trap.h

   1 /* trap.h -- data structures used in the trap mechanism. */
   2
   3 /* Copyright (C) 1993 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  20
  21 #if !defined (_TRAP_H_)
  22 #define _TRAP_H_
  23
  24 #include "stdc.h"
  25
  26 #if !defined (SIG_DFL)
  27 #include "bashtypes.h"
  28 #include <signal.h>
  29 #endif /* SIG_DFL */
  30
  31 #if !defined (NSIG)
  32 #define NSIG 64
  33 #endif /* !NSIG */
  34
  35 #define NO_SIG -1
  36 #define DEFAULT_SIG     SIG_DFL
  37 #define IGNORE_SIG      SIG_IGN
  38
  39 /* Special shell trap names. */
  40 #define DEBUG_TRAP      NSIG
  41 #define ERROR_TRAP      NSIG+1
  42 #define RETURN_TRAP     NSIG+2
  43 #define EXIT_TRAP       0
  44
  45 /* system signals plus special bash traps */
  46 #define BASH_NSIG       NSIG+3
  47
  48 /* Flags values for decode_signal() */
  49 #define DSIG_SIGPREFIX  0x01            /* don't alllow `SIG' PREFIX */
  50 #define DSIG_NOCASE     0x02            /* case-insensitive comparison */
  51
  52 #define signal_object_p(x,f) (decode_signal (x,f) != NO_SIG)
  53
  54 #define TRAP_STRING(s) \
  55   (signal_is_trapped (s) && signal_is_ignored (s) == 0) ? trap_list[s] \
  56                                                         : (char *)NULL
  57
  58 extern char *trap_list[];
  59
  60 /* Externally-visible functions declared in trap.c. */
  61 extern void initialize_traps __P((void));
  62
  63 extern void run_pending_traps __P((void));
  64
  65 extern void maybe_set_sigchld_trap __P((char *));
  66 extern void set_sigchld_trap __P((char *));
  67
  68 extern void set_debug_trap __P((char *));
  69 extern void set_error_trap __P((char *));
  70 extern void set_return_trap __P((char *));
  71
  72 extern void set_sigint_trap __P((char *));
  73 extern void set_signal __P((int, char *));
  74
  75 extern void restore_default_signal __P((int));
  76 extern void ignore_signal __P((int));
  77 extern int run_exit_trap __P((void));
  78 extern void run_trap_cleanup __P((int));
  79 extern int run_debug_trap __P((void));
  80 extern void run_error_trap __P((void));
  81 extern void run_return_trap __P((void));
  82
  83 extern void free_trap_strings __P((void));
  84 extern void reset_signal_handlers __P((void));
  85 extern void restore_original_signals __P((void));
  86
  87 extern char *signal_name __P((int));
  88
  89 extern int decode_signal __P((char *, int));
  90 extern void run_interrupt_trap __P((void));
  91 extern int maybe_call_trap_handler __P((int));
  92 extern int signal_is_trapped __P((int));
  93 extern int signal_is_ignored __P((int));
  94 extern int signal_is_special __P((int));
  95 extern void set_signal_ignored __P((int));
  96 extern int signal_in_progress __P((int));
  97
  98 #endif /* _TRAP_H_ */