diff options
author | Jim Meyering <jim@meyering.net> | 2005-11-30 13:03:21 +0000 |
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committer | Jim Meyering <jim@meyering.net> | 2005-11-30 13:03:21 +0000 |
commit | 07c80bab50dab022b8ddfeebce8a2a544180f7cd (patch) | |
tree | 5431e97434ab5748ff068f124bff430056b64b81 /lib | |
parent | 48a8638c23ff8205f4a448be6ff9ca17db906e6c (diff) | |
download | coreutils-07c80bab50dab022b8ddfeebce8a2a544180f7cd.tar.xz |
Define macros used by mkdirat.c and openat.c.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/openat-priv.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/openat-priv.h b/lib/openat-priv.h new file mode 100644 index 000000000..ca4c8a2a1 --- /dev/null +++ b/lib/openat-priv.h @@ -0,0 +1,51 @@ +/* macros used by openat-like functions + Copyright (C) 2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* written by Jim Meyering */ + +#include <stdio.h> +#include <string.h> +#include "alloca.h" +#include "intprops.h" + +/* Set PROC_FD_FILENAME to the expansion of "/proc/self/fd/%d/%s" in + alloca'd memory, using FD and FILE, respectively for %d and %s. */ +#define BUILD_PROC_NAME(Proc_fd_filename, Fd, File) \ + do \ + { \ + size_t filelen = strlen (File); \ + static const char procfd[] = "/proc/self/fd/%d/%s"; \ + /* Buffer for the file name we are going to use. It consists of \ + - the string /proc/self/fd/ \ + - the file descriptor number \ + - the file name provided. \ + The final NUL is included in the sizeof. \ + Subtract 4 to account for %d and %s. */ \ + size_t buflen = sizeof (procfd) - 4 + INT_STRLEN_BOUND (Fd) + filelen; \ + (Proc_fd_filename) = alloca (buflen); \ + snprintf ((Proc_fd_filename), buflen, procfd, (Fd), (File)); \ + } \ + while (0) + +/* Trying to access a BUILD_PROC_NAME file will fail on systems without + /proc support, and even on systems *with* ProcFS support. Return + nonzero if the failure may be legitimate, e.g., because /proc is not + readable, or the particular .../fd/N directory is not present. */ +#define EXPECTED_ERRNO(Errno) \ + ((Errno) == ENOTDIR || (Errno) == ENOENT \ + || (Errno) == EPERM || (Errno) == EACCES \ + || (Errno) == EOPNOTSUPP /* FreeBSD */) |