oslib-posix.c

   1 /*
   2  * os-posix-lib.c
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2010 Red Hat, Inc.
   6  *
   7  * QEMU library functions on POSIX which are shared between QEMU and
   8  * the QEMU tools.
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28
  29 #include "config-host.h"
  30 #include "sysemu.h"
  31 #include "trace.h"
  32
  33 #if !defined(_POSIX_C_SOURCE) || defined(__sun__)
  34 static void *oom_check(void *ptr)
  35 {
  36     if (ptr == NULL) {
  37         fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno));
  38         abort();
  39     }
  40     return ptr;
  41 }
  42 #endif
  43
  44 void *qemu_memalign(size_t alignment, size_t size)
  45 {
  46     void *ptr;
  47 #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
  48     int ret;
  49     ret = posix_memalign(&ptr, alignment, size);
  50     if (ret != 0) {
  51         fprintf(stderr, "Failed to allocate %zu B: %s\n",
  52                 size, strerror(ret));
  53         abort();
  54     }
  55 #elif defined(CONFIG_BSD)
  56     ptr = oom_check(valloc(size));
  57 #else
  58     ptr = oom_check(memalign(alignment, size));
  59 #endif
  60     trace_qemu_memalign(alignment, size, ptr);
  61     return ptr;
  62 }
  63
  64 /* alloc shared memory pages */
  65 void *qemu_vmalloc(size_t size)
  66 {
  67     return qemu_memalign(getpagesize(), size);
  68 }
  69
  70 void qemu_vfree(void *ptr)
  71 {
  72     trace_qemu_vfree(ptr);
  73     free(ptr);
  74 }