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