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01: /* The proper definitions for Linux's sigaction.
02:    Copyright (C) 1993-1999, 2000, 2010 Free Software Foundation, Inc.
03:    This file is part of the GNU C Library.
04: 
05:    The GNU C Library is free software; you can redistribute it and/or
06:    modify it under the terms of the GNU Lesser General Public
07:    License as published by the Free Software Foundation; either
08:    version 2.1 of the License, or (at your option) any later version.
09: 
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, write to the Free
17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18:    02111-1307 USA.  */
19: 
20: #ifndef _SIGNAL_H
21: # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
22: #endif
23: 
24: /* Structure describing the action to be taken when a signal arrives.  */
25: struct sigaction
26:   {
27:     /* Signal handler.  */
28: #ifdef __USE_POSIX199309
29:     union
30:       {
31:         /* Used if SA_SIGINFO is not set.  */
32:         __sighandler_t sa_handler;
33:         /* Used if SA_SIGINFO is set.  */
34:         void (*sa_sigaction) (int, siginfo_t *, void *);
35:       }
36:     __sigaction_handler;
37: # define sa_handler     __sigaction_handler.sa_handler
38: # define sa_sigaction   __sigaction_handler.sa_sigaction
39: #else
40:     __sighandler_t sa_handler;
41: #endif
42: 
43:     /* Additional set of signals to be blocked.  */
44:     __sigset_t sa_mask;
45: 
46:     /* Special flags.  */
47:     int sa_flags;
48: 
49:     /* Restore handler.  */
50:     void (*sa_restorer) (void);
51:   };
52: 
53: /* Bits in `sa_flags'.  */
54: #define SA_NOCLDSTOP  1          /* Don't send SIGCHLD when children stop.  */
55: #define SA_NOCLDWAIT  2          /* Don't create zombie on child death.  */
56: #define SA_SIGINFO    4          /* Invoke signal-catching function with
57:                                     three arguments instead of one.  */
58: #if defined __USE_UNIX98 || defined __USE_MISC
59: # define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
60: #endif
61: #if defined __USE_UNIX98 || defined __USE_MISC || defined __USE_XOPEN2K8
62: # define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
63: # define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
64:                                     its handler is being executed.  */
65: # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
66: #endif
67: #ifdef __USE_MISC
68: # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
69: 
70: /* Some aliases for the SA_ constants.  */
71: # define SA_NOMASK    SA_NODEFER
72: # define SA_ONESHOT   SA_RESETHAND
73: # define SA_STACK     SA_ONSTACK
74: #endif
75: 
76: /* Values for the HOW argument to `sigprocmask'.  */
77: #define SIG_BLOCK     0          /* Block signals.  */
78: #define SIG_UNBLOCK   1          /* Unblock signals.  */
79: #define SIG_SETMASK   2          /* Set the set of blocked signals.  */
80: 

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