sysdeps/unix/sysv/linux/s390/bits/sigaction.h

   1 /* Definitions for 31 & 64 bit S/390 sigaction.
   2    Copyright (C) 2001-2024 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 #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