1 /* Copyright (C) 2005, 2006, 2009, 2011 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, see
16 <http://www.gnu.org/licenses/>. */
24 #include <kernel-features.h>
25 #include <sysdep-cancel.h>
28 /* Create a new directory with permission bits MODE. But interpret
29 relative PATH names relative to the directory associated with FD. */
31 mkdirat (fd
, file
, mode
)
39 # ifndef __ASSUME_ATFCTS
40 if (__have_atfcts
>= 0)
43 res
= INLINE_SYSCALL (mkdirat
, 3, fd
, file
, mode
);
44 # ifndef __ASSUME_ATFCTS
45 if (res
== -1 && errno
== ENOSYS
)
53 #ifndef __ASSUME_ATFCTS
56 if (fd
!= AT_FDCWD
&& file
[0] != '/')
58 size_t filelen
= strlen (file
);
59 if (__builtin_expect (filelen
== 0, 0))
65 static const char procfd
[] = "/proc/self/fd/%d/%s";
66 /* Buffer for the path name we are going to use. It consists of
67 - the string /proc/self/fd/
68 - the file descriptor number
69 - the file name provided.
70 The final NUL is included in the sizeof. A bit of overhead
71 due to the format elements compensates for possible negative
73 size_t buflen
= sizeof (procfd
) + sizeof (int) * 3 + filelen
;
74 buf
= alloca (buflen
);
76 __snprintf (buf
, buflen
, procfd
, fd
, file
);
80 INTERNAL_SYSCALL_DECL (err
);
81 res
= INTERNAL_SYSCALL (mkdir
, err
, 2, file
, mode
);
83 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (res
, err
), 0))
85 __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (res
, err
), fd
, buf
);