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-rw-r--r--lib/openat.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/openat.c b/lib/openat.c
new file mode 100644
index 000000000..66da3c82a
--- /dev/null
+++ b/lib/openat.c
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+/* provide a replacement openat function
+ Copyright (C) 2004 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 2, 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, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+/* Disable the definition of openat to rpl_openat (from config.h) in this
+ file. Otherwise, we'd get conflicting prototypes for rpl_openat on
+ most systems. */
+#undef openat
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include "openat.h"
+
+#include "error.h"
+#include "save-cwd.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+// FIXME
+// int openat (int fildes, const char *path, int oflag, /* mode_t mode */...);
+
+/* Replacement for Solaris' openat function.
+ Simulate it by doing save_cwd/fchdir/open/restore_cwd.
+ If either the fchdir or the restore_cwd fails, then exit nonzero. */
+int
+rpl_openat (int fd, char const *filename, int flags)
+{
+ struct saved_cwd saved_cwd;
+ int saved_errno = 0;
+ int new_fd;
+
+ if (fd == AT_FDCWD || *filename == '/')
+ return open (filename, flags);
+
+ if (save_cwd (&saved_cwd) != 0)
+ error (EXIT_FAILURE, errno,
+ _("openat: unable to record current working directory"));
+ if (fchdir (fd) != 0)
+ {
+ free_cwd (&saved_cwd);
+ return -1;
+ }
+
+ new_fd = open (filename, flags);
+ if (new_fd < 0)
+ saved_errno = errno;
+
+ if (restore_cwd (&saved_cwd) != 0)
+ error (EXIT_FAILURE, errno,
+ _("openat: unable to restore working directory"));
+ errno = saved_errno;
+
+ return new_fd;
+}