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Annotation of qemu/hw/watchdog.c, revision 1.1.1.2

1.1       root        1: /*
                      2:  * Virtual hardware watchdog.
                      3:  *
                      4:  * Copyright (C) 2009 Red Hat Inc.
                      5:  *
                      6:  * This program is free software; you can redistribute it and/or
                      7:  * modify it under the terms of the GNU General Public License
                      8:  * as published by the Free Software Foundation; either version 2
                      9:  * of the License, or (at your option) any later version.
                     10:  *
                     11:  * This program is distributed in the hope that it will be useful,
                     12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     14:  * GNU General Public License for more details.
                     15:  *
                     16:  * You should have received a copy of the GNU General Public License
                     17:  * along with this program; if not, see <http://www.gnu.org/licenses/>.
                     18:  *
                     19:  * By Richard W.M. Jones ([email protected]).
                     20:  */
                     21: 
                     22: #include "qemu-common.h"
1.1.1.2 ! root       23: #include "qemu-option.h"
        !            24: #include "qemu-config.h"
        !            25: #include "qemu-queue.h"
1.1       root       26: #include "sysemu.h"
                     27: #include "hw/watchdog.h"
                     28: 
1.1.1.2 ! root       29: /* Possible values for action parameter. */
        !            30: #define WDT_RESET        1     /* Hard reset. */
        !            31: #define WDT_SHUTDOWN     2     /* Shutdown. */
        !            32: #define WDT_POWEROFF     3     /* Quit. */
        !            33: #define WDT_PAUSE        4     /* Pause. */
        !            34: #define WDT_DEBUG        5     /* Prints a message and continues running. */
        !            35: #define WDT_NONE         6     /* Do nothing. */
        !            36: 
        !            37: static int watchdog_action = WDT_RESET;
        !            38: static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
1.1       root       39: 
                     40: void watchdog_add_model(WatchdogTimerModel *model)
                     41: {
1.1.1.2 ! root       42:     QLIST_INSERT_HEAD(&watchdog_list, model, entry);
1.1       root       43: }
                     44: 
                     45: /* Returns:
                     46:  *   0 = continue
                     47:  *   1 = exit program with error
                     48:  *   2 = exit program without error
                     49:  */
                     50: int select_watchdog(const char *p)
                     51: {
                     52:     WatchdogTimerModel *model;
1.1.1.2 ! root       53:     QemuOpts *opts;
1.1       root       54: 
                     55:     /* -watchdog ? lists available devices and exits cleanly. */
                     56:     if (strcmp(p, "?") == 0) {
1.1.1.2 ! root       57:         QLIST_FOREACH(model, &watchdog_list, entry) {
1.1       root       58:             fprintf(stderr, "\t%s\t%s\n",
                     59:                      model->wdt_name, model->wdt_description);
                     60:         }
                     61:         return 2;
                     62:     }
                     63: 
1.1.1.2 ! root       64:     QLIST_FOREACH(model, &watchdog_list, entry) {
1.1       root       65:         if (strcasecmp(model->wdt_name, p) == 0) {
1.1.1.2 ! root       66:             /* add the device */
        !            67:             opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
        !            68:             qemu_opt_set(opts, "driver", p);
1.1       root       69:             return 0;
                     70:         }
                     71:     }
                     72: 
                     73:     fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
1.1.1.2 ! root       74:     QLIST_FOREACH(model, &watchdog_list, entry) {
1.1       root       75:         fprintf(stderr, "\t%s\t%s\n",
                     76:                  model->wdt_name, model->wdt_description);
                     77:     }
                     78:     return 1;
                     79: }
                     80: 
                     81: int select_watchdog_action(const char *p)
                     82: {
                     83:     if (strcasecmp(p, "reset") == 0)
                     84:         watchdog_action = WDT_RESET;
                     85:     else if (strcasecmp(p, "shutdown") == 0)
                     86:         watchdog_action = WDT_SHUTDOWN;
                     87:     else if (strcasecmp(p, "poweroff") == 0)
                     88:         watchdog_action = WDT_POWEROFF;
                     89:     else if (strcasecmp(p, "pause") == 0)
                     90:         watchdog_action = WDT_PAUSE;
                     91:     else if (strcasecmp(p, "debug") == 0)
                     92:         watchdog_action = WDT_DEBUG;
                     93:     else if (strcasecmp(p, "none") == 0)
                     94:         watchdog_action = WDT_NONE;
                     95:     else
                     96:         return -1;
                     97: 
                     98:     return 0;
                     99: }
                    100: 
                    101: /* This actually performs the "action" once a watchdog has expired,
                    102:  * ie. reboot, shutdown, exit, etc.
                    103:  */
                    104: void watchdog_perform_action(void)
                    105: {
                    106:     switch(watchdog_action) {
                    107:     case WDT_RESET:             /* same as 'system_reset' in monitor */
                    108:         qemu_system_reset_request();
                    109:         break;
                    110: 
                    111:     case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */
                    112:         qemu_system_powerdown_request();
                    113:         break;
                    114: 
                    115:     case WDT_POWEROFF:          /* same as 'quit' command in monitor */
                    116:         exit(0);
                    117:         break;
                    118: 
                    119:     case WDT_PAUSE:             /* same as 'stop' command in monitor */
                    120:         vm_stop(0);
                    121:         break;
                    122: 
                    123:     case WDT_DEBUG:
                    124:         fprintf(stderr, "watchdog: timer fired\n");
                    125:         break;
                    126: 
                    127:     case WDT_NONE:
                    128:         break;
                    129:     }
                    130: }

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