1  /* Data structures for user-level context switching.  Generic version.
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* This file's definitions suffice for any platform where all
      20     the machine-specific state is described in `struct sigcontext', but
      21     use of struct sigcontext does not conform to POSIX namespace
      22     requirements.  */
      23  
      24  #ifndef _SYS_UCONTEXT_H
      25  #define _SYS_UCONTEXT_H	1
      26  
      27  #include <features.h>
      28  
      29  #include <bits/types/sigset_t.h>
      30  #include <bits/sigcontext.h>
      31  #include <bits/types/stack_t.h>
      32  
      33  
      34  typedef struct sigcontext mcontext_t;
      35  
      36  #ifdef __USE_MISC
      37  # define __ctx(fld) fld
      38  #else
      39  # define __ctx(fld) __ ## fld
      40  #endif
      41  
      42  /* Userlevel context.  */
      43  typedef struct ucontext_t
      44    {
      45      unsigned long int __ctx(uc_flags);
      46      struct ucontext_t *uc_link;
      47      stack_t uc_stack;
      48      mcontext_t uc_mcontext;
      49      sigset_t uc_sigmask;
      50    } ucontext_t;
      51  
      52  #undef __ctx
      53  
      54  #endif /* sys/ucontext.h */