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/******************************************************************************
** Filename: sigmenu.c
** Purpose: General purpose, menu-oriented signal handling routines
** Author: Dan Johnson
** History: Mon Oct 2 07:25:50 1989, DSJ, Created.
**
** (c) Copyright Hewlett-Packard Company, 1988.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
******************************************************************************/
/**----------------------------------------------------------------------------
Include Files and Type Defines
----------------------------------------------------------------------------**/
#include "sigmenu.h"
#include "oldlist.h"
#include "emalloc.h"
#include "secname.h"
#include <signal.h>
#include <stdio.h>
#include <string.h>
#define MAX_COMMAND_LENGTH 128
typedef struct
{
int ItemNum;
char *ItemLabel;
int_void ItemFunc;
} SIG_MENU_ITEM;
/**----------------------------------------------------------------------------
Global Data Definitions and Declarations
----------------------------------------------------------------------------**/
static LIST SignalMenus[NSIG]; /* must be initialized to NIL */
/**----------------------------------------------------------------------------
Private Function Prototypes
----------------------------------------------------------------------------**/
void MainSignalHandler(int Signal);
SIG_MENU_ITEM *NewSignalMenuItem (int ItemNum,
const char ItemLabel[], int_void ItemFunc);
int ItemCompare(void *arg1, //SIG_MENU_ITEM *Item1,
void *arg2); //SIG_MENU_ITEM *Item2);
/**----------------------------------------------------------------------------
Public Code
----------------------------------------------------------------------------**/
/*---------------------------------------------------------------------------*/
void
AddSignalMenuItem (int Signal,
int ItemNum, const char ItemLabel[], int_void ItemFunc) {
/*
** Parameters:
** Signal signal to be trapped for this menu
** ItemNum menu number for this item
** ItemLabel menu label for this item
** ItemFunc function to be called when item is selected
** Globals:
** SignalMenus list of menu items for each possible signal
** Operation:
** Add a new menu item to the list of menu items for Signal.
** Whenever Signal is encountered, the user will be given
** a list of options to choose from. This list is the list
** of all of the menu items that have been specified for that
** Signal.
** Return: none
** Exceptions: none
** History: Mon Oct 2 07:42:19 1989, DSJ, Created.
*/
#if 0
#ifndef SECURE_NAMES
SIG_MENU_ITEM *NewItem;
/* check for a valid Signal */
if (Signal >= NSIG || Signal <= 0) {
cprintf ("Illegal signal (%d) specified for menu item!\n", Signal);
return;
}
/* if this is the first item for this signal, indicate that the
appropriate signal handler has been enabled */
if (SignalMenus[Signal] == NIL)
cprintf ("Signal handler enabled for signal %d.\n", Signal);
/* add the new menu item to the appropriate list of menu items */
NewItem = NewSignalMenuItem (ItemNum, ItemLabel, ItemFunc);
SignalMenus[Signal] = s_adjoin (SignalMenus[Signal], NewItem, ItemCompare);
/* set up the trap for the appropriate signal */
signal(Signal, MainSignalHandler);
#endif
#endif
} /* AddSignalMenuItem */
/**----------------------------------------------------------------------------
Private Code
----------------------------------------------------------------------------**/
/*---------------------------------------------------------------------------*/
void MainSignalHandler(int Signal) {
/*
** Parameters:
** Signal signal that caused this function to be called
** Globals:
** SignalMenus list of menu items for each possible signal
** Operation: Provide the user with a menu of actions for the trapped
** signal. Execute the appropriate function. If the function
** returns SIG_RESUME, then terminate the signal handler and
** resume normal processing. If the function does not return
** SIG_RESUME, remain in the main signal handler menu.
** Return: none
** Exceptions: none
** History: Mon Oct 2 08:18:52 1989, DSJ, Created.
*/
#ifndef SECURE_NAMES
int Command;
char CommandLine[MAX_COMMAND_LENGTH];
char *Params;
LIST Items;
SIG_MENU_ITEM *MenuItem;
while (TRUE) {
Command = -1;
cprintf ("\nMAIN SIGNAL HANDLER FOR SIGNAL %d\n", Signal);
cprintf ("0. Resume normal operation\n");
Items = SignalMenus[Signal];
iterate(Items) {
MenuItem = (SIG_MENU_ITEM *) first_node (Items);
cprintf ("%d. %s\n", MenuItem->ItemNum, MenuItem->ItemLabel);
}
cprintf ("\nEnter Selection: ");
while (fgets (CommandLine, MAX_COMMAND_LENGTH, stdin) == NULL
|| strlen (CommandLine) <= 0);
Command = strtol (CommandLine, &Params, 10);
if (CommandLine == Params) {
cprintf ("\nIllegal command! - Try again.\n");
continue;
}
if (Command == 0)
signal(Signal, MainSignalHandler);
Items = SignalMenus[Signal];
iterate(Items) {
MenuItem = (SIG_MENU_ITEM *) first_node (Items);
if (Command == MenuItem->ItemNum) {
if ((*MenuItem->ItemFunc) ( /*Params */ ) == SIG_RESUME)
signal(Signal, MainSignalHandler);
break;
}
}
if (Items == NIL)
cprintf ("\nIllegal command! - Try again.\n");
}
#endif
} /* MainSignalHandler */
/*---------------------------------------------------------------------------*/
SIG_MENU_ITEM *
NewSignalMenuItem (int ItemNum, const char ItemLabel[], int_void ItemFunc) {
/*
** Parameters:
** ItemNum menu number for this item
** ItemLabel menu label for this item
** ItemFunc function to be called when item is selected
** Globals: none
** Operation: Allocate, initialize, and return a new signal menu item.
** Return: Ptr to new signal menu item data structure.
** Exceptions: none
** History: Mon Oct 2 08:04:20 1989, DSJ, Created.
*/
SIG_MENU_ITEM *NewItem;
NewItem = (SIG_MENU_ITEM *) Emalloc (sizeof (SIG_MENU_ITEM));
NewItem->ItemNum = ItemNum;
NewItem->ItemFunc = ItemFunc;
NewItem->ItemLabel = (char *) Emalloc (strlen (ItemLabel) + 1);
strcpy (NewItem->ItemLabel, ItemLabel);
return (NewItem);
} /* NewSignalMenuItem */
/*---------------------------------------------------------------------------*/
int ItemCompare(void *arg1, //SIG_MENU_ITEM *Item1,
void *arg2) { //SIG_MENU_ITEM *Item2)
/*
** Parameters:
** Item1, Item2 two menu items to be compared
** Globals: none
** Operation: Return -1 if the ItemNum of Item1 is less than the
** ItemNum of Item2. Return 0 if they are equal. Return +1
** if the ItemNum of Item1 is greater than the ItemNum of
** Item2. This routine is used by the list sorter to sort
** lists of menu items according to their item number.
** Return: -1, 0, or 1
** Exceptions: none
** History: Mon Oct 2 08:11:59 1989, DSJ, Created.
*/
SIG_MENU_ITEM *Item1 = (SIG_MENU_ITEM *) arg1;
SIG_MENU_ITEM *Item2 = (SIG_MENU_ITEM *) arg2;
if (Item1->ItemNum < Item2->ItemNum)
return (-1);
else if (Item1->ItemNum == Item2->ItemNum)
return (0);
else if (Item1->ItemNum > Item2->ItemNum)
return (1);
else
return 0;
} /* ItemCompare */
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