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annotate lib/openat-priv.h @ 17363:5a51fb7777a9

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sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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1 /* Internals for openat-like functions.
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2
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3 Copyright (C) 2005-2006, 2009-2013 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* written by Jim Meyering */
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19
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20 #ifndef _GL_HEADER_OPENAT_PRIV
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21 #define _GL_HEADER_OPENAT_PRIV
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22
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23 #include <errno.h>
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24 #include <limits.h>
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25 #include <stdlib.h>
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27 /* Maximum number of bytes that it is safe to allocate as a single
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28 array on the stack, and that is known as a compile-time constant.
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29 The assumption is that we'll touch the array very quickly, or a
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30 temporary very near the array, provoking an out-of-memory trap. On
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31 some operating systems, there is only one guard page for the stack,
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32 and a page size can be as small as 4096 bytes. Subtract 64 in the
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33 hope that this will let the compiler touch a nearby temporary and
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34 provoke a trap. */
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35 #define SAFER_ALLOCA_MAX (4096 - 64)
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36
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37 #define SAFER_ALLOCA(m) ((m) < SAFER_ALLOCA_MAX ? (m) : SAFER_ALLOCA_MAX)
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38
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39 #if defined PATH_MAX
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40 # define OPENAT_BUFFER_SIZE SAFER_ALLOCA (PATH_MAX)
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41 #elif defined _XOPEN_PATH_MAX
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42 # define OPENAT_BUFFER_SIZE SAFER_ALLOCA (_XOPEN_PATH_MAX)
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43 #else
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44 # define OPENAT_BUFFER_SIZE SAFER_ALLOCA (1024)
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45 #endif
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46
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47 char *openat_proc_name (char buf[OPENAT_BUFFER_SIZE], int fd, char const *file);
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48
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49 /* Trying to access a BUILD_PROC_NAME file will fail on systems without
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50 /proc support, and even on systems *with* ProcFS support. Return
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51 nonzero if the failure may be legitimate, e.g., because /proc is not
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52 readable, or the particular .../fd/N directory is not present. */
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53 #define EXPECTED_ERRNO(Errno) \
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54 ((Errno) == ENOTDIR || (Errno) == ENOENT \
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55 || (Errno) == EPERM || (Errno) == EACCES \
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56 || (Errno) == ENOSYS /* Solaris 8 */ \
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57 || (Errno) == EOPNOTSUPP /* FreeBSD */)
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58
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59 /* Wrapper function shared among linkat and renameat. */
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60 int at_func2 (int fd1, char const *file1,
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61 int fd2, char const *file2,
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62 int (*func) (char const *file1, char const *file2));
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63
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64 #endif /* _GL_HEADER_OPENAT_PRIV */