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 #if defined(_WIN32)
  49 void *qemu_memalign(size_t alignment, size_t size)
  50 {
  51     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  52 }
  53
  54 void *qemu_vmalloc(size_t size)
  55 {
  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);
  60 }
  61
  62 void qemu_vfree(void *ptr)
  63 {
  64     VirtualFree(ptr, 0, MEM_RELEASE);
  65 }
  66
  67 #else
  68
  69 #if defined(USE_KQEMU)
  70
  71 #ifdef __OpenBSD__
  72 #include <sys/param.h>
  73 #include <sys/types.h>
  74 #include <sys/mount.h>
  75 #else
  76 #include <sys/vfs.h>
  77 #endif
  78
  79 #include <sys/mman.h>
  80 #include <fcntl.h>
  81
  82 static void *kqemu_vmalloc(size_t size)
  83 {
  84     static int phys_ram_fd = -1;
  85     static int phys_ram_size = 0;
  86     void *ptr;
  87
  88 #ifdef __OpenBSD__ /* no need (?) for a dummy file on OpenBSD */
  89     int map_anon = MAP_ANON;
  90 #else
  91     int map_anon = 0;
  92     const char *tmpdir;
  93     char phys_ram_file[1024];
  94 #ifdef HOST_SOLARIS
  95     struct statvfs stfs;
  96 #else
  97     struct statfs stfs;
  98 #endif
  99
 100     if (phys_ram_fd < 0) {
 101         tmpdir = getenv("QEMU_TMPDIR");
 102         if (!tmpdir)
 103 #ifdef HOST_SOLARIS
 104             tmpdir = "/tmp";
 105         if (statvfs(tmpdir, &stfs) == 0) {
 106 #else
 107             tmpdir = "/dev/shm";
 108         if (statfs(tmpdir, &stfs) == 0) {
 109 #endif
 110             int64_t free_space;
 111             int ram_mb;
 112
 113             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 114             if ((ram_size + 8192 * 1024) >= free_space) {
 115                 ram_mb = (ram_size / (1024 * 1024));
 116                 fprintf(stderr,
 117                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 118                         tmpdir, ram_mb);
 119                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 120                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 121                             "mount -o remount,size=%dm /dev/shm\n",
 122                             ram_mb + 16);
 123                 } else {
 124                     fprintf(stderr,
 125                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 126                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 127                             "temporary RAM file will be opened.\n");
 128                 }
 129                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 130                 exit(1);
 131             }
 132         }
 133         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 134                  tmpdir);
 135         phys_ram_fd = mkstemp(phys_ram_file);
 136         if (phys_ram_fd < 0) {
 137             fprintf(stderr,
 138                     "warning: could not create temporary file in '%s'.\n"
 139                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 140                     "Using '/tmp' as fallback.\n",
 141                     tmpdir);
 142             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 143                      "/tmp");
 144             phys_ram_fd = mkstemp(phys_ram_file);
 145             if (phys_ram_fd < 0) {
 146                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 147                         phys_ram_file);
 148                 exit(1);
 149             }
 150         }
 151         unlink(phys_ram_file);
 152     }
 153     size = (size + 4095) & ~4095;
 154     ftruncate(phys_ram_fd, phys_ram_size + size);
 155 #endif /* !__OpenBSD__ */
 156     ptr = mmap(NULL,
 157                size,
 158                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 159                phys_ram_fd, phys_ram_size);
 160     if (ptr == MAP_FAILED) {
 161         fprintf(stderr, "Could not map physical memory\n");
 162         exit(1);
 163     }
 164     phys_ram_size += size;
 165     return ptr;
 166 }
 167
 168 static void kqemu_vfree(void *ptr)
 169 {
 170     /* may be useful some day, but currently we do not need to free */
 171 }
 172
 173 #endif
 174
 175 void *qemu_memalign(size_t alignment, size_t size)
 176 {
 177 #if defined(_POSIX_C_SOURCE)
 178     int ret;
 179     void *ptr;
 180     ret = posix_memalign(&ptr, alignment, size);
 181     if (ret != 0)
 182         return NULL;
 183     return ptr;
 184 #elif defined(_BSD)
 185     return valloc(size);
 186 #else
 187     return memalign(alignment, size);
 188 #endif
 189 }
 190
 191 /* alloc shared memory pages */
 192 void *qemu_vmalloc(size_t size)
 193 {
 194 #if defined(USE_KQEMU)
 195     if (kqemu_allowed)
 196         return kqemu_vmalloc(size);
 197 #endif
 198 #ifdef _BSD
 199     return valloc(size);
 200 #else
 201     return memalign(4096, size);
 202 #endif
 203 }
 204
 205 void qemu_vfree(void *ptr)
 206 {
 207 #if defined(USE_KQEMU)
 208     if (kqemu_allowed)
 209         kqemu_vfree(ptr);
 210 #endif
 211     free(ptr);
 212 }
 213
 214 #endif
 215
 216 int qemu_create_pidfile(const char *filename)
 217 {
 218     char buffer[128];
 219     int len;
 220 #ifndef _WIN32
 221     int fd;
 222
 223     fd = open(filename, O_RDWR | O_CREAT, 0600);
 224     if (fd == -1)
 225         return -1;
 226
 227     if (lockf(fd, F_TLOCK, 0) == -1)
 228         return -1;
 229
 230     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 231     if (write(fd, buffer, len) != len)
 232         return -1;
 233 #else
 234     HANDLE file;
 235     DWORD flags;
 236     OVERLAPPED overlap;
 237     BOOL ret;
 238
 239     /* Open for writing with no sharing. */
 240     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 241                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 242
 243     if (file == INVALID_HANDLE_VALUE)
 244       return -1;
 245
 246     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 247     overlap.hEvent = 0;
 248     /* Lock 1 byte. */
 249     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 250     if (ret == 0)
 251       return -1;
 252
 253     /* Write PID to file. */
 254     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 255     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 256                       &overlap, NULL);
 257     if (ret == 0)
 258       return -1;
 259 #endif
 260     return 0;
 261 }
 262
 263 #ifdef _WIN32
 264
 265 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 266 #define _W32_FT_OFFSET (116444736000000000ULL)
 267
 268 int qemu_gettimeofday(qemu_timeval *tp)
 269 {
 270   union {
 271     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 272     FILETIME ft;
 273   }  _now;
 274
 275   if(tp)
 276     {
 277       GetSystemTimeAsFileTime (&_now.ft);
 278       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 279       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 280     }
 281   /* Always return 0 as per Open Group Base Specifications Issue 6.
 282      Do not set errno on error.  */
 283   return 0;
 284 }
 285 #endif /* _WIN32 */