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 #ifndef __ia64__
 108     return qemu_memalign(getpagesize(), size);
 109 #else
 110     return qemu_memalign(65536, size);
 111 #endif
 112 }
 113
 114 void qemu_vfree(void *ptr)
 115 {
 116     free(ptr);
 117 }
 118
 119 #endif
 120
 121 int qemu_create_pidfile(const char *filename)
 122 {
 123     char buffer[128];
 124     int len;
 125 #ifndef _WIN32
 126     int fd;
 127
 128     fd = open(filename, O_RDWR | O_CREAT, 0600);
 129     if (fd == -1)
 130         return -1;
 131
 132     if (lockf(fd, F_TLOCK, 0) == -1)
 133         return -1;
 134
 135     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 136     if (write(fd, buffer, len) != len)
 137         return -1;
 138 #else
 139     HANDLE file;
 140     DWORD flags;
 141     OVERLAPPED overlap;
 142     BOOL ret;
 143
 144     /* Open for writing with no sharing. */
 145     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
 146                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 147
 148     if (file == INVALID_HANDLE_VALUE)
 149       return -1;
 150
 151     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
 152     overlap.hEvent = 0;
 153     /* Lock 1 byte. */
 154     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
 155     if (ret == 0)
 156       return -1;
 157
 158     /* Write PID to file. */
 159     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
 160     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
 161                       &overlap, NULL);
 162     if (ret == 0)
 163       return -1;
 164 #endif
 165     return 0;
 166 }
 167
 168 #ifdef _WIN32
 169
 170 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
 171 #define _W32_FT_OFFSET (116444736000000000ULL)
 172
 173 int qemu_gettimeofday(qemu_timeval *tp)
 174 {
 175   union {
 176     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
 177     FILETIME ft;
 178   }  _now;
 179
 180   if(tp)
 181     {
 182       GetSystemTimeAsFileTime (&_now.ft);
 183       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
 184       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
 185     }
 186   /* Always return 0 as per Open Group Base Specifications Issue 6.
 187      Do not set errno on error.  */
 188   return 0;
 189 }
 190 #endif /* _WIN32 */
 191
 192
 193 #ifdef _WIN32
 194 void socket_set_nonblock(int fd)
 195 {
 196     unsigned long opt = 1;
 197     ioctlsocket(fd, FIONBIO, &opt);
 198 }
 199
 200 int inet_aton(const char *cp, struct in_addr *ia)
 201 {
 202     uint32_t addr = inet_addr(cp);
 203     if (addr == 0xffffffff)
 204         return 0;
 205     ia->s_addr = addr;
 206     return 1;
 207 }
 208 #else
 209 void socket_set_nonblock(int fd)
 210 {
 211     int f;
 212     f = fcntl(fd, F_GETFL);
 213     fcntl(fd, F_SETFL, f | O_NONBLOCK);
 214 }
 215 #endif