1 /* unlinkat -- Remove a link by relative name.
2 Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 #include <kernel-features.h>
31 /* Remove the link named NAME. */
33 unlinkat (fd, file, flag)
41 # ifndef __ASSUME_ATFCTS
42 if (__have_atfcts >= 0)
45 result = INLINE_SYSCALL (unlinkat, 3, fd, file, flag);
46 # ifndef __ASSUME_ATFCTS
47 if (result == -1 && errno == ENOSYS)
55 #ifndef __ASSUME_ATFCTS
56 if (flag & ~AT_REMOVEDIR)
64 if (fd != AT_FDCWD && file[0] != '/')
66 size_t filelen = strlen (file);
67 if (__builtin_expect (filelen == 0, 0))
73 static const char procfd[] = "/proc/self/fd/%d/%s";
74 /* Buffer for the path name we are going to use. It consists of
75 - the string /proc/self/fd/
76 - the file descriptor number
77 - the file name provided.
78 The final NUL is included in the sizeof. A bit of overhead
79 due to the format elements compensates for possible negative
81 size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
82 buf = __alloca (buflen);
84 __snprintf (buf, buflen, procfd, fd, file);
88 INTERNAL_SYSCALL_DECL (err);
90 if (flag & AT_REMOVEDIR)
91 result = INTERNAL_SYSCALL (rmdir, err, 1, file);
93 result = INTERNAL_SYSCALL (unlink, err, 1, file);
95 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0))
97 __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf);