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         abort();
  56     }
  57     return ptr;
  58 }
  59 #endif
  60
  61 #if defined(_WIN32)
  62 void *qemu_memalign(size_t alignment, size_t size)
  63 {
  64     if (!size) {
  65         abort();
  66     }
  67     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  68 }
  69
  70 void *qemu_vmalloc(size_t size)
  71 {
  72     /* FIXME: this is not exactly optimal solution since VirtualAlloc
  73        has 64Kb granularity, but at least it guarantees us that the
  74        memory is page aligned. */
  75     if (!size) {
  76         abort();
  77     }
  78     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
  79 }
  80
  81 void qemu_vfree(void *ptr)
  82 {
  83     VirtualFree(ptr, 0, MEM_RELEASE);
  84 }
  85
  86 #else
  87
  88 void *qemu_memalign(size_t alignment, size_t size)
  89 {
  90 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
  91     int ret;
  92     void *ptr;
  93     ret = posix_memalign(&ptr, alignment, size);
  94     if (ret != 0)
  95         abort();
  96     return ptr;
  97 #elif defined(CONFIG_BSD)
  98     return oom_check(valloc(size));
  99 #else
 100     return oom_check(memalign(alignment, size));
 101 #endif
 102 }
 103
 104 /* alloc shared memory pages */
 105 void *qemu_vmalloc(size_t size)
 106 {
 107     return qemu_memalign(getpagesize(), size);
 108 }
 109
 110 void qemu_vfree(void *ptr)
 111 {
 112     free(ptr);
 113 }
 114
 115 #endif
 116
 117 int qemu_create_pidfile(const char *filename)
 118 {
 119     char buffer[128];
 120     int len;
 121 #ifndef _WIN32
 122     int fd;
 123
 124     fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
 125     if (fd == -1)
 126         return -1;
 127
 128     if (lockf(fd, F_TLOCK, 0) == -1)
 129         return -1;
 130
 131     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 132     if (write(fd, buffer, len) != len)
 133         return -1;
 134 #else
 135     HANDLE file;
 136     DWORD flags;
 137     OVERLAPPED overlap;
 138     BOOL ret;
 139
 140     /* Open for writing with no sharing. */
 141     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 142                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 143
 144     if (file == INVALID_HANDLE_VALUE)
 145       return -1;
 146
 147     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 148     overlap.hEvent = 0;
 149     /* Lock 1 byte. */
 150     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 151     if (ret == 0)
 152       return -1;
 153
 154     /* Write PID to file. */
 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 #ifndef _WIN32
 256 /*
 257  * Creates a pipe with FD_CLOEXEC set on both file descriptors
 258  */
 259 int qemu_pipe(int pipefd[2])
 260 {
 261     int ret;
 262
 263 #ifdef CONFIG_PIPE2
 264     ret = pipe2(pipefd, O_CLOEXEC);
 265     if (ret != -1 || errno != ENOSYS) {
 266         return ret;
 267     }
 268 #endif
 269     ret = pipe(pipefd);
 270     if (ret == 0) {
 271         qemu_set_cloexec(pipefd[0]);
 272         qemu_set_cloexec(pipefd[1]);
 273     }
 274
 275     return ret;
 276 }
 277 #endif
 278
 279 /*
 280  * Opens a socket with FD_CLOEXEC set
 281  */
 282 int qemu_socket(int domain, int type, int protocol)
 283 {
 284     int ret;
 285
 286 #ifdef SOCK_CLOEXEC
 287     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
 288     if (ret != -1 || errno != EINVAL) {
 289         return ret;
 290     }
 291 #endif
 292     ret = socket(domain, type, protocol);
 293     if (ret >= 0) {
 294         qemu_set_cloexec(ret);
 295     }
 296
 297     return ret;
 298 }
 299
 300 /*
 301  * Accept a connection and set FD_CLOEXEC
 302  */
 303 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 304 {
 305     int ret;
 306
 307 #ifdef CONFIG_ACCEPT4
 308     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
 309     if (ret != -1 || errno != ENOSYS) {
 310         return ret;
 311     }
 312 #endif
 313     ret = accept(s, addr, addrlen);
 314     if (ret >= 0) {
 315         qemu_set_cloexec(ret);
 316     }
 317
 318     return ret;
 319 }