Re-install F_[GS]ETOWN_EX changes

11 files changed, 252 insertions, 26 deletions

diff --git a/ChangeLog b/ChangeLog
index 19a8e2fd48..aaa01cb937 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -233,6 +233,22 @@ d2009-10-30  Ulrich Drepper  <drepper@redhat.com>
 	* sysdeps/generic/netinet/ip.h: Define IPTOS_ENC* and IPTOS_DSCP*
 	macros.  Patch by Philip Prindeville <philipp@redfish-solutions.com>.
 
+	[BZ #10840]
+	* sysdeps/unix/sysv/linux/kernel-features.h: Define
+	__ASSUME_F_GETOWN_EX.
+	* sysdeps/unix/sysv/linux/fcntl.c: Implement F_GETOWN using F_GETOWN_EX
+	if possible.
+	* sysdeps/unix/sysv/linux/i386/fcntl.c: Likewise.
+
+	* sysdeps/unix/sysv/linux/sh/bits/fcntl.h: Define F_OWNER_*
+	and f_owner_ex.
+	* sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/i386/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/bits/fcntl.h: Likewise.
+
 	[BZ #10847]
 	* sysdeps/gnu/getutmp.c: Allow compatibility code to play around with
 	getutmpx symbol.
@@ -320,6 +336,17 @@ d2009-10-30  Ulrich Drepper  <drepper@redhat.com>
 	* locale/C-time.c: Revert week-1stday back to 19971130 and set
 	first_weekday to 1 and first_workday to 2.
 
+2009-10-01  Ulrich Drepper  <drepper@redhat.com>
+
+	* sysdeps/unix/sysv/linux/sh/bits/fcntl.h: Define F_SETOWN_EX and
+	F_GETOWN_EX.
+	* sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/i386/bits/fcntl.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/bits/fcntl.h: Likewise.
+
 2009-09-28  Andreas Schwab  <schwab@redhat.com>
 
 	* stdio-common/printf_fp.c: Check for and avoid integer overflows.
diff --git a/sysdeps/unix/sysv/linux/fcntl.c b/sysdeps/unix/sysv/linux/fcntl.c
index 1f5aca14a4..b19654c625 100644
--- a/sysdeps/unix/sysv/linux/fcntl.c
+++ b/sysdeps/unix/sysv/linux/fcntl.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2000, 2002, 2003, 2004, 2009 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
@@ -23,6 +23,40 @@
 #include <stdarg.h>
 
 #include <sys/syscall.h>
+#include <kernel-features.h>
+
+
+#ifdef __ASSUME_F_GETOWN_EX
+# define miss_F_GETOWN_EX 0
+#else
+static int miss_F_GETOWN_EX;
+#endif
+
+
+static int
+do_fcntl (int fd, int cmd, void *arg)
+{
+  if (cmd != F_GETOWN || miss_F_GETOWN_EX)
+    return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+
+  INTERNAL_SYSCALL_DECL (err);
+  struct f_owner_ex fex;
+  int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex);
+  if (!INTERNAL_SYSCALL_ERROR_P (res, err))
+    return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
+
+#ifndef __ASSUME_F_GETOWN_EX
+  if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
+    {
+      res = INLINE_SYSCALL (fcntl, 3, fd, F_GETOWN, arg);
+      miss_F_GETOWN_EX = 1;
+      return res;
+    }
+#endif
+
+  __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
+  return -1;
+}
 
 
 #ifndef NO_CANCELLATION
@@ -36,7 +70,7 @@ __fcntl_nocancel (int fd, int cmd, ...)
   arg = va_arg (ap, void *);
   va_end (ap);
 
-  return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+  return do_fcntl (fd, cmd, arg);
 }
 #endif
 
@@ -52,11 +86,11 @@ __libc_fcntl (int fd, int cmd, ...)
   va_end (ap);
 
   if (SINGLE_THREAD_P || cmd != F_SETLKW)
-    return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+    return do_fcntl (fd, cmd, arg);
 
   int oldtype = LIBC_CANCEL_ASYNC ();
 
-  int result = INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+  int result = do_fcntl (fd, cmd, arg);
 
   LIBC_CANCEL_RESET (oldtype);
 
diff --git a/sysdeps/unix/sysv/linux/i386/bits/fcntl.h b/sysdeps/unix/sysv/linux/i386/bits/fcntl.h
index 35dfb299d2..6a38dc03fe 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
+   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004, 2006, 2007, 2009
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -85,13 +85,15 @@
 #define F_SETLKW64	14	/* Set record locking info (blocking).	*/
 
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
-# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+# define F_SETOWN	8	/* Get owner (process receiving SIGIO).  */
+# define F_GETOWN	9	/* Set owner (process receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	12	/* Get owner (thread receiving SIGIO).  */
+# define F_GETOWN_EX	13	/* Set owner (thread receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -166,6 +168,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
 #ifdef	__USE_BSD
diff --git a/sysdeps/unix/sysv/linux/i386/fcntl.c b/sysdeps/unix/sysv/linux/i386/fcntl.c
index b27373d24b..5544d6e0d9 100644
--- a/sysdeps/unix/sysv/linux/i386/fcntl.c
+++ b/sysdeps/unix/sysv/linux/i386/fcntl.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000,2002,2003,2004,2006 Free Software Foundation, Inc.
+/* Copyright (C) 2000,2002,2003,2004,2006,2009 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
@@ -30,6 +30,13 @@
 int __have_no_fcntl64;
 #endif
 
+#ifdef __ASSUME_F_GETOWN_EX
+# define miss_F_GETOWN_EX 0
+#else
+static int miss_F_GETOWN_EX;
+#endif
+
+
 #if defined NO_CANCELLATION && __ASSUME_FCNTL64 == 0
 # define __fcntl_nocancel  __libc_fcntl
 #endif
@@ -119,6 +126,26 @@ __fcntl_nocancel (int fd, int cmd, ...)
 	assert (F_SETLK - F_SETLKW == F_SETLK64 - F_SETLKW64);
 	return INLINE_SYSCALL (fcntl, 3, fd, cmd + F_SETLK - F_SETLK64, &fl);
       }
+    case F_GETOWN:
+      if (! miss_F_GETOWN_EX)
+	{
+	  INTERNAL_SYSCALL_DECL (err);
+	  struct f_owner_ex fex;
+	  int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex);
+	  if (!INTERNAL_SYSCALL_ERROR_P (res, err))
+	    return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
+
+#ifndef __ASSUME_F_GETOWN_EX
+	  if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
+	    miss_F_GETOWN_EX = 1;
+	  else
+#endif
+	    {
+	      __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
+	      return -1;
+	    }
+	}
+      /* FALLTHROUGH */
     default:
       return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
     }
diff --git a/sysdeps/unix/sysv/linux/ia64/bits/fcntl.h b/sysdeps/unix/sysv/linux/ia64/bits/fcntl.h
index 92b96bd14c..9a0245a6c4 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 Free Software Foundation, Inc.
+   Copyright (C) 1999,2000,2004,2006,2007,2009 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
@@ -81,13 +81,15 @@
 #define F_SETLKW64	7	/* Set record locking info (blocking).	*/
 
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
-# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+# define F_SETOWN	8	/* Get owner (process receiving SIGIO).  */
+# define F_GETOWN	9	/* Set owner (process receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	12	/* Get owner (thread receiving SIGIO).  */
+# define F_GETOWN_EX	13	/* Set owner (thread receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -159,6 +161,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index ff065effb5..f48e644e09 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -542,3 +542,8 @@
 # define __ASSUME_PREADV	1
 # define __ASSUME_PWRITEV	1
 #endif
+
+/* Support for F_GETOWN_EX was introduced in 2.6.32.  */
+#if __LINUX_KERNEL_VERSION >= 0x020620
+# define __ASSUME_F_GETOWN_EX	1
+#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h b/sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h
index 493d5cba5f..6c4b66b7ac 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux/PowerPC.
-   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2003, 2004, 2006, 2007
+   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2003, 2004, 2006, 2007, 2009
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -85,13 +85,15 @@
 #define F_SETLKW64	14	/* Set record locking info (blocking).	*/
 
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
-# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+# define F_SETOWN	8	/* Get owner (process receiving of SIGIO).  */
+# define F_GETOWN	9	/* Set owner (process receiving of SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	12	/* Get owner (thread receiving SIGIO).  */
+# define F_GETOWN_EX	13	/* Set owner (thread receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -166,6 +168,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
 #ifdef	__USE_BSD
diff --git a/sysdeps/unix/sysv/linux/s390/bits/fcntl.h b/sysdeps/unix/sysv/linux/s390/bits/fcntl.h
index 54c4c52751..d3dddbc368 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) 2000,2001,2002,2004,2006,2007 Free Software Foundation, Inc.
+   Copyright (C) 2000,2001,2002,2004,2006,2007,2009 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
@@ -100,13 +100,15 @@
 #endif
 
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
-# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+# define F_SETOWN	8	/* Get owner (process receiving SIGIO).  */
+# define F_GETOWN	9	/* Set owner (process receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	12	/* Get owner (thread receiving SIGIO).  */
+# define F_GETOWN_EX	13	/* Set owner (thread receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -181,6 +183,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
 #ifdef	__USE_BSD
diff --git a/sysdeps/unix/sysv/linux/sh/bits/fcntl.h b/sysdeps/unix/sysv/linux/sh/bits/fcntl.h
index 35dfb299d2..d7a21ea2e2 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
+   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004, 2006, 2007, 2009
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -85,13 +85,15 @@
 #define F_SETLKW64	14	/* Set record locking info (blocking).	*/
 
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
-# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+# define F_SETOWN	8	/* Get owner (process receiving of SIGIO).  */
+# define F_GETOWN	9	/* Set owner (process receiving of SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	12	/* Get owner (thread receiving of SIGIO).  */
+# define F_GETOWN_EX	13	/* Set owner (thread receiving of SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -166,6 +168,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
 #ifdef	__USE_BSD
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h b/sysdeps/unix/sysv/linux/sparc/bits/fcntl.h
index 56d9c004e7..dfa848a377 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, 1996, 1997, 1998, 2000, 2003, 2004, 2006, 2007
+   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2003, 2004, 2006, 2007, 2009
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -83,8 +83,8 @@
 #define F_GETFL		3	/* Get file status flags.  */
 #define F_SETFL		4	/* Set file status flags.  */
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_GETOWN	5	/* Get owner of socket (receiver of SIGIO).  */
-# define F_SETOWN	6	/* Set owner of socket (receiver of SIGIO).  */
+# define F_GETOWN	5	/* Get owner (process receiving SIGIO).  */
+# define F_SETOWN	6	/* Set owner (process receiving SIGIO).  */
 #endif
 #ifndef __USE_FILE_OFFSET64
 # define F_GETLK	7	/* Get record locking info.  */
@@ -99,6 +99,8 @@
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_GETOWN_EX	12	/* Get owner (thread receiving SIGIO).  */
+# define F_SETOWN_EX	13	/* Set owner (thread receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -185,6 +187,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
 #ifdef	__USE_BSD
diff --git a/sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h b/sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h
index 1d68a201a5..c3eb859e7d 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 Free Software Foundation, Inc.
+   Copyright (C) 2001,2002,2004,2006,2007,2009 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
@@ -99,13 +99,15 @@
 #endif
 
 #if defined __USE_BSD || defined __USE_UNIX98
-# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
-# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+# define F_SETOWN	8	/* Get owner (process receiving of SIGIO).  */
+# define F_GETOWN	9	/* Set owner (process receiving of SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
 # define F_SETSIG	10	/* Set number of signal to be sent.  */
 # define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	12	/* Get owner (thread receiving SIGIO).  */
+# define F_GETOWN_EX	13	/* Set owner (thread receiving SIGIO).  */
 #endif
 
 #ifdef __USE_GNU
@@ -180,6 +182,23 @@ struct flock64
   };
 #endif
 
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,	/* Kernel thread.  */
+    F_OWNER_PID,	/* Process.  */
+    F_OWNER_GID		/* Process group.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
 /* Define some more compatibility macros to be backward compatible with
    BSD systems which did not managed to hide these kernel macros.  */
 #ifdef	__USE_BSD