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2ee444b5fe
* .x-sc_require_config_h: Add lib/at-func.c. [lib/] * at-func.c: New file, with the logic of all emulated at-functions. * openat-priv.h: Include <errno.h> and define ENOSYS, in support of the EXPECTED_ERRNO macro. * openat.c (fstatat, unlinkat, fchownat): Remove function definitions. Instead, define the appropriate symbols and include "at-func.c". * mkdirat.c (mkdirat): Likewise. * fchmodat.c (fchmodat): Likewise. (ENOSYS): Remove definition. * openat.c: Don't include <errno.h>, now that "openat-priv.h" does it. Don't include "unistd--.h" -- it wasn't ever used. [m4/] * openat.m4 (gl_FUNC_OPENAT): Add at-func.c via AC_LIBSOURCES.
64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
/* macros used by openat-like functions
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Copyright (C) 2005 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* written by Jim Meyering */
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "alloca.h"
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#include "intprops.h"
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/* Set PROC_FD_FILENAME to the expansion of "/proc/self/fd/%d/%s" in
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alloca'd memory, using FD and FILE, respectively for %d and %s. */
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#define BUILD_PROC_NAME(Proc_fd_filename, Fd, File) \
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do \
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{ \
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size_t filelen = strlen (File); \
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static const char procfd[] = "/proc/self/fd/%d/%s"; \
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/* Buffer for the file name we are going to use. It consists of \
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- the string /proc/self/fd/ \
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- the file descriptor number \
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- the file name provided. \
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The final NUL is included in the sizeof. \
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Subtract 4 to account for %d and %s. */ \
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size_t buflen = sizeof (procfd) - 4 + INT_STRLEN_BOUND (Fd) + filelen; \
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(Proc_fd_filename) = alloca (buflen); \
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snprintf ((Proc_fd_filename), buflen, procfd, (Fd), (File)); \
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} \
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while (0)
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/* Some systems don't have ENOSYS. */
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#ifndef ENOSYS
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# ifdef ENOTSUP
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# define ENOSYS ENOTSUP
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# else
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/* Some systems don't have ENOTSUP either. */
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# define ENOSYS EINVAL
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# endif
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#endif
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/* Trying to access a BUILD_PROC_NAME file will fail on systems without
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/proc support, and even on systems *with* ProcFS support. Return
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nonzero if the failure may be legitimate, e.g., because /proc is not
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readable, or the particular .../fd/N directory is not present. */
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#define EXPECTED_ERRNO(Errno) \
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((Errno) == ENOTDIR || (Errno) == ENOENT \
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|| (Errno) == EPERM || (Errno) == EACCES \
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|| (Errno) == ENOSYS /* Solaris 8 */ \
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|| (Errno) == EOPNOTSUPP /* FreeBSD */)
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