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glibc/sysdeps/unix/sysv/linux/personality.c
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/* Copyright (C) 2015-2016 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 | |
<http://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 | |
INTERNAL_SYSCALL_DECL (err); | |
long ret = INTERNAL_SYSCALL (personality, err, 1, 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, err))) | |
ret = -INTERNAL_SYSCALL_ERRNO (ret, err); | |
return ret; | |
} | |
weak_alias (__personality, personality) |