1  /* Definitions for 31 & 64 bit S/390 sigaction.
       2     Copyright (C) 2001-2023 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  #ifndef _BITS_SIGACTION_H
      20  #define _BITS_SIGACTION_H 1
      21  
      22  #ifndef _SIGNAL_H
      23  # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
      24  #endif
      25  
      26  #include <bits/wordsize.h>
      27  
      28  #if __WORDSIZE == 64
      29  /* Structure describing the action to be taken when a signal arrives.  */
      30  struct sigaction
      31    {
      32      /* Signal handler.	*/
      33  #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
      34      union
      35        {
      36  	/* Used if SA_SIGINFO is not set.  */
      37  	__sighandler_t sa_handler;
      38  	/* Used if SA_SIGINFO is set.  */
      39  	void (*sa_sigaction) (int, siginfo_t *, void *);
      40        }
      41      __sigaction_handler;
      42  # define sa_handler	__sigaction_handler.sa_handler
      43  # define sa_sigaction	__sigaction_handler.sa_sigaction
      44  #else
      45      __sighandler_t sa_handler;
      46  #endif
      47  
      48      /* Special flags.  */
      49      int __glibc_reserved0;
      50      int sa_flags;
      51  
      52      /* Restore handler.  */
      53      void (*sa_restorer) (void);
      54  
      55      /* Additional set of signals to be blocked.	 */
      56      __sigset_t sa_mask;
      57    };
      58  #else
      59  /* Structure describing the action to be taken when a signal arrives.  */
      60  struct sigaction
      61    {
      62      /* Signal handler.  */
      63  #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
      64      union
      65        {
      66  	/* Used if SA_SIGINFO is not set.  */
      67  	__sighandler_t sa_handler;
      68  	/* Used if SA_SIGINFO is set.  */
      69  	void (*sa_sigaction) (int, siginfo_t *, void *);
      70        }
      71      __sigaction_handler;
      72  # define sa_handler	__sigaction_handler.sa_handler
      73  # define sa_sigaction	__sigaction_handler.sa_sigaction
      74  #else
      75      __sighandler_t sa_handler;
      76  #endif
      77  
      78      /* Additional set of signals to be blocked.  */
      79      __sigset_t sa_mask;
      80  
      81      /* Special flags.  */
      82      int sa_flags;
      83  
      84      /* Restore handler.  */
      85      void (*sa_restorer) (void);
      86    };
      87  #endif
      88  
      89  /* Bits in `sa_flags'.  */
      90  #define	SA_NOCLDSTOP  1		 /* Don't send SIGCHLD when children stop.  */
      91  #define SA_NOCLDWAIT  2		 /* Don't create zombie on child death.  */
      92  #define SA_SIGINFO    4		 /* Invoke signal-catching function with
      93  				    three arguments instead of one.  */
      94  #if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
      95  # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
      96  #endif
      97  #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
      98  # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
      99  # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
     100  				    its handler is being executed.	 */
     101  # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
     102  #endif
     103  #ifdef __USE_MISC
     104  # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
     105  
     106  /* Some aliases for the SA_ constants.	*/
     107  # define SA_NOMASK    SA_NODEFER
     108  # define SA_ONESHOT   SA_RESETHAND
     109  # define SA_STACK     SA_ONSTACK
     110  #endif
     111  
     112  /* Values for the HOW argument to `sigprocmask'.  */
     113  #define	SIG_BLOCK     0		 /* Block signals.  */
     114  #define	SIG_UNBLOCK   1		 /* Unblock signals.  */
     115  #define	SIG_SETMASK   2		 /* Set the set of blocked signals.  */
     116  
     117  #endif