xnu-2782.1.97.tar.gz

[apple/xnu.git] / libsyscall / wrappers / setpriority.c

diff --git a/libsyscall/wrappers/setpriority.c b/libsyscall/wrappers/setpriority.c
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+/*
+ * Copyright (c) 2014 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <sys/resource.h>
+#include <errno.h>
+#include <mach/port.h>
+
+extern int __setpriority(int which, id_t who, int prio);
+extern void _pthread_clear_qos_tsd(mach_port_t);
+
+/*
+ * Stub function to account for special case return code from setpriority
+ * when called with PRIO_DARWIN_THREAD.
+ */
+int
+setpriority(int which, id_t who, int prio)
+{
+       int rv = __setpriority(which, who, prio);
+       if (which == PRIO_DARWIN_THREAD && rv == -2) {
+               _pthread_clear_qos_tsd(MACH_PORT_NULL);
+               rv = 0;
+       }
+
+       return rv;
+}