readlink: document portability issue with symlink length

[pspp] / ChangeLog

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 2009-09-23  Eric Blake  <ebb9@byu.net>
 
+       readlink: document portability issue with symlink length
+       * doc/posix-functions/lstat.texi (lstat): Mention that some file
+       systems have bogus st_size on symlinks, and mention the
+       areadlink-with-size module.
+       * doc/posix-functions/fstatat.texi (fstatat): Likewise.
+       * doc/posix-functions/readlink.texi (readlink): Mention the
+       areadlink module, and ERANGE failure.
+       * doc/posix-functions/readlinkat.texi (readlinkat): Likewise.
+       * tests/test-readlink.c (main): Relax test for AIX, HP-UX.
+
+       readlink: fix Solaris 9 bug with trailing slash
+       * lib/readlink.c (rpl_readlink): Work around trailing slash bug.
+       * m4/readlink.m4 (gl_FUNC_READLINK): Detect the bug.
+       * doc/posix-functions/readlink.texi (readlink): Document this.
+       * modules/readlink-tests: New test.
+       * tests/test-readlink.c: Likewise.
+
+       readlink: fix cygwin 1.5.x bug with return type
+       * m4/readlink.m4 (gl_FUNC_READLINK): Require correct signature.
+       * lib/unistd.in.h (readlink): Use ssize_t.
+       * lib/readlink.c (readlink): Likewise.
+       * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Add witness.
+       * modules/unistd (Makefile.am): Substitute it.
+       * lib/unistd.in.h (readlink): Declare replacement.
+       * doc/posix-functions/readlink.texi (readlink): Document this.
+
+       symlink: use throughout gnulib
+       * m4/symlinkat.m4 (gl_FUNC_SYMLINKAT): Omit symlink check.
+       * lib/symlinkat.c (symlinkat) [!HAVE_SYMLINK]: Document why
+       symlink is not used.
+       * modules/symlinkat (Depends-on): Add symlink.
+       * modules/canonicalize-lgpl-tests (Depends-on): Likewise.
+       * modules/canonicalize-tests (Depends-on): Likewise.
+       * modules/lstat-tests (Depends-on): Likewise.
+       * modules/openat-tests (Depends-on): Likewise.
+       * modules/remove-tests (Depends-on): Likewise.
+       * modules/rmdir-tests (Depends-on): Likewise.
+       * modules/unlink-tests (Depends-on): Likewise.
+       * tests/test-canonicalize-lgpl.c (symlink): Delete stub.
+       * tests/test-canonicalize.c (symlink): Likewise.
+       * tests/test-fstatat.c (symlink): Likewise.
+       * tests/test-lstat.c (symlink): Likewise.
+       * tests/test-remove.c (symlink): Likewise.
+       * tests/test-rmdir.c (symlink): Likewise.
+       * tests/test-unlink.c (symlink): Likewise.
+       * tests/test-unlinkat.c (symlink): Likewise.
+
        symlink: new module, for Solaris 9 bug
        * modules/symlink: New file.
        * m4/symlink.m4 (gl_FUNC_SYMLINK): Likewise.