return valloc(size);
 196 #else
 197     return memalign(alignment, size);
 198 #endif
 199 }
 200
 201 long qemu_getpagesize(void)
 202 {
 203     return sysconf(_SC_PAGESIZE);
 204 }
 205
 206 /* alloc shared memory pages */
 207 void *qemu_vmalloc(size_t size)
 208 {
 209 #if defined(USE_KQEMU)
 210     if (kqemu_allowed)
 211         return kqemu_vmalloc(size);
 212 #endif
 213 #ifdef _BSD
 214     return valloc(size);
 215 #else
 216     return memalign(4096, size);
 217 #endif
 218 }
 219
 220 void qemu_vfree(void *ptr)
 221 {
 222 #if defined(USE_KQEMU)
 223     if (kqemu_allowed)
 224         kqemu_vfree(ptr);
 225 #endif
 226     free(ptr);
 227 }
 228
 229 #endif
 230
 231 int qemu_create_pidfile(const char *filename)
 232 {
 233     char buffer[128];
 234     int len;
 235 #ifndef _WIN32
 236     int fd;
 237
 238     fd = open(filename, O_RDWR | O_CREAT, 0600);
 239     if (fd == -1)
 240         return -1;
 241
 242     if (lockf(fd, F_TLOCK, 0) == -1)
 243         return -1;
 244
 245     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 246     if (write(fd, buffer, len) != len)
 247         return -1;
 248 #else
 249     HANDLE file;
 250     DWORD flags;
 251     OVERLAPPED overlap;
 252     BOOL ret;
 253
 254     /* Open for writing with no sharing. */
 255     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 256                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 257
 258     if (file == INVALID_HANDLE_VALUE)
 259       return -1;
 260
 261     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 262     overlap.hEvent = 0;
 263     /* Lock 1 byte. */
 264     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 265     if (ret == 0)
 266       return -1;
 267
 268     /* Write PID to file. */
 269     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 270     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 271                       &overlap, NULL);
 272     if (ret == 0)
 273       return -1;
 274 #endif
 275     return 0;
 276 }
 277
 278 #ifdef _WIN32
 279
 280 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 281 #define _W32_FT_OFFSET (116444736000000000ULL)
 282
 283 int qemu_gettimeofday(qemu_timeval *tp)
 284 {
 285   union {
 286     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 287     FILETIME ft;
 288   }  _now;
 289
 290   if(tp)
 291     {
 292       GetSystemTimeAsFileTime (&_now.ft);
 293       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 294       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 295     }
 296   /* Always return 0 as per Open Group Base Specifications Issue 6.
 297      Do not set errno on error.  */
 298   return 0;
 299 }
 300 #endif /* _WIN32 */
 301
 302
 303 #ifdef _WIN32
 304 void socket_set_nonblock(int fd)
 305 {
 306     unsigned long opt = 1;
 307     ioctlsocket(fd, FIONBIO, &opt);
 308 }
 309
 310 int inet_aton(const char *cp, struct in_addr *ia)
 311 {
 312     uint32_t addr = inet_addr(cp);
 313     if (addr == 0xffffffff)
 314         return 0;
 315     ia->s_addr = addr;
 316     return 1;
 317 }
 318 #else
 319 void socket_set_nonblock(int fd)
 320 {
 321     int f;
 322     f = fcntl(fd, F_GETFL);
 323     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 324 }
 325 #endif