SIGTTIN explaination added

tshlab/tsh.c

@@ -163,7 +163,12 @@ main(int argc, char **argv)
  Signal(SIGINT, sigint_handler); /* ctrl-c */
  Signal(SIGTSTP, sigtstp_handler); /* ctrl-z */
  Signal(SIGCHLD, sigchld_handler); /* Terminated or stopped child */
- //Signal(SIGTTIN, SIG_IGN);
+
+ /* SIGTTIN shouldn't be ignored, for that when a background process
+ * tries to read from the terminal, it should be stopped and waiting
+ * for being foreground. */
+
+ // Signal(SIGTTIN, SIG_IGN);
  Signal(SIGTTOU, SIG_IGN);
 
  /* This one provides a clean way to kill the shell */
@@ -483,8 +488,9 @@ sigchld_handler(int sig)
  // Should always get here
  if (WIFSTOPPED(status)) {
  job->state = ST;
- printf("Job [%d] (%d) stopped by signal %d\n",
- job->jid, pid, WSTOPSIG(status));
+ if (WSTOPSIG(status) != SIGTTIN)
+ printf("Job [%d] (%d) stopped by signal %d\n",
+ job->jid, pid, WSTOPSIG(status));
  } else if (WIFSIGNALED(status)) {
  printf("Job [%d] (%d) terminated by signal %d\n",
  job->jid, pid, WTERMSIG(status));