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author Karl Berry <karl@freefriends.org>
date Mon, 24 Aug 2015 06:09:19 -0700
parents 498a2211d839
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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 11 2011-11.
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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 declared in @code{<unistd.h>} instead of @code{<stdio.h>}
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21 on some platforms:
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22 Solaris 11 2011-11.
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23 @item
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24 This function is missing on some platforms:
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25 glibc 2.3.6, Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8,
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26 AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 8, Cygwin 1.5.x, mingw, MSVC 9,
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27 Interix 3.5, BeOS.
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28 But the replacement function is not safe to be used in libraries and is not multithread-safe.
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29 @end itemize
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30
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31 Portability problems not fixed by Gnulib:
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32 @itemize
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33 @item
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34 POSIX requires that @code{renameat(fd,"symlink-to-dir/",fd,"dir2")} rename
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35 @file{dir} and leave @file{symlink-to-dir} dangling; likewise, it
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36 requires that @code{renameat(fd,"dir",fd,"dangling/")} rename @file{dir} so
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37 that @file{dangling} is no longer a dangling symlink. This behavior
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38 is counter-intuitive, so on some systems, @code{renameat} fails with
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39 @code{ENOTDIR} if either argument is a symlink with a trailing slash:
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40 glibc, OpenBSD, Cygwin 1.7.
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41 @item
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42 After renaming a non-empty directory over an existing empty directory,
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43 the old directory name is still visible through the @code{stat} function
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44 for 30 seconds after the rename, on NFS file systems, on some platforms:
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45 Linux 2.6.18.
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46 @item
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47 This function will not rename a source that is currently opened
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48 by any process:
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49 mingw, MSVC 9.
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50 @end itemize