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annotate doc/posix-functions/renameat.texi @ 12355:9961377da68e

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pread: new module * modules/pread: New file. * lib/pread.c (pread): New file. * m4/pread.m4: Likewise. * lib/unistd.in.h (pread): Define/declare. * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Define defaults. * modules/unistd (Makefile.am): Substitute witnesses. * doc/posix-functions/pread.texi (pread): Update. * MODULES.html.sh: Add pread.
author Jim Meyering <meyering@redhat.com>
date Wed, 25 Nov 2009 14:33:30 +0100
parents 8e8f0292e99f
children bb0ceefd22dc
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1 @node renameat
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2 @section @code{renameat}
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3 @findex renameat
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4
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5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/renameat.html}
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6
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7 Gnulib module: renameat
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8
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9 Portability problems fixed by Gnulib:
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10 @itemize
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11 @item
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12 This function does not reject trailing slashes on non-directories on
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13 some platforms, as in @code{renameat(fd,"file",fd,"new/")}:
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14 Solaris 10.
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15 @item
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16 This function ignores trailing slashes on symlinks on some platforms,
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17 such that @code{renameat(fd,"link/",fd,"new")} corrupts @file{link}:
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18 Solaris 9.
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19 @item
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20 This function is missing on some platforms:
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21 glibc 2.3.6, MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX
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22 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 8, Cygwin 1.5.x, mingw,
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23 Interix 3.5, BeOS.
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24 But the replacement function is not safe to be used in libraries and is not multithread-safe.
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25 @end itemize
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26
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27 Portability problems not fixed by Gnulib:
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28 @itemize
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29 @item
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30 POSIX requires that @code{renameat(fd,"symlink-to-dir/",fd,"dir2")} rename
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31 @file{dir} and leave @file{symlink-to-dir} dangling; likewise, it
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32 requires that @code{renameat(fd,"dir",fd,"dangling/")} rename @file{dir} so
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33 that @file{dangling} is no longer a dangling symlink. This behavior
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34 is counter-intuitive, so on some systems, @code{renameat} fails with
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35 @code{ENOTDIR} if either argument is a symlink with a trailing slash:
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36 glibc, OpenBSD, Cygwin 1.7.
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37 @item
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38 This function will not rename a source that is currently opened
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39 by any process:
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40 mingw.
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41 @end itemize