* 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);
Door_CanDispense,
Door_DoDispense
};
-char *gsDoor_Password = "";
-volatile int giDoor_ChildStatus;
+char *gsDoor_SerialPort; // Set from config in main.c
+sem_t gDoor_UnlockSemaphore;
+pthread_t gDoor_LockThread;
+bool gbDoor_LockThreadStarted;
-// == CODE ===
-void Door_SIGCHLDHandler(int signum)
+// === CODE ===
+void* Door_Lock(void* Unused __attribute__((unused)))
{
- signum = 0;
- giDoor_ChildStatus ++;
- printf("SIGCHLD: giDoor_ChildStatus = %i \n", giDoor_ChildStatus);
+ 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);
+ }
}
int Door_InitHandler(void)
{
- signal(SIGCHLD, Door_SIGCHLDHandler);
+ // Thread started later
+
return 0;
}
* \brief Actually do a dispense from the coke machine
*/
int Door_DoDispense(int User, int Item)
-{
- FILE *child_stdin;
- #if 0
- int stdin_pair[2];
- int stdout_pair[2];
- #else
- int child_stdin_fd;
- #endif
- pid_t childPid;
- pid_t parentPid;
-
+{
#if DEBUG
printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
#endif
-
+
// Sanity please
if( Item != 0 ) return -1;
return 1;
}
- giDoor_ChildStatus = 0; // Set child status to zero
- parentPid = getpid();
- childPid = forkpty(&child_stdin_fd, NULL, NULL, NULL);
-
- if( childPid < 0 )
- {
- perror("fork");
- return -1;
- }
-
- // Child process
- if( childPid == 0 )
+ // Door thread spun up here because program is forked after thread created
+ if( !gbDoor_LockThreadStarted )
{
- execl("/usr/bin/llogin", "llogin", "door", "-w-", NULL);
- perror("execl");
- exit(-1);
- }
-
- child_stdin = fdopen(child_stdin_fd, "w");
+ // Initialize semaphore, triggers door lock release if semaphore is greater than 0
+ sem_init(&gDoor_UnlockSemaphore, 0, 0);
- int read_child_output()
- {
- char buf[1024];
- int len;
- if( giDoor_ChildStatus || (len = read(child_stdin_fd, buf, sizeof buf)) < 0)
- {
- #if DEBUG
- printf("Door_DoDispense: fread fail\n");
- #endif
- return -1;
- }
- buf[len] = '\0';
-
- #if DEBUG > 1
- printf("Door_DoDispense: buf = %i '%s'\n", len, buf);
- #endif
- return 0;
- }
-
- if( read_child_output() ) return -1;
-
- // Send password
- if( giDoor_ChildStatus || fputs(gsDoor_Password, child_stdin) <= 0 ) {
- printf("Door_DoDispense: fputs password fail\n");
- return -1;
- }
- fputs("\n", child_stdin);
- fflush(child_stdin);
-
- if( read_child_output() ) return -1;
-
- #if DEBUG
- printf("Door_DoDispense: Door unlock\n");
- #endif
- // ATH1 - Unlock door
- if( giDoor_ChildStatus || fputs("ATH1\n", child_stdin) == 0) {
- #if DEBUG
- printf("Door_DoDispense: fputs unlock failed (or child terminated)\n");
- #endif
- return -1;
+ pthread_create(&gDoor_LockThread, NULL, &Door_Lock, NULL);
}
- fflush(child_stdin);
-
- // Wait before re-locking
- sleep(DOOR_UNLOCKED_DELAY);
- #if DEBUG
- printf("Door_DoDispense: Door re-lock\n");
- #endif
- // Re-lock the door (and quit llogin)
- if( giDoor_ChildStatus || fputs("ATH0\n", child_stdin) == 0 ) {
- fprintf(stderr, "Oh F**k, the door may be stuck unlocked, someone use llogin!\n");
+ if(sem_post(&gDoor_UnlockSemaphore))
+ {
+ perror("Failed to post \"Unlock Door\" semaphore, sem_post returned");
return -1;
}
- fflush(child_stdin);
- fputs("\x1D", child_stdin);
- // Wait a little so llogin can send the lock message
- sleep(1);
-
- fclose(child_stdin);
- close(child_stdin_fd);
-
#if DEBUG
printf("Door_DoDispense: User %i opened door\n", User);
#endif
- kill(childPid, SIGKILL);
-
return 0;
}
-
git.ucc.asn.au / tpg / opendispense2.git / blobdiff
UCC git Repository :: git.ucc.asn.au