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