/* Define an at-style functions like fstatat, unlinkat, fchownat, etc.
- Copyright (C) 2006 Free Software Foundation, Inc.
+ Copyright (C) 2006, 2009 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
/* written by Jim Meyering */
-#define CALL_FUNC(F) \
- (AT_FUNC_USE_F1_COND \
+#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
+#include "openat.h"
+#include "openat-priv.h"
+#include "save-cwd.h"
+
+#ifdef AT_FUNC_USE_F1_COND
+# define CALL_FUNC(F) \
+ (flag == AT_FUNC_USE_F1_COND \
? AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS) \
: AT_FUNC_F2 (F AT_FUNC_POST_FILE_ARGS))
+# define VALIDATE_FLAG(F) \
+ if (flag & ~AT_FUNC_USE_F1_COND) \
+ { \
+ errno = EINVAL; \
+ return -1; \
+ }
+#else
+# define CALL_FUNC(F) (AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS))
+# define VALIDATE_FLAG(F) /* empty */
+#endif
-/* Call AT_FUNC_F1 or AT_FUNC_F2 (testing AT_FUNC_USE_F1_COND to
- determine which) to operate on FILE, which is in the directory
- open on descriptor FD. If possible, do it without changing the
+#ifdef AT_FUNC_RESULT
+# define FUNC_RESULT AT_FUNC_RESULT
+#else
+# define FUNC_RESULT int
+#endif
+
+/* Call AT_FUNC_F1 to operate on FILE, which is in the directory
+ open on descriptor FD. If AT_FUNC_USE_F1_COND is defined to a value,
+ AT_FUNC_POST_FILE_PARAM_DECLS must inlude a parameter named flag;
+ call AT_FUNC_F2 if FLAG is 0 or fail if FLAG contains more bits than
+ AT_FUNC_USE_F1_COND. If possible, do it without changing the
working directory. Otherwise, resort to using save_cwd/fchdir,
then AT_FUNC_F?/restore_cwd. If either the save_cwd or the restore_cwd
fails, then give a diagnostic and exit nonzero. */
-int
+FUNC_RESULT
AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS)
{
+ /* Be careful to choose names unlikely to conflict with
+ AT_FUNC_POST_FILE_PARAM_DECLS. */
struct saved_cwd saved_cwd;
int saved_errno;
- int err;
+ FUNC_RESULT err;
+
+ VALIDATE_FLAG (flag);
if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file))
return CALL_FUNC (file);
{
- char buf[OPENAT_BUFFER_SIZE];
- char *proc_file = openat_proc_name (buf, fd, file);
+ char proc_buf[OPENAT_BUFFER_SIZE];
+ char *proc_file = openat_proc_name (proc_buf, fd, file);
if (proc_file)
{
- int proc_result = CALL_FUNC (proc_file);
+ FUNC_RESULT proc_result = CALL_FUNC (proc_file);
int proc_errno = errno;
- if (proc_file != buf)
+ if (proc_file != proc_buf)
free (proc_file);
/* If the syscall succeeds, or if it fails with an unexpected
errno value, then return right away. Otherwise, fall through
return err;
}
#undef CALL_FUNC
+#undef FUNC_RESULT