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

   1 /* The proper definitions for Linux/MIPS's sigaction.
   2    Copyright (C) 1993-2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _SIGNAL_H
  20 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  21 #endif
  22
  23 /* Structure describing the action to be taken when a signal arrives.  */
  24 struct sigaction
  25   {
  26     /* Special flags.  */
  27     unsigned int sa_flags;
  28
  29     /* Signal handler.  */
  30 #ifdef __USE_POSIX199309
  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     /* Additional set of signals to be blocked.  */
  45     __sigset_t sa_mask;
  46
  47     /* The ABI says here are two unused ints following. */
  48     /* Restore handler.  */
  49     void (*sa_restorer) (void);
  50
  51 #if _MIPS_SZPTR < 64
  52     int sa_resv[1];
  53 #endif
  54   };
  55
  56 /* Bits in `sa_flags'.  */
  57 /* Please note that some Linux kernels versions use different values for these
  58    flags which is a bug in those kernel versions.  */
  59 #define SA_NOCLDSTOP  0x00000001 /* Don't send SIGCHLD when children stop.  */
  60 #define SA_NOCLDWAIT  0x00010000 /* Don't create zombie on child death.  */
  61 #define SA_SIGINFO    0x00000008 /* Invoke signal-catching function with
  62                                     three arguments instead of one.  */
  63 #if defined __USE_UNIX98 || defined __USE_MISC
  64 # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
  65 #endif
  66 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
  67 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
  68 # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
  69 # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
  70                                     its handler is being executed.  */
  71 #endif
  72 #ifdef __USE_MISC
  73 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  74
  75 /* Some aliases for the SA_ constants.  */
  76 # define SA_NOMASK    SA_NODEFER
  77 # define SA_ONESHOT   SA_RESETHAND
  78 # define SA_STACK     SA_ONSTACK
  79 #endif
  80
  81 /* Values for the HOW argument to `sigprocmask'.  */
  82 #define SIG_NOP       0         /* 0 is unused to catch errors */
  83 #define SIG_BLOCK     1         /* Block signals.  */
  84 #define SIG_UNBLOCK   2         /* Unblock signals.  */
  85 #define SIG_SETMASK   3         /* Set the set of blocked signals.  */
  86 #ifdef __USE_MISC
  87 # define SIG_SETMASK32 256      /* Goodie from SGI for BSD compatibility:
  88                                    set only the low 32 bit of the sigset.  */
  89 #endif