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 #ifdef _WIN32
  37 #define WIN32_LEAN_AND_MEAN
  38 #include <windows.h>
  39 #elif defined(_BSD)
  40 #include <stdlib.h>
  41 #else
  42 #include <malloc.h>
  43 #endif
  44
  45 #include "qemu-common.h"
  46 #include "sysemu.h"
  47 #include "qemu_socket.h"
  48
  49 #if defined(_WIN32)
  50 void *qemu_memalign(size_t alignment, size_t size)
  51 {
  52     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  53 }
  54
  55 void *qemu_vmalloc(size_t size)
  56 {
  57     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  58        has 64Kb granularity, but at least it guarantees us that the
  59        memory is page aligned. */
  60     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  61 }
  62
  63 void qemu_vfree(void *ptr)
  64 {
  65     VirtualFree(ptr, 0, MEM_RELEASE);
  66 }
  67
  68 #else
  69
  70 #if defined(USE_KQEMU)
  71
  72 #ifdef __OpenBSD__
  73 #include <sys/param.h>
  74 #include <sys/types.h>
  75 #include <sys/mount.h>
  76 #else
  77 #ifndef __FreeBSD__
  78 #include <sys/vfs.h>
  79 #endif
  80 #endif
  81
  82 #include <sys/mman.h>
  83 #include <fcntl.h>
  84
  85 static void *kqemu_vmalloc(size_t size)
  86 {
  87     static int phys_ram_fd = -1;
  88     static int phys_ram_size = 0;
  89     void *ptr;
  90
  91 /* no need (?) for a dummy file on OpenBSD/FreeBSD */
  92 #if defined(__OpenBSD__) || defined(__FreeBSD__)
  93     int map_anon = MAP_ANON;
  94 #else
  95     int map_anon = 0;
  96     const char *tmpdir;
  97     char phys_ram_file[1024];
  98 #ifdef HOST_SOLARIS
  99     struct statvfs stfs;
 100 #else
 101     struct statfs stfs;
 102 #endif
 103
 104     if (phys_ram_fd < 0) {
 105         tmpdir = getenv("QEMU_TMPDIR");
 106         if (!tmpdir)
 107 #ifdef HOST_SOLARIS
 108             tmpdir = "/tmp";
 109         if (statvfs(tmpdir, &stfs) == 0) {
 110 #else
 111             tmpdir = "/dev/shm";
 112         if (statfs(tmpdir, &stfs) == 0) {
 113 #endif
 114             int64_t free_space;
 115             int ram_mb;
 116
 117             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
 118             if ((ram_size + 8192 * 1024) >= free_space) {
 119                 ram_mb = (ram_size / (1024 * 1024));
 120                 fprintf(stderr,
 121                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
 122                         tmpdir, ram_mb);
 123                 if (strcmp(tmpdir, "/dev/shm") == 0) {
 124                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
 125                             "mount -o remount,size=%dm /dev/shm\n",
 126                             ram_mb + 16);
 127                 } else {
 128                     fprintf(stderr,
 129                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
 130                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
 131                             "temporary RAM file will be opened.\n");
 132                 }
 133                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
 134                 exit(1);
 135             }
 136         }
 137         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 138                  tmpdir);
 139         phys_ram_fd = mkstemp(phys_ram_file);
 140         if (phys_ram_fd < 0) {
 141             fprintf(stderr,
 142                     "warning: could not create temporary file in '%s'.\n"
 143                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
 144                     "Using '/tmp' as fallback.\n",
 145                     tmpdir);
 146             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
 147                      "/tmp");
 148             phys_ram_fd = mkstemp(phys_ram_file);
 149             if (phys_ram_fd < 0) {
 150                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
 151                         phys_ram_file);
 152                 exit(1);
 153             }
 154         }
 155         unlink(phys_ram_file);
 156     }
 157     size = (size + 4095) & ~4095;
 158     ftruncate(phys_ram_fd, phys_ram_size + size);
 159 #endif /* !(__OpenBSD__ || __FreeBSD__) */
 160     ptr = mmap(NULL,
 161                size,
 162                PROT_WRITE | PROT_READ, map_anon | MAP_SHARED,
 163                phys_ram_fd, phys_ram_size);
 164     if (ptr == MAP_FAILED) {
 165         fprintf(stderr, "Could not map physical memory\n");
 166         exit(1);
 167     }
 168     phys_ram_size += size;
 169     return ptr;
 170 }
 171
 172 static void kqemu_vfree(void *ptr)
 173 {
 174     /* may be useful some day, but currently we do not need to free */
 175 }
 176
 177 #endif
 178
 179 void *qemu_memalign(size_t alignment, size_t size)
 180 {
 181 #if defined(_POSIX_C_SOURCE)
 182     int ret;
 183     void *ptr;
 184     ret = posix_memalign(&ptr, alignment, size);
 185     if (ret != 0)
 186         return NULL;
 187     return ptr;
 188 #elif defined(_BSD)
 189     return valloc(size);
 190 #else
 191     return memalign(alignment, size);
 192 #endif
 193 }
 194
 195 /* alloc shared memory pages */
 196 void *qemu_vmalloc(size_t size)
 197 {
 198 #if defined(USE_KQEMU)
 199     if (kqemu_allowed)
 200         return kqemu_vmalloc(size);
 201 #endif
 202     return qemu_memalign(getpagesize(), size);
 203 }
 204
 205 void qemu_vfree(void *ptr)
 206 {
 207 #if defined(USE_KQEMU)
 208     if (kqemu_allowed)
 209         kqemu_vfree(ptr);
 210 #endif
 211     free(ptr);
 212 }
 213
 214 #endif
 215
 216 int qemu_create_pidfile(const char *filename)
 217 {
 218     char buffer[128];
 219     int len;
 220 #ifndef _WIN32
 221     int fd;
 222
 223     fd = open(filename, O_RDWR | O_CREAT, 0600);
 224     if (fd == -1)
 225         return -1;
 226
 227     if (lockf(fd, F_TLOCK, 0) == -1)
 228         return -1;
 229
 230     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 231     if (write(fd, buffer, len) != len)
 232         return -1;
 233 #else
 234     HANDLE file;
 235     DWORD flags;
 236     OVERLAPPED overlap;
 237     BOOL ret;
 238
 239     /* Open for writing with no sharing. */
 240     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 241                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 242
 243     if (file == INVALID_HANDLE_VALUE)
 244       return -1;
 245
 246     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 247     overlap.hEvent = 0;
 248     /* Lock 1 byte. */
 249     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 250     if (ret == 0)
 251       return -1;
 252
 253     /* Write PID to file. */
 254     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 255     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 256                       &overlap, NULL);
 257     if (ret == 0)
 258       return -1;
 259 #endif
 260     return 0;
 261 }
 262
 263 #ifdef _WIN32
 264
 265 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 266 #define _W32_FT_OFFSET (116444736000000000ULL)
 267
 268 int qemu_gettimeofday(qemu_timeval *tp)
 269 {
 270   union {
 271     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 272     FILETIME ft;
 273   }  _now;
 274
 275   if(tp)
 276     {
 277       GetSystemTimeAsFileTime (&_now.ft);
 278       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 279       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 280     }
 281   /* Always return 0 as per Open Group Base Specifications Issue 6.
 282      Do not set errno on error.  */
 283   return 0;
 284 }
 285 #endif /* _WIN32 */
 286
 287
 288 #ifdef _WIN32
 289 void socket_set_nonblock(int fd)
 290 {
 291     unsigned long opt = 1;
 292     ioctlsocket(fd, FIONBIO, &opt);
 293 }
 294
 295 int inet_aton(const char *cp, struct in_addr *ia)
 296 {
 297     uint32_t addr = inet_addr(cp);
 298     if (addr == 0xffffffff)
 299         return 0;
 300     ia->s_addr = addr;
 301     return 1;
 302 }
 303 #else
 304 void socket_set_nonblock(int fd)
 305 {
 306     int f;
 307     f = fcntl(fd, F_GETFL);
 308     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 309 }
 310 #endif