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96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
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/* Copyright (C) 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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/*
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In Linux 2.1.x the chown functions have been changed. A new function lchown
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was introduced. The new chown now follows symlinks - the old chown and the
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new lchown do not follow symlinks.
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The new lchown function has the same number as the old chown had and the
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new chown has a new number. When compiling with headers from Linux > 2.1.8x
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it's impossible to run this libc with older kernels. In these cases libc
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has therefore to route calls to chown to the old chown function.
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*/
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extern int __syscall_chown (const char *__file,
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uid_t __owner, gid_t __group);
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#ifdef __NR_lchown
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/* running under Linux 2.0 or < 2.1.8x */
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static int __libc_old_chown;
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int
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__real_chown (const char *file, uid_t owner, gid_t group)
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{
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int result;
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if (!__libc_old_chown)
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{
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int saved_errno = errno;
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result = __syscall_chown (file, owner, group);
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if (result >= 0 || errno != ENOSYS)
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return result;
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__set_errno (saved_errno);
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__libc_old_chown = 1;
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}
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return __lchown (file, owner, group);
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}
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#endif
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#if !defined __NR_lchown || \
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(defined HAVE_ELF && defined PIC && defined DO_VERSIONING)
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/* compiling under older kernels or for compatibiity */
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int
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__chown_is_lchown (const char *file, uid_t owner, gid_t group)
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{
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return __lchown (file, owner, group);
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}
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#endif
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#if defined HAVE_ELF && defined PIC && defined DO_VERSIONING
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strong_alias (__chown_is_lchown, _chown_is_lchown)
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symbol_version (__chown_is_lchown, __chown, GLIBC_2.0);
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symbol_version (_chown_is_lchown, chown, GLIBC_2.0);
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# ifdef __NR_lchown
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strong_alias (__real_chown, _real_chown)
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default_symbol_version (__real_chown, __chown, GLIBC_2.1);
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default_symbol_version (_real_chown, chown, GLIBC_2.1);
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# else
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strong_alias (__chown_is_lchown, __chown_is_lchown21)
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strong_alias (__chown_is_lchown, _chown_is_lchown21)
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default_symbol_version (__chown_is_lchown21, __chown, GLIBC_2.1);
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default_symbol_version (_chown_is_lchown21, chown, GLIBC_2.1);
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# endif
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#else
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# ifdef __NR_lchown
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strong_alias (__real_chown, __chown)
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weak_alias (__real_chown, chown)
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# else
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strong_alias (__chown_is_lchown, __chown)
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weak_alias (__chown_is_lchown, chown)
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# endif
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#endif
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