1 /* macros used by openat-like functions
2 Copyright (C) 2005 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* written by Jim Meyering */
26 /* Set PROC_FD_FILENAME to the expansion of "/proc/self/fd/%d/%s" in
27 alloca'd memory, using FD and FILE, respectively for %d and %s. */
28 #define BUILD_PROC_NAME(Proc_fd_filename, Fd, File) \
31 size_t filelen = strlen (File); \
32 static const char procfd[] = "/proc/self/fd/%d/%s"; \
33 /* Buffer for the file name we are going to use. It consists of \
34 - the string /proc/self/fd/ \
35 - the file descriptor number \
36 - the file name provided. \
37 The final NUL is included in the sizeof. \
38 Subtract 4 to account for %d and %s. */ \
39 size_t buflen = sizeof (procfd) - 4 + INT_STRLEN_BOUND (Fd) + filelen; \
40 (Proc_fd_filename) = alloca (buflen); \
41 snprintf ((Proc_fd_filename), buflen, procfd, (Fd), (File)); \
45 /* Some systems don't have ENOSYS. */
48 # define ENOSYS ENOTSUP
50 /* Some systems don't have ENOTSUP either. */
51 # define ENOSYS EINVAL
55 /* Trying to access a BUILD_PROC_NAME file will fail on systems without
56 /proc support, and even on systems *with* ProcFS support. Return
57 nonzero if the failure may be legitimate, e.g., because /proc is not
58 readable, or the particular .../fd/N directory is not present. */
59 #define EXPECTED_ERRNO(Errno) \
60 ((Errno) == ENOTDIR || (Errno) == ENOENT \
61 || (Errno) == EPERM || (Errno) == EACCES \
62 || (Errno) == ENOSYS /* Solaris 8 */ \
63 || (Errno) == EOPNOTSUPP /* FreeBSD */)