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Diffstat (limited to 'sysdeps/generic/fd_to_filename.h')
-rw-r--r--sysdeps/generic/fd_to_filename.h26
1 files changed, 18 insertions, 8 deletions
diff --git a/sysdeps/generic/fd_to_filename.h b/sysdeps/generic/fd_to_filename.h
index eff6ca211b..5ca22f02bc 100644
--- a/sysdeps/generic/fd_to_filename.h
+++ b/sysdeps/generic/fd_to_filename.h
@@ -1,4 +1,4 @@
-/* Query filename corresponding to an open FD. Generic version.
+/* Query filename corresponding to an open FD.
Copyright (C) 2001-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -16,12 +16,22 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#define FD_TO_FILENAME_SIZE 0
+#ifndef _FD_TO_FILENAME_H
+#define _FD_TO_FILENAME_H
-/* In general there is no generic way to query filename for an open
- file descriptor. */
-static inline const char *
-fd_to_filename (int fd, char *buf)
+#include <arch-fd_to_filename.h>
+#include <intprops.h>
+
+struct fd_to_filename
{
- return NULL;
-}
+ /* A positive int value has at most 10 decimal digits. */
+ char buffer[sizeof (FD_TO_FILENAME_PREFIX) + INT_STRLEN_BOUND (int)];
+};
+
+/* Writes a /proc/self/fd-style path for DESCRIPTOR to *STORAGE and
+ returns a pointer to the start of the string. DESCRIPTOR must be
+ non-negative. */
+char *__fd_to_filename (int descriptor, struct fd_to_filename *storage)
+ attribute_hidden;
+
+#endif /* _FD_TO_FILENAME_H */