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 void *get_mmap_addr(unsigned long size)
  49 {
  50     return NULL;
  51 }
  52
  53 void qemu_free(void *ptr)
  54 {
  55     free(ptr);
  56 }
  57
  58 void *qemu_malloc(size_t size)
  59 {
  60     return malloc(size);
  61 }
  62
  63 #if defined(_WIN32)
  64
  65 void *qemu_vmalloc(size_t size)
  66 {
  67     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  68        has 64Kb granularity, but at least it guarantees us that the
  69        memory is page aligned. */
  70     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  71 }
  72
  73 void qemu_vfree(void *ptr)
  74 {
  75     VirtualFree(ptr, 0, MEM_RELEASE);
  76 }
  77
  78 #else
  79
  80 #if defined(USE_KQEMU)
  81
  82 #include <sys/vfs.h>
  83 #include <sys/mman.h>
  84 #include <fcntl.h>
  85
  86 static void *kqemu_vmalloc(size_t size)
  87 {
  88     static int phys_ram_fd = -1;
  89     static int phys_ram_size = 0;
  90     const char *tmpdir;
  91     char phys_ram_file[1024];
  92     void *ptr;
  93 #ifdef HOST_SOLARIS
  94     struct statvfs stfs;
  95 #else
  96     struct statfs stfs;
  97 #endif
  98
  99     if (phys_ram_fd < 0) {
 100         tmpdir = getenv("QEMU_TMPDIR");
 101         if (!tmpdir)
 102 #ifdef HOST_SOLARIS
 103             tmpdir = "/tmp";
 104         if (statvfs(tmpdir, &stfs) == 0) {
 105 #else
 106             tmpdir = "/dev/shm";
 107         if (statfs(tmpdir, &stfs) == 0) {
 108 #endif
 109             int64_t free_space;
 110             int ram_mb;
 111
 112             extern int ram_size;
 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                             "umount /dev/shm\n"
 122                             "mount -t tmpfs -o size=%dm none /dev/shm\n",
 123                             ram_mb + 16);
 124                 } else {
 125                     fprintf(stderr,
 126                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 127                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 128                             "temporary RAM file will be opened.\n");
 129                 }
 130                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 131                 exit(1);
 132             }
 133         }
 134         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 135                  tmpdir);
 136         phys_ram_fd = mkstemp(phys_ram_file);
 137         if (phys_ram_fd < 0) {
 138             fprintf(stderr,
 139                     "warning: could not create temporary file in '%s'.\n"
 140                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 141                     "Using '/tmp' as fallback.\n",
 142                     tmpdir);
 143             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 144                      "/tmp");
 145             phys_ram_fd = mkstemp(phys_ram_file);
 146             if (phys_ram_fd < 0) {
 147                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 148                         phys_ram_file);
 149                 exit(1);
 150             }
 151         }
 152         unlink(phys_ram_file);
 153     }
 154     size = (size + 4095) & ~4095;
 155     ftruncate(phys_ram_fd, phys_ram_size + size);
 156     ptr = mmap(NULL,
 157                size,
 158                PROT_WRITE | PROT_READ, 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 /* alloc shared memory pages */
 176 void *qemu_vmalloc(size_t size)
 177 {
 178 #if defined(USE_KQEMU)
 179     if (kqemu_allowed)
 180         return kqemu_vmalloc(size);
 181 #endif
 182 #ifdef _BSD
 183     return valloc(size);
 184 #else
 185     return memalign(4096, size);
 186 #endif
 187 }
 188
 189 void qemu_vfree(void *ptr)
 190 {
 191 #if defined(USE_KQEMU)
 192     if (kqemu_allowed)
 193         kqemu_vfree(ptr);
 194 #endif
 195     free(ptr);
 196 }
 197
 198 #endif
 199
 200 void *qemu_mallocz(size_t size)
 201 {
 202     void *ptr;
 203     ptr = qemu_malloc(size);
 204     if (!ptr)
 205         return NULL;
 206     memset(ptr, 0, size);
 207     return ptr;
 208 }
 209
 210 char *qemu_strdup(const char *str)
 211 {
 212     char *ptr;
 213     ptr = qemu_malloc(strlen(str) + 1);
 214     if (!ptr)
 215         return NULL;
 216     strcpy(ptr, str);
 217     return ptr;
 218 }
 219
 220 int qemu_create_pidfile(const char *filename)
 221 {
 222     char buffer[128];
 223     int len;
 224 #ifndef _WIN32
 225     int fd;
 226
 227     fd = open(filename, O_RDWR | O_CREAT, 0600);
 228     if (fd == -1)
 229         return -1;
 230
 231     if (lockf(fd, F_TLOCK, 0) == -1)
 232         return -1;
 233
 234     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 235     if (write(fd, buffer, len) != len)
 236         return -1;
 237 #else
 238     HANDLE file;
 239     DWORD flags;
 240     OVERLAPPED overlap;
 241     BOOL ret;
 242
 243     /* Open for writing with no sharing. */
 244     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 245                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 246
 247     if (file == INVALID_HANDLE_VALUE)
 248       return -1;
 249
 250     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 251     overlap.hEvent = 0;
 252     /* Lock 1 byte. */
 253     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 254     if (ret == 0)
 255       return -1;
 256
 257     /* Write PID to file. */
 258     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 259     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 260                       &overlap, NULL);
 261     if (ret == 0)
 262       return -1;
 263 #endif
 264     return 0;
 265 }
 266
 267 #ifdef _WIN32
 268
 269 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 270 #define _W32_FT_OFFSET (116444736000000000ULL)
 271
 272 int qemu_gettimeofday(qemu_timeval *tp)
 273 {
 274   union {
 275     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 276     FILETIME ft;
 277   }  _now;
 278
 279   if(tp)
 280     {
 281       GetSystemTimeAsFileTime (&_now.ft);
 282       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 283       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 284     }
 285   /* Always return 0 as per Open Group Base Specifications Issue 6.
 286      Do not set errno on error.  */
 287   return 0;
 288 }
 289 #endif /* _WIN32 */