Door_DoDispense
};
char *gsDoor_Password = "";
+volatile int giDoor_ChildStatus;
// == CODE ===
+void Door_SIGCHLDHandler(int signum)
+{
+ signum = 0;
+ giDoor_ChildStatus ++;
+ printf("SIGCHLD: giDoor_ChildStatus = %i \n", giDoor_ChildStatus);
+}
+
int Door_InitHandler(void)
-{
+{
+ signal(SIGCHLD, Door_SIGCHLDHandler);
return 0;
}
int stdin_pair[2];
int stdout_pair[2];
pid_t childPid;
+ pid_t parentPid;
#if DEBUG
printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
return -1;
}
+ giDoor_ChildStatus = 0; // Set child status to zero
+ parentPid = getpid();
childPid = fork();
if( childPid < 0 )
close(stdin_pair[0]); // child stdin read
close(stdout_pair[1]); // child stdout write
- if(read(stdout_pair[1], buf, 512) < 0) {
+ {
+ int len;
+ if( giDoor_ChildStatus || (len = read(stdout_pair[0], buf, 512)) < 0)
+ {
+ #if DEBUG
+ printf("Door_DoDispense: fread fail\n");
+ #endif
+ return -1;
+ }
+ buf[len] = '\0';
+
#if DEBUG
- printf("Door_DoDispense: fread fail\n");
+ printf("Door_DoDispense: buf = %i '%s'\n", len, buf);
#endif
- return -1;
}
// Send password
- if( fputs(gsDoor_Password, child_stdin) <= 0 ) {
+ if( giDoor_ChildStatus || fputs(gsDoor_Password, child_stdin) <= 0 ) {
#if DEBUG
printf("Door_DoDispense: fputs password\n");
#endif
#endif
// ATH1 - Unlock door
- if( fputs("ATH1\n", child_stdin) <= 0) {
+ if( giDoor_ChildStatus || fputs("ATH1\n", child_stdin) <= 0) {
#if DEBUG
printf("Door_DoDispense: fputs unlock\n");
#endif
#endif
// Re-lock the door
- if( fputs("ATH0\n", child_stdin) <= 0 ) {
+ if( giDoor_ChildStatus || fputs("ATH0\n", child_stdin) == 0 ) {
#if DEBUG
printf("Door_DoDispense: fputs lock\n");
#endif
printf("Door_DoDispense: User %i opened door\n", User);
#endif
+ kill(childPid, SIGKILL);
+
return 0;
}