//this function does what's needed for each built-in command. Note: these commands cannot be
//run in the background. Returns 1 if a built-in command is detected, 0 if not
int builtInCmd(char *argList[], struct hist *histList, int count) {
int cdCheck;
int isBuiltIn = 1;
//builtin exit command
if (strcmp(argList[0], "exit") == 0) {
printf("Exiting shell...\n\n");
exit(0);
//builtin cd (change directory) command, implemented with chdir() system call
} else if (strcmp(argList[0], "cd") == 0) {
if ((cdCheck = chdir(argList[1]) == -1)) {
printf("chdir() failure... now exiting shell");
_exit(EXIT_FAILURE);
}
//builtin command to display history
} else if (strcmp(argList[0], "history") == 0) {
printHistory(&histList[0], count);
//builtin command to display currently running jobs
} else if (strcmp(argList[0], "jobs") == 0) {
updateJobs();
printJobs();
//builtin command to bring a background job to the foreground
} else if (strcmp(argList[0], "fg") == 0) {
if (argList[1] == NULL)
printf("Invalid command: must give a Process ID number with the fg command.\n");
if (bringToForeground(argList) == 0)
printf("The process with that PID is not currently running.\n");
} else {
isBuiltIn = 0;
}
return isBuiltIn;
}
//follower method
void CmdLineHandler::sendMsgToLeader()
{
{
HWND hwnd = FindWindowA("PuTTY-ND2_ConfigBox", NULL);
if (hwnd)
{
bringToForeground(hwnd);
return;
}
DWORD wait_result = WaitForSingleObject(sharedMemMutex_, 0);
if (WAIT_OBJECT_0 != wait_result)
{
return;
}
memset(sharedBuffer_, 0, SHARED_MEM_SIZE);
sharedBuffer_[0] = COMMAND_CMD_LINE;
strncpy(sharedBuffer_+1, cmdLine_, SHARED_MEM_SIZE-2);
ReleaseMutex(sharedMemMutex_);
}
}
//Run commands that are built-in shell functions
static void RunBuiltInCmd(commandT* cmd)
{
//Send SIGCONT to a backgrounded job, but do not give it the foreground
if (strncmp(cmd->argv[0], "bg", 2) == 0)
{
//If there are two arguments in the command...
if (cmd->argc == 2)
//Bring the process with the given jobNumber
continueBgJob(strtol(cmd->argv[1],NULL,10));
//If there is one argument in the command...
else if (cmd->argc == 1)
//Bring the most recent background process to the foreground
continueBgJob(-1);
else
{
fprintf(stderr, "Too many arguments were given with bg.\n");
}
}
//Return a backgrounded job to the foreground
else if (strncmp(cmd->argv[0], "fg", 2) == 0)
{
//If there are two arguments in the command...
if (cmd->argc == 2)
//Bring the process with the given jobNumber
bringToForeground(strtol(cmd->argv[1],NULL,10));
//If there is one argument in the command...
else if (cmd->argc == 1)
//Bring the most recent background process to the foreground
bringToForeground(-1);
else
{
fprintf(stderr, "Too many arguments were given with fg.\n");
}
}
//makenew alias
else if (strncmp(cmd->argv[0], "alias", 5) == 0)
{
//If there are two arguments in the command...
if (cmd->argc == 2)
//make new binding
AddAlias(cmd);
//show all bindings
else if (cmd->argc == 1)
PrintAliases();
}
else if (strncmp(cmd->argv[0], "unalias", 7) == 0)
{
RemoveAlias(cmd->argv[1]);
}
else if (strncmp(cmd->argv[0], "cd", 2) == 0)
{
int err;
//If a directory is given, go to that directory
if (cmd->argc == 2)
err = chdir(cmd->argv[1]);
//If a directory isn't given, go to the user's home directory
else
err = chdir(getenv("HOME"));
//If there was a problem changing directories, print an error
if (err == -1)
fprintf(stderr, "%s\n", "Invalid directory\n");
}
//Print the list of background jobs (bgJobsHead)
else if (strncmp(cmd->argv[0], "jobs", 4) == 0){
PrintBgJobList();
}
else
{
fprintf(stderr, "%s is an unrecognized internal command\n", cmd->argv[0]);
fflush(stdout);
}
}
