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     return qemu_memalign(getpagesize(), size);
 116 }
 117
 118 void qemu_vfree(void *ptr)
 119 {
 120     free(ptr);
 121 }
 122
 123 #endif
 124
 125 int qemu_create_pidfile(const char *filename)
 126 {
 127     char buffer[128];
 128     int len;
 129 #ifndef _WIN32
 130     int fd;
 131
 132     fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
 133     if (fd == -1)
 134         return -1;
 135
 136     if (lockf(fd, F_TLOCK, 0) == -1)
 137         return -1;
 138
 139     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 140     if (write(fd, buffer, len) != len)
 141         return -1;
 142 #else
 143     HANDLE file;
 144     OVERLAPPED overlap;
 145     BOOL ret;
 146     memset(&overlap, 0, sizeof(overlap));
 147
 148     file = CreateFile(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL,
 149                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 150
 151     if (file == INVALID_HANDLE_VALUE)
 152       return -1;
 153
 154     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 155     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 156                       &overlap, NULL);
 157     if (ret == 0)
 158       return -1;
 159 #endif
 160     return 0;
 161 }
 162
 163 #ifdef _WIN32
 164
 165 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 166 #define _W32_FT_OFFSET (116444736000000000ULL)
 167
 168 int qemu_gettimeofday(qemu_timeval *tp)
 169 {
 170   union {
 171     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 172     FILETIME ft;
 173   }  _now;
 174
 175   if(tp)
 176     {
 177       GetSystemTimeAsFileTime (&_now.ft);
 178       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 179       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 180     }
 181   /* Always return 0 as per Open Group Base Specifications Issue 6.
 182      Do not set errno on error.  */
 183   return 0;
 184 }
 185 #endif /* _WIN32 */
 186
 187
 188 #ifdef _WIN32
 189 void socket_set_nonblock(int fd)
 190 {
 191     unsigned long opt = 1;
 192     ioctlsocket(fd, FIONBIO, &opt);
 193 }
 194
 195 int inet_aton(const char *cp, struct in_addr *ia)
 196 {
 197     uint32_t addr = inet_addr(cp);
 198     if (addr == 0xffffffff)
 199         return 0;
 200     ia->s_addr = addr;
 201     return 1;
 202 }
 203
 204 void qemu_set_cloexec(int fd)
 205 {
 206 }
 207
 208 #else
 209
 210 void socket_set_nonblock(int fd)
 211 {
 212     int f;
 213     f = fcntl(fd, F_GETFL);
 214     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 215 }
 216
 217 void qemu_set_cloexec(int fd)
 218 {
 219     int f;
 220     f = fcntl(fd, F_GETFD);
 221     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
 222 }
 223
 224 #endif
 225
 226 /*
 227  * Opens a file with FD_CLOEXEC set
 228  */
 229 int qemu_open(const char *name, int flags, ...)
 230 {
 231     int ret;
 232     int mode = 0;
 233
 234     if (flags & O_CREAT) {
 235         va_list ap;
 236
 237         va_start(ap, flags);
 238         mode = va_arg(ap, int);
 239         va_end(ap);
 240     }
 241
 242 #ifdef O_CLOEXEC
 243     ret = open(name, flags | O_CLOEXEC, mode);
 244 #else
 245     ret = open(name, flags, mode);
 246     if (ret >= 0) {
 247         qemu_set_cloexec(ret);
 248     }
 249 #endif
 250
 251     return ret;
 252 }
 253
 254 /*
 255  * A variant of write(2) which handles partial write.
 256  *
 257  * Return the number of bytes transferred.
 258  * Set errno if fewer than `count' bytes are written.
 259  */
 260 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 261 {
 262     ssize_t ret = 0;
 263     ssize_t total = 0;
 264
 265     while (count) {
 266         ret = write(fd, buf, count);
 267         if (ret < 0) {
 268             if (errno == EINTR)
 269                 continue;
 270             break;
 271         }
 272
 273         count -= ret;
 274         buf += ret;
 275         total += ret;
 276     }
 277
 278     return total;
 279 }
 280
 281 #ifndef _WIN32
 282 /*
 283  * Creates a pipe with FD_CLOEXEC set on both file descriptors
 284  */
 285 int qemu_pipe(int pipefd[2])
 286 {
 287     int ret;
 288
 289 #ifdef CONFIG_PIPE2
 290     ret = pipe2(pipefd, O_CLOEXEC);
 291     if (ret != -1 || errno != ENOSYS) {
 292         return ret;
 293     }
 294 #endif
 295     ret = pipe(pipefd);
 296     if (ret == 0) {
 297         qemu_set_cloexec(pipefd[0]);
 298         qemu_set_cloexec(pipefd[1]);
 299     }
 300
 301     return ret;
 302 }
 303 #endif
 304
 305 /*
 306  * Opens a socket with FD_CLOEXEC set
 307  */
 308 int qemu_socket(int domain, int type, int protocol)
 309 {
 310     int ret;
 311
 312 #ifdef SOCK_CLOEXEC
 313     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
 314     if (ret != -1 || errno != EINVAL) {
 315         return ret;
 316     }
 317 #endif
 318     ret = socket(domain, type, protocol);
 319     if (ret >= 0) {
 320         qemu_set_cloexec(ret);
 321     }
 322
 323     return ret;
 324 }
 325
 326 /*
 327  * Accept a connection and set FD_CLOEXEC
 328  */
 329 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 330 {
 331     int ret;
 332
 333 #ifdef CONFIG_ACCEPT4
 334     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
 335     if (ret != -1 || errno != ENOSYS) {
 336         return ret;
 337     }
 338 #endif
 339     ret = accept(s, addr, addrlen);
 340     if (ret >= 0) {
 341         qemu_set_cloexec(ret);
 342     }
 343
 344     return ret;
 345 }