1 /* Sample builtin to be dynamically loaded with enable -f and create a new
4 /* See Makefile for compilation details. */
7 Copyright (C) 1999-2009 Free Software Foundation, Inc.
9 This file is part of GNU Bash.
10 Bash is free software: you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation, either version 3 of the License, or
13 (at your option) any later version.
15 Bash is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with Bash. If not, see <http://www.gnu.org/licenses/>.
26 #if defined (HAVE_UNISTD_H)
34 #include "bashgetopt.h"
36 /* A builtin `xxx' is normally implemented with an `xxx_builtin' function.
37 If you're converting a command that uses the normal Unix argc/argv
38 calling convention, use argv = make_builtin_argv (list, &argc) and call
39 the original `main' something like `xxx_main'. Look at cat.c for an
42 Builtins should use internal_getopt to parse options. It is the same as
43 getopt(3), but it takes a WORD_LIST *. Look at print.c for an example
46 If the builtin takes no options, call no_options(list) before doing
47 anything else. If it returns a non-zero value, your builtin should
48 immediately return EX_USAGE. Look at logname.c for an example.
50 A builtin command returns EXECUTION_SUCCESS for success and
51 EXECUTION_FAILURE to indicate failure. */
56 printf("hello world\n");
58 return (EXECUTION_SUCCESS);
61 /* An array of strings forming the `long' documentation for a builtin xxx,
62 which is printed by `help xxx'. It must end with a NULL. By convention,
63 the first line is a short description. */
67 "this is the long doc for the sample hello builtin",
71 /* The standard structure describing a builtin command. bash keeps an array
72 of these structures. The flags must include BUILTIN_ENABLED so the
73 builtin can be used. */
74 struct builtin hello_struct = {
75 "hello", /* builtin name */
76 hello_builtin, /* function implementing the builtin */
77 BUILTIN_ENABLED, /* initial flags for builtin */
78 hello_doc, /* array of long documentation strings. */
79 "hello", /* usage synopsis; becomes short_doc */
80 0 /* reserved for internal use */