1 files changed, 46 insertions, 0 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/fd_to_filename.h b/libc/sysdeps/unix/sysv/linux/fd_to_filename.h
new file mode 100644
index 000000000..dc1bdcc92
--- /dev/null
+++ b/libc/sysdeps/unix/sysv/linux/fd_to_filename.h
@@ -0,0 +1,46 @@
+/* Query filename corresponding to an open FD.  Linux version.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <stdio-common/_itoa.h>
+
+static inline const char *
+fd_to_filename (int fd)
+{
+  char *ret = malloc (30);
+
+  if (ret != NULL)
+    {
+      struct stat64 st;
+
+      *_fitoa_word (fd, __stpcpy (ret, "/proc/self/fd/"), 10, 0) = '\0';
+
+      /* We must make sure the file exists.  */
+      if (__lxstat64 (_STAT_VER, ret, &st) < 0)
+	{
+	  /* /proc is not mounted or something else happened.  Don't
+	     return the file name.  */
+	  free (ret);
+	  ret = NULL;
+	}
+    }
+  return ret;
+}