/* Continue job with specifed pgid in the background. Control stays with terminal*/
void resume_background_job(pid_t pgid) {
job_t* j = find_job(pgid); //ID the stopped job
j->bg = true; //If it was in foreground, now in background
process_t* p;
for (p = j->first_process; p; p = p->next) {
if (p->stopped) { //resume all stopped processes in its process group
p->stopped = false;
p->status = -1;
}
}
continue_job(j); //sends SIGCONT signal to job
}
void builtin_bg(struct job* job) {
process* proc = &job->procs[0];
struct job* target = find_stopped(proc->argc, proc->argv);
/* Continue job */
if (!target || !continue_job(target)) {
print_error("SIGCONT");
} else {
/* set as background and notify resume */
target->background = true;
printf("[%d] continued\n", target->pgid);
}
}
void builtin_fg(struct job* job) {
process* proc = &job->procs[0];
struct job* target = find_stopped(proc->argc, proc->argv);
/* Continue job */
if (!target || !continue_job(target)) {
print_error("SIGCONT");
} else {
/* set as foreground and wait */
target->background = false;
wait_foreground_job(target);
}
}
/* Continue job with specifed pgid in the foreground */
void resume_foreground_job(pid_t pgid) {
job_t* j = find_job(pgid); //obtain job with specified processs group ID
j->bg = false; //if was in background before, it is no longer
process_t* p;
for (p = j->first_process; p; p = p->next) {
if (p->stopped) { //ID stopped processes in specified job and resume them
p->stopped = false;
p->status = -1;
}
}
tcsetpgrp(shell_terminal, j->pgid); //move the job to the terminal foreground
continue_job(j); //send SIGCONT signal
wait_on_job(j); //suspend dsh until job exits or stops
tcsetpgrp(shell_terminal, shell_pgid); //when foregroung job exits or stops, return control to dsh
}
/*
* builtin_cmd - If the user has typed a built-in command then execute
* it immediately.
*/
bool builtin_cmd(job_t *last_job, int argc, char **argv)
{
/* check whether the cmd is a built in command
*/
if (!strcmp("quit", argv[0])) {
/* Your code here */
exit(EXIT_SUCCESS);
}
else if (!strcmp("jobs", argv[0])) {
/* Your code here */
job_t* currentJob = active_jobs_head;
job_t* deletedJob = NULL;
while(currentJob != NULL) {
// print active jobs and then change notified to 0
//if((currentJob->first_process)->completed == true && currentJob->notified == false) {
//need to check if every process has completed for a job to be complete, not just the first process
if (job_is_completed(currentJob) == true)
{
printf("%d (Completed): %s\n", currentJob->pgid, currentJob->commandinfo);
deletedJob = currentJob;
//currentJob->notified = true;
}
//otherwise it is stopped
else if (job_is_stopped(currentJob) == true)
{
printf("%d (Stopped): %s\n", currentJob->pgid, currentJob->commandinfo);
}
else
{
printf("%d (Running): %s\n", currentJob->pgid, currentJob->commandinfo);
}
currentJob = currentJob->next;
// delete job after it is completed, don't need to save notified
if (deletedJob != NULL)
{
if (deletedJob == active_jobs_head)
{
active_jobs_head = deletedJob->next;
free_job(deletedJob); //TBD warning about this?
}
else
{
delete_job(deletedJob, active_jobs_head);
}
deletedJob = NULL;
}
}
return true;
}
else if (!strcmp("cd", argv[0])) {
int chdir_return = chdir(argv[1]);
if(chdir_return == -1) {
printf("cd: %s: No such file or directory\n", argv[1]);
}
return true;
}
else if (!strcmp("bg", argv[0])) {
/* Your code here */
job_t* currentJob = active_jobs_head;
process_t* p2;
if(argv[1] == NULL)
{
// continue most recent stopped job
//use find_last_job
currentJob = find_last_job(active_jobs_head);
continue_job(currentJob);
seize_tty(currentJob->pgid);
p2 = currentJob->first_process;
while(p2 != NULL)
{
p2->stopped = false;
struct sigaction action;
action.sa_sigaction = sighandler;
sigfillset(&action.sa_mask);
action.sa_flags = SA_SIGINFO;
sigaction(SIGCHLD, &action, NULL);
p2 = p2->next;
}
seize_tty(getpid());
}
else
{
pid_t job_number = atoi(argv[1]);
while(currentJob != NULL) {
// Need to eventually iterate through all processes?
if((job_is_stopped(currentJob)) && currentJob->pgid == job_number) {
//seize_tty(currentJob->pgid);
continue_job(currentJob);
seize_tty(currentJob->pgid);
p2 = currentJob->first_process;
while (p2 != NULL)
{
p2->stopped = false;
struct sigaction action;
action.sa_sigaction = sighandler;
sigfillset(&action.sa_mask);
action.sa_flags = SA_SIGINFO;
sigaction(SIGCHLD, &action, NULL);
p2 = p2->next;
}
seize_tty(getpid());
break;
}
else if (currentJob->pgid == job_number) {
printf("%s\n", "This process wasn't stopped`");
}
else {
printf("%s\n", "This job number is not the requested one");
}
currentJob = currentJob->next;
}
}
return true;
}
else if (!strcmp("fg", argv[0])) {
/* Your code here */
job_t* currentJob = active_jobs_head;
process_t* p2;
if(argv[1] == NULL) {
// continue most recent stopped job
//use find_last_job
currentJob = find_last_job(active_jobs_head);
continue_job(currentJob);
seize_tty(currentJob->pgid);
p2 = currentJob->first_process;
while(p2 != NULL)
{
waiting(p2);
p2 = p2->next;
}
seize_tty(getpid());
}
else {
pid_t job_number = atoi(argv[1]);
while(currentJob != NULL) {
if((job_is_stopped(currentJob)) && currentJob->pgid == job_number) {
//seize_tty(currentJob->pgid);
continue_job(currentJob);
seize_tty(currentJob->pgid);
p2 = currentJob->first_process;
while (p2 != NULL)
{
waiting(p2);
p2 = p2->next;
}
seize_tty(getpid());
break;
}
else if (currentJob->pgid == job_number) {
printf("%s\n", "This process wasn't stopped`");
}
else {
printf("%s\n", "This job number is not the requested one");
}
currentJob = currentJob->next;
}
}
return true;
}
/* not a builtin command */
return false;
}