Add support for name_to_handle_at and open_by_handle.

10 files changed, 297 insertions, 38 deletions

diff --git a/ChangeLog b/ChangeLog
index b9c96d2c2a..c63d3ef50a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,18 @@
 2011-04-01  Ulrich Drepper  <drepper@gmail.com>
 
+	* sysdeps/unix/sysv/linux/Versions [GLIBC_2.14] (name_to_handle_at,
+	open_by_handle): Add.
+	* sysdeps/unix/sysv/linux/i386/bits/fcntl.h: Define struct file_handle
+	and MAX_HANDLE_SZ.  Declare name_to_handle_at and open_by_handle.
+	Augment a few comments.
+	* sysdeps/unix/sysv/linux/ia64/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/sh/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/syscalls.list: Add name_to_handle_at and
+	open_by_handle.
+
 	* io/fcntl.h (AT_EMPTY_PATH): Define.
 
 2011-03-30  Ulrich Drepper  <drepper@gmail.com>
diff --git a/NEWS b/NEWS
index eba3e8b435..54257ac894 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,4 @@
-GNU C Library NEWS -- history of user-visible changes.  2011-3-30
+GNU C Library NEWS -- history of user-visible changes.  2011-4-1
 Copyright (C) 1992-2009, 2010, 2011 Free Software Foundation, Inc.
 See the end for copying conditions.
 
@@ -7,7 +7,7 @@ using `glibc' in the "product" field.
 
 Version 2.14
 
-* New Linux interfaces: clock_adjtime
+* New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle
 
 * The following bugs are resolved with this release:
 
diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions
index 24ea75e1ac..52d0cde118 100644
--- a/sysdeps/unix/sysv/linux/Versions
+++ b/sysdeps/unix/sysv/linux/Versions
@@ -156,6 +156,8 @@ libc {
   }
   GLIBC_2.14 {
     clock_adjtime;
+
+    name_to_handle_at; open_by_handle;
   }
   GLIBC_PRIVATE {
     # functions used in other libraries
diff --git a/sysdeps/unix/sysv/linux/i386/bits/fcntl.h b/sysdeps/unix/sysv/linux/i386/bits/fcntl.h
index 944a3209be..51a18c2af2 100644
--- a/sysdeps/unix/sysv/linux/i386/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/i386/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux.
-   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004, 2006, 2007, 2009, 2010
+   Copyright (C) 1995-1998, 2000, 2004, 2006, 2007, 2009, 2010, 2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -232,6 +232,19 @@ struct f_owner_ex
 					   we splice from/to).  */
 # define SPLICE_F_MORE		4	/* Expect more data.  */
 # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
 #endif
 
 __BEGIN_DECLS
@@ -248,20 +261,32 @@ extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 			    unsigned int __flags);
 
 
-/* Splice address range into a pipe.  */
+/* Splice address range into a pipe.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 			 size_t __count, unsigned int __flags);
 
-/* Splice two files together.  */
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 		       __off64_t *__offout, size_t __len,
 		       unsigned int __flags);
 
-/* In-kernel implementation of tee for pipe buffers.  */
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 		    unsigned int __flags);
 
-/* Reserve storage for the data of the file associated with FD.  */
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 # ifndef __USE_FILE_OFFSET64
 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 # else
@@ -278,6 +303,19 @@ extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 			__off64_t __len);
 # endif
 
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle (int __mountdirfd, struct file_handle *__handle,
+			   int __flags);
+
 #endif
 
 __END_DECLS
diff --git a/sysdeps/unix/sysv/linux/ia64/bits/fcntl.h b/sysdeps/unix/sysv/linux/ia64/bits/fcntl.h
index 2189a97228..0421d14bd3 100644
--- a/sysdeps/unix/sysv/linux/ia64/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/ia64/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux/IA64.
-   Copyright (C) 1999, 2000, 2004, 2006, 2007, 2009, 2010
+   Copyright (C) 1999, 2000, 2004, 2006, 2007, 2009, 2010, 2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -227,6 +227,19 @@ struct f_owner_ex
 					   we splice from/to).  */
 # define SPLICE_F_MORE		4	/* Expect more data.  */
 # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
 #endif
 
 __BEGIN_DECLS
@@ -238,25 +251,40 @@ extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
     __THROW;
 
 
-/* Selective file content synch'ing.  */
+/* Selective file content synch'ing.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 			    unsigned int __flags);
 
 
-/* Splice address range into a pipe.  */
+/* Splice address range into a pipe.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 			 size_t __count, unsigned int __flags);
 
-/* Splice two files together.  */
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 		       __off64_t *__offout, size_t __len,
 		       unsigned int __flags);
 
-/* In-kernel implementation of tee for pipe buffers.  */
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 		    unsigned int __flags);
 
-/* Reserve storage for the data of the file associated with FD.  */
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 # ifndef __USE_FILE_OFFSET64
 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 # else
@@ -273,6 +301,19 @@ extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 			__off64_t __len);
 # endif
 
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle (int __mountdirfd, struct file_handle *__handle,
+			   int __flags);
+
 #endif
 
 __END_DECLS
diff --git a/sysdeps/unix/sysv/linux/s390/bits/fcntl.h b/sysdeps/unix/sysv/linux/s390/bits/fcntl.h
index 05c7a3ba82..4226b9c9ac 100644
--- a/sysdeps/unix/sysv/linux/s390/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/s390/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux.
-   Copyright (C) 2000-2002,2004,2006,2007,2009,2010
+   Copyright (C) 2000-2002,2004,2006,2007,2009,2010,2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -253,6 +253,19 @@ struct f_owner_ex
 					   we splice from/to).  */
 # define SPLICE_F_MORE		4	/* Expect more data.  */
 # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
 #endif
 
 __BEGIN_DECLS
@@ -264,25 +277,40 @@ extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
     __THROW;
 
 
-/* Selective file content synch'ing.  */
+/* Selective file content synch'ing.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 			    unsigned int __flags);
 
 
-/* Splice address range into a pipe.  */
+/* Splice address range into a pipe.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 			 size_t __count, unsigned int __flags);
 
-/* Splice two files together.  */
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 		       __off64_t *__offout, size_t __len,
 		       unsigned int __flags);
 
-/* In-kernel implementation of tee for pipe buffers.  */
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 		    unsigned int __flags);
 
-/* Reserve storage for the data of the file associated with FD.  */
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 # ifndef __USE_FILE_OFFSET64
 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 # else
@@ -299,6 +327,19 @@ extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 			__off64_t __len);
 # endif
 
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle (int __mountdirfd, struct file_handle *__handle,
+			   int __flags);
+
 #endif
 
 __END_DECLS
diff --git a/sysdeps/unix/sysv/linux/sh/bits/fcntl.h b/sysdeps/unix/sysv/linux/sh/bits/fcntl.h
index df21f6af42..35f30f9e7b 100644
--- a/sysdeps/unix/sysv/linux/sh/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/sh/bits/fcntl.h
@@ -1,5 +1,5 @@
-/* O_*, F_*, FD_* bit values for Linux.
-   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004, 2006, 2007, 2009, 2010
+/* O_*, F_*, FD_* bit values for Linux/SH.
+   Copyright (C) 1995-1998, 2000, 2004, 2006, 2007, 2009, 2010, 2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -233,6 +233,19 @@ struct f_owner_ex
 					   we splice from/to).  */
 # define SPLICE_F_MORE		4	/* Expect more data.  */
 # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
 #endif
 
 __BEGIN_DECLS
@@ -244,25 +257,40 @@ extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
     __THROW;
 
 
-/* Selective file content synch'ing.  */
+/* Selective file content synch'ing.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 			    unsigned int __flags);
 
 
-/* Splice address range into a pipe.  */
+/* Splice address range into a pipe.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 			 size_t __count, unsigned int __flags);
 
-/* Splice two files together.  */
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 		       __off64_t *__offout, size_t __len,
 		       unsigned int __flags);
 
-/* In-kernel implementation of tee for pipe buffers.  */
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 		    unsigned int __flags);
 
-/* Reserve storage for the data of the file associated with FD.  */
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 # ifndef __USE_FILE_OFFSET64
 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 # else
@@ -279,6 +307,19 @@ extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 			__off64_t __len);
 # endif
 
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle (int __mountdirfd, struct file_handle *__handle,
+			   int __flags);
+
 #endif
 
 __END_DECLS
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h b/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h
index bf8f3d60e9..468b8cf8d9 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux/SPARC.
-   Copyright (C) 1995-1998, 2000, 2003, 2004, 2006, 2007, 2009, 2010
+   Copyright (C) 1995-1998, 2000, 2003, 2004, 2006, 2007, 2009, 2010, 2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -243,6 +243,19 @@ struct f_owner_ex
 					   we splice from/to).  */
 # define SPLICE_F_MORE		4	/* Expect more data.  */
 # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
 #endif
 
 __BEGIN_DECLS
@@ -254,7 +267,10 @@ extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
     __THROW;
 
 
-/* Selective file content synch'ing.  */
+/* Selective file content synch'ing.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 			    unsigned int __flags);
 
@@ -263,16 +279,25 @@ extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 			 size_t __count, unsigned int __flags);
 
-/* Splice two files together.  */
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 		       __off64_t *__offout, size_t __len,
 		       unsigned int __flags);
 
-/* In-kernel implementation of tee for pipe buffers.  */
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 		    unsigned int __flags);
 
-/* Reserve storage for the data of the file associated with FD.  */
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 # ifndef __USE_FILE_OFFSET64
 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 # else
@@ -289,6 +314,19 @@ extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 			__off64_t __len);
 # endif
 
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle (int __mountdirfd, struct file_handle *__handle,
+			   int __flags);
+
 #endif
 
 __END_DECLS
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index 03c784b492..ed2d5f61c0 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -104,3 +104,6 @@ timerfd_settime	EXTRA	timerfd_settime	i:iipp	timerfd_settime
 timerfd_gettime	EXTRA	timerfd_gettime	i:ip	timerfd_gettime
 
 fanotify_init	EXTRA	fanotify_init	i:ii	fanotify_init
+
+name_to_handle_at EXTRA	name_to_handle_at i:isppi name_to_handle_at
+open_by_handle	EXTRA	open_by_handle	Ci:ipi	open_by_handle
diff --git a/sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h b/sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h
index ac029fddae..925c813cb7 100644
--- a/sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux/x86-64.
-   Copyright (C) 2001,2002,2004,2006,2007,2009,2010
+   Copyright (C) 2001,2002,2004,2006,2007,2009,2010,2011
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -247,6 +247,19 @@ struct f_owner_ex
 					   we splice from/to).  */
 # define SPLICE_F_MORE		4	/* Expect more data.  */
 # define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
 #endif
 
 __BEGIN_DECLS
@@ -258,25 +271,40 @@ extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
     __THROW;
 
 
-/* Selective file content synch'ing.  */
+/* Selective file content synch'ing.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
 			    unsigned int __flags);
 
 
-/* Splice address range into a pipe.  */
+/* Splice address range into a pipe.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
 			 size_t __count, unsigned int __flags);
 
-/* Splice two files together.  */
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
 		       __off64_t *__offout, size_t __len,
 		       unsigned int __flags);
 
-/* In-kernel implementation of tee for pipe buffers.  */
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 extern ssize_t tee (int __fdin, int __fdout, size_t __len,
 		    unsigned int __flags);
 
-/* Reserve storage for the data of the file associated with FD.  */
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
 # ifndef __USE_FILE_OFFSET64
 extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
 # else
@@ -292,6 +320,20 @@ extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset,
 extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
 			__off64_t __len);
 # endif
-#endif
+
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle (int __mountdirfd, struct file_handle *__handle,
+			   int __flags);
+
+#endif	/* use GNU */
 
 __END_DECLS