/*
* sigchld_handler - The kernel sends a SIGCHLD to the shell whenever
* a child job terminates (becomes a zombie), or stops because it
* received a SIGSTOP or SIGTSTP signal. The handler reaps all
* available zombie children
*/
void
sigchld_handler(int sig)
{
pid_t pid;
int status;
struct job_t *job;
if (verbose)
printf("sigchld_handler: entering\n");
while ((pid = waitpid(-1,&status,WUNTRACED)) > 0){
job = jobs_getjobpid(pid);
if (WIFEXITED(status)){ /*if job exited normally*/
printf("[%d] (%d) Terminated \t\t %s\n",job->jb_jid,pid,job->jb_cmdline);
if(!jobs_deletejob(pid)) /* delete the job */
unix_error("error while deleting job");
} else if (WIFSTOPPED(status)){/*if job received a stop signal*/
job->jb_state = ST; /* change the job state */
printf("[%d] (%d) Suspended \t\t %s\n",job->jb_jid,pid,job->jb_cmdline);
} else if (WIFSIGNALED(status)){/*if job was killed*/
printf("[%d] (%d) Killed \t\t %s\n",job->jb_jid,pid,job->jb_cmdline);
if(!jobs_deletejob(pid)) /* delete the job */
unix_error("error while deleting job");
}
if (verbose)
printf("sigchld_handler: exiting\n");
return;
}
}
/*
* sigchld_handler - The kernel sends a SIGCHLD to the shell whenever
* a child job terminates (becomes a zombie), or stops because it
* received a SIGSTOP or SIGTSTP signal. The handler reaps all
* available zombie children
*/
void sigchld_handler(int sig)
{
struct job_t* job;
int status, pid;
if (verbose) printf("sigchld_handler: entering\n");
if ((pid = waitpid(-1,&status,WNOHANG | WUNTRACED)) == -1)
pid = jobs_fgpid();
if (pid > 0)
{
job = jobs_getjobpid(pid);
if (WIFSTOPPED(status))
{
job->jb_state = ST;
printf("[%d] (%d) : Stopped\n",job->jb_jid,job->jb_pid);
}
else if (WIFEXITED(status))
{
printf("[%d] (%d) : Exited\n",job->jb_jid,job->jb_pid);
jobs_deletejob(pid);
}
else if (WIFSIGNALED(status))
{
printf("[%d] (%d) : Exited by User\n",job->jb_jid,job->jb_pid);
jobs_deletejob(pid);
}
else
{
printf("Error on : [%d] (%d) - %s \n",job->jb_jid,job->jb_pid,job->jb_cmdline);
}
}
if (verbose) printf("sigchld_handler: exiting\n");
return;
}
/* do_kill - Execute the builtin kill command */
void
do_kill(char **argv)
{
struct job_t * job;
pid_t pid;
if (verbose)
printf("do_kill: entering\n");
job = treat_argv(argv);
pid = job->jb_pid;
assert(kill(-pid, SIGKILL) != -1);
if (verbose)
printf("do_kill: sigkill %d \n", pid);
assert(jobs_deletejob(pid) != -1);
if (verbose)
printf("do_stop: exiting\n");
return;
}
