60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
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/* Sample builtin to be dynamically loaded with enable -f and create a new
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builtin. */
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/* See Makefile for compilation details. */
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#include "config.h"
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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/* A builtin `xxx' is normally implemented with an `xxx_builtin' function.
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If you're converting a command that uses the normal Unix argc/argv
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calling convention, use argv = word_list_to_argv (list, &argc) and call
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the original `main' something like `xxx_main'. Look at cat.c for an
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example.
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Builtins should use internal_getopt to parse options. It is the same as
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getopt(3), but it takes a WORD_LIST *. Look at print.c for an example
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of its use.
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If the builtin takes no options, call no_options(list) before doing
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anything else. If it returns a non-zero value, your builtin should
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immediately return EX_USAGE. Look at logname.c for an example.
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A builtin command returns EXECUTION_SUCCESS for success and
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EXECUTION_FAILURE to indicate failure. */
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hello_builtin (list)
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WORD_LIST *list;
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{
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printf("hello world\n");
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fflush (stdout);
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return (EXECUTION_SUCCESS);
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}
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/* An array of strings forming the `long' documentation for a builtin xxx,
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which is printed by `help xxx'. It must end with a NULL. */
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char *hello_doc[] = {
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"this is the long doc for the sample hello builtin",
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"which is a bare-bones echo",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. The flags must include BUILTIN_ENABLED so the
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builtin can be used. */
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struct builtin hello_struct = {
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"hello", /* builtin name */
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hello_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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hello_doc, /* array of long documentation strings. */
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"hello [args]", /* usage synopsis; becomes short_doc */
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0 /* reserved for internal use */
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};
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