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glibc/sysdeps/unix/sysv/linux/i386/chown.c
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/* Copyright (C) 1998, 1999, 2000 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 Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. 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. | |
*/ | |
extern int __syscall_chown (const char *__file, | |
__kernel_uid_t __owner, __kernel_gid_t __group); | |
extern int __chown_is_lchown (const char *__file, uid_t __owner, | |
gid_t __group); | |
extern int __real_chown (const char *__file, uid_t __owner, gid_t __group); | |
#if defined __NR_lchown || __ASSUME_LCHOWN_SYSCALL > 0 | |
/* Running under Linux > 2.1.80. */ | |
# ifdef __NR_chown32 | |
extern int __syscall_chown32 (const char *__file, | |
__kernel_uid32_t owner, __kernel_gid32_t group); | |
# 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_LCHOWN_SYSCALL == 0 | |
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); | |
# elif __ASSUME_32BITUIDS | |
/* This implies __ASSUME_LCHOWN_SYSCALL. */ | |
return INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group); | |
# else | |
/* !__ASSUME_32BITUIDS && ASSUME_LCHOWN_SYSCALL */ | |
# 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; | |
} | |
return INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group); | |
# endif | |
} | |
#endif | |
#if !defined __NR_lchown && __ASSUME_LCHOWN_SYSCALL == 0 | |
/* Compiling under older kernels. */ | |
int | |
__chown_is_lchown (const char *file, uid_t owner, gid_t group) | |
{ | |
return INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group); | |
} | |
#elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
/* Compiling for compatibiity. */ | |
int | |
__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); | |
#endif | |
#ifdef __NR_lchown | |
strong_alias (__real_chown, _real_chown) | |
versioned_symbol (libc, __real_chown, __chown, GLIBC_2_1); | |
versioned_symbol (libc, _real_chown, chown, GLIBC_2_1); | |
#else | |
strong_alias (__chown_is_lchown, __chown_is_lchown21) | |
strong_alias (__chown_is_lchown, _chown_is_lchown21) | |
versioned_symbol (libc, __chown_is_lchown21, __chown, GLIBC_2_1); | |
versioned_symbol (libc, _chown_is_lchown21, chown, GLIBC_2_1); | |
#endif |