/usr/alpha-linux-gnu/include/sys/ucontext.h is in libc6.1-dev-alpha-cross 2.23-0ubuntu3cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | /* Copyright (C) 1998-2016 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, see
   <http://www.gnu.org/licenses/>.  */
#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H	1
#include <features.h>
#include <signal.h>
#include <bits/sigcontext.h>
/* Type for general register.  */
typedef long int greg_t;
/* Number of general registers.  */
#define NGREG	33
/* Container for all general registers.  */
typedef greg_t gregset_t[NGREG];
/* Type for floating-point register.  */
typedef long int fpreg_t;
/* Number of general registers.  */
#define NFPREG	32
/* Container for all general registers.  */
typedef fpreg_t fpregset_t[NFPREG];
/* A machine context is exactly a sigcontext.  */
typedef struct sigcontext mcontext_t;
/* Userlevel context.  */
typedef struct ucontext
  {
    unsigned long int uc_flags;
    struct ucontext *uc_link;
    unsigned long __uc_osf_sigmask;
    stack_t uc_stack;
    mcontext_t uc_mcontext;
    __sigset_t uc_sigmask;
  } ucontext_t;
#endif /* sys/ucontext.h */
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