File: personality.c

package info (click to toggle)
glibc 2.24-10
  • links: PTS, VCS
  • area: main
  • in suites:
  • size: 223,412 kB
  • sloc: ansic: 991,967; asm: 261,800; sh: 10,385; makefile: 9,710; cpp: 4,169; python: 3,971; perl: 2,254; awk: 1,753; pascal: 1,521; yacc: 291; sed: 80
file content (49 lines) | stat: -rw-r--r-- 2,054 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
/* 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)