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2763d20edd
Although we just checked that chdir(cwd) worked, there is a race where it could disappear while we are temporarily away. If that happens, forcefully give up rather than proceeding in the wrong directory. * lib/fchdir.c (get_name): Abort on unexpected chdir failure. * lib/rename.c (rpl_rename) [W32]: Likewise. (rpl_rename) [RENAME_DEST_EXISTS_BUG]: Avoid one case of losing an empty destination directory if source cannot be renamed, although there is still possibility for failure. * doc/posix-functions/rename.texi (rename): Document the race. Reported by Jim Meyering. Signed-off-by: Eric Blake <ebb9@byu.net>
62 lines
2.0 KiB
Plaintext
62 lines
2.0 KiB
Plaintext
@node rename
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@section @code{rename}
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@findex rename
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/rename.html}
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Gnulib module: rename
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function does not allow trailing slashes when creating a
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destination directory, as in @code{rename("dir","new/")}:
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NetBSD 1.6.
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@item
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This function does not reject trailing slashes on non-directories on
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some platforms, as in @code{rename("file","new/")}:
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Solaris 10, Cygwin 1.5.x, mingw.
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@item
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This function ignores trailing slashes on symlinks on some platforms,
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such that @code{rename("link/","new")} corrupts @file{link}:
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Solaris 9.
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@item
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This function incorrectly reduces the link count when comparing two
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spellings of a hard link on some platforms:
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NetBSD 1.6, Cygwin 1.5.x.
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@item
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This function will not always replace an existing destination on some
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platforms:
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Cygwin 1.5.x, mingw.
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However, the replacement is not atomic for directories, and may end up
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losing the empty destination if the source could not be renamed.
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@item
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This function mistakenly allows names ending in @samp{.} or @samp{..}
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on some platforms:
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Cygwin 1.5.x, mingw.
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@item
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This function does not reject attempts to rename existing directories
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and non-directories onto one another on some platforms:
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Cygwin 1.5.x, mingw.
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@item
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This function does not allow trailing slashes on source directories on
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older platforms, as in @samp{rename("dir/","new")}:
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SunOS 4.1.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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POSIX requires that @code{rename("symlink-to-dir/","dir2")} rename
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@file{dir} and leave @file{symlink-to-dir} dangling; likewise, it
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requires that @code{rename("dir","dangling/")} rename @file{dir} so
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that @file{dangling} is no longer a dangling symlink. This behavior
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is counter-intuitive, so on some systems, @code{rename} fails with
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@code{ENOTDIR} if either argument is a symlink with a trailing slash:
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glibc, OpenBSD, Cygwin 1.7.
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@item
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This function will not rename a source that is currently opened
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by any process:
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mingw.
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@end itemize
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