The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/sigaction.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/sigaction.h

     1	/* The proper definitions for Linux's sigaction.
     2	   Copyright (C) 1993-2024 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	    /* Signal handler.  */
    30	#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
    31	    union
    32	      {
    33		/* Used if SA_SIGINFO is not set.  */
    34		__sighandler_t sa_handler;
    35		/* Used if SA_SIGINFO is set.  */
    36		void (*sa_sigaction) (int, siginfo_t *, void *);
    37	      }
    38	    __sigaction_handler;
    39	# define sa_handler	__sigaction_handler.sa_handler
    40	# define sa_sigaction	__sigaction_handler.sa_sigaction
    41	#else
    42	    __sighandler_t sa_handler;
    43	#endif
    44	
    45	    /* Additional set of signals to be blocked.  */
    46	    __sigset_t sa_mask;
    47	
    48	    /* Special flags.  */
    49	    int sa_flags;
    50	
    51	    /* Restore handler.  */
    52	    void (*sa_restorer) (void);
    53	  };
    54	
    55	/* Bits in `sa_flags'.  */
    56	#define	SA_NOCLDSTOP  1		 /* Don't send SIGCHLD when children stop.  */
    57	#define SA_NOCLDWAIT  2		 /* Don't create zombie on child death.  */
    58	#define SA_SIGINFO    4		 /* Invoke signal-catching function with
    59					    three arguments instead of one.  */
    60	#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
    61	# define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
    62	#endif
    63	#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
    64	# define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
    65	# define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
    66					    its handler is being executed.  */
    67	# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
    68	#endif
    69	#ifdef __USE_MISC
    70	# define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
    71	
    72	/* Some aliases for the SA_ constants.  */
    73	# define SA_NOMASK    SA_NODEFER
    74	# define SA_ONESHOT   SA_RESETHAND
    75	# define SA_STACK     SA_ONSTACK
    76	#endif
    77	
    78	/* Values for the HOW argument to `sigprocmask'.  */
    79	#define	SIG_BLOCK     0		 /* Block signals.  */
    80	#define	SIG_UNBLOCK   1		 /* Unblock signals.  */
    81	#define	SIG_SETMASK   2		 /* Set the set of blocked signals.  */
    82	
    83	#endif