kvm-compatfd.c

   1 /*
   2  * signalfd/eventfd compatibility
   3  *
   4  * Copyright IBM, Corp. 2008
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu-common.h"
  15 #include "qemu-kvm.h"
  16
  17 #include <sys/syscall.h>
  18
  19 int kvm_eventfd(int *fds)
  20 {
  21 #if defined(SYS_eventfd)
  22     int ret;
  23
  24     ret = syscall(SYS_eventfd, 0);
  25     if (ret >= 0) {
  26         fds[0] = fds[1] = ret;
  27         return 0;
  28     } else if (!(ret == -1 && errno == ENOSYS))
  29         return ret;
  30 #endif
  31
  32     return pipe(fds);
  33 }