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 HOST_BSD etc. */
  37 #include "config-host.h"
  38
  39 #ifdef _WIN32
  40 #include <windows.h>
  41 #elif defined(HOST_BSD)
  42 #include <stdlib.h>
  43 #else
  44 #include <malloc.h>
  45 #endif
  46
  47 #include "qemu-common.h"
  48 #include "sysemu.h"
  49 #include "qemu_socket.h"
  50
  51 #if defined(_WIN32)
  52 void *qemu_memalign(size_t alignment, size_t size)
  53 {
  54     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  55 }
  56
  57 void *qemu_vmalloc(size_t size)
  58 {
  59     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  60        has 64Kb granularity, but at least it guarantees us that the
  61        memory is page aligned. */
  62     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  63 }
  64
  65 void qemu_vfree(void *ptr)
  66 {
  67     VirtualFree(ptr, 0, MEM_RELEASE);
  68 }
  69
  70 #else
  71
  72 #if defined(USE_KQEMU)
  73
  74 #ifdef __OpenBSD__
  75 #include <sys/param.h>
  76 #include <sys/types.h>
  77 #include <sys/mount.h>
  78 #else
  79 #ifndef __FreeBSD__
  80 #include <sys/vfs.h>
  81 #endif
  82 #endif
  83
  84 #include <sys/mman.h>
  85 #include <fcntl.h>
  86
  87 static void *kqemu_vmalloc(size_t size)
  88 {
  89     static int phys_ram_fd = -1;
  90     static int phys_ram_size = 0;
  91     void *ptr;
  92
  93 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
  94 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
  95     int map_anon = MAP_ANON;
  96 #else
  97     int map_anon = 0;
  98     const char *tmpdir;
  99     char phys_ram_file[1024];
 100 #ifdef HOST_SOLARIS
 101     struct statvfs stfs;
 102 #else
 103     struct statfs stfs;
 104 #endif
 105
 106     if (phys_ram_fd < 0) {
 107         tmpdir = getenv("QEMU_TMPDIR");
 108         if (!tmpdir)
 109 #ifdef HOST_SOLARIS
 110             tmpdir = "/tmp";
 111         if (statvfs(tmpdir, &stfs) == 0) {
 112 #else
 113             tmpdir = "/dev/shm";
 114         if (statfs(tmpdir, &stfs) == 0) {
 115 #endif
 116             int64_t free_space;
 117             int ram_mb;
 118
 119             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 120             if ((ram_size + 8192 * 1024) >= free_space) {
 121                 ram_mb = (ram_size / (1024 * 1024));
 122                 fprintf(stderr,
 123                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 124                         tmpdir, ram_mb);
 125                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 126                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 127                             "mount -o remount,size=%dm /dev/shm\n",
 128                             ram_mb + 16);
 129                 } else {
 130                     fprintf(stderr,
 131                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 132                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 133                             "temporary RAM file will be opened.\n");
 134                 }
 135                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 136                 exit(1);
 137             }
 138         }
 139         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 140                  tmpdir);
 141         phys_ram_fd = mkstemp(phys_ram_file);
 142         if (phys_ram_fd < 0) {
 143             fprintf(stderr,
 144                     "warning: could not create temporary file in '%s'.\n"
 145                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 146                     "Using '/tmp' as fallback.\n",
 147                     tmpdir);
 148             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 149                      "/tmp");
 150             phys_ram_fd = mkstemp(phys_ram_file);
 151             if (phys_ram_fd < 0) {
 152                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 153                         phys_ram_file);
 154                 exit(1);
 155             }
 156         }
 157         unlink(phys_ram_file);
 158     }
 159     size = (size + 4095) & ~4095;
 160     ftruncate(phys_ram_fd, phys_ram_size + size);
 161 #endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
 162     ptr = mmap(NULL,
 163                size,
 164                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 165                phys_ram_fd, phys_ram_size);
 166     if (ptr == MAP_FAILED) {
 167         fprintf(stderr, "Could not map physical memory\n");
 168         exit(1);
 169     }
 170     phys_ram_size += size;
 171     return ptr;
 172 }
 173
 174 static void kqemu_vfree(void *ptr)
 175 {
 176     /* may be useful some day, but currently we do not need to free */
 177 }
 178
 179 #endif
 180
 181 void *qemu_memalign(size_t alignment, size_t size)
 182 {
 183 #if defined(_POSIX_C_SOURCE)
 184     int ret;
 185     void *ptr;
 186     ret = posix_memalign(&ptr, alignment, size);
 187     if (ret != 0)
 188         return NULL;
 189     return ptr;
 190 #elif defined(HOST_BSD)
 191     return valloc(size);
 192 #else
 193     return memalign(alignment, size);
 194 #endif
 195 }
 196
 197 /* alloc shared memory pages */
 198 void *qemu_vmalloc(size_t size)
 199 {
 200 #if defined(USE_KQEMU)
 201     if (kqemu_allowed)
 202         return kqemu_vmalloc(size);
 203 #endif
 204     return qemu_memalign(getpagesize(), size);
 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