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50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
/* Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/personality.h>
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#include <sysdep.h>
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extern __typeof (personality) __personality;
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int
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__personality (unsigned long persona)
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{
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#ifdef PERSONALITY_TRUNCATE_ARGUMENT
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/* Starting with kernel commit v2.6.21-3117-g97dc32c, the type of
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task_struct->pesonality is "unsigned int".
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Starting with kernel commit v2.6.35-rc1-372-g485d527, the personality
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syscall accepts "unsigned int" instead of "long unsigned int".
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Inbetween, a personality argument that does not fit into "unsigned int"
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would result to system call returning -EINVAL.
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We explicitly truncate the personality argument to "unsigned int"
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to eliminate the uncertainty. */
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persona = (unsigned int) persona;
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#endif
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INTERNAL_SYSCALL_DECL (err);
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long ret = INTERNAL_SYSCALL (personality, err, 1, persona);
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/* Starting with kernel commit v2.6.29-6609-g11d06b2, the personality syscall
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never fails. However, 32-bit kernels might flag valid values as errors, so
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we need to reverse the error setting. We can't use the raw result as some
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arches split the return/error values. */
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if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (ret, err)))
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ret = -INTERNAL_SYSCALL_ERRNO (ret, err);
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return ret;
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}
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weak_alias (__personality, personality)
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