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72 lines
2.8 KiB
Groff
72 lines
2.8 KiB
Groff
.\" Copyright (c) 2020 Apple Inc. All rights reserved.
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.\"
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.\" @APPLE_LICENSE_HEADER_START@
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.\"
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.\" This file contains Original Code and/or Modifications of Original Code
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.\" as defined in and that are subject to the Apple Public Source License
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.\" Version 2.0 (the 'License'). You may not use this file except in
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.\" compliance with the License. Please obtain a copy of the License at
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.\" http://www.opensource.apple.com/apsl/ and read it before using this
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.\" file.
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.\"
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.\" The Original Code and all software distributed under the License are
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.\" distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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.\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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.\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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.\" Please see the License for the specific language governing rights and
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.\" limitations under the License.
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.\"
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.\" @APPLE_LICENSE_HEADER_END@
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.\"
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.Dd May 1, 2020
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.Dt PTHREAD_JIT_WRITE_PROTECT_NP 3
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.Os
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.Sh NAME
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.Nm pthread_jit_write_protect_supported_np ,
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.Nm pthread_jit_write_protect_np
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.Nd thread JIT region write protection settings
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.Sh SYNOPSIS
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.In pthread.h
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.Ft int
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.Fn pthread_jit_write_protect_supported_np "void"
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.Ft void
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.Fn pthread_jit_write_protect_np "int enabled"
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.Sh DESCRIPTION
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The
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.Fn pthread_jit_write_protect_supported_np
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function returns whether the
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.Fn pthread_jit_write_protect_np
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API is supported on this platform. If
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.Fn pthread_jit_write_protect_np
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API is supported on this platform,
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.Fn pthread_jit_write_protect_np
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must be called to toggle per-thread write protection on the MAP_JIT region before the thread writes to or executes from the MAP_JIT region.
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.Pp
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The
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.Fn pthread_jit_write_protect_np
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function sets whether MAP_JIT region write protection is enabled for this thread.
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.Pp
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On platforms where
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.Fn pthread_jit_write_protect_supported_np
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is true, MAP_JIT regions are never writeable and executable simultaneously.
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When write protection is enabled for the thread, writes by the thread to the MAP_JIT region are denied and the MAP_JIT region is executable.
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When write protection is disabled for the thread, writes by the thread to the MAP_JIT region are allowed and the MAP_JIT region is not executable.
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Pass a non-zero value for the
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.Fa enabled
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parameter to enable thread JIT region write protection and allow execution. Pass a zero value for the
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.Fa enabled
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parameter to disable thread JIT write protection and deny execution.
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.Pp
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On platforms where
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.Fn pthread_jit_write_protect_supported_np
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is not supported, MAP_JIT regions are both simultaenously writeable and executable. Calls to
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.Fn pthread_jit_write_protect_np
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are no-ops on unsupported platforms.
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.Sh RETURN VALUES
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If supported, the
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.Fn pthread_jit_write_protect_supported_np
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function will return one. Otherwise the function will return zero.
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.Sh SEE ALSO
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.Xr mmap 2
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