* OpenDispense 2
* UCC (University [of WA] Computer Club) Electronic Accounting System
*
- * handler_doror.c - Door Relay code
+ * handler_door.c - Door Relay code
*
* This file is licenced under the 3-clause BSD Licence. See the file
* COPYING for full details.
*/
#define DEBUG 1
-#define USE_POPEN 0
#include "common.h"
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
-#include <sys/wait.h>
#include <pty.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <stdbool.h>
-#define DOOR_UNLOCKED_DELAY 5 // Time in seconds before the door re-locks
+#define DOOR_UNLOCKED_DELAY 10 // Time in seconds before the door re-locks
// === IMPORTS ===
// === PROTOTYPES ===
+void* Door_Lock(void* Unused);
int Door_InitHandler();
int Door_CanDispense(int User, int Item);
int Door_DoDispense(int User, int Item);
- int writes(int fd, const char *str);
// === GLOBALS ===
tHandler gDoor_Handler = {
Door_CanDispense,
Door_DoDispense
};
-char *gsDoor_SerialPort = "/dev/ttyS3";
+char *gsDoor_SerialPort; // Set from config in main.c
+sem_t gDoor_UnlockSemaphore;
+pthread_t gDoor_LockThread;
+bool gbDoor_LockThreadStarted;
+
+// === CODE ===
+void* Door_Lock(void* Unused __attribute__((unused)))
+{
+ gbDoor_LockThreadStarted = true;
+ while(1)
+ {
+ sem_wait(&gDoor_UnlockSemaphore);
+
+ int door_serial_handle = InitSerial(gsDoor_SerialPort, 9600);
+ if(door_serial_handle < 0)
+ {
+ fprintf(stderr, "Unable to open door serial '%s'\n", gsDoor_SerialPort);
+ perror("Opening door port");
+ }
+
+ // Disable local echo
+ {
+ struct termios info;
+ tcgetattr(door_serial_handle, &info);
+ info.c_cflag &= ~CLOCAL;
+ tcsetattr(door_serial_handle, TCSANOW, &info);
+ }
+
+ if(write(door_serial_handle, "\xff\x01\x01", 3) != 3) // Relay ON
+ {
+ fprintf(stderr, "Failed to write Relay ON (unlock) command, errstr: %s", strerror(errno));
+ }
+
+ sleep(DOOR_UNLOCKED_DELAY);
+
+ if(write(door_serial_handle, "\xff\x01\x00", 3) != 3) // Relay OFF
+ {
+ fprintf(stderr, "Failed to write Relay OFF (lock) command, errstr: %s", strerror(errno));
+ }
+
+ close(door_serial_handle);
+ }
+}
-// == CODE ===
int Door_InitHandler(void)
{
+ // Thread started later
+
return 0;
}
// Sanity please
if( Item != 0 ) return -1;
- if( !(Bank_GetFlags(User) & USER_FLAG_DOORGROUP) )
+ if( !(Bank_GetFlags(User) & (USER_FLAG_DOORGROUP|USER_FLAG_ADMIN)) )
{
#if DEBUG
printf("Door_CanDispense: User %i not in door\n", User);
* \brief Actually do a dispense from the coke machine
*/
int Door_DoDispense(int User, int Item)
-{
- int door_serial_handle;
-
+{
#if DEBUG
printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
#endif
-
+
// Sanity please
if( Item != 0 ) return -1;
// Check if user is in door
- if( !(Bank_GetFlags(User) & USER_FLAG_DOORGROUP) )
+ if( !(Bank_GetFlags(User) & (USER_FLAG_DOORGROUP|USER_FLAG_ADMIN)) )
{
#if DEBUG
printf("Door_CanDispense: User %i not in door\n", User);
return 1;
}
- door_serial_handle = InitSerial(gsDoor_SerialPort, 1200);
- if(door_serial_handle < 0) {
- fprintf(stderr, "Unable to open door serial '%s'\n", gsDoor_SerialPort);
- perror("Opening door port");
- return -1;
- }
-
+ // Door thread spun up here because program is forked after thread created
+ if( !gbDoor_LockThreadStarted )
{
- struct termios info;
- tcgetattr(door_serial_handle, &info);
- info.c_iflag &= ~IGNCR; // Ignore \r
- tcsetattr(door_serial_handle, TCSANOW, &info);
- }
+ // Initialize semaphore, triggers door lock release if semaphore is greater than 0
+ sem_init(&gDoor_UnlockSemaphore, 0, 0);
- if( writes(door_serial_handle, "\r\nATH1\r\n") ) {
- fprintf(stderr, "Unable to open door (sending ATH1)\n");
- perror("Sending ATH1");
- return -1;
+ pthread_create(&gDoor_LockThread, NULL, &Door_Lock, NULL);
}
-
- // Wait before re-locking
- sleep(DOOR_UNLOCKED_DELAY);
- if( writes(door_serial_handle, "\r\nATH0\r\n") ) {
- fprintf(stderr, "Oh, hell! Door not re-locking, big error (sending ATH0 failed)\n");
- perror("Sending ATH0");
+ if(sem_post(&gDoor_UnlockSemaphore))
+ {
+ perror("Failed to post \"Unlock Door\" semaphore, sem_post returned");
return -1;
}
- close(door_serial_handle);
-
#if DEBUG
printf("Door_DoDispense: User %i opened door\n", User);
#endif
return 0;
}
-
-int writes(int fd, const char *str)
-{
- int len = strlen(str);
-
- if( len != write(fd, str, len) )
- {
- return 1;
- }
- return 0;
-}
-