Stack applications Gosub, Return, etc. More...

#include "asterisk.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/manager.h"
#include "asterisk/channel.h"
#include "asterisk/agi.h"
#include "asterisk/stasis_channels.h"

Include dependency graph for app_stack.c:

Go to the source code of this file.

Data Structures
struct	gosub_stack_frame

struct	gosub_stack_list

Functions
static void	__reg_module (void)

static void	__unreg_module (void)

struct ast_module *	AST_MODULE_SELF_SYM (void)

static void	balance_stack (struct ast_channel *chan)

static const char *	expand_gosub_args (struct ast_channel chan, const char args)

static int	frame_set_var (struct ast_channel chan, struct gosub_stack_frame frame, const char var, const char value)

static struct gosub_stack_frame *	gosub_allocate_frame (const char context, const char extension, int priority, int in_subroutine, unsigned char arguments)

static int	gosub_exec (struct ast_channel chan, const char data)

static void	gosub_free (void *data)

static void	gosub_release_frame (struct ast_channel chan, struct gosub_stack_frame frame)

static int	gosub_run (struct ast_channel chan, const char sub_args, int ignore_hangup)

static int	gosubif_exec (struct ast_channel chan, const char data)

static int	handle_gosub (struct ast_channel chan, AGI agi, int argc, const char const argv)

static int	load_module (void)

static int	local_read (struct ast_channel chan, const char cmd, char data, char buf, size_t len)

static int	local_write (struct ast_channel chan, const char cmd, char var, const char value)

static int	peek_read (struct ast_channel chan, const char cmd, char data, char buf, size_t len)

static int	pop_exec (struct ast_channel chan, const char data)

static int	return_exec (struct ast_channel chan, const char data)

static int	stackpeek_read (struct ast_channel chan, const char cmd, char data, struct ast_str *str, ssize_t len)

static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT \| AST_MODFLAG_LOAD_ORDER , .description = "Dialplan subroutines (Gosub, Return, etc)" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND, .optional_modules = "res_agi", }

static const char	app_gosub [] = "Gosub"

static const char	app_gosubif [] = "GosubIf"

static const char	app_pop [] = "StackPop"

static const char	app_return [] = "Return"

static const struct ast_module_info *	ast_module_info = &__mod_info

static struct agi_command	gosub_agi_command

static struct ast_custom_function	local_function

static struct ast_custom_function	peek_function

static const struct ast_datastore_info	stack_info

static struct ast_custom_function	stackpeek_function

Detailed Description

Stack applications Gosub, Return, etc.

Author: Tilghman Lesher app_s.nosp@m.tack.nosp@m._v003.nosp@m.@the.nosp@m.-tilg.nosp@m.hman.nosp@m..com

Definition in file app_stack.c.

Function Documentation

◆ __reg_module()

static void __reg_module ( void )

static

Definition at line 1321 of file app_stack.c.

◆ __unreg_module()

static void __unreg_module ( void )

static

Definition at line 1321 of file app_stack.c.

◆ AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM ( void )

Definition at line 1321 of file app_stack.c.

◆ balance_stack()

static void balance_stack ( struct ast_channel * chan )

static

Definition at line 926 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_list *oldlist;
    struct gosub_stack_frame *oldframe;
    int found;
 
    stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
    if (!stack_store) {
        ast_log(LOG_WARNING, "No %s stack allocated.\n", app_gosub);
        return;
    }
 
    oldlist = stack_store->data;
    AST_LIST_LOCK(oldlist);
    do {
        oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries);
        if (!oldframe) {
            break;
        }
        found = oldframe->is_special;
        gosub_release_frame(chan, oldframe);
    } while (!found);
    AST_LIST_UNLOCK(oldlist);
}

References app_gosub, ast_channel_datastore_find(), AST_LIST_LOCK, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, ast_log, ast_datastore::data, gosub_stack_frame::entries, gosub_release_frame(), gosub_stack_frame::is_special, LOG_WARNING, NULL, and stack_info.

Referenced by gosub_run(), and handle_gosub().

◆ expand_gosub_args()

static const char * expand_gosub_args	(	struct ast_channel *	chan,
		const char *	args
	)

static

Definition at line 448 of file app_stack.c.

{
    int len;
    char *parse;
    char *label;
    char *new_args;
    const char *context;
    const char *exten;
    const char *pri;
 
    /* Separate the context,exten,pri from the optional routine arguments. */
    parse = ast_strdupa(args);
    label = strsep(&parse, "(");
    if (parse) {
        char *endparen;
 
        endparen = strrchr(parse, ')');
        if (endparen) {
            *endparen = '\0';
        } else {
            ast_log(LOG_WARNING, "Ouch.  No closing paren: '%s'?\n", args);
        }
    }
 
    /* Split context,exten,pri */
    context = strsep(&label, ",");
    exten = strsep(&label, ",");
    pri = strsep(&label, ",");
    if (!exten) {
        /* Only a priority in this one */
        pri = context;
        exten = NULL;
        context = NULL;
    } else if (!pri) {
        /* Only an extension and priority in this one */
        pri = exten;
        exten = context;
        context = NULL;
    }
 
    ast_channel_lock(chan);
    if (ast_strlen_zero(exten)) {
        exten = ast_channel_exten(chan);
    }
    if (ast_strlen_zero(context)) {
        context = ast_channel_context(chan);
    }
    len = strlen(context) + strlen(exten) + strlen(pri) + 3;
    if (!ast_strlen_zero(parse)) {
        len += 2 + strlen(parse);
    }
    new_args = ast_malloc(len);
    if (new_args) {
        if (ast_strlen_zero(parse)) {
            snprintf(new_args, len, "%s,%s,%s", context, exten, pri);
        } else {
            snprintf(new_args, len, "%s,%s,%s(%s)", context, exten, pri, parse);
        }
    }
    ast_channel_unlock(chan);
 
    ast_debug(4, "Gosub args:%s new_args:%s\n", args, new_args ? new_args : "");
 
    return new_args;
}

References args, ast_channel_context(), ast_channel_exten(), ast_channel_lock, ast_channel_unlock, ast_debug, ast_log, ast_malloc, ast_strdupa, ast_strlen_zero(), voicemailpwcheck::context, len(), LOG_WARNING, NULL, and strsep().

Referenced by load_module().

◆ frame_set_var()

static int frame_set_var	(	struct ast_channel *	chan,
		struct gosub_stack_frame *	frame,
		const char *	var,
		const char *	value
	)

static

Definition at line 258 of file app_stack.c.

{
    struct ast_var_t *variables;
    int found = 0;
    int len;
    RAII_VAR(char *, local_buffer, NULL, ast_free);
 
    /* Does this variable already exist? */
    AST_LIST_TRAVERSE(&frame->varshead, variables, entries) {
        if (!strcmp(var, ast_var_name(variables))) {
            found = 1;
            break;
        }
    }
 
    if (!found) {
        if ((variables = ast_var_assign(var, ""))) {
            AST_LIST_INSERT_HEAD(&frame->varshead, variables, entries);
        }
        pbx_builtin_pushvar_helper(chan, var, value);
    } else {
        pbx_builtin_setvar_helper(chan, var, value);
    }
 
    len = 8 + strlen(var); /* LOCAL() + var */
    local_buffer = ast_malloc(len);
    if (!local_buffer) {
        return 0;
    }
    sprintf(local_buffer, "LOCAL(%s)", var);
    ast_channel_publish_varset(chan, local_buffer, value);
    return 0;
}

References ast_channel_publish_varset(), ast_free, AST_LIST_INSERT_HEAD, AST_LIST_TRAVERSE, ast_malloc, ast_var_assign, ast_var_name(), ast_var_t::entries, len(), NULL, pbx_builtin_pushvar_helper(), pbx_builtin_setvar_helper(), RAII_VAR, value, var, and gosub_stack_frame::varshead.

Referenced by gosub_exec(), and local_write().

◆ gosub_allocate_frame()

static struct gosub_stack_frame * gosub_allocate_frame	(	const char *	context,
		const char *	extension,
		int	priority,
		int	in_subroutine,
		unsigned char	arguments
	)

static

Definition at line 311 of file app_stack.c.

{
    struct gosub_stack_frame *new = NULL;
    int len_extension = strlen(extension) + 1;
    int len_context = strlen(context) + 1;
 
    if ((new = ast_calloc(1, sizeof(*new) + len_extension + len_context))) {
        AST_LIST_HEAD_INIT_NOLOCK(&new->varshead);
        ast_copy_string(new->extension, extension, len_extension);
        new->context = new->extension + len_extension;
        ast_copy_string(new->context, context, len_context);
        new->priority = priority;
        new->in_subroutine = in_subroutine ? 1 : 0;
        new->arguments = arguments;
    }
    return new;
}

References gosub_stack_frame::arguments, ast_calloc, ast_copy_string(), AST_LIST_HEAD_INIT_NOLOCK, voicemailpwcheck::context, gosub_stack_frame::in_subroutine, NULL, and priority.

Referenced by gosub_exec().

◆ gosub_exec()

static int gosub_exec	(	struct ast_channel *	chan,
		const char *	data
	)

static

Definition at line 514 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_list *oldlist;
    struct gosub_stack_frame *newframe;
    struct gosub_stack_frame *lastframe;
    char argname[15];
    char *parse;
    char *label;
    char *caller_id;
    char *orig_context;
    char *orig_exten;
    char *dest_context;
    char *dest_exten;
    int orig_in_subroutine;
    int orig_priority;
    int dest_priority;
    int i;
    int max_argc = 0;
    AST_DECLARE_APP_ARGS(args2,
        AST_APP_ARG(argval)[100];
    );
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_ERROR, "%s requires an argument: %s([[context,]exten,]priority[(arg1[,...][,argN])])\n", app_gosub, app_gosub);
        return -1;
    }
 
    /*
     * Separate the arguments from the label
     *
     * NOTE:  You cannot use ast_app_separate_args for this, because
     * '(' cannot be used as a delimiter.
     */
    parse = ast_strdupa(data);
    label = strsep(&parse, "(");
    if (parse) {
        char *endparen;
 
        endparen = strrchr(parse, ')');
        if (endparen) {
            *endparen = '\0';
        } else {
            ast_log(LOG_WARNING, "Ouch.  No closing paren: '%s'?\n", data);
        }
        AST_STANDARD_RAW_ARGS(args2, parse);
    } else {
        args2.argc = 0;
    }
 
    ast_channel_lock(chan);
    orig_context = ast_strdupa(ast_channel_context(chan));
    orig_exten = ast_strdupa(ast_channel_exten(chan));
    orig_priority = ast_channel_priority(chan);
    orig_in_subroutine = ast_test_flag(ast_channel_flags(chan), AST_FLAG_SUBROUTINE_EXEC);
    ast_channel_unlock(chan);
 
    if (ast_parseable_goto(chan, label)) {
        ast_log(LOG_ERROR, "%s address is invalid: '%s'\n", app_gosub, data);
        goto error_exit;
    }
 
    ast_channel_lock(chan);
    dest_context = ast_strdupa(ast_channel_context(chan));
    dest_exten = ast_strdupa(ast_channel_exten(chan));
    dest_priority = ast_channel_priority(chan);
    if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP)) {
        ++dest_priority;
    }
    caller_id = S_COR(ast_channel_caller(chan)->id.number.valid,
        ast_channel_caller(chan)->id.number.str, NULL);
    if (caller_id) {
        caller_id = ast_strdupa(caller_id);
    }
    ast_channel_unlock(chan);
 
    if (!ast_exists_extension(chan, dest_context, dest_exten, dest_priority, caller_id)) {
        ast_log(LOG_ERROR, "%s attempted to reach non-existent destination '%s,%s,%d' from '%s,%s,%d'",
            app_gosub, dest_context, dest_exten, dest_priority, orig_context, orig_exten, orig_priority);
        goto error_exit;
    }
 
    /* Now we know that we're going to a new location */
 
    ast_channel_lock(chan);
 
    /* Find stack datastore return list. */
    if (!(stack_store = ast_channel_datastore_find(chan, &stack_info, NULL))) {
        ast_debug(1, "Channel %s has no datastore, so we're allocating one.\n",
            ast_channel_name(chan));
        stack_store = ast_datastore_alloc(&stack_info, NULL);
        if (!stack_store) {
            ast_log(LOG_ERROR, "Unable to allocate new datastore.  %s failed.\n",
                app_gosub);
            goto error_exit_locked;
        }
 
        oldlist = ast_calloc(1, sizeof(*oldlist));
        if (!oldlist) {
            ast_log(LOG_ERROR, "Unable to allocate datastore list head.  %s failed.\n",
                app_gosub);
            ast_datastore_free(stack_store);
            goto error_exit_locked;
        }
        AST_LIST_HEAD_INIT(oldlist);
 
        stack_store->data = oldlist;
        ast_channel_datastore_add(chan, stack_store);
    } else {
        oldlist = stack_store->data;
    }
 
    if ((lastframe = AST_LIST_FIRST(oldlist))) {
        max_argc = lastframe->arguments;
    }
 
    /* Mask out previous Gosub arguments in this invocation */
    if (args2.argc > max_argc) {
        max_argc = args2.argc;
    }
 
    /* Create the return address */
    newframe = gosub_allocate_frame(orig_context, orig_exten, orig_priority + 1, orig_in_subroutine, max_argc);
    if (!newframe) {
        goto error_exit_locked;
    }
 
    /* Set our arguments */
    for (i = 0; i < max_argc; i++) {
        snprintf(argname, sizeof(argname), "ARG%d", i + 1);
        frame_set_var(chan, newframe, argname, i < args2.argc ? args2.argval[i] : "");
        ast_debug(1, "Setting '%s' to '%s'\n", argname, i < args2.argc ? args2.argval[i] : "");
    }
    snprintf(argname, sizeof(argname), "%u", args2.argc);
    frame_set_var(chan, newframe, "ARGC", argname);
 
    ast_set_flag(ast_channel_flags(chan), AST_FLAG_SUBROUTINE_EXEC);
 
    /* And finally, save our return address */
    AST_LIST_LOCK(oldlist);
    AST_LIST_INSERT_HEAD(oldlist, newframe, entries);
    AST_LIST_UNLOCK(oldlist);
    ast_channel_unlock(chan);
 
    return 0;
 
error_exit:
    ast_channel_lock(chan);
 
error_exit_locked:
    /* Restore the original dialplan location. */
    ast_channel_context_set(chan, orig_context);
    ast_channel_exten_set(chan, orig_exten);
    ast_channel_priority_set(chan, orig_priority);
    ast_channel_unlock(chan);
    return -1;
}

References app_gosub, gosub_stack_frame::arguments, AST_APP_ARG, ast_calloc, ast_channel_caller(), ast_channel_context(), ast_channel_context_set(), ast_channel_datastore_add(), ast_channel_datastore_find(), ast_channel_exten(), ast_channel_exten_set(), ast_channel_flags(), ast_channel_lock, ast_channel_name(), ast_channel_priority(), ast_channel_priority_set(), ast_channel_unlock, ast_datastore_alloc, ast_datastore_free(), ast_debug, AST_DECLARE_APP_ARGS, ast_exists_extension(), AST_FLAG_IN_AUTOLOOP, AST_FLAG_SUBROUTINE_EXEC, AST_LIST_FIRST, AST_LIST_HEAD_INIT, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_UNLOCK, ast_log, ast_parseable_goto(), ast_set_flag, AST_STANDARD_RAW_ARGS, ast_strdupa, ast_strlen_zero(), ast_test_flag, ast_datastore::data, gosub_stack_frame::entries, frame_set_var(), gosub_allocate_frame(), LOG_ERROR, LOG_WARNING, NULL, orig_exten(), S_COR, stack_info, and strsep().

Referenced by gosub_run(), gosubif_exec(), handle_gosub(), and load_module().

◆ gosub_free()

static void gosub_free ( void * data )

static

Definition at line 329 of file app_stack.c.

{
    struct gosub_stack_list *oldlist = data;
    struct gosub_stack_frame *oldframe;
 
    AST_LIST_LOCK(oldlist);
    while ((oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries))) {
        gosub_release_frame(NULL, oldframe);
    }
    AST_LIST_UNLOCK(oldlist);
    AST_LIST_HEAD_DESTROY(oldlist);
    ast_free(oldlist);
}

References ast_free, AST_LIST_HEAD_DESTROY, AST_LIST_LOCK, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, gosub_stack_frame::entries, gosub_release_frame(), and NULL.

◆ gosub_release_frame()

static void gosub_release_frame	(	struct ast_channel *	chan,
		struct gosub_stack_frame *	frame
	)

static

Definition at line 292 of file app_stack.c.

{
    struct ast_var_t *vardata;
 
    /* If chan is not defined, then we're calling it as part of gosub_free,
     * and the channel variables will be deallocated anyway.  Otherwise, we're
     * just releasing a single frame, so we need to clean up the arguments for
     * that frame, so that we re-expose the variables from the previous frame
     * that were hidden by this one.
     */
    while ((vardata = AST_LIST_REMOVE_HEAD(&frame->varshead, entries))) {
        if (chan)
            pbx_builtin_setvar_helper(chan, ast_var_name(vardata), NULL);
        ast_var_delete(vardata);
    }
 
    ast_free(frame);
}

References ast_free, AST_LIST_REMOVE_HEAD, ast_var_delete(), ast_var_name(), ast_var_t::entries, NULL, pbx_builtin_setvar_helper(), and gosub_stack_frame::varshead.

Referenced by balance_stack(), gosub_free(), pop_exec(), and return_exec().

◆ gosub_run()

static int gosub_run	(	struct ast_channel *	chan,
		const char *	sub_args,
		int	ignore_hangup
	)

static

Definition at line 966 of file app_stack.c.

{
    const char *saved_context;
    const char *saved_exten;
    int saved_priority;
    int saved_hangup_flags;
    int saved_autoloopflag;
    int saved_in_subroutine;
    int res;
 
    ast_channel_lock(chan);
 
    ast_verb(3, "%s Internal %s(%s) start\n",
        ast_channel_name(chan), app_gosub, sub_args);
 
    /* Save non-hangup softhangup flags. */
    saved_hangup_flags = ast_channel_softhangup_internal_flag(chan)
        & AST_SOFTHANGUP_ASYNCGOTO;
    if (saved_hangup_flags) {
        ast_channel_clear_softhangup(chan, AST_SOFTHANGUP_ASYNCGOTO);
    }
 
    /* Save autoloop flag */
    saved_autoloopflag = ast_test_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP);
    ast_set_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP);
 
    /* Save current dialplan location */
    saved_context = ast_strdupa(ast_channel_context(chan));
    saved_exten = ast_strdupa(ast_channel_exten(chan));
    saved_priority = ast_channel_priority(chan);
 
    /* Save whether or not we are in a subroutine */
    saved_in_subroutine = ast_test_flag(ast_channel_flags(chan), AST_FLAG_SUBROUTINE_EXEC);
 
    ast_debug(4, "%s Original location: %s,%s,%d\n", ast_channel_name(chan),
        saved_context, saved_exten, saved_priority);
 
    ast_channel_unlock(chan);
    res = gosub_exec(chan, sub_args);
    ast_debug(4, "%s exited with status %d\n", app_gosub, res);
    ast_channel_lock(chan);
    if (!res) {
        struct ast_datastore *stack_store;
 
        /* Mark the return location as special. */
        stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
        if (!stack_store) {
            /* Should never happen! */
            ast_log(LOG_ERROR, "No %s stack!\n", app_gosub);
            res = -1;
        } else {
            struct gosub_stack_list *oldlist;
            struct gosub_stack_frame *cur;
 
            oldlist = stack_store->data;
            cur = AST_LIST_FIRST(oldlist);
            cur->is_special = 1;
        }
    }
    if (!res) {
        int found = 0;  /* set if we find at least one match */
 
        /*
         * Run gosub body autoloop.
         *
         * Note that this loop is inverted from the normal execution
         * loop because we just executed the Gosub application as the
         * first extension of the autoloop.
         */
        do {
            /* Check for hangup. */
            if (ast_check_hangup(chan)) {
                if (ast_channel_softhangup_internal_flag(chan) & AST_SOFTHANGUP_ASYNCGOTO) {
                    ast_log(LOG_ERROR, "%s An async goto just messed up our execution location.\n",
                        ast_channel_name(chan));
                    break;
                }
                if (!ignore_hangup) {
                    break;
                }
            }
 
            /* Next dialplan priority. */
            ast_channel_priority_set(chan, ast_channel_priority(chan) + 1);
 
            ast_channel_unlock(chan);
            res = ast_spawn_extension(chan, ast_channel_context(chan),
                ast_channel_exten(chan), ast_channel_priority(chan),
                S_COR(ast_channel_caller(chan)->id.number.valid,
                    ast_channel_caller(chan)->id.number.str, NULL),
                &found, 1);
            ast_channel_lock(chan);
        } while (!res);
        if (found && res) {
            /* Something bad happened, or a hangup has been requested. */
            ast_debug(1, "Spawn extension (%s,%s,%d) exited with %d on '%s'\n",
                ast_channel_context(chan), ast_channel_exten(chan),
                ast_channel_priority(chan), res, ast_channel_name(chan));
            ast_verb(2, "Spawn extension (%s, %s, %d) exited non-zero on '%s'\n",
                ast_channel_context(chan), ast_channel_exten(chan),
                ast_channel_priority(chan), ast_channel_name(chan));
        }
 
        /* Did the routine return? */
        if (ast_channel_priority(chan) == saved_priority
            && !strcmp(ast_channel_context(chan), saved_context)
            && !strcmp(ast_channel_exten(chan), saved_exten)) {
            ast_verb(3, "%s Internal %s(%s) complete GOSUB_RETVAL=%s\n",
                ast_channel_name(chan), app_gosub, sub_args,
                S_OR(pbx_builtin_getvar_helper(chan, "GOSUB_RETVAL"), ""));
        } else {
            ast_log(LOG_WARNING, "%s Abnormal '%s(%s)' exit.  Popping routine return locations.\n",
                ast_channel_name(chan), app_gosub, sub_args);
            balance_stack(chan);
            pbx_builtin_setvar_helper(chan, "GOSUB_RETVAL", "");
        }
 
        /* We executed the requested subroutine to the best of our ability. */
        res = 0;
    }
 
    ast_debug(4, "%s Ending location: %s,%s,%d\n", ast_channel_name(chan),
        ast_channel_context(chan), ast_channel_exten(chan),
        ast_channel_priority(chan));
 
    /* Restore dialplan location */
    if (!(ast_channel_softhangup_internal_flag(chan) & AST_SOFTHANGUP_ASYNCGOTO)) {
        ast_channel_context_set(chan, saved_context);
        ast_channel_exten_set(chan, saved_exten);
        ast_channel_priority_set(chan, saved_priority);
    }
 
    /* Restore autoloop flag */
    ast_set2_flag(ast_channel_flags(chan), saved_autoloopflag, AST_FLAG_IN_AUTOLOOP);
 
    /* Restore subroutine flag */
    ast_set2_flag(ast_channel_flags(chan), saved_in_subroutine, AST_FLAG_SUBROUTINE_EXEC);
 
    /* Restore non-hangup softhangup flags. */
    if (saved_hangup_flags) {
        ast_softhangup_nolock(chan, saved_hangup_flags);
    }
 
    ast_channel_unlock(chan);
 
    return res;
}

References app_gosub, ast_channel_caller(), ast_channel_clear_softhangup(), ast_channel_context(), ast_channel_context_set(), ast_channel_datastore_find(), ast_channel_exten(), ast_channel_exten_set(), ast_channel_flags(), ast_channel_lock, ast_channel_name(), ast_channel_priority(), ast_channel_priority_set(), ast_channel_softhangup_internal_flag(), ast_channel_unlock, ast_check_hangup(), ast_debug, AST_FLAG_IN_AUTOLOOP, AST_FLAG_SUBROUTINE_EXEC, AST_LIST_FIRST, ast_log, ast_set2_flag, ast_set_flag, AST_SOFTHANGUP_ASYNCGOTO, ast_softhangup_nolock(), ast_spawn_extension(), ast_strdupa, ast_test_flag, ast_verb, balance_stack(), ast_datastore::data, gosub_exec(), ignore_hangup, gosub_stack_frame::is_special, LOG_ERROR, LOG_WARNING, NULL, pbx_builtin_getvar_helper(), pbx_builtin_setvar_helper(), S_COR, S_OR, and stack_info.

Referenced by load_module().

◆ gosubif_exec()

static int gosubif_exec	(	struct ast_channel *	chan,
		const char *	data
	)

static

Definition at line 672 of file app_stack.c.

{
    char *args;
    int res=0;
    AST_DECLARE_APP_ARGS(cond,
        AST_APP_ARG(ition);
        AST_APP_ARG(labels);
    );
    AST_DECLARE_APP_ARGS(label,
        AST_APP_ARG(iftrue);
        AST_APP_ARG(iffalse);
    );
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_WARNING, "GosubIf requires an argument: GosubIf(cond?label1(args):label2(args)\n");
        return 0;
    }
 
    args = ast_strdupa(data);
    AST_NONSTANDARD_RAW_ARGS(cond, args, '?');
    if (cond.argc != 2) {
        ast_log(LOG_WARNING, "GosubIf requires an argument: GosubIf(cond?label1(args):label2(args)\n");
        return 0;
    }
 
    AST_NONSTANDARD_RAW_ARGS(label, cond.labels, ':');
 
    if (pbx_checkcondition(cond.ition)) {
        if (!ast_strlen_zero(label.iftrue))
            res = gosub_exec(chan, label.iftrue);
    } else if (!ast_strlen_zero(label.iffalse)) {
        res = gosub_exec(chan, label.iffalse);
    }
 
    return res;
}

References args, AST_APP_ARG, AST_DECLARE_APP_ARGS, ast_log, AST_NONSTANDARD_RAW_ARGS, ast_strdupa, ast_strlen_zero(), cond, gosub_exec(), LOG_WARNING, and pbx_checkcondition().

Referenced by load_module().

◆ handle_gosub()

static int handle_gosub	(	struct ast_channel *	chan,
		AGI *	agi,
		int	argc,
		const char const	argv
	)

static

Definition at line 1114 of file app_stack.c.

{
    int res;
    int priority;
    int old_autoloopflag;
    int old_in_subroutine;
    int old_priority;
    const char *old_context;
    const char *old_extension;
    char *gosub_args;
 
    if (argc < 4 || argc > 5) {
        return RESULT_SHOWUSAGE;
    }
 
    ast_debug(1, "Gosub called with %d arguments: 0:%s 1:%s 2:%s 3:%s 4:%s\n", argc, argv[0], argv[1], argv[2], argv[3], argc == 5 ? argv[4] : "");
 
    if (sscanf(argv[3], "%30d", &priority) != 1 || priority < 1) {
        /* Lookup the priority label */
        priority = ast_findlabel_extension(chan, argv[1], argv[2], argv[3],
            S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL));
        if (priority < 0) {
            ast_log(LOG_ERROR, "Priority '%s' not found in '%s@%s'\n", argv[3], argv[2], argv[1]);
            ast_agi_send(agi->fd, chan, "200 result=-1 Gosub label not found\n");
            return RESULT_FAILURE;
        }
    } else if (!ast_exists_extension(chan, argv[1], argv[2], priority,
        S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))) {
        ast_agi_send(agi->fd, chan, "200 result=-1 Gosub label not found\n");
        return RESULT_FAILURE;
    }
 
    if (argc == 5) {
        if (ast_asprintf(&gosub_args, "%s,%s,%d(%s)", argv[1], argv[2], priority, argv[4]) < 0) {
            gosub_args = NULL;
        }
    } else {
        if (ast_asprintf(&gosub_args, "%s,%s,%d", argv[1], argv[2], priority) < 0) {
            gosub_args = NULL;
        }
    }
    if (!gosub_args) {
        ast_agi_send(agi->fd, chan, "503 result=-2 Memory allocation failure\n");
        return RESULT_FAILURE;
    }
 
    ast_channel_lock(chan);
 
    ast_verb(3, "%s AGI %s(%s) start\n", ast_channel_name(chan), app_gosub, gosub_args);
 
    /* Save autoloop flag */
    old_autoloopflag = ast_test_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP);
    ast_set_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP);
 
    /* Save subroutine flag */
    old_in_subroutine = ast_test_flag(ast_channel_flags(chan), AST_FLAG_SUBROUTINE_EXEC);
 
    /* Save previous location, since we're going to change it */
    old_context = ast_strdupa(ast_channel_context(chan));
    old_extension = ast_strdupa(ast_channel_exten(chan));
    old_priority = ast_channel_priority(chan);
 
    ast_debug(4, "%s Original location: %s,%s,%d\n", ast_channel_name(chan),
        old_context, old_extension, old_priority);
    ast_channel_unlock(chan);
 
    res = gosub_exec(chan, gosub_args);
    if (!res) {
        struct ast_datastore *stack_store;
 
        /* Mark the return location as special. */
        ast_channel_lock(chan);
        stack_store = ast_channel_datastore_find(chan, &stack_info, NULL);
        if (!stack_store) {
            /* Should never happen! */
            ast_log(LOG_ERROR, "No %s stack!\n", app_gosub);
            res = -1;
        } else {
            struct gosub_stack_list *oldlist;
            struct gosub_stack_frame *cur;
 
            oldlist = stack_store->data;
            cur = AST_LIST_FIRST(oldlist);
            cur->is_special = 1;
        }
        ast_channel_unlock(chan);
    }
    if (!res) {
        struct ast_pbx *pbx;
        struct ast_pbx_args args;
        int abnormal_exit;
 
        memset(&args, 0, sizeof(args));
        args.no_hangup_chan = 1;
 
        ast_channel_lock(chan);
 
        /* Next dialplan priority. */
        ast_channel_priority_set(chan, ast_channel_priority(chan) + 1);
 
        /* Suppress warning about PBX already existing */
        pbx = ast_channel_pbx(chan);
        ast_channel_pbx_set(chan, NULL);
        ast_channel_unlock(chan);
 
        ast_agi_send(agi->fd, chan, "100 result=0 Trying...\n");
        ast_pbx_run_args(chan, &args);
 
        ast_channel_lock(chan);
        ast_free(ast_channel_pbx(chan));
        ast_channel_pbx_set(chan, pbx);
 
        /* Did the routine return? */
        if (ast_channel_priority(chan) == old_priority
            && !strcmp(ast_channel_context(chan), old_context)
            && !strcmp(ast_channel_exten(chan), old_extension)) {
            ast_verb(3, "%s AGI %s(%s) complete GOSUB_RETVAL=%s\n",
                ast_channel_name(chan), app_gosub, gosub_args,
                S_OR(pbx_builtin_getvar_helper(chan, "GOSUB_RETVAL"), ""));
            abnormal_exit = 0;
        } else {
            ast_log(LOG_NOTICE, "%s Abnormal AGI %s(%s) exit.  Popping routine return locations.\n",
                ast_channel_name(chan), app_gosub, gosub_args);
            balance_stack(chan);
            pbx_builtin_setvar_helper(chan, "GOSUB_RETVAL", "");
            abnormal_exit = 1;
        }
        ast_channel_unlock(chan);
 
        ast_agi_send(agi->fd, chan, "200 result=0 Gosub complete%s\n",
            abnormal_exit ? " (abnormal exit)" : "");
    } else {
        ast_agi_send(agi->fd, chan, "200 result=%d Gosub failed\n", res);
    }
 
    ast_free(gosub_args);
 
    ast_channel_lock(chan);
    ast_debug(4, "%s Ending location: %s,%s,%d\n", ast_channel_name(chan),
        ast_channel_context(chan), ast_channel_exten(chan),
        ast_channel_priority(chan));
 
    /* Restore previous location */
    ast_channel_context_set(chan, old_context);
    ast_channel_exten_set(chan, old_extension);
    ast_channel_priority_set(chan, old_priority);
 
    /* Restore autoloop flag */
    ast_set2_flag(ast_channel_flags(chan), old_autoloopflag, AST_FLAG_IN_AUTOLOOP);
 
    /* Restore subroutine flag */
    ast_set2_flag(ast_channel_flags(chan), old_in_subroutine, AST_FLAG_SUBROUTINE_EXEC);
    ast_channel_unlock(chan);
 
    return RESULT_SUCCESS;
}

References app_gosub, args, ast_agi_send(), ast_asprintf, ast_channel_caller(), ast_channel_context(), ast_channel_context_set(), ast_channel_datastore_find(), ast_channel_exten(), ast_channel_exten_set(), ast_channel_flags(), ast_channel_lock, ast_channel_name(), ast_channel_pbx(), ast_channel_pbx_set(), ast_channel_priority(), ast_channel_priority_set(), ast_channel_unlock, ast_debug, ast_exists_extension(), ast_findlabel_extension(), AST_FLAG_IN_AUTOLOOP, AST_FLAG_SUBROUTINE_EXEC, ast_free, AST_LIST_FIRST, ast_log, ast_pbx_run_args(), ast_set2_flag, ast_set_flag, ast_strdupa, ast_test_flag, ast_verb, balance_stack(), ast_datastore::data, agi_state::fd, gosub_exec(), gosub_stack_frame::is_special, LOG_ERROR, LOG_NOTICE, NULL, pbx_builtin_getvar_helper(), pbx_builtin_setvar_helper(), priority, RESULT_FAILURE, RESULT_SHOWUSAGE, RESULT_SUCCESS, S_COR, S_OR, and stack_info.

◆ load_module()

static int load_module ( void )

static

Definition at line 1291 of file app_stack.c.

{
    /* Setup the stack application callback functions. */
    static struct ast_app_stack_funcs funcs = {
        .run_sub = gosub_run,
        .expand_sub_args = expand_gosub_args,
    };
 
    ast_agi_register(ast_module_info->self, &gosub_agi_command);
 
    ast_register_application_xml(app_pop, pop_exec);
    ast_register_application_xml(app_return, return_exec);
    ast_register_application_xml(app_gosubif, gosubif_exec);
    ast_register_application_xml(app_gosub, gosub_exec);
    ast_custom_function_register(&local_function);
    ast_custom_function_register(&peek_function);
    ast_custom_function_register(&stackpeek_function);
 
    funcs.module = ast_module_info->self,
    ast_install_stack_functions(&funcs);
 
    return 0;
}

References app_gosub, app_gosubif, app_pop, app_return, ast_agi_register(), ast_custom_function_register, ast_install_stack_functions(), ast_register_application_xml, expand_gosub_args(), gosub_agi_command, gosub_exec(), gosub_run(), gosubif_exec(), local_function, ast_app_stack_funcs::module, peek_function, pop_exec(), return_exec(), ast_app_stack_funcs::run_sub, ast_module_info::self, and stackpeek_function.

◆ local_read()

static int local_read	(	struct ast_channel *	chan,
		const char *	cmd,
		char *	data,
		char *	buf,
		size_t	len
	)

static

Definition at line 709 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_list *oldlist;
    struct gosub_stack_frame *frame;
    struct ast_var_t *variables;
 
    if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    ast_channel_lock(chan);
    if (!(stack_store = ast_channel_datastore_find(chan, &stack_info, NULL))) {
        ast_channel_unlock(chan);
        return -1;
    }
 
    oldlist = stack_store->data;
    AST_LIST_LOCK(oldlist);
    if (!(frame = AST_LIST_FIRST(oldlist))) {
        /* Not within a Gosub routine */
        AST_LIST_UNLOCK(oldlist);
        ast_channel_unlock(chan);
        return -1;
    }
 
    AST_LIST_TRAVERSE(&frame->varshead, variables, entries) {
        if (!strcmp(data, ast_var_name(variables))) {
            const char *tmp;
            tmp = pbx_builtin_getvar_helper(chan, data);
            ast_copy_string(buf, S_OR(tmp, ""), len);
            break;
        }
    }
    AST_LIST_UNLOCK(oldlist);
    ast_channel_unlock(chan);
    return 0;
}

References ast_channel_datastore_find(), ast_channel_lock, ast_channel_unlock, ast_copy_string(), AST_LIST_FIRST, AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log, ast_var_name(), buf, ast_datastore::data, ast_var_t::entries, len(), LOG_WARNING, NULL, pbx_builtin_getvar_helper(), S_OR, stack_info, tmp(), and gosub_stack_frame::varshead.

◆ local_write()

static int local_write	(	struct ast_channel *	chan,
		const char *	cmd,
		char *	var,
		const char *	value
	)

static

Definition at line 749 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_list *oldlist;
    struct gosub_stack_frame *frame;
 
    if (!chan) {
        ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
        return -1;
    }
 
    ast_channel_lock(chan);
    if (!(stack_store = ast_channel_datastore_find(chan, &stack_info, NULL))) {
        ast_log(LOG_ERROR, "Tried to set LOCAL(%s), but we aren't within a Gosub routine\n", var);
        ast_channel_unlock(chan);
        return -1;
    }
 
    oldlist = stack_store->data;
    AST_LIST_LOCK(oldlist);
    frame = AST_LIST_FIRST(oldlist);
 
    if (frame) {
        frame_set_var(chan, frame, var, value);
    }
 
    AST_LIST_UNLOCK(oldlist);
    ast_channel_unlock(chan);
 
    return 0;
}

References ast_channel_datastore_find(), ast_channel_lock, ast_channel_unlock, AST_LIST_FIRST, AST_LIST_LOCK, AST_LIST_UNLOCK, ast_log, ast_datastore::data, frame_set_var(), LOG_ERROR, LOG_WARNING, NULL, stack_info, value, and var.

◆ peek_read()

static int peek_read	(	struct ast_channel *	chan,
		const char *	cmd,
		char *	data,
		char *	buf,
		size_t	len
	)

static

Definition at line 787 of file app_stack.c.

{
    int found = 0, n;
    struct ast_var_t *variables;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(n);
        AST_APP_ARG(name);
    );
 
    if (!chan) {
        ast_log(LOG_ERROR, "LOCAL_PEEK must be called on an active channel\n");
        return -1;
    }
 
    AST_STANDARD_RAW_ARGS(args, data);
 
    if (ast_strlen_zero(args.n) || ast_strlen_zero(args.name)) {
        ast_log(LOG_ERROR, "LOCAL_PEEK requires parameters n and varname\n");
        return -1;
    }
 
    n = atoi(args.n);
    *buf = '\0';
 
    ast_channel_lock(chan);
    AST_LIST_TRAVERSE(ast_channel_varshead(chan), variables, entries) {
        if (!strcmp(args.name, ast_var_name(variables)) && ++found > n) {
            ast_copy_string(buf, ast_var_value(variables), len);
            break;
        }
    }
    ast_channel_unlock(chan);
    return 0;
}

References args, AST_APP_ARG, ast_channel_lock, ast_channel_unlock, ast_channel_varshead(), ast_copy_string(), AST_DECLARE_APP_ARGS, AST_LIST_TRAVERSE, ast_log, AST_STANDARD_RAW_ARGS, ast_strlen_zero(), ast_var_name(), ast_var_value(), buf, ast_var_t::entries, len(), LOG_ERROR, and name.

◆ pop_exec()

static int pop_exec	(	struct ast_channel *	chan,
		const char *	data
	)

static

Definition at line 343 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_frame *oldframe;
    struct gosub_stack_list *oldlist;
    int res = 0;
 
    ast_channel_lock(chan);
    if (!(stack_store = ast_channel_datastore_find(chan, &stack_info, NULL))) {
        ast_log(LOG_WARNING, "%s called with no gosub stack allocated.\n", app_pop);
        ast_channel_unlock(chan);
        return 0;
    }
 
    oldlist = stack_store->data;
    AST_LIST_LOCK(oldlist);
    oldframe = AST_LIST_FIRST(oldlist);
    if (oldframe) {
        if (oldframe->is_special) {
            ast_debug(1, "%s attempted to pop special return location.\n", app_pop);
 
            /* Abort the special routine dialplan execution.  Dialplan programming error. */
            res = -1;
        } else {
            AST_LIST_REMOVE_HEAD(oldlist, entries);
            gosub_release_frame(chan, oldframe);
        }
    } else {
        ast_debug(1, "%s called with an empty gosub stack\n", app_pop);
    }
    AST_LIST_UNLOCK(oldlist);
    ast_channel_unlock(chan);
    return res;
}

References app_pop, ast_channel_datastore_find(), ast_channel_lock, ast_channel_unlock, ast_debug, AST_LIST_FIRST, AST_LIST_LOCK, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, ast_log, ast_datastore::data, gosub_release_frame(), gosub_stack_frame::is_special, LOG_WARNING, NULL, and stack_info.

Referenced by load_module().

◆ return_exec()

static int return_exec	(	struct ast_channel *	chan,
		const char *	data
	)

static

Definition at line 378 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_frame *oldframe;
    struct gosub_stack_list *oldlist;
    const char *retval = data;
    int res = 0;
 
    ast_channel_lock(chan);
    if (!(stack_store = ast_channel_datastore_find(chan, &stack_info, NULL))) {
        ast_log(LOG_ERROR, "Return without Gosub: stack is unallocated\n");
        ast_channel_unlock(chan);
        return -1;
    }
 
    oldlist = stack_store->data;
    AST_LIST_LOCK(oldlist);
    oldframe = AST_LIST_REMOVE_HEAD(oldlist, entries);
    AST_LIST_UNLOCK(oldlist);
 
    if (!oldframe) {
        ast_log(LOG_ERROR, "Return without Gosub: stack is empty\n");
        ast_channel_unlock(chan);
        return -1;
    }
    if (oldframe->is_special) {
        /* Exit from special routine. */
        res = -1;
    }
 
    /*
     * We cannot use ast_explicit_goto() because we MUST restore
     * what was there before.  Channels that do not have a PBX may
     * not have the context or exten set.
     */
    ast_channel_context_set(chan, oldframe->context);
    ast_channel_exten_set(chan, oldframe->extension);
    if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_IN_AUTOLOOP)) {
        --oldframe->priority;
    }
    ast_channel_priority_set(chan, oldframe->priority);
    ast_set2_flag(ast_channel_flags(chan), oldframe->in_subroutine, AST_FLAG_SUBROUTINE_EXEC);
 
    gosub_release_frame(chan, oldframe);
 
    /* Set a return value, if any */
    pbx_builtin_setvar_helper(chan, "GOSUB_RETVAL", S_OR(retval, ""));
    ast_channel_unlock(chan);
    return res;
}

References ast_channel_context_set(), ast_channel_datastore_find(), ast_channel_exten_set(), ast_channel_flags(), ast_channel_lock, ast_channel_priority_set(), ast_channel_unlock, AST_FLAG_IN_AUTOLOOP, AST_FLAG_SUBROUTINE_EXEC, AST_LIST_LOCK, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, ast_log, ast_set2_flag, ast_test_flag, gosub_stack_frame::context, ast_datastore::data, gosub_stack_frame::extension, gosub_release_frame(), gosub_stack_frame::in_subroutine, gosub_stack_frame::is_special, LOG_ERROR, NULL, pbx_builtin_setvar_helper(), gosub_stack_frame::priority, retval, S_OR, and stack_info.

Referenced by load_module().

◆ stackpeek_read()

static int stackpeek_read	(	struct ast_channel *	chan,
		const char *	cmd,
		char *	data,
		struct ast_str **	str,
		ssize_t	len
	)

static

Definition at line 827 of file app_stack.c.

{
    struct ast_datastore *stack_store;
    struct gosub_stack_list *oldlist;
    struct gosub_stack_frame *frame;
    int n;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(n);
        AST_APP_ARG(which);
        AST_APP_ARG(suppress);
    );
 
    if (!chan) {
        ast_log(LOG_ERROR, "STACK_PEEK must be called on an active channel\n");
        return -1;
    }
 
    data = ast_strdupa(data);
    AST_STANDARD_APP_ARGS(args, data);
 
    if (ast_strlen_zero(args.n) || ast_strlen_zero(args.which)) {
        ast_log(LOG_ERROR, "STACK_PEEK requires parameters n and which\n");
        return -1;
    }
 
    n = atoi(args.n);
    if (n <= 0) {
        ast_log(LOG_ERROR, "STACK_PEEK must be called with a positive peek value\n");
        return -1;
    }
 
    ast_channel_lock(chan);
    if (!(stack_store = ast_channel_datastore_find(chan, &stack_info, NULL))) {
        if (!ast_true(args.suppress)) {
            ast_log(LOG_ERROR, "STACK_PEEK called on a channel without a gosub stack\n");
        }
        ast_channel_unlock(chan);
        return -1;
    }
 
    oldlist = stack_store->data;
 
    AST_LIST_LOCK(oldlist);
    AST_LIST_TRAVERSE(oldlist, frame, entries) {
        if (--n == 0) {
            break;
        }
    }
 
    if (!frame) {
        /* Too deep */
        if (!ast_true(args.suppress)) {
            ast_log(LOG_ERROR, "Stack peek of '%s' is more stack frames than I have\n", args.n);
        }
        AST_LIST_UNLOCK(oldlist);
        ast_channel_unlock(chan);
        return -1;
    }
 
    args.which = ast_skip_blanks(args.which);
 
    switch (args.which[0]) {
    case 'l': /* label */
        ast_str_set(str, len, "%s,%s,%d", frame->context, frame->extension, frame->priority - 1);
        break;
    case 'c': /* context */
        ast_str_set(str, len, "%s", frame->context);
        break;
    case 'e': /* extension */
        ast_str_set(str, len, "%s", frame->extension);
        break;
    case 'p': /* priority */
        ast_str_set(str, len, "%d", frame->priority - 1);
        break;
    default:
        ast_log(LOG_ERROR, "Unknown argument '%s' to STACK_PEEK\n", args.which);
        break;
    }
 
    AST_LIST_UNLOCK(oldlist);
    ast_channel_unlock(chan);
 
    return 0;
}

References args, AST_APP_ARG, ast_channel_datastore_find(), ast_channel_lock, ast_channel_unlock, AST_DECLARE_APP_ARGS, AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log, ast_skip_blanks(), AST_STANDARD_APP_ARGS, ast_str_set(), ast_strdupa, ast_strlen_zero(), ast_true(), gosub_stack_frame::context, ast_datastore::data, gosub_stack_frame::entries, gosub_stack_frame::extension, len(), LOG_ERROR, NULL, gosub_stack_frame::priority, stack_info, and str.

◆ unload_module()

static int unload_module ( void )

static

Definition at line 1274 of file app_stack.c.

{
    ast_install_stack_functions(NULL);
 
    ast_agi_unregister(&gosub_agi_command);
 
    ast_unregister_application(app_return);
    ast_unregister_application(app_pop);
    ast_unregister_application(app_gosubif);
    ast_unregister_application(app_gosub);
    ast_custom_function_unregister(&local_function);
    ast_custom_function_unregister(&peek_function);
    ast_custom_function_unregister(&stackpeek_function);
 
    return 0;
}

References app_gosub, app_gosubif, app_pop, app_return, ast_agi_unregister(), ast_custom_function_unregister(), ast_install_stack_functions(), ast_unregister_application(), gosub_agi_command, local_function, NULL, peek_function, and stackpeek_function.

Variable Documentation

◆ __mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT | AST_MODFLAG_LOAD_ORDER , .description = "Dialplan subroutines (Gosub, Return, etc)" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND, .optional_modules = "res_agi", }

static

Definition at line 1321 of file app_stack.c.

◆ app_gosub

const char app_gosub[] = "Gosub"

static

Definition at line 230 of file app_stack.c.

Referenced by balance_stack(), gosub_exec(), gosub_run(), handle_gosub(), load_module(), and unload_module().

◆ app_gosubif

const char app_gosubif[] = "GosubIf"

static

Definition at line 231 of file app_stack.c.

Referenced by load_module(), and unload_module().

◆ app_pop

const char app_pop[] = "StackPop"

static

Definition at line 233 of file app_stack.c.

Referenced by load_module(), pop_exec(), and unload_module().

◆ app_return

const char app_return[] = "Return"

static

Definition at line 232 of file app_stack.c.

Referenced by load_module(), and unload_module().

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 1321 of file app_stack.c.

◆ gosub_agi_command

struct agi_command gosub_agi_command

static

Initial value:

=

{ { "gosub", NULL }, handle_gosub, NULL, NULL, 0 }

handle_gosub

static int handle_gosub(struct ast_channel *chan, AGI *agi, int argc, const char *const *argv)

Definition: app_stack.c:1114

Definition at line 1271 of file app_stack.c.

Referenced by load_module(), and unload_module().

◆ local_function

struct ast_custom_function local_function

static

Initial value:

= {
    .name = "LOCAL",
    .write = local_write,
    .read = local_read,
}

Definition at line 781 of file app_stack.c.

Referenced by load_module(), and unload_module().

◆ peek_function

struct ast_custom_function peek_function

static

Initial value:

= {
    .name = "LOCAL_PEEK",
    .read = peek_read,
}

Definition at line 822 of file app_stack.c.

Referenced by load_module(), and unload_module().

◆ stack_info

const struct ast_datastore_info stack_info

static

Initial value:

= {
    .type = "GOSUB",
    .destroy = gosub_free,
}

Definition at line 237 of file app_stack.c.

Referenced by balance_stack(), gosub_exec(), gosub_run(), handle_gosub(), local_read(), local_write(), pop_exec(), return_exec(), and stackpeek_read().

◆ stackpeek_function

struct ast_custom_function stackpeek_function

static

Initial value:

= {
    .name = "STACK_PEEK",
    .read2 = stackpeek_read,
}

Definition at line 912 of file app_stack.c.

Referenced by load_module(), and unload_module().

Data Structures

Functions

Variables

Detailed Description

Function Documentation

◆ __reg_module()

◆ __unreg_module()

◆ AST_MODULE_SELF_SYM()

◆ balance_stack()

◆ expand_gosub_args()

◆ frame_set_var()

◆ gosub_allocate_frame()

◆ gosub_exec()

◆ gosub_free()

◆ gosub_release_frame()

◆ gosub_run()

◆ gosubif_exec()

◆ handle_gosub()

◆ load_module()

◆ local_read()

◆ local_write()

◆ peek_read()

◆ pop_exec()

◆ return_exec()

◆ stackpeek_read()

◆ unload_module()

Variable Documentation

◆ __mod_info

◆ app_gosub

◆ app_gosubif

◆ app_pop

◆ app_return

◆ ast_module_info

◆ gosub_agi_command

◆ local_function

◆ peek_function

◆ stack_info

◆ stackpeek_function