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 /* FIXME: This file should be target independent. However it has kqemu
  37    hacks, so must be built for every target.  */
  38
  39 /* Needed early for HOST_BSD etc. */
  40 #include "config-host.h"
  41
  42 #ifdef _WIN32
  43 #include <windows.h>
  44 #elif defined(HOST_BSD)
  45 #include <stdlib.h>
  46 #else
  47 #include <malloc.h>
  48 #endif
  49
  50 #include "qemu-common.h"
  51 #include "sysemu.h"
  52 #include "qemu_socket.h"
  53
  54 #if defined(_WIN32)
  55 void *qemu_memalign(size_t alignment, size_t size)
  56 {
  57     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  58 }
  59
  60 void *qemu_vmalloc(size_t size)
  61 {
  62     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  63        has 64Kb granularity, but at least it guarantees us that the
  64        memory is page aligned. */
  65     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  66 }
  67
  68 void qemu_vfree(void *ptr)
  69 {
  70     VirtualFree(ptr, 0, MEM_RELEASE);
  71 }
  72
  73 #else
  74
  75 #if defined(CONFIG_KQEMU)
  76
  77 #ifdef __OpenBSD__
  78 #include <sys/param.h>
  79 #include <sys/types.h>
  80 #include <sys/mount.h>
  81 #else
  82 #ifndef __FreeBSD__
  83 #include <sys/vfs.h>
  84 #endif
  85 #endif
  86
  87 #include <sys/mman.h>
  88 #include <fcntl.h>
  89
  90 static void *kqemu_vmalloc(size_t size)
  91 {
  92     static int phys_ram_fd = -1;
  93     static int phys_ram_size = 0;
  94     void *ptr;
  95
  96 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
  97 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
  98     int map_anon = MAP_ANON;
  99 #else
 100     int map_anon = 0;
 101     const char *tmpdir;
 102     char phys_ram_file[1024];
 103 #ifdef HOST_SOLARIS
 104     struct statvfs stfs;
 105 #else
 106     struct statfs stfs;
 107 #endif
 108
 109     if (phys_ram_fd < 0) {
 110         tmpdir = getenv("QEMU_TMPDIR");
 111         if (!tmpdir)
 112 #ifdef HOST_SOLARIS
 113             tmpdir = "/tmp";
 114         if (statvfs(tmpdir, &stfs) == 0) {
 115 #else
 116             tmpdir = "/dev/shm";
 117         if (statfs(tmpdir, &stfs) == 0) {
 118 #endif
 119             int64_t free_space;
 120             int ram_mb;
 121
 122             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 123             if ((ram_size + 8192 * 1024) >= free_space) {
 124                 ram_mb = (ram_size / (1024 * 1024));
 125                 fprintf(stderr,
 126                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 127                         tmpdir, ram_mb);
 128                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 129                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 130                             "mount -o remount,size=%dm /dev/shm\n",
 131                             ram_mb + 16);
 132                 } else {
 133                     fprintf(stderr,
 134                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 135                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 136                             "temporary RAM file will be opened.\n");
 137                 }
 138                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 139                 exit(1);
 140             }
 141         }
 142         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 143                  tmpdir);
 144         phys_ram_fd = mkstemp(phys_ram_file);
 145         if (phys_ram_fd < 0) {
 146             fprintf(stderr,
 147                     "warning: could not create temporary file in '%s'.\n"
 148                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 149                     "Using '/tmp' as fallback.\n",
 150                     tmpdir);
 151             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 152                      "/tmp");
 153             phys_ram_fd = mkstemp(phys_ram_file);
 154             if (phys_ram_fd < 0) {
 155                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 156                         phys_ram_file);
 157                 exit(1);
 158             }
 159         }
 160         unlink(phys_ram_file);
 161     }
 162     size = (size + 4095) & ~4095;
 163     ftruncate(phys_ram_fd, phys_ram_size + size);
 164 #endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
 165     ptr = mmap(NULL,
 166                size,
 167                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 168                phys_ram_fd, phys_ram_size);
 169     if (ptr == MAP_FAILED) {
 170         fprintf(stderr, "Could not map physical memory\n");
 171         exit(1);
 172     }
 173     phys_ram_size += size;
 174     return ptr;
 175 }
 176
 177 static void kqemu_vfree(void *ptr)
 178 {
 179     /* may be useful some day, but currently we do not need to free */
 180 }
 181
 182 #endif
 183
 184 void *qemu_memalign(size_t alignment, size_t size)
 185 {
 186 #if defined(_POSIX_C_SOURCE)
 187     int ret;
 188     void *ptr;
 189     ret = posix_memalign(&ptr, alignment, size);
 190     if (ret != 0)
 191         return NULL;
 192     return ptr;
 193 #elif defined(HOST_BSD)
 194     return valloc(size);
 195 #else
 196     return memalign(alignment, size);
 197 #endif
 198 }
 199
 200 /* alloc shared memory pages */
 201 void *qemu_vmalloc(size_t size)
 202 {
 203 #if defined(CONFIG_KQEMU)
 204     if (kqemu_allowed)
 205         return kqemu_vmalloc(size);
 206 #endif
 207 #ifndef __ia64__
 208     return qemu_memalign(getpagesize(), size);
 209 #else
 210     return qemu_memalign(65536, size);
 211 #endif
 212 }
 213
 214 void qemu_vfree(void *ptr)
 215 {
 216 #if defined(CONFIG_KQEMU)
 217     if (kqemu_allowed)
 218         kqemu_vfree(ptr);
 219 #endif
 220     free(ptr);
 221 }
 222
 223 #endif
 224
 225 int qemu_create_pidfile(const char *filename)
 226 {
 227     char buffer[128];
 228     int len;
 229 #ifndef _WIN32
 230     int fd;
 231
 232     fd = open(filename, O_RDWR | O_CREAT, 0600);
 233     if (fd == -1)
 234         return -1;
 235
 236     if (lockf(fd, F_TLOCK, 0) == -1)
 237         return -1;
 238
 239     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 240     if (write(fd, buffer, len) != len)
 241         return -1;
 242 #else
 243     HANDLE file;
 244     DWORD flags;
 245     OVERLAPPED overlap;
 246     BOOL ret;
 247
 248     /* Open for writing with no sharing. */
 249     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 250                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 251
 252     if (file == INVALID_HANDLE_VALUE)
 253       return -1;
 254
 255     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 256     overlap.hEvent = 0;
 257     /* Lock 1 byte. */
 258     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 259     if (ret == 0)
 260       return -1;
 261
 262     /* Write PID to file. */
 263     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 264     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 265                       &overlap, NULL);
 266     if (ret == 0)
 267       return -1;
 268 #endif
 269     return 0;
 270 }
 271
 272 #ifdef _WIN32
 273
 274 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 275 #define _W32_FT_OFFSET (116444736000000000ULL)
 276
 277 int qemu_gettimeofday(qemu_timeval *tp)
 278 {
 279   union {
 280     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 281     FILETIME ft;
 282   }  _now;
 283
 284   if(tp)
 285     {
 286       GetSystemTimeAsFileTime (&_now.ft);
 287       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 288       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 289     }
 290   /* Always return 0 as per Open Group Base Specifications Issue 6.
 291      Do not set errno on error.  */
 292   return 0;
 293 }
 294 #endif /* _WIN32 */
 295
 296
 297 #ifdef _WIN32
 298 void socket_set_nonblock(int fd)
 299 {
 300     unsigned long opt = 1;
 301     ioctlsocket(fd, FIONBIO, &opt);
 302 }
 303
 304 int inet_aton(const char *cp, struct in_addr *ia)
 305 {
 306     uint32_t addr = inet_addr(cp);
 307     if (addr == 0xffffffff)
 308         return 0;
 309     ia->s_addr = addr;
 310     return 1;
 311 }
 312 #else
 313 void socket_set_nonblock(int fd)
 314 {
 315     int f;
 316     f = fcntl(fd, F_GETFL);
 317     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 318 }
 319 #endif