1 /* Copyright (C) 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <sys/types.h>
27 /* Change the owner and group of FILE. */
29 fchownat (fd
, file
, owner
, group
, flag
)
36 if (flag
& ~AT_SYMLINK_NOFOLLOW
)
44 if (fd
!= AT_FDCWD
&& file
[0] != '/')
46 size_t filelen
= strlen (file
);
47 static const char procfd
[] = "/proc/self/fd/%d/%s";
48 /* Buffer for the path name we are going to use. It consists of
49 - the string /proc/self/fd/
50 - the file descriptor number
51 - the file name provided.
52 The final NUL is included in the sizeof. A bit of overhead
53 due to the format elements compensates for possible negative
55 size_t buflen
= sizeof (procfd
) + sizeof (int) * 3 + filelen
;
56 buf
= alloca (buflen
);
58 __snprintf (buf
, buflen
, procfd
, fd
, file
);
63 INTERNAL_SYSCALL_DECL (err
);
65 if (flag
& AT_SYMLINK_NOFOLLOW
)
66 result
= INTERNAL_SYSCALL (lchown
, err
, 3, file
, owner
, group
);
68 result
= INTERNAL_SYSCALL (chown
, err
, 3, file
, owner
, group
);
70 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result
, err
), 0))
72 __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result
, err
), fd
, buf
);