| 1 | /* macros used by openat-like functions
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| 2 | Copyright (C) 2005 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 2, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program; if not, write to the Free Software Foundation,
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| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 17 |
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| 18 | /* written by Jim Meyering */
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| 19 |
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| 20 | #include <stdio.h>
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| 21 | #include <string.h>
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| 22 | #include <errno.h>
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| 23 | #include "alloca.h"
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| 24 | #include "intprops.h"
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| 25 |
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| 26 | /* Set PROC_FD_FILENAME to the expansion of "/proc/self/fd/%d/%s" in
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| 27 | alloca'd memory, using FD and FILE, respectively for %d and %s. */
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| 28 | #define BUILD_PROC_NAME(Proc_fd_filename, Fd, File) \
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| 29 | do \
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| 30 | { \
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| 31 | size_t filelen = strlen (File); \
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| 32 | static const char procfd[] = "/proc/self/fd/%d/%s"; \
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| 33 | /* Buffer for the file name we are going to use. It consists of \
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| 34 | - the string /proc/self/fd/ \
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| 35 | - the file descriptor number \
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| 36 | - the file name provided. \
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| 37 | The final NUL is included in the sizeof. \
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| 38 | Subtract 4 to account for %d and %s. */ \
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| 39 | size_t buflen = sizeof (procfd) - 4 + INT_STRLEN_BOUND (Fd) + filelen; \
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| 40 | (Proc_fd_filename) = alloca (buflen); \
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| 41 | snprintf ((Proc_fd_filename), buflen, procfd, (Fd), (File)); \
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| 42 | } \
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| 43 | while (0)
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| 44 |
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| 45 | /* Some systems don't have ENOSYS. */
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| 46 | #ifndef ENOSYS
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| 47 | # ifdef ENOTSUP
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| 48 | # define ENOSYS ENOTSUP
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| 49 | # else
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| 50 | /* Some systems don't have ENOTSUP either. */
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| 51 | # define ENOSYS EINVAL
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| 52 | # endif
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| 53 | #endif
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| 54 |
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| 55 | /* Trying to access a BUILD_PROC_NAME file will fail on systems without
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| 56 | /proc support, and even on systems *with* ProcFS support. Return
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| 57 | nonzero if the failure may be legitimate, e.g., because /proc is not
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| 58 | readable, or the particular .../fd/N directory is not present. */
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| 59 | #define EXPECTED_ERRNO(Errno) \
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| 60 | ((Errno) == ENOTDIR || (Errno) == ENOENT \
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| 61 | || (Errno) == EPERM || (Errno) == EACCES \
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| 62 | || (Errno) == ENOSYS /* Solaris 8 */ \
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| 63 | || (Errno) == EOPNOTSUPP /* FreeBSD */)
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