kc3-lang/gnulib/doc/posix-functions/renameat.texi

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• doc/posix-functions/renameat.texi

• @node renameat
  @section @code{renameat}
  @findex renameat
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/renameat.html}
  
  Gnulib module: renameat
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  This function is missing on some platforms:
  glibc 2.3.6, Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Cygwin 1.5.x, mingw, MSVC 14.
  But the replacement function is not safe to be used in libraries and is not
  multithread-safe.
  @item
  This function is declared in @code{<unistd.h>}, not in @code{<stdio.h>},
  on some platforms:
  NetBSD 7.0, Solaris 11.4.
  @item
  This function is declared in @code{<sys/stat.h>}, not in @code{<stdio.h>},
  on some platforms:
  Android 4.3.
  @item
  This function does not reject trailing slashes on non-directories on
  some platforms, as in @code{renameat(fd,"file",fd,"new/")}:
  Solaris 11.4.
  @item
  This function ignores trailing slashes on symlinks on some platforms,
  such that @code{renameat(fd,"link/",fd,"new")} corrupts @file{link}:
  Solaris 9.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  POSIX requires that @code{renameat(fd,"symlink-to-dir/",fd,"dir2")} rename
  @file{dir} and leave @file{symlink-to-dir} dangling; likewise, it
  requires that @code{renameat(fd,"dir",fd,"dangling/")} rename @file{dir} so
  that @file{dangling} is no longer a dangling symlink.  This behavior
  is counter-intuitive, so on some systems, @code{renameat} fails with
  @code{ENOTDIR} if either argument is a symlink with a trailing slash:
  glibc, OpenBSD, Cygwin 1.7.
  @item
  POSIX requires that @code{renameat} do nothing and return 0 if the
  source and destination are hard links to the same file.  This behavior
  is counterintuitive, and on some systems @code{renameat} is a no-op in
  this way only if the source and destination identify the same
  directory entry.  On these systems, for example, although renaming
  @file{./f} to @file{f} is a no-op, renaming @file{f} to @file{g}
  deletes @file{f} when @file{f} and @file{g} are hard links to the same
  file:
  NetBSD 7.0.
  @item
  After renaming a non-empty directory over an existing empty directory,
  the old directory name is still visible through the @code{stat} function
  for 30 seconds after the rename, on NFS file systems, on some platforms:
  Linux 2.6.18.
  @item
  This function will not rename a source that is currently opened
  by any process:
  mingw, MSVC 14.
  @end itemize
  

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