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
  32 /* Needed early for CONFIG_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifdef CONFIG_SOLARIS
  36 #include <sys/types.h>
  37 #include <sys/statvfs.h>
  38 #endif
  39
  40 #ifdef _WIN32
  41 #include <windows.h>
  42 #elif defined(CONFIG_BSD)
  43 #include <stdlib.h>
  44 #else
  45 #include <malloc.h>
  46 #endif
  47
  48 #include "qemu-common.h"
  49 #include "sysemu.h"
  50 #include "qemu_socket.h"
  51
  52 #if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
  53 static void *oom_check(void *ptr)
  54 {
  55     if (ptr == NULL) {
  56 #if defined(_WIN32)
  57         fprintf(stderr, "Failed to allocate memory: %lu\n", GetLastError());
  58 #else
  59         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
  60 #endif
  61         abort();
  62     }
  63     return ptr;
  64 }
  65 #endif
  66
  67 #if defined(_WIN32)
  68 void *qemu_memalign(size_t alignment, size_t size)
  69 {
  70     if (!size) {
  71         abort();
  72     }
  73     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  74 }
  75
  76 void *qemu_vmalloc(size_t size)
  77 {
  78     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  79        has 64Kb granularity, but at least it guarantees us that the
  80        memory is page aligned. */
  81     if (!size) {
  82         abort();
  83     }
  84     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  85 }
  86
  87 void qemu_vfree(void *ptr)
  88 {
  89     VirtualFree(ptr, 0, MEM_RELEASE);
  90 }
  91
  92 #else
  93
  94 void *qemu_memalign(size_t alignment, size_t size)
  95 {
  96 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
  97     int ret;
  98     void *ptr;
  99     ret = posix_memalign(&ptr, alignment, size);
 100     if (ret != 0) {
 101         fprintf(stderr, "Failed to allocate %zu B: %s\n",
 102                 size, strerror(ret));
 103         abort();
 104     }
 105     return ptr;
 106 #elif defined(CONFIG_BSD)
 107     return oom_check(valloc(size));
 108 #else
 109     return oom_check(memalign(alignment, size));
 110 #endif
 111 }
 112
 113 /* alloc shared memory pages */
 114 void *qemu_vmalloc(size_t size)
 115 {
 116     return qemu_memalign(getpagesize(), size);
 117 }
 118
 119 void qemu_vfree(void *ptr)
 120 {
 121     free(ptr);
 122 }
 123
 124 #endif
 125
 126 int qemu_create_pidfile(const char *filename)
 127 {
 128     char buffer[128];
 129     int len;
 130 #ifndef _WIN32
 131     int fd;
 132
 133     fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
 134     if (fd == -1)
 135         return -1;
 136
 137     if (lockf(fd, F_TLOCK, 0) == -1)
 138         return -1;
 139
 140     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 141     if (write(fd, buffer, len) != len)
 142         return -1;
 143 #else
 144     HANDLE file;
 145     OVERLAPPED overlap;
 146     BOOL ret;
 147     memset(&overlap, 0, sizeof(overlap));
 148
 149     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 150                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 151
 152     if (file == INVALID_HANDLE_VALUE)
 153       return -1;
 154
 155     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 156     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 157                       &overlap, NULL);
 158     if (ret == 0)
 159       return -1;
 160 #endif
 161     return 0;
 162 }
 163
 164 #ifdef _WIN32
 165
 166 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 167 #define _W32_FT_OFFSET (116444736000000000ULL)
 168
 169 int qemu_gettimeofday(qemu_timeval *tp)
 170 {
 171   union {
 172     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 173     FILETIME ft;
 174   }  _now;
 175
 176   if(tp)
 177     {
 178       GetSystemTimeAsFileTime (&_now.ft);
 179       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 180       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 181     }
 182   /* Always return 0 as per Open Group Base Specifications Issue 6.
 183      Do not set errno on error.  */
 184   return 0;
 185 }
 186 #endif /* _WIN32 */
 187
 188
 189 #ifdef _WIN32
 190 void socket_set_nonblock(int fd)
 191 {
 192     unsigned long opt = 1;
 193     ioctlsocket(fd, FIONBIO, &opt);
 194 }
 195
 196 int inet_aton(const char *cp, struct in_addr *ia)
 197 {
 198     uint32_t addr = inet_addr(cp);
 199     if (addr == 0xffffffff)
 200         return 0;
 201     ia->s_addr = addr;
 202     return 1;
 203 }
 204
 205 void qemu_set_cloexec(int fd)
 206 {
 207 }
 208
 209 #else
 210
 211 void socket_set_nonblock(int fd)
 212 {
 213     int f;
 214     f = fcntl(fd, F_GETFL);
 215     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 216 }
 217
 218 void qemu_set_cloexec(int fd)
 219 {
 220     int f;
 221     f = fcntl(fd, F_GETFD);
 222     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
 223 }
 224
 225 #endif
 226
 227 /*
 228  * Opens a file with FD_CLOEXEC set
 229  */
 230 int qemu_open(const char *name, int flags, ...)
 231 {
 232     int ret;
 233     int mode = 0;
 234
 235     if (flags & O_CREAT) {
 236         va_list ap;
 237
 238         va_start(ap, flags);
 239         mode = va_arg(ap, int);
 240         va_end(ap);
 241     }
 242
 243 #ifdef O_CLOEXEC
 244     ret = open(name, flags | O_CLOEXEC, mode);
 245 #else
 246     ret = open(name, flags, mode);
 247     if (ret >= 0) {
 248         qemu_set_cloexec(ret);
 249     }
 250 #endif
 251
 252     return ret;
 253 }
 254
 255 /*
 256  * A variant of write(2) which handles partial write.
 257  *
 258  * Return the number of bytes transferred.
 259  * Set errno if fewer than `count' bytes are written.
 260  */
 261 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 262 {
 263     ssize_t ret = 0;
 264     ssize_t total = 0;
 265
 266     while (count) {
 267         ret = write(fd, buf, count);
 268         if (ret < 0) {
 269             if (errno == EINTR)
 270                 continue;
 271             break;
 272         }
 273
 274         count -= ret;
 275         buf += ret;
 276         total += ret;
 277     }
 278
 279     return total;
 280 }
 281
 282 #ifndef _WIN32
 283 /*
 284  * Creates a pipe with FD_CLOEXEC set on both file descriptors
 285  */
 286 int qemu_pipe(int pipefd[2])
 287 {
 288     int ret;
 289
 290 #ifdef CONFIG_PIPE2
 291     ret = pipe2(pipefd, O_CLOEXEC);
 292     if (ret != -1 || errno != ENOSYS) {
 293         return ret;
 294     }
 295 #endif
 296     ret = pipe(pipefd);
 297     if (ret == 0) {
 298         qemu_set_cloexec(pipefd[0]);
 299         qemu_set_cloexec(pipefd[1]);
 300     }
 301
 302     return ret;
 303 }
 304 #endif
 305
 306 /*
 307  * Opens a socket with FD_CLOEXEC set
 308  */
 309 int qemu_socket(int domain, int type, int protocol)
 310 {
 311     int ret;
 312
 313 #ifdef SOCK_CLOEXEC
 314     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
 315     if (ret != -1 || errno != EINVAL) {
 316         return ret;
 317     }
 318 #endif
 319     ret = socket(domain, type, protocol);
 320     if (ret >= 0) {
 321         qemu_set_cloexec(ret);
 322     }
 323
 324     return ret;
 325 }
 326
 327 /*
 328  * Accept a connection and set FD_CLOEXEC
 329  */
 330 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 331 {
 332     int ret;
 333
 334 #ifdef CONFIG_ACCEPT4
 335     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
 336     if (ret != -1 || errno != ENOSYS) {
 337         return ret;
 338     }
 339 #endif
 340     ret = accept(s, addr, addrlen);
 341     if (ret >= 0) {
 342         qemu_set_cloexec(ret);
 343     }
 344
 345     return ret;
 346 }