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/* Copyright (C) 2015-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/personality.h>
#include <sysdep.h>
extern __typeof (personality) __personality;
int
__personality (unsigned long persona)
{
#ifdef PERSONALITY_TRUNCATE_ARGUMENT
/* Starting with kernel commit v2.6.21-3117-g97dc32c, the type of
task_struct->pesonality is "unsigned int".
Starting with kernel commit v2.6.35-rc1-372-g485d527, the personality
syscall accepts "unsigned int" instead of "long unsigned int".
Inbetween, a personality argument that does not fit into "unsigned int"
would result to system call returning -EINVAL.
We explicitly truncate the personality argument to "unsigned int"
to eliminate the uncertainty. */
persona = (unsigned int) persona;
#endif
long int ret = INTERNAL_SYSCALL_CALL (personality, persona);
/* Starting with kernel commit v2.6.29-6609-g11d06b2, the personality syscall
never fails. However, 32-bit kernels might flag valid values as errors, so
we need to reverse the error setting. We can't use the raw result as some
arches split the return/error values. */
if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (ret)))
ret = -INTERNAL_SYSCALL_ERRNO (ret);
return ret;
}
weak_alias (__personality, personality)
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