1  /* Copyright (C) 1992-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <mach.h>
      20  #include <sys/time.h>
      21  #include <unistd.h>
      22  #include <sysdep-cancel.h>
      23  
      24  /* Sleep USECONDS microseconds, or until a previously set timer goes off.  */
      25  int
      26  usleep (useconds_t useconds)
      27  {
      28    mach_port_t recv;
      29    int cancel_oldtype;
      30    mach_msg_timeout_t timeout = useconds / 1000 + (useconds % 1000 != 0);
      31  
      32    recv = __mach_reply_port ();
      33  
      34    cancel_oldtype = LIBC_CANCEL_ASYNC();
      35    (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
      36  		     0, 0, recv, timeout, MACH_PORT_NULL);
      37    LIBC_CANCEL_RESET (cancel_oldtype);
      38    __mach_port_destroy (mach_task_self (), recv);
      39  
      40    return 0;
      41  }