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/* 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 <errno.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)
/* Some systems don't have ENOSYS. */
#ifndef ENOSYS
# ifdef ENOTSUP
# define ENOSYS ENOTSUP
# else
/* Some systems don't have ENOTSUP either. */
# define ENOSYS EINVAL
# endif
#endif
/* 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) == ENOSYS /* Solaris 8 */ \
|| (Errno) == EOPNOTSUPP /* FreeBSD */)
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