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

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• Hash : 6ef93da4
  Author :
  Date : 2010-11-21T21:31:19
  

  Update for NetBSD 5.0.
  
  * m4/printf.m4 (gl_PRINTF_INFINITE_LONG_DOUBLE): Don't guess yes on
  NetBSD; the test fails on NetBSD 5.0.
  * doc/{glibc,posix,pastposix}-{headers,functions}/*.texi: Update info
  about NetBSD.
  

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• doc/posix-functions/readlinkat.texi

• @node readlinkat
  @section @code{readlinkat}
  @findex readlinkat
  
  POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html}
  
  Gnulib module: readlinkat
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  This function is missing on some platforms:
  glibc 2.3.6, MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX
  5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, Interix 3.5, BeOS.
  But the replacement function is not safe to be used in libraries and is not multithread-safe.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  This function always fails on platforms that don't support symlinks:
  mingw
  @item
  When @code{readlink} is called on a directory: In the case of NFS mounted
  directories, Cygwin sets @code{errno} to @code{ENOENT} or @code{EIO} instead of
  @code{EINVAL}.  To avoid this problem, check for a directory before calling
  @code{readlink}.
  @item
  When @code{readlink} is called on a file that is not a symbolic link:
  Irix may set @code{errno} to @code{ENXIO} instead of @code{EINVAL}.  Cygwin
  may set errno to @code{EACCES} instead of @code{EINVAL}.
  @item
  Symlink contents do not always have a trailing null byte, and there is
  no indication if symlink contents were truncated if the return value
  matches the length.  Furthermore, AIX 5.1 and HP-UX 11 set
  @code{errno} to @code{ERANGE} rather than returning truncated
  contents, and Linux sets @code{errno} to @code{EINVAL} if the
  requested length is zero.  Use the gnulib module areadlink for
  improved ability to read symlink contents.
  @end itemize
  

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