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 #include <windows.h>
  41 #elif defined(_BSD)
  42 #include <stdlib.h>
  43 #else
  44 #include <malloc.h>
  45 #endif
  46
  47 void *get_mmap_addr(unsigned long size)
  48 {
  49     return NULL;
  50 }
  51
  52 void qemu_free(void *ptr)
  53 {
  54     free(ptr);
  55 }
  56
  57 void *qemu_malloc(size_t size)
  58 {
  59     return malloc(size);
  60 }
  61
  62 #if defined(_WIN32)
  63
  64 void *qemu_vmalloc(size_t size)
  65 {
  66     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  67        has 64Kb granularity, but at least it guarantees us that the
  68        memory is page aligned. */
  69     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  70 }
  71
  72 void qemu_vfree(void *ptr)
  73 {
  74     VirtualFree(ptr, 0, MEM_RELEASE);
  75 }
  76
  77 #else
  78
  79 #if defined(USE_KQEMU)
  80
  81 #include <sys/vfs.h>
  82 #include <sys/mman.h>
  83 #include <fcntl.h>
  84
  85 void *kqemu_vmalloc(size_t size)
  86 {
  87     static int phys_ram_fd = -1;
  88     static int phys_ram_size = 0;
  89     const char *tmpdir;
  90     char phys_ram_file[1024];
  91     void *ptr;
  92 #ifdef HOST_SOLARIS
  93     struct statvfs stfs;
  94 #else
  95     struct statfs stfs;
  96 #endif
  97
  98     if (phys_ram_fd < 0) {
  99         tmpdir = getenv("QEMU_TMPDIR");
 100         if (!tmpdir)
 101 #ifdef HOST_SOLARIS
 102             tmpdir = "/tmp";
 103         if (statvfs(tmpdir, &stfs) == 0) {
 104 #else
 105             tmpdir = "/dev/shm";
 106         if (statfs(tmpdir, &stfs) == 0) {
 107 #endif
 108             int64_t free_space;
 109             int ram_mb;
 110
 111             extern int ram_size;
 112             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 113             if ((ram_size + 8192 * 1024) >= free_space) {
 114                 ram_mb = (ram_size / (1024 * 1024));
 115                 fprintf(stderr,
 116                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 117                         tmpdir, ram_mb);
 118                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 119                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 120                             "umount /dev/shm\n"
 121                             "mount -t tmpfs -o size=%dm none /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     ptr = mmap(NULL,
 156                size,
 157                PROT_WRITE | PROT_READ, MAP_SHARED,
 158                phys_ram_fd, phys_ram_size);
 159     if (ptr == MAP_FAILED) {
 160         fprintf(stderr, "Could not map physical memory\n");
 161         exit(1);
 162     }
 163     phys_ram_size += size;
 164     return ptr;
 165 }
 166
 167 void kqemu_vfree(void *ptr)
 168 {
 169     /* may be useful some day, but currently we do not need to free */
 170 }
 171
 172 #endif
 173
 174 /* alloc shared memory pages */
 175 void *qemu_vmalloc(size_t size)
 176 {
 177 #if defined(USE_KQEMU)
 178     if (kqemu_allowed)
 179         return kqemu_vmalloc(size);
 180 #endif
 181 #ifdef _BSD
 182     return valloc(size);
 183 #else
 184     return memalign(4096, size);
 185 #endif
 186 }
 187
 188 void qemu_vfree(void *ptr)
 189 {
 190 #if defined(USE_KQEMU)
 191     if (kqemu_allowed)
 192         kqemu_vfree(ptr);
 193 #endif
 194     free(ptr);
 195 }
 196
 197 #endif
 198
 199 void *qemu_mallocz(size_t size)
 200 {
 201     void *ptr;
 202     ptr = qemu_malloc(size);
 203     if (!ptr)
 204         return NULL;
 205     memset(ptr, 0, size);
 206     return ptr;
 207 }
 208
 209 char *qemu_strdup(const char *str)
 210 {
 211     char *ptr;
 212     ptr = qemu_malloc(strlen(str) + 1);
 213     if (!ptr)
 214         return NULL;
 215     strcpy(ptr, str);
 216     return ptr;
 217 }
 218
 219 int qemu_create_pidfile(const char *filename)
 220 {
 221     char buffer[128];
 222     int len;
 223 #ifndef _WIN32
 224     int fd;
 225
 226     fd = open(filename, O_RDWR | O_CREAT, 0600);
 227     if (fd == -1)
 228         return -1;
 229
 230     if (lockf(fd, F_TLOCK, 0) == -1)
 231         return -1;
 232
 233     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 234     if (write(fd, buffer, len) != len)
 235         return -1;
 236 #else
 237     HANDLE file;
 238     DWORD flags;
 239     OVERLAPPED overlap;
 240     BOOL ret;
 241
 242     /* Open for writing with no sharing. */
 243     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 244                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 245
 246     if (file == INVALID_HANDLE_VALUE)
 247       return -1;
 248
 249     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 250     overlap.hEvent = 0;
 251     /* Lock 1 byte. */
 252     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 253     if (ret == 0)
 254       return -1;
 255
 256     /* Write PID to file. */
 257     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 258     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 259                       &overlap, NULL);
 260     if (ret == 0)
 261       return -1;
 262 #endif
 263     return 0;
 264 }
 265
 266 #ifdef _WIN32
 267
 268 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 269 #define _W32_FT_OFFSET (116444736000000000ULL)
 270
 271 int qemu_gettimeofday(qemu_timeval *tp)
 272 {
 273   union {
 274     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 275     FILETIME ft;
 276   }  _now;
 277
 278   if(tp)
 279     {
 280       GetSystemTimeAsFileTime (&_now.ft);
 281       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 282       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 283     }
 284   /* Always return 0 as per Open Group Base Specifications Issue 6.
 285      Do not set errno on error.  */
 286   return 0;
 287 }
 288 #endif /* _WIN32 */