1  /* The proper definitions for Linux/MIPS's sigaction.
       2     Copyright (C) 1993-2023 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  /* Structure describing the action to be taken when a signal arrives.  */
      27  struct sigaction
      28    {
      29      /* Special flags.  */
      30      int sa_flags;
      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      /* Additional set of signals to be blocked.  */
      48      __sigset_t sa_mask;
      49  
      50      /* The ABI says here are two unused ints following. */
      51      /* Restore handler.  */
      52      void (*sa_restorer) (void);
      53  
      54  #if _MIPS_SZPTR < 64
      55      int sa_resv[1];
      56  #endif
      57    };
      58  
      59  /* Bits in `sa_flags'.  */
      60  /* Please note that some Linux kernels versions use different values for these
      61     flags which is a bug in those kernel versions.  */
      62  #define SA_NOCLDSTOP  0x00000001 /* Don't send SIGCHLD when children stop.  */
      63  #define SA_NOCLDWAIT  0x00010000 /* Don't create zombie on child death.  */
      64  #define SA_SIGINFO    0x00000008 /* Invoke signal-catching function with
      65  				    three arguments instead of one.  */
      66  #if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
      67  # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
      68  #endif
      69  #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
      70  # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
      71  # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
      72  # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
      73  				    its handler is being executed.  */
      74  #endif
      75  #ifdef __USE_MISC
      76  # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
      77  
      78  /* Some aliases for the SA_ constants.  */
      79  # define SA_NOMASK    SA_NODEFER
      80  # define SA_ONESHOT   SA_RESETHAND
      81  # define SA_STACK     SA_ONSTACK
      82  #endif
      83  
      84  /* Values for the HOW argument to `sigprocmask'.  */
      85  #define SIG_NOP	      0		/* 0 is unused to catch errors */
      86  #define	SIG_BLOCK     1		/* Block signals.  */
      87  #define	SIG_UNBLOCK   2		/* Unblock signals.  */
      88  #define	SIG_SETMASK   3		/* Set the set of blocked signals.  */
      89  #ifdef __USE_MISC
      90  # define SIG_SETMASK32 256	/* Goodie from SGI for BSD compatibility:
      91  				   set only the low 32 bit of the sigset.  */
      92  #endif
      93  
      94  #endif