libsyscall/wrappers/setpriority.c

   1 /*
   2  * Copyright (c) 2014 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <sys/resource.h>
  25 #include <errno.h>
  26 #include <mach/port.h>
  27
  28 extern int __setpriority(int which, id_t who, int prio);
  29 extern void _pthread_clear_qos_tsd(mach_port_t);
  30
  31 /*
  32  * Stub function to account for special case return code from setpriority
  33  * when called with PRIO_DARWIN_THREAD.
  34  */
  35 int
  36 setpriority(int which, id_t who, int prio)
  37 {
  38         int rv = __setpriority(which, who, prio);
  39         if (which == PRIO_DARWIN_THREAD && rv == -2) {
  40                 _pthread_clear_qos_tsd(MACH_PORT_NULL);
  41                 rv = 0;
  42         }
  43
  44         return rv;
  45 }