void signalHandler_child(int p)
{
pid_t pid;
int terminationStatus;
pid = waitpid(WAIT_ANY, &terminationStatus, WUNTRACED | WNOHANG);
if (pid > 0) {
t_job* job = getJob(pid, BY_PROCESS_ID);
if (job == NULL)
return;
if (WIFEXITED(terminationStatus)) {
if (job->status == BACKGROUND) {
printf("\n[%d]+ Done\t %s\n", job->id, job->name);
jobsList = delJob(job);
//shellPrompt();
//printf("myShell> ");
}
} else if (WIFSIGNALED(terminationStatus)) {
printf("\n[%d]+ KILLED\t %s\n", job->id, job->name);
jobsList = delJob(job);
//shellPrompt();
//printf("myShell> ");
} else if (WIFSTOPPED(terminationStatus)) {
if (job->status == BACKGROUND) {
tcsetpgrp(MSH_TERMINAL, MSH_PGID);
changeJobStatus(pid, WAITING_INPUT);
printf("\n[%d]+ suspended [wants input]\t %s\n",
numActiveJobs, job->name);
//shellPrompt();
//printf("myShell> ");
} else {
tcsetpgrp(MSH_TERMINAL, job->pgid);
changeJobStatus(pid, SUSPENDED);
printf("\n[%d]+ stopped\t %s\n", numActiveJobs, job->name);
//shellPrompt();
//printf("myShell> ");
}
return;
} else {
if (job->status == BACKGROUND) {
jobsList = delJob(job);
}
}
tcsetpgrp(MSH_TERMINAL, MSH_PGID);
}
}
void waitJob(t_job* job)
{
int terminationStatus;
while (waitpid(job->pid, &terminationStatus, WNOHANG) == 0) {
if (job->status == SUSPENDED)
return;
}
jobsList = delJob(job);
}
/**
* waits for a job, blocking unless it has been suspended.
* Deletes the job after it has been executed
*/
void waitJob(t_job* job)
{
int terminationStatus;
while (waitpid(job->pid, &terminationStatus, WNOHANG) == 0) { // while there are child to be waited
if (job->status == SUSPENDED) // exit if the job has been set to be stopped
return;
}
jobsList = delJob(job); // delete the job
}
/**
* signal handler for SIGCHLD
*/
void signalHandler_child(int p)
{
pid_t pid;
int terminationStatus;
pid = waitpid(WAIT_ANY, &terminationStatus, WUNTRACED | WNOHANG); // intercept the process that sends the signal
if (pid > 0) { // if there are information about it
t_job* job = getJob(pid, BY_PROCESS_ID); // get the job from the list
if (job == NULL)
return;
if (WIFEXITED(terminationStatus)) { // case the process exits normally
if (job->status == BACKGROUND) { // child in background terminates normally
printf("\n[%d]+ Done\t %s\n", job->id, job->name); // inform the user
jobsList = delJob(job); // delete it from the list
}
} else if (WIFSIGNALED(terminationStatus)) { // the job dies because of a signal
printf("\n[%d]+ KILLED\t %s\n", job->id, job->name); // inform the user
jobsList = delJob(job); // delete the job from the list
} else if (WIFSTOPPED(terminationStatus)) { // a job receives a SIGSTP signal
if (job->status == BACKGROUND) { // the job is in bg
tcsetpgrp(RSH_TERMINAL, RSH_PGID);
changeJobStatus(pid, WAITING_INPUT); // change its status to "waiting for input"
printf("\n[%d]+ suspended [wants input]\t %s\n",
numActiveJobs, job->name); // inform the user
} else { // otherwise, the job is going to be suspended
tcsetpgrp(RSH_TERMINAL, job->pgid);
changeJobStatus(pid, SUSPENDED); // we modify the status
printf("\n[%d]+ stopped\t %s\n", numActiveJobs, job->name); // and inform the user
}
return;
} else {
if (job->status == BACKGROUND) { // otherwise, delete the job from the list
jobsList = delJob(job);
}
}
tcsetpgrp(RSH_TERMINAL, RSH_PGID);
}
}
