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authorRichard Maw <richard.maw@codethink.co.uk>2012-01-17 14:43:55 +0000
committerRichard Maw <richard.maw@codethink.co.uk>2012-01-17 14:43:55 +0000
commit2de9abc5c9d40b3c716307d67d16146f823fd554 (patch)
tree6979db67934ddc8b564150b465846a383b428ff8 /gnulib/lib/readlinkat.c
parent33cc1c6fda6e72a7bae1401e9b2cec495a4d3ff1 (diff)
downloadpatch-baserock/bootstrap.tar.gz
Diffstat (limited to 'gnulib/lib/readlinkat.c')
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-rw-r--r--gnulib/lib/readlinkat.c47
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diff --git a/gnulib b/gnulib
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-Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1
diff --git a/gnulib/lib/readlinkat.c b/gnulib/lib/readlinkat.c
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+/* Read a symlink relative to an open directory.
+ Copyright (C) 2009-2011 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* written by Eric Blake */
+
+#include <config.h>
+
+#include <unistd.h>
+
+/* Gnulib provides a readlink stub for mingw; use it for distinction
+ between EINVAL and ENOENT, rather than always failing with ENOSYS. */
+
+/* POSIX 2008 says that unlike readlink, readlinkat returns 0 for
+ success instead of the buffer length. But this would render
+ readlinkat worthless since readlink does not guarantee a
+ NUL-terminated buffer. Assume this was a bug in POSIX. */
+
+/* Read the contents of symlink FILE into buffer BUF of size LEN, in the
+ directory open on descriptor FD. If possible, do it without changing
+ the working directory. Otherwise, resort to using save_cwd/fchdir,
+ then readlink/restore_cwd. If either the save_cwd or the restore_cwd
+ fails, then give a diagnostic and exit nonzero. */
+
+#define AT_FUNC_NAME readlinkat
+#define AT_FUNC_F1 readlink
+#define AT_FUNC_POST_FILE_PARAM_DECLS , char *buf, size_t len
+#define AT_FUNC_POST_FILE_ARGS , buf, len
+#define AT_FUNC_RESULT ssize_t
+#include "at-func.c"
+#undef AT_FUNC_NAME
+#undef AT_FUNC_F1
+#undef AT_FUNC_POST_FILE_PARAM_DECLS
+#undef AT_FUNC_POST_FILE_ARGS
+#undef AT_FUNC_RESULT