| /* Copyright (C) 2000,2001,2002,2003,2004,2006 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| |
| #include <sysdep.h> |
| #include <sys/syscall.h> |
| #include <shlib-compat.h> |
| #include <bp-checks.h> |
| |
| #include <linux/posix_types.h> |
| #include <kernel-features.h> |
| |
| /* |
| In Linux 2.1.x the chown functions have been changed. A new function lchown |
| was introduced. The new chown now follows symlinks - the old chown and the |
| new lchown do not follow symlinks. |
| The new lchown function has the same number as the old chown had and the |
| new chown has a new number. When compiling with headers from Linux > 2.1.8x |
| it's impossible to run this libc with older kernels. In these cases libc |
| has therefore to route calls to chown to the old chown function. |
| */ |
| |
| /* Running under Linux > 2.1.80. */ |
| |
| #ifdef __NR_chown32 |
| # if __ASSUME_32BITUIDS == 0 |
| /* This variable is shared with all files that need to check for 32bit |
| uids. */ |
| extern int __libc_missing_32bit_uids; |
| # endif |
| #endif /* __NR_chown32 */ |
| |
| int |
| __real_chown (const char *file, uid_t owner, gid_t group) |
| { |
| #if __ASSUME_32BITUIDS > 0 |
| return INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group); |
| #else |
| static int __libc_old_chown; |
| int result; |
| |
| if (!__libc_old_chown) |
| { |
| int saved_errno = errno; |
| # ifdef __NR_chown32 |
| if (__libc_missing_32bit_uids <= 0) |
| { |
| int result; |
| int saved_errno = errno; |
| |
| result = INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group); |
| if (result == 0 || errno != ENOSYS) |
| return result; |
| |
| __set_errno (saved_errno); |
| __libc_missing_32bit_uids = 1; |
| } |
| # endif /* __NR_chown32 */ |
| if (((owner + 1) > (uid_t) ((__kernel_uid_t) -1U)) |
| || ((group + 1) > (gid_t) ((__kernel_gid_t) -1U))) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| result = INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group); |
| |
| if (result >= 0 || errno != ENOSYS) |
| return result; |
| |
| __set_errno (saved_errno); |
| __libc_old_chown = 1; |
| } |
| |
| return __lchown (file, owner, group); |
| #endif |
| } |
| |
| |
| #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
| /* Compiling for compatibiity. */ |
| int |
| attribute_compat_text_section |
| __chown_is_lchown (const char *file, uid_t owner, gid_t group) |
| { |
| return __lchown (file, owner, group); |
| } |
| #endif |
| |
| #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
| strong_alias (__chown_is_lchown, _chown_is_lchown) |
| compat_symbol (libc, __chown_is_lchown, __chown, GLIBC_2_0); |
| compat_symbol (libc, _chown_is_lchown, chown, GLIBC_2_0); |
| |
| strong_alias (__real_chown, _real_chown) |
| versioned_symbol (libc, __real_chown, __chown, GLIBC_2_1); |
| versioned_symbol (libc, _real_chown, chown, GLIBC_2_1); |
| libc_hidden_ver (__real_chown, __chown) |
| #else |
| strong_alias (__real_chown, __chown) |
| libc_hidden_def (__chown) |
| weak_alias (__real_chown, chown) |
| #endif |