* 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 <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
-#if !USE_POPEN
-# include <unistd.h>
-#endif
+#include <unistd.h>
+#include <pty.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <stdbool.h>
-#define DOOR_UNLOCKED_DELAY 10 // 10 seconds before it 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);
-void Door_int_SIGCHLDHandler(int signum);
// === GLOBALS ===
tHandler gDoor_Handler = {
Door_CanDispense,
Door_DoDispense
};
-char *gsDoor_Password = "";
-volatile int giDoor_ChildTerminated;
+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)))
+{
+ 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)
-{
- signal(SIGCHLD, Door_int_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;
- char buf[512];
- #if !USE_POPEN
- int stdin_pair[2];
- int stdout_pair[2];
- pid_t childPid;
- pid_t parent_pid;
- #endif
-
+{
#if DEBUG
printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
#endif
-
+
// Sanity please
if( Item != 0 ) return -1;
return 1;
}
- #if !USE_POPEN
- // Create stdin/stdout
- if( pipe(stdin_pair) || pipe(stdout_pair) )
+ // Door thread spun up here because program is forked after thread created
+ if( !gbDoor_LockThreadStarted )
{
- perror("pipe");
- return -1;
- }
-
- parent_pid = getpid();
- childPid = fork();
-
- if( childPid < 0 )
- {
- perror("fork");
- return -1;
+ // Initialize semaphore, triggers door lock release if semaphore is greater than 0
+ sem_init(&gDoor_UnlockSemaphore, 0, 0);
+
+ pthread_create(&gDoor_LockThread, NULL, &Door_Lock, NULL);
}
-
- // Child process
- if( childPid == 0 )
+
+ if(sem_post(&gDoor_UnlockSemaphore))
{
- // Close write end of stdin, and set it to #0
- close(stdin_pair[1]); dup2(stdin_pair[0], 0);
- // Close read end of stdout, and set it to #1
- close(stdout_pair[0]); dup2(stdout_pair[1], 1);
-
- execl("llogin", "door", "-w-", NULL);
- kill(parent_pid, SIGCHLD);
- perror("execl");
- exit(-1);
- }
-
- child_stdin = fdopen(stdin_pair[1], "w");
- close(stdin_pair[0]); // child stdin read
- close(stdout_pair[1]); // child stdout write
-
- #else
- // llogin or other
- child_stdin = popen("llogin door -w -", "w");
- if( !child_stdin || child_stdin == (void*)-1 ) {
- #if DEBUG
- printf("Door_DoDispense: llogin failure\n");
- #endif
+ perror("Failed to post \"Unlock Door\" semaphore, sem_post returned");
return -1;
}
- #endif
-
- if(fread(buf, 1, 512, child_stdin) == 0) return -1;
-
- // Send password
- if( fputs(gsDoor_Password, child_stdin) <= 0 ) return -1;
- fputs("\n", child_stdin);
-
-
- #if DEBUG
- printf("Door_DoDispense: Door unlock\n");
- #endif
-
- // ATH1 - Unlock door
- if( fputs("ATH1\n", child_stdin) <= 0) return -1;
-
- // Wait before re-locking
- sleep(DOOR_UNLOCKED_DELAY);
-
- #if DEBUG
- printf("Door_DoDispense: Door re-lock\n");
- #endif
-
- // Re-lock the door
- if( fputs("ATH0\n", child_stdin) <= 0 ) return -1;
-
- #if !USE_POPEN
- fclose(child_stdin);
- close(stdin_pair[1]); // child stdin write
- close(stdout_pair[0]); // child stdout read
- #else
- pclose(child_stdin);
- #endif
-
#if DEBUG
printf("Door_DoDispense: User %i opened door\n", User);
#endif
return 0;
}
-
-void Door_int_SIGCHLDHandler(int signum)
-{
- signum = 0; // Snut up
- giDoor_ChildTerminated = 1;
-}
-
git.ucc.asn.au / tpg / opendispense2.git / blobdiff
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