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, 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 "subst.h"
  39 #include "sig.h"
  40 #include "pathnames.h"
  41 #include "externs.h"
  42 #include "version.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       0x0
  74 #define MATCH_BEG       0x1
  75 #define MATCH_END       0x2
  76
  77 #define MATCH_TYPEMASK  0x3
  78
  79 #define MATCH_GLOBREP   0x10
  80 #define MATCH_QUOTED    0x20
  81
  82 /* Some needed external declarations. */
  83 extern char **shell_environment;
  84 extern WORD_LIST *rest_of_args;
  85
  86 /* Generalized global variables. */
  87 extern int executing, login_shell;
  88 extern int interactive, interactive_shell;
  89
  90 /* Structure to pass around that holds a bitmap of file descriptors
  91    to close, and the size of that structure.  Used in execute_cmd.c. */
  92 struct fd_bitmap {
  93   int size;
  94   char *bitmap;
  95 };
  96
  97 #define FD_BITMAP_SIZE 32
  98
  99 #define CTLESC '\001'
 100 #define CTLNUL '\177'
 101
 102 /* Information about the current user. */
 103 struct user_info {
 104   uid_t uid, euid;
 105   gid_t gid, egid;
 106   char *user_name;
 107   char *shell;          /* shell from the password file */
 108   char *home_dir;
 109 };
 110
 111 extern struct user_info current_user;
 112
 113 /* Force gcc to not clobber X on a longjmp().  Old versions of gcc mangle
 114    this badly. */
 115 #if __GNUC__ == 2 && __GNUC_MINOR__ > 8
 116 #  define USE_VAR(x)    ((void) &(x))
 117 #else
 118 #  define USE_VAR(x)
 119 #endif