1 /* Copyright (C) 2005, 2006, 2009 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 <kernel-features.h>
26 #include <sysdep-cancel.h>
29 /* Create a new directory with permission bits MODE. But interpret
30 relative PATH names relative to the directory associated with FD. */
32 mkdirat (fd, file, mode)
40 # ifndef __ASSUME_ATFCTS
41 if (__have_atfcts >= 0)
44 res = INLINE_SYSCALL (mkdirat, 3, fd, file, mode);
45 # ifndef __ASSUME_ATFCTS
46 if (res == -1 && res == ENOSYS)
54 #ifndef __ASSUME_ATFCTS
57 if (fd != AT_FDCWD && file[0] != '/')
59 size_t filelen = strlen (file);
60 if (__builtin_expect (filelen == 0, 0))
66 static const char procfd[] = "/proc/self/fd/%d/%s";
67 /* Buffer for the path name we are going to use. It consists of
68 - the string /proc/self/fd/
69 - the file descriptor number
70 - the file name provided.
71 The final NUL is included in the sizeof. A bit of overhead
72 due to the format elements compensates for possible negative
74 size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
75 buf = alloca (buflen);
77 __snprintf (buf, buflen, procfd, fd, file);
81 INTERNAL_SYSCALL_DECL (err);
82 res = INTERNAL_SYSCALL (mkdir, err, 2, file, mode);
84 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (res, err), 0))
86 __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (res, err), fd, buf);