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 CONFIG_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 CONFIG_BSD etc. */
  40 #include "config-host.h"
  41
  42 #ifdef _WIN32
  43 #include <windows.h>
  44 #elif defined(CONFIG_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(_POSIX_C_SOURCE) || defined(_WIN32)
  55 static void *oom_check(void *ptr)
  56 {
  57     if (ptr == NULL) {
  58         abort();
  59     }
  60     return ptr;
  61 }
  62 #endif
  63
  64 #if defined(_WIN32)
  65 void *qemu_memalign(size_t alignment, size_t size)
  66 {
  67     if (!size) {
  68         abort();
  69     }
  70     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  71 }
  72
  73 void *qemu_vmalloc(size_t size)
  74 {
  75     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  76        has 64Kb granularity, but at least it guarantees us that the
  77        memory is page aligned. */
  78     if (!size) {
  79         abort();
  80     }
  81     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  82 }
  83
  84 void qemu_vfree(void *ptr)
  85 {
  86     VirtualFree(ptr, 0, MEM_RELEASE);
  87 }
  88
  89 #else
  90
  91 #if defined(CONFIG_KQEMU)
  92
  93 #ifdef __OpenBSD__
  94 #include <sys/param.h>
  95 #include <sys/types.h>
  96 #include <sys/mount.h>
  97 #else
  98 #ifndef __FreeBSD__
  99 #include <sys/vfs.h>
 100 #endif
 101 #endif
 102
 103 #include <sys/mman.h>
 104 #include <fcntl.h>
 105
 106 static void *kqemu_vmalloc(size_t size)
 107 {
 108     static int phys_ram_fd = -1;
 109     static int phys_ram_size = 0;
 110     void *ptr;
 111
 112 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
 113 #if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 114     int map_anon = MAP_ANON;
 115 #else
 116     int map_anon = 0;
 117     const char *tmpdir;
 118     char phys_ram_file[1024];
 119 #ifdef CONFIG_SOLARIS
 120     struct statvfs stfs;
 121 #else
 122     struct statfs stfs;
 123 #endif
 124
 125     if (!size) {
 126         abort ();
 127     }
 128
 129     if (phys_ram_fd < 0) {
 130         tmpdir = getenv("QEMU_TMPDIR");
 131         if (!tmpdir)
 132 #ifdef CONFIG_SOLARIS
 133             tmpdir = "/tmp";
 134         if (statvfs(tmpdir, &stfs) == 0) {
 135 #else
 136             tmpdir = "/dev/shm";
 137         if (statfs(tmpdir, &stfs) == 0) {
 138 #endif
 139             int64_t free_space;
 140             int ram_mb;
 141
 142             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 143             if ((ram_size + 8192 * 1024) >= free_space) {
 144                 ram_mb = (ram_size / (1024 * 1024));
 145                 fprintf(stderr,
 146                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 147                         tmpdir, ram_mb);
 148                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 149                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 150                             "mount -o remount,size=%dm /dev/shm\n",
 151                             ram_mb + 16);
 152                 } else {
 153                     fprintf(stderr,
 154                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 155                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 156                             "temporary RAM file will be opened.\n");
 157                 }
 158                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 159                 exit(1);
 160             }
 161         }
 162         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 163                  tmpdir);
 164         phys_ram_fd = mkstemp(phys_ram_file);
 165         if (phys_ram_fd < 0) {
 166             fprintf(stderr,
 167                     "warning: could not create temporary file in '%s'.\n"
 168                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 169                     "Using '/tmp' as fallback.\n",
 170                     tmpdir);
 171             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 172                      "/tmp");
 173             phys_ram_fd = mkstemp(phys_ram_file);
 174             if (phys_ram_fd < 0) {
 175                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 176                         phys_ram_file);
 177                 exit(1);
 178             }
 179         }
 180         unlink(phys_ram_file);
 181     }
 182     size = (size + 4095) & ~4095;
 183     ftruncate(phys_ram_fd, phys_ram_size + size);
 184 #endif /* !(__OpenBSD__ || __FreeBSD__ || __DragonFly__) */
 185     ptr = mmap(NULL,
 186                size,
 187                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 188                phys_ram_fd, phys_ram_size);
 189     if (ptr == MAP_FAILED) {
 190         fprintf(stderr, "Could not map physical memory\n");
 191         exit(1);
 192     }
 193     phys_ram_size += size;
 194     return ptr;
 195 }
 196
 197 static void kqemu_vfree(void *ptr)
 198 {
 199     /* may be useful some day, but currently we do not need to free */
 200 }
 201
 202 #endif
 203
 204 void *qemu_memalign(size_t alignment, size_t size)
 205 {
 206 #if defined(_POSIX_C_SOURCE)
 207     int ret;
 208     void *ptr;
 209     ret = posix_memalign(&ptr, alignment, size);
 210     if (ret != 0)
 211         abort();
 212     return ptr;
 213 #elif defined(CONFIG_BSD)
 214     return oom_check(valloc(size));
 215 #else
 216     return oom_check(memalign(alignment, size));
 217 #endif
 218 }
 219
 220 /* alloc shared memory pages */
 221 void *qemu_vmalloc(size_t size)
 222 {
 223 #if defined(CONFIG_KQEMU)
 224     if (kqemu_allowed)
 225         return kqemu_vmalloc(size);
 226 #endif
 227     return qemu_memalign(getpagesize(), size);
 228 }
 229
 230 void qemu_vfree(void *ptr)
 231 {
 232 #if defined(CONFIG_KQEMU)
 233     if (kqemu_allowed)
 234         kqemu_vfree(ptr);
 235 #endif
 236     free(ptr);
 237 }
 238
 239 #endif
 240
 241 int qemu_create_pidfile(const char *filename)
 242 {
 243     char buffer[128];
 244     int len;
 245 #ifndef _WIN32
 246     int fd;
 247
 248     fd = open(filename, O_RDWR | O_CREAT, 0600);
 249     if (fd == -1)
 250         return -1;
 251
 252     if (lockf(fd, F_TLOCK, 0) == -1)
 253         return -1;
 254
 255     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 256     if (write(fd, buffer, len) != len)
 257         return -1;
 258 #else
 259     HANDLE file;
 260     DWORD flags;
 261     OVERLAPPED overlap;
 262     BOOL ret;
 263
 264     /* Open for writing with no sharing. */
 265     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 266                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 267
 268     if (file == INVALID_HANDLE_VALUE)
 269       return -1;
 270
 271     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 272     overlap.hEvent = 0;
 273     /* Lock 1 byte. */
 274     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 275     if (ret == 0)
 276       return -1;
 277
 278     /* Write PID to file. */
 279     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 280     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 281                       &overlap, NULL);
 282     if (ret == 0)
 283       return -1;
 284 #endif
 285     return 0;
 286 }
 287
 288 #ifdef _WIN32
 289
 290 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 291 #define _W32_FT_OFFSET (116444736000000000ULL)
 292
 293 int qemu_gettimeofday(qemu_timeval *tp)
 294 {
 295   union {
 296     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 297     FILETIME ft;
 298   }  _now;
 299
 300   if(tp)
 301     {
 302       GetSystemTimeAsFileTime (&_now.ft);
 303       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 304       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 305     }
 306   /* Always return 0 as per Open Group Base Specifications Issue 6.
 307      Do not set errno on error.  */
 308   return 0;
 309 }
 310 #endif /* _WIN32 */
 311
 312
 313 #ifdef _WIN32
 314 void socket_set_nonblock(int fd)
 315 {
 316     unsigned long opt = 1;
 317     ioctlsocket(fd, FIONBIO, &opt);
 318 }
 319
 320 int inet_aton(const char *cp, struct in_addr *ia)
 321 {
 322     uint32_t addr = inet_addr(cp);
 323     if (addr == 0xffffffff)
 324         return 0;
 325     ia->s_addr = addr;
 326     return 1;
 327 }
 328 #else
 329 void socket_set_nonblock(int fd)
 330 {
 331     int f;
 332     f = fcntl(fd, F_GETFL);
 333     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 334 }
 335 #endif