shell.h

   1 /* shell.h -- The data structures used by the shell */
   2
   3 /* Copyright (C) 1993-2002 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 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "bashjmp.h"
  26
  27 #include "command.h"
  28 #include "syntax.h"
  29 #include "general.h"
  30 #include "error.h"
  31 #include "variables.h"
  32 #include "arrayfunc.h"
  33 #include "quit.h"
  34 #include "maxpath.h"
  35 #include "unwind_prot.h"
  36 #include "dispose_cmd.h"
  37 #include "make_cmd.h"
  38 #include "ocache.h"
  39 #include "subst.h"
  40 #include "sig.h"
  41 #include "pathnames.h"
  42 #include "externs.h"
  43
  44 extern int EOF_Reached;
  45
  46 #define NO_PIPE -1
  47 #define REDIRECT_BOTH -2
  48
  49 #define NO_VARIABLE -1
  50
  51 /* Values that can be returned by execute_command (). */
  52 #define EXECUTION_FAILURE 1
  53 #define EXECUTION_SUCCESS 0
  54
  55 /* Usage messages by builtins result in a return status of 2. */
  56 #define EX_BADUSAGE     2
  57
  58 /* Special exit statuses used by the shell, internally and externally. */
  59 #define EX_BINARY_FILE  126
  60 #define EX_NOEXEC       126
  61 #define EX_NOINPUT      126
  62 #define EX_NOTFOUND     127
  63
  64 #define EX_SHERRBASE    256     /* all special error values are > this. */
  65
  66 #define EX_BADSYNTAX    257     /* shell syntax error */
  67 #define EX_USAGE        258     /* syntax error in usage */
  68 #define EX_REDIRFAIL    259     /* redirection failed */
  69 #define EX_BADASSIGN    260     /* variable assignment error */
  70 #define EX_EXPFAIL      261     /* word expansion failed */
  71
  72 /* Flag values that control parameter pattern substitution. */
  73 #define MATCH_ANY       0x000
  74 #define MATCH_BEG       0x001
  75 #define MATCH_END       0x002
  76
  77 #define MATCH_TYPEMASK  0x003
  78
  79 #define MATCH_GLOBREP   0x010
  80 #define MATCH_QUOTED    0x020
  81 #define MATCH_STARSUB   0x040
  82
  83 /* Some needed external declarations. */
  84 extern char **shell_environment;
  85 extern WORD_LIST *rest_of_args;
  86
  87 /* Generalized global variables. */
  88 extern int debugging_mode;
  89 extern int executing, login_shell;
  90 extern int interactive, interactive_shell;
  91 extern int startup_state;
  92 extern int shell_compatibility_level;
  93
  94 /* Structure to pass around that holds a bitmap of file descriptors
  95    to close, and the size of that structure.  Used in execute_cmd.c. */
  96 struct fd_bitmap {
  97   int size;
  98   char *bitmap;
  99 };
 100
 101 #define FD_BITMAP_SIZE 32
 102
 103 #define CTLESC '\001'
 104 #define CTLNUL '\177'
 105
 106 /* Information about the current user. */
 107 struct user_info {
 108   uid_t uid, euid;
 109   gid_t gid, egid;
 110   char *user_name;
 111   char *shell;          /* shell from the password file */
 112   char *home_dir;
 113 };
 114
 115 extern struct user_info current_user;
 116
 117 /* Force gcc to not clobber X on a longjmp().  Old versions of gcc mangle
 118    this badly. */
 119 #if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ > 8)
 120 #  define USE_VAR(x)    ((void) &(x))
 121 #else
 122 #  define USE_VAR(x)
 123 #endif
 124
 125 /* Structure in which to save partial parsing state when doing things like
 126    PROMPT_COMMAND and bash_execute_unix_command execution. */
 127
 128 typedef struct _sh_parser_state_t {
 129
 130   /* parsing state */
 131   int parser_state;
 132   int *token_state;
 133
 134   /* input line state -- line number saved elsewhere */
 135   int input_line_terminator;
 136   int eof_encountered;
 137
 138 #if defined (HANDLE_MULTIBYTE)
 139   /* Nothing right now for multibyte state, but might want something later. */
 140 #endif
 141
 142   /* history state affecting or modified by the parser */
 143   int current_command_line_count;
 144 #if defined (HISTORY)
 145   int remember_on_history;
 146   int history_expansion_inhibited;
 147 #endif
 148
 149   /* execution state possibly modified by the parser */
 150   int last_command_exit_value;
 151 #if defined (ARRAY_VARS)
 152   ARRAY *pipestatus;
 153 #endif
 154   sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
 155
 156   /* flags state affecting the parser */
 157   int expand_aliases;
 158   int echo_input_at_read;
 159
 160 } sh_parser_state_t;
 161
 162 /* Let's try declaring these here. */
 163 extern sh_parser_state_t *save_parser_state __P((sh_parser_state_t *));
 164 extern void restore_parser_state __P((sh_parser_state_t *));