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 /* Needed early for _BSD etc. */
  37 #include "config-host.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-common.h"
  49 #include "sysemu.h"
  50 #include "qemu_socket.h"
  51
  52 #if defined(_WIN32)
  53 void *qemu_memalign(size_t alignment, size_t size)
  54 {
  55     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  56 }
  57
  58 void *qemu_vmalloc(size_t size)
  59 {
  60     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  61        has 64Kb granularity, but at least it guarantees us that the
  62        memory is page aligned. */
  63     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  64 }
  65
  66 void qemu_vfree(void *ptr)
  67 {
  68     VirtualFree(ptr, 0, MEM_RELEASE);
  69 }
  70
  71 #else
  72
  73 #if defined(USE_KQEMU)
  74
  75 #ifdef __OpenBSD__
  76 #include <sys/param.h>
  77 #include <sys/types.h>
  78 #include <sys/mount.h>
  79 #else
  80 #ifndef __FreeBSD__
  81 #include <sys/vfs.h>
  82 #endif
  83 #endif
  84
  85 #include <sys/mman.h>
  86 #include <fcntl.h>
  87
  88 static void *kqemu_vmalloc(size_t size)
  89 {
  90     static int phys_ram_fd = -1;
  91     static int phys_ram_size = 0;
  92     void *ptr;
  93
  94 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
  95 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
  96     int map_anon = MAP_ANON;
  97 #else
  98     int map_anon = 0;
  99     const char *tmpdir;
 100     char phys_ram_file[1024];
 101 #ifdef HOST_SOLARIS
 102     struct statvfs stfs;
 103 #else
 104     struct statfs stfs;
 105 #endif
 106
 107     if (phys_ram_fd < 0) {
 108         tmpdir = getenv("QEMU_TMPDIR");
 109         if (!tmpdir)
 110 #ifdef HOST_SOLARIS
 111             tmpdir = "/tmp";
 112         if (statvfs(tmpdir, &stfs) == 0) {
 113 #else
 114             tmpdir = "/dev/shm";
 115         if (statfs(tmpdir, &stfs) == 0) {
 116 #endif
 117             int64_t free_space;
 118             int ram_mb;
 119
 120             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 121             if ((ram_size + 8192 * 1024) >= free_space) {
 122                 ram_mb = (ram_size / (1024 * 1024));
 123                 fprintf(stderr,
 124                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 125                         tmpdir, ram_mb);
 126                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 127                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 128                             "mount -o remount,size=%dm /dev/shm\n",
 129                             ram_mb + 16);
 130                 } else {
 131                     fprintf(stderr,
 132                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 133                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 134                             "temporary RAM file will be opened.\n");
 135                 }
 136                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 137                 exit(1);
 138             }
 139         }
 140         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 141                  tmpdir);
 142         phys_ram_fd = mkstemp(phys_ram_file);
 143         if (phys_ram_fd < 0) {
 144             fprintf(stderr,
 145                     "warning: could not create temporary file in '%s'.\n"
 146                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 147                     "Using '/tmp' as fallback.\n",
 148                     tmpdir);
 149             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 150                      "/tmp");
 151             phys_ram_fd = mkstemp(phys_ram_file);
 152             if (phys_ram_fd < 0) {
 153                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 154                         phys_ram_file);
 155                 exit(1);
 156             }
 157         }
 158         unlink(phys_ram_file);
 159     }
 160     size = (size + 4095) & ~4095;
 161     ftruncate(phys_ram_fd, phys_ram_size + size);
 162 #endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
 163     ptr = mmap(NULL,
 164                size,
 165                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 166                phys_ram_fd, phys_ram_size);
 167     if (ptr == MAP_FAILED) {
 168         fprintf(stderr, "Could not map physical memory\n");
 169         exit(1);
 170     }
 171     phys_ram_size += size;
 172     return ptr;
 173 }
 174
 175 static void kqemu_vfree(void *ptr)
 176 {
 177     /* may be useful some day, but currently we do not need to free */
 178 }
 179
 180 #endif
 181
 182 void *qemu_memalign(size_t alignment, size_t size)
 183 {
 184 #if defined(_POSIX_C_SOURCE)
 185     int ret;
 186     void *ptr;
 187     ret = posix_memalign(&ptr, alignment, size);
 188     if (ret != 0)
 189         return NULL;
 190     return ptr;
 191 #elif defined(_BSD)
 192     return valloc(size);
 193 #else
 194     return memalign(alignment, size);
 195 #endif
 196 }
 197
 198 /* alloc shared memory pages */
 199 void *qemu_vmalloc(size_t size)
 200 {
 201 #if defined(USE_KQEMU)
 202     if (kqemu_allowed)
 203         return kqemu_vmalloc(size);
 204 #endif
 205     return qemu_memalign(getpagesize(), size);
 206 }
 207
 208 void qemu_vfree(void *ptr)
 209 {
 210 #if defined(USE_KQEMU)
 211     if (kqemu_allowed)
 212         kqemu_vfree(ptr);
 213 #endif
 214     free(ptr);
 215 }
 216
 217 #endif
 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 */
 289
 290
 291 #ifdef _WIN32
 292 void socket_set_nonblock(int fd)
 293 {
 294     unsigned long opt = 1;
 295     ioctlsocket(fd, FIONBIO, &opt);
 296 }
 297
 298 int inet_aton(const char *cp, struct in_addr *ia)
 299 {
 300     uint32_t addr = inet_addr(cp);
 301     if (addr == 0xffffffff)
 302         return 0;
 303     ia->s_addr = addr;
 304     return 1;
 305 }
 306 #else
 307 void socket_set_nonblock(int fd)
 308 {
 309     int f;
 310     f = fcntl(fd, F_GETFL);
 311     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 312 }
 313 #endif