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 /* Needed early for CONFIG_BSD etc. */
  37 #include "config-host.h"
  38
  39 #ifdef _WIN32
  40 #include <windows.h>
  41 #elif defined(CONFIG_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(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
  52 static void *oom_check(void *ptr)
  53 {
  54     if (ptr == NULL) {
  55 #if defined(_WIN32)
  56         fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
  57 #else
  58         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
  59 #endif
  60         abort();
  61     }
  62     return ptr;
  63 }
  64 #endif
  65
  66 #if defined(_WIN32)
  67 void *qemu_memalign(size_t alignment, size_t size)
  68 {
  69     if (!size) {
  70         abort();
  71     }
  72     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  73 }
  74
  75 void *qemu_vmalloc(size_t size)
  76 {
  77     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  78        has 64Kb granularity, but at least it guarantees us that the
  79        memory is page aligned. */
  80     if (!size) {
  81         abort();
  82     }
  83     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  84 }
  85
  86 void qemu_vfree(void *ptr)
  87 {
  88     VirtualFree(ptr, 0, MEM_RELEASE);
  89 }
  90
  91 #else
  92
  93 void *qemu_memalign(size_t alignment, size_t size)
  94 {
  95 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
  96     int ret;
  97     void *ptr;
  98     ret = posix_memalign(&ptr, alignment, size);
  99     if (ret != 0) {
 100         fprintf(stderr, "Failed to allocate %zu B: %s\n",
 101                 size, strerror(ret));
 102         abort();
 103     }
 104     return ptr;
 105 #elif defined(CONFIG_BSD)
 106     return oom_check(valloc(size));
 107 #else
 108     return oom_check(memalign(alignment, size));
 109 #endif
 110 }
 111
 112 /* alloc shared memory pages */
 113 void *qemu_vmalloc(size_t size)
 114 {
 115 #ifndef __ia64__
 116     return qemu_memalign(getpagesize(), size);
 117 #else
 118     return qemu_memalign(65536, size);
 119 #endif
 120 }
 121
 122 void qemu_vfree(void *ptr)
 123 {
 124     free(ptr);
 125 }
 126
 127 #endif
 128
 129 int qemu_create_pidfile(const char *filename)
 130 {
 131     char buffer[128];
 132     int len;
 133 #ifndef _WIN32
 134     int fd;
 135
 136     fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
 137     if (fd == -1)
 138         return -1;
 139
 140     if (lockf(fd, F_TLOCK, 0) == -1)
 141         return -1;
 142
 143     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 144     if (write(fd, buffer, len) != len)
 145         return -1;
 146 #else
 147     HANDLE file;
 148     OVERLAPPED overlap;
 149     BOOL ret;
 150     memset(&overlap, 0, sizeof(overlap));
 151
 152     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 153                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 154
 155     if (file == INVALID_HANDLE_VALUE)
 156       return -1;
 157
 158     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 159     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 160                       &overlap, NULL);
 161     if (ret == 0)
 162       return -1;
 163 #endif
 164     return 0;
 165 }
 166
 167 #ifdef _WIN32
 168
 169 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 170 #define _W32_FT_OFFSET (116444736000000000ULL)
 171
 172 int qemu_gettimeofday(qemu_timeval *tp)
 173 {
 174   union {
 175     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 176     FILETIME ft;
 177   }  _now;
 178
 179   if(tp)
 180     {
 181       GetSystemTimeAsFileTime (&_now.ft);
 182       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 183       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 184     }
 185   /* Always return 0 as per Open Group Base Specifications Issue 6.
 186      Do not set errno on error.  */
 187   return 0;
 188 }
 189 #endif /* _WIN32 */
 190
 191
 192 #ifdef _WIN32
 193 void socket_set_nonblock(int fd)
 194 {
 195     unsigned long opt = 1;
 196     ioctlsocket(fd, FIONBIO, &opt);
 197 }
 198
 199 int inet_aton(const char *cp, struct in_addr *ia)
 200 {
 201     uint32_t addr = inet_addr(cp);
 202     if (addr == 0xffffffff)
 203         return 0;
 204     ia->s_addr = addr;
 205     return 1;
 206 }
 207
 208 void qemu_set_cloexec(int fd)
 209 {
 210 }
 211
 212 #else
 213
 214 void socket_set_nonblock(int fd)
 215 {
 216     int f;
 217     f = fcntl(fd, F_GETFL);
 218     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 219 }
 220
 221 void qemu_set_cloexec(int fd)
 222 {
 223     int f;
 224     f = fcntl(fd, F_GETFD);
 225     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
 226 }
 227
 228 #endif
 229
 230 /*
 231  * Opens a file with FD_CLOEXEC set
 232  */
 233 int qemu_open(const char *name, int flags, ...)
 234 {
 235     int ret;
 236     int mode = 0;
 237
 238     if (flags & O_CREAT) {
 239         va_list ap;
 240
 241         va_start(ap, flags);
 242         mode = va_arg(ap, int);
 243         va_end(ap);
 244     }
 245
 246 #ifdef O_CLOEXEC
 247     ret = open(name, flags | O_CLOEXEC, mode);
 248 #else
 249     ret = open(name, flags, mode);
 250     if (ret >= 0) {
 251         qemu_set_cloexec(ret);
 252     }
 253 #endif
 254
 255     return ret;
 256 }
 257
 258 /*
 259  * A variant of write(2) which handles partial write.
 260  *
 261  * Return the number of bytes transferred.
 262  * Set errno if fewer than `count' bytes are written.
 263  */
 264 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 265 {
 266     ssize_t ret = 0;
 267     ssize_t total = 0;
 268
 269     while (count) {
 270         ret = write(fd, buf, count);
 271         if (ret < 0) {
 272             if (errno == EINTR)
 273                 continue;
 274             break;
 275         }
 276
 277         count -= ret;
 278         buf += ret;
 279         total += ret;
 280     }
 281
 282     return total;
 283 }
 284
 285 #ifndef _WIN32
 286 /*
 287  * Creates a pipe with FD_CLOEXEC set on both file descriptors
 288  */
 289 int qemu_pipe(int pipefd[2])
 290 {
 291     int ret;
 292
 293 #ifdef CONFIG_PIPE2
 294     ret = pipe2(pipefd, O_CLOEXEC);
 295     if (ret != -1 || errno != ENOSYS) {
 296         return ret;
 297     }
 298 #endif
 299     ret = pipe(pipefd);
 300     if (ret == 0) {
 301         qemu_set_cloexec(pipefd[0]);
 302         qemu_set_cloexec(pipefd[1]);
 303     }
 304
 305     return ret;
 306 }
 307 #endif
 308
 309 /*
 310  * Opens a socket with FD_CLOEXEC set
 311  */
 312 int qemu_socket(int domain, int type, int protocol)
 313 {
 314     int ret;
 315
 316 #ifdef SOCK_CLOEXEC
 317     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
 318     if (ret != -1 || errno != EINVAL) {
 319         return ret;
 320     }
 321 #endif
 322     ret = socket(domain, type, protocol);
 323     if (ret >= 0) {
 324         qemu_set_cloexec(ret);
 325     }
 326
 327     return ret;
 328 }
 329
 330 /*
 331  * Accept a connection and set FD_CLOEXEC
 332  */
 333 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 334 {
 335     int ret;
 336
 337 #ifdef CONFIG_ACCEPT4
 338     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
 339     if (ret != -1 || errno != ENOSYS) {
 340         return ret;
 341     }
 342 #endif
 343     ret = accept(s, addr, addrlen);
 344     if (ret >= 0) {
 345         qemu_set_cloexec(ret);
 346     }
 347
 348     return ret;
 349 }