shell.h

   1 /* shell.h -- The data structures used by the shell */
   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, 675 Mass Ave, Cambridge, MA 02139, USA. */
  20
  21 #include "config.h"
  22
  23 #include "bashjmp.h"
  24
  25 #include "command.h"
  26 #include "general.h"
  27 #include "error.h"
  28 #include "variables.h"
  29 #include "quit.h"
  30 #include "maxpath.h"
  31 #include "unwind_prot.h"
  32 #include "dispose_cmd.h"
  33 #include "make_cmd.h"
  34 #include "subst.h"
  35 #include "sig.h"
  36 #include "pathnames.h"
  37 #include "externs.h"
  38
  39 extern int EOF_Reached;
  40
  41 #define NO_PIPE -1
  42 #define REDIRECT_BOTH -2
  43 #define IS_DESCRIPTOR -1
  44
  45 #define NO_VARIABLE -1
  46
  47 /* Values that can be returned by execute_command (). */
  48 #define EXECUTION_FAILURE 1
  49 #define EXECUTION_SUCCESS 0
  50
  51 /* Usage messages by builtins result in a return status of 2. */
  52 #define EX_BADUSAGE     2
  53
  54 /* Special exit statuses used by the shell, internally and externally. */
  55 #define EX_BINARY_FILE  126
  56 #define EX_NOEXEC       126
  57 #define EX_NOINPUT      126
  58 #define EX_NOTFOUND     127
  59
  60 #define EX_SHERRBASE    256     /* all special error values are > this. */
  61
  62 #define EX_BADSYNTAX    257     /* shell syntax error */
  63 #define EX_USAGE        258     /* syntax error in usage */
  64 #define EX_REDIRFAIL    259     /* redirection failed */
  65 #define EX_BADASSIGN    260     /* variable assignment error */
  66 #define EX_EXPFAIL      261     /* word expansion failed */
  67
  68 /* The list of characters that are quoted in double-quotes with a
  69    backslash.  Other characters following a backslash cause nothing
  70    special to happen. */
  71 #define slashify_in_quotes "\\`$\"\n"
  72 #define slashify_in_here_document "\\`$"
  73
  74 /* Constants which specify how to handle backslashes and quoting in
  75    expand_word_internal ().  Q_DOUBLE_QUOTES means to use the function
  76    slashify_in_quotes () to decide whether the backslash should be
  77    retained.  Q_HERE_DOCUMENT means slashify_in_here_document () to
  78    decide whether to retain the backslash.  Q_KEEP_BACKSLASH means
  79    to unconditionally retain the backslash. */
  80 #define Q_DOUBLE_QUOTES  0x1
  81 #define Q_HERE_DOCUMENT  0x2
  82 #define Q_KEEP_BACKSLASH 0x4
  83 #define Q_NOQUOTE        0x8
  84 #define Q_QUOTED         0x10
  85 #define Q_ADDEDQUOTES    0x20
  86 #define Q_QUOTEDNULL     0x40
  87
  88 /* Flag values that control parameter pattern substitution. */
  89 #define MATCH_ANY       0x0
  90 #define MATCH_BEG       0x1
  91 #define MATCH_END       0x2
  92
  93 #define MATCH_TYPEMASK  0x3
  94
  95 #define MATCH_GLOBREP   0x10
  96 #define MATCH_QUOTED    0x20
  97
  98 /* Some needed external declarations. */
  99 extern char **shell_environment;
 100 extern WORD_LIST *rest_of_args;
 101
 102 /* Generalized global variables. */
 103 extern int executing, login_shell;
 104
 105 /* Structure to pass around that holds a bitmap of file descriptors
 106    to close, and the size of that structure.  Used in execute_cmd.c. */
 107 struct fd_bitmap {
 108   long size;
 109   char *bitmap;
 110 };
 111
 112 #define FD_BITMAP_SIZE 32
 113
 114 #define CTLESC '\001'
 115 #define CTLNUL '\177'
 116
 117 /* Information about the current user. */
 118 struct user_info {
 119   int uid, euid;
 120   int gid, egid;
 121   char *user_name;
 122   char *shell;          /* shell from the password file */
 123   char *home_dir;
 124 };
 125
 126 extern struct user_info current_user;